CN115742510A - Release film - Google Patents
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- CN115742510A CN115742510A CN202211589790.2A CN202211589790A CN115742510A CN 115742510 A CN115742510 A CN 115742510A CN 202211589790 A CN202211589790 A CN 202211589790A CN 115742510 A CN115742510 A CN 115742510A
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Abstract
The invention relates to the technical field of release films, in particular to a release film which comprises an upper surface layer, a middle layer and a lower surface layer, wherein the middle layer comprises poly (4-methyl-1 pentene), poly (alpha-olefin), polyurethane, a cross-linking agent and a compatilizer, and the middle layer takes the polyurethane as a framework and forms a net structure through the reaction with the cross-linking agent. The release film provided by the invention has excellent easy-stripping property and attaching property; in addition, the release film provided by the invention does not need coating, is environment-friendly and has a simple process.
Description
Technical Field
The invention relates to the technical field of functional films, in particular to a preparation method of a release film for a multi-layer circuit board laminating process.
Background
In the process of manufacturing a Flexible Printed Circuit (FPC), a plurality of films or sheets need to be pressed together by heating and pressing. (1) In order to prevent the metal plate from being stuck to the film or the sheet during the high-temperature and high-pressure lamination process, a release film is generally used between the metal plate and the object to be laminated. (2) There are cases where the circuit surface of the FPC fluctuates. (3) In order to connect the FPC to other electrical components, the connection portion needs to be exposed in advance. The adhesive used in the pressing process melts during the high temperature and pressure process and easily flows to the exposed portion.
In order to satisfy the requirement of (1), the bonding force between the metal plate and the FPC is made small. Common solutions are to use paper, PET, PBT surface coated with fluorine or silicon based release agents on the outer surface or to use low surface tension materials such as PTFE (polytetrafluoroethylene), tetrafluoroethylene-hexafluoropropylene copolymers, polyolefins modified with fluorine based materials, polymethylpentene or copolymers. Currently, most commercialized or most patented are release films manufactured using TPX (4-methyl-1-pentene polymer) produced in mitsui japan as a main raw material.
In order to satisfy the requirement of (2), the release film has good shape adherence at the pressing temperature, and can be tightly attached to the surface of the FPC even in uneven places.
In order to meet the requirement of (3), a common solution for the release film to have good adhesive resistance (i.e. the release film enters the exposed holes to prevent the adhesive from flowing to the exposed joints during the pressing process) is to use a soft material for the core layer or the layer connected to the outer surface layer. CN101479327A uses polyolefin with Vicat softening point of 50-150 deg.C: polyalphaolefins, EMA, EMMA, EAA, EMAA; CN109466124A core layer uses PMMA, PE and other soft materials; CN108235594A adopts an ABCBA five-layer structure, and the B layer adopts one of EMMA/EMA/EVA and TPX, PE and PP; CN108215370A and CN108221477A adopt ABC three-layer structure, and layer B uses combination of EMMA, PE and PP; CN112622312A adopts an ABC three-layer structure, a layer B is used, an intermediate functional layer comprises at least one soft resin with the melting point lower than 180 ℃ and a soft material with the content of 20-70 wt%, and the soft resin is a polymer formed by polymerizing at least one olefin selected from ethylene, propylene, butylene, pentene, hexene and methylpentene.
CN101479327A and CN112622312A disclose release films respectively, in the product design process, in order to achieve the following property to the concave-convex surface of the printed circuit board and have excellent buffer property, the core layer uses a large amount of polyolefin soft resin with the melting point lower than 180 ℃ or the vicat softening point of 50-150 ℃, which may cause the phenomenon that the raw material of the core layer of the release film leaks from the edge of the release film after melting in the lamination process of using high temperature and high pressure (temperature 180 ℃ and pressure 14 MPa) in the multi-layer FPC composite, so as to pollute the lamination equipment and affect the process efficiency.
According to the invention, through adjustment of the core layer formula, the probability of fusion leakage of the core layer raw material in the high-temperature and high-pressure process is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the release film which has excellent easy-peeling property and fitting property; in addition, the release film provided by the invention does not need coating, is environment-friendly and has a simple process.
Technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention provides a release film, which comprises an upper surface layer, a middle layer and a lower surface layer, wherein the middle layer comprises poly-4-methyl-1-pentene, poly-alpha-olefin, polyurethane, a cross-linking agent and a compatilizer, and the middle layer takes the polyurethane as a framework and forms a net structure through the reaction with the cross-linking agent.
Further, the upper surface layer and the lower surface layer are both composed of at least one material of poly-4-methyl-1 pentene, 4-methyl-1 pentene and alpha-olefin copolymer, alpha-olefin homo-polymer or copolymer.
Further, the precursor of the hard segment of the polyurethane comprises at least one or more of toluene diisocyanate, diphenyl diisocyanate, naphthalene diisocyanate, methylene diphenyl diisocyanate, xylylene diisocyanate and oligomers thereof.
Further, the soft segment precursor of the polyurethane comprises at least one or more of polyethylene glycol adipate, polybutylene adipate, polycaprolactone diol, polycarbonate diol, acrylic polyol ester and polybutadiene polyol ester.
Further, the polyurethane is an aromatic polyurethane.
Further, the density of the polyurethane is 0.6-2.0 g/cm 3 The relative molecular weight is 1000-1000000, the melt index is 0.1-100 g/10min (the test condition is 190 ℃ and 2.16 kg), the Shore hardness is 05A-90D, and the elastic modulus is 10-1000 Mpa.
Further, the cross-linking agent adopts at least one or more of polyisocyanates, polyamines, polyols, polyglycidyl ethers and polyoxiranes;
the compatilizer comprises at least one of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-acrylic acid copolymer, hydrogenated styrene-ethylene/butylene-styrene block copolymer, thermoplastic polyester elastomer, maleic anhydride grafted polyolefin and alpha-olefin copolymer of ethylene and eight or more carbons.
Further, the upper surface layer and the lower surface layer are both composed of at least one material of poly-4-methyl-1-pentene (75% -100%), 4-methyl-1-pentene and alpha-olefin copolymer (0-25%), alpha-olefin homopolymerization or copolymer (0-25%) according to mass fraction.
Further, the middle layer comprises 20-70% of poly 4-methyl-1-pentene, 10-60% of poly alpha-olefin, 5-40% of polyurethane, 0.1-10% of compatilizer and 0.01-10% of cross-linking agent by mass fraction.
A production process of a release film comprises the steps of raw material particle dedusting, raw material particle weighing, mixing and conveying, extruder melt extrusion, three-layer co-extrusion distributor confluence, slit flat die head extrusion, cooling roller cooling molding, rim charge cutting, online thickness measurement, CCD defect detection and rolling.
For the upper and lower surface layers, the material is extruded by a single screw, the temperature of the feeding section is set between 150 ℃ and 220 ℃, and the temperature of the plasticizing section and the metering section is set between 240 ℃ and 290 ℃. For the intermediate layer, the material is extruded by a double screw, the temperature of the conveying section is set between 40 and 150 ℃, and the temperature of the melting and plasticizing section is set between 160 and 260 ℃. The temperature of the dispenser and the slit flat die is set between 220 ℃ and 290 ℃, wherein the set temperature of the slit flat die is 5-20 ℃ lower than the set temperature of the dispenser. And in the stage of cooling and forming the release film, three independent cooling rollers are provided, the set temperature of the independent cooling rollers is 30-70 ℃, and the set temperature of the second cooling roller and the third cooling roller is the same and is 5-20 ℃ lower than the set temperature of the first cooling roller. In order to sufficiently cool the release film, a negative pressure adsorption and electrostatic edge fixing device is additionally arranged between the slit flat die head and the first cooling roller, so that the release film is sufficiently attached to the surface of the first cooling roller. The power of the negative pressure adsorption device is set between 20 and 60 percent. The voltage of the electrostatic edge fixing device is between 5 and 18 KV. The X-ray thickness gauge is linked with the automatic slit flat die head, the gap of the die opening of the slit flat die head is automatically adjusted on line according to the measured thickness of the product, and the average error of the thickness of the product is controlled within 2 percent. In addition, the tension and pressure of the rolling are adjusted according to the thickness and the production speed of the product and controlled within 100N/m.
Advantageous effects
Compared with the known public technology, the technical scheme provided by the invention has the following beneficial effects:
1. according to the invention, the middle layer polyurethane is chemically crosslinked to form a net structure, so that the raw material of the core layer of the release film is effectively prevented from leaking from the edge of the release film after being melted in the lamination process of the multi-layer FPC under high temperature and high pressure (temperature 180 ℃ and pressure 12 MPa), the risk of polluting lamination equipment is reduced, and the processing efficiency is improved. Meanwhile, the good flexibility of the polyurethane can endow the release film with good glue resistance.
2. The release film provided by the invention has excellent easy-peeling property and bonding property; in addition, the release film provided by the invention does not need coating, is environment-friendly and has a simple process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic view of a release film according to the present invention;
FIG. 2 is a flow chart of a process for preparing the release film according to the present invention;
upper surface layer 1, intermediate layer 2, lower surface layer 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
A release film comprises an upper surface layer 1, an intermediate layer 2 and a lower surface layer 3, wherein the intermediate layer 2 comprises poly-4-methyl-1-pentene, poly-alpha-olefin, polyurethane, a cross-linking agent and a compatilizer, and the intermediate layer 2 takes the polyurethane as a framework and forms a net structure through reaction with the cross-linking agent.
The upper surface layer 1 and the lower surface layer 3 are both composed of at least one material of poly-4-methyl-1-pentene, 4-methyl-1-pentene and alpha-olefin copolymer, alpha-olefin homo-polymer or copolymer.
The precursor of the hard chain segment of the polyurethane comprises at least one or more of toluene diisocyanate, diphenyl diisocyanate, naphthalene diisocyanate, methylene diphenyl diisocyanate, xylylene diisocyanate and oligomers thereof.
The soft segment precursor of the polyurethane comprises at least one or more of polyethylene glycol adipate, polybutylene adipate, polycaprolactone diol, polycarbonate diol, acrylic polyol ester and polybutadiene polyol ester.
The polyurethane is aromatic polyurethane.
The density of the polyurethane is 0.6-2.0 g/cm 3 The relative molecular weight is 1000-1000000, the melt index is 0.1-100 g/10min (the test condition is 190 ℃ and 2.16 kg), the Shore hardness is 05A-90D, and the elastic modulus is 10-1000 Mpa.
The cross-linking agent is at least one or more of polyisocyanates, polyamines, polyols, polyglycidyl ethers and polyoxoethane;
the compatilizer comprises at least one or more of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-acrylic acid copolymer, hydrogenated styrene-ethylene/butylene-styrene block copolymer, thermoplastic polyester elastomer, maleic anhydride grafted polyolefin, and ethylene and alpha-olefin copolymer with eight or more carbon atoms.
According to the mass fraction, the upper surface layer 1 and the lower surface layer 3 are respectively composed of 75-100% of at least one material of poly 4-methyl-1-pentene, 0-25% of 4-methyl-1-pentene and alpha-olefin copolymer, and 0-25% of alpha-olefin homo-or copolymer.
The middle layer 2 comprises 20-70% of poly 4-methyl-1-pentene, 10-60% of poly alpha-olefin, 5-40% of polyurethane, 0.1-10% of compatilizer and 0.01-10% of cross-linking agent by mass fraction.
A production process of a release film comprises the steps of raw material particle dedusting, raw material particle weighing, mixing and conveying, extruder melt extrusion, three-layer co-extrusion distributor confluence, slit flat die head extrusion, cooling roller cooling molding, rim charge cutting, online thickness measurement, CCD defect detection and rolling.
For the upper and lower surface layers, the material is extruded by a single screw, the temperature of the feeding section is set between 150 ℃ and 220 ℃, and the temperature of the plasticizing section and the metering section is set between 240 ℃ and 290 ℃. For the intermediate layer, the material is extruded by using a double screw, the temperature of the conveying section is set to be between 40 and 150 ℃, and the temperature of the melting and plasticizing section is set to be between 160 and 260 ℃. The temperature of the dispenser and the slit flat die is set between 220 ℃ and 290 ℃, wherein the set temperature of the slit flat die is 5-20 ℃ lower than the set temperature of the dispenser. And in the stage of cooling and forming the release film, three independent cooling rollers are provided, the set temperature of the independent cooling rollers is 30-70 ℃, and the set temperature of the second cooling roller and the third cooling roller is the same and is 5-20 ℃ lower than the set temperature of the first cooling roller. In order to sufficiently cool the release film, a negative pressure adsorption and electrostatic edge fixing device is additionally arranged between the slit flat die head and the first cooling roller, so that the release film is sufficiently attached to the surface of the first cooling roller. The power of the negative pressure adsorption device is set between 20 and 60 percent. The voltage of the electrostatic edge fixing device is between 5 and 18 KV. The X-ray thickness gauge is linked with the automatic slit flat die head, the gap of the die opening of the slit flat die head is automatically adjusted on line according to the measured thickness of the product, and the average error of the thickness of the product is controlled within 2 percent. In addition, the tension and pressure of the rolling are adjusted according to the thickness and the production speed of the product and controlled within 100N/m.
(I) preparation of Release film
Example 1:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 20 mass percent of polyurethane, 10 mass percent of polyethylene-vinyl acetate copolymer, 54.45 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 0.05 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Example 2:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 20 mass percent of polyurethane, 10 mass percent of polyethylene-vinyl acetate copolymer, 54.4 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 0.1 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Example 3:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 20 mass percent of polyurethane, 10 mass percent of polyethylene-vinyl acetate copolymer, 54.2 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 0.3 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Example 4:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 20 mass percent of polyurethane, 10 mass percent of polyethylene-vinyl acetate copolymer, 54 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 0.5 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Example 5:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15% of poly-4-methyl-1-pentene, 20% of polyurethane, 10% of polyethylene-vinyl acetate copolymer, 53.5% of polypropylene, 0.5% of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 1% of 1, 5-naphthalene diisocyanate in percentage by mass. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Comparative example 1:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly 4-methyl-1-pentene, 20 mass percent of polyurethane, 10 mass percent of polyethylene-vinyl acetate copolymer, 54.5 mass percent of polypropylene and 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Comparative example 2:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 10 mass percent of polyethylene-vinyl acetate copolymer, 73.5 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 1 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Comparative example 3:
the upper and lower surface layer formulas are poly 4-methyl-1-pentene with the mass fraction of 100%; the formula of the middle layer comprises 15 mass percent of poly-4-methyl-1-pentene, 10 mass percent of polyethylene-vinyl acetate copolymer, 74 mass percent of polypropylene, 0.5 mass percent of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and 0.5 mass percent of 1, 5-naphthalene diisocyanate. The total thickness is 150um, and the layer ratio of the upper layer, the middle layer and the lower layer is 1.
Among them, in examples 1 to 5 and comparative examples 1 to 3:
poly-4-methyl-1-pentene, RT18, selected for use in mitsui chemistry;
polyurethane, selected from 60DT3 produced by Luborun;
polyethylene-vinyl acetate copolymer selected from EVA 2518 produced by Korea Dadall;
polypropylene, selected from CF330 produced by Korea Dadall;
pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] selected from the antioxidant 1010 produced by basf;
1, 5-naphthalene diisocyanate, choosen in Shun chemical.
In addition, the preparation process flows of the release films of the examples 1 to 5 and the comparative examples 1 to 3 are the same, and are as follows:
dedusting of raw material particles, weighing, mixing and conveying of raw material particles, melt extrusion of an extruder, confluence of a three-layer co-extrusion distributor, extrusion of a slit flat die head, cooling and forming of a cooling roller, cutting of rim charge, online thickness measurement, CCD defect detection and winding. (FIG. 2)
For the upper and lower skin layers, the material was extruded in a single screw extruder with a feed zone temperature set at 200 ℃ and plasticizing and metering zones at 260 ℃. For the intermediate layer, the material was extruded using twin screw extrusion with the temperature of the conveying section set at 90 ℃ and the temperature of the melt plastifying section set at 200 ℃. The temperature of the dispenser was set at 250 ℃ and the temperature of the slot die was set at 240 ℃.
And in the stage of cooling and forming the release film, three independent cooling rollers are provided, the set temperature of the first cooling roller is 60 ℃, the set temperatures of the second cooling roller and the third cooling roller are the same, and the set temperature is 45 ℃.
In order to sufficiently cool the release film, a negative pressure adsorption and electrostatic edge fixing device is additionally arranged between the slit flat die head and the first cooling roller, so that the release film is sufficiently attached to the surface of the first cooling roller. The power of the negative pressure adsorption device was set at 40%. The voltage of the electrostatic edge fixing device is between 12 KV. The X-ray thickness gauge is linked with the automatic slit flat die head, the gap of the die opening of the slit flat die head is automatically adjusted on line according to the measured thickness of the product, and the average error of the thickness of the product is controlled within 2 percent. In addition, the tension and pressure of the rolling are adjusted according to the thickness and the production speed of the product and controlled within 100N/m.
(II) Release film Performance test
The performance test method of the release film comprises the following steps:
1. release property: the release film, the protective film and the flexible circuit board are reasonably and smoothly stacked, and after lamination under the conditions of 14Mpa at 180 ℃, prepressing for 10s and laminating for 140s, the release film can be easily peeled from the surface of the flexible circuit board, and the flexible circuit board is qualified if the flexible circuit board is not damaged.
2. Glue overflow property: laminating the release film, the protective film and the flexible circuit board reasonably and smoothly, laminating under the conditions of 14Mpa at 180 ℃, prepressing for 10s and laminating for 140s, observing the end face of the laminated release film by using a microscope, and determining that the extruded length of the middle layer is less than 1 mm.
3. Glue resistance: and (3) laminating the release film, the protective film and the flexible circuit board reasonably and smoothly, after laminating under the conditions of 14Mpa at 180 ℃, prepressing for 10s and laminating for 140s, tearing off the release film, and observing by using a microscope that the size of glue overflowing from the intersection of the protective film edge at the reserved hole of the laminated flexible circuit board and the terminal interface at the reserved hole is less than 0.1mm, namely the laminated flexible circuit board is qualified.
4. Thermal shrinkage rate: a square sample wafer with the thickness of 100mmX100mm is taken and placed in an oven with the temperature of 180 ℃ for 30 min, the sample wafer is taken out and cooled to the room temperature, and the size of the sample wafer in the MD direction is tested.
| Release property | Resistance to blocking | Bleeding property | MD shrinkage (%) | |
| Example 1 | Qualified | Qualified | Fail to be qualified | 1.1 |
| Example 2 | Qualified | Qualified | Qualified | 0.8 |
| Example 3 | Qualified | Qualified | Qualified | 0.2 |
| Example 4 | Qualified | Qualified | Qualified | 0.2 |
| Example 5 | Qualified | Qualified | Qualified | 0.2 |
| Comparative example 1 | Qualified | Qualified | Fail to be qualified | 2.8 |
| Comparative example 2 | Qualified | Fail to be qualified | Fail to be qualified | 2.0 |
| Comparative example 3 | Qualified | Fail to be qualified | Fail to be qualified | 2.0 |
As can be seen from the test results in the table above, 1, 5-naphthalene diisocyanate and polyurethane have a great influence on the performance of the release film, wherein as can be seen from examples 1-5 and comparative example 1, when the mass fraction of 1, 5-naphthalene diisocyanate is between 0-0.05%, the bleeding is not qualified; as is clear from examples 1 to 5 and comparative examples 2 to 3, when no polyurethane was added, neither the blocking property nor the bleeding property was satisfactory.
Therefore, the invention forms the reticular structure by chemically crosslinking the middle layer polyurethane, can effectively prevent the raw material of the core layer of the release film from leaking from the edge of the release film after being melted in the lamination process of the composite use of the multi-layer FPC at high temperature and high pressure (temperature 180 ℃ and pressure 12 MPa), reduces the risk of polluting the lamination equipment and improves the process efficiency. Meanwhile, the good flexibility of the polyurethane can endow the release film with good glue resistance.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The release film is characterized by comprising an upper surface layer, a middle layer and a lower surface layer, wherein the middle layer comprises poly-4-methyl-1-pentene, poly-alpha-olefin, polyurethane, a cross-linking agent and a compatilizer, and the middle layer takes the polyurethane as a framework and forms a net structure through reaction with the cross-linking agent.
2. The release film according to claim 1, wherein the upper surface layer and the lower surface layer are each composed of at least one material selected from poly-4-methyl-1-pentene, a copolymer of 4-methyl-1-pentene and α -olefin, and a homo-or copolymer of α -olefin.
3. The release film according to claim 1, wherein the hard segment precursor of the polyurethane comprises at least one or more of toluene diisocyanate, diphenyl diisocyanate, naphthalene diisocyanate, methylene diphenyl diisocyanate, xylylene diisocyanate, and oligomers thereof.
4. The release film according to claim 1, wherein the soft segment precursor of the polyurethane comprises at least one or more of polyethylene glycol adipate, polybutylene adipate, polycaprolactone diol, polycarbonate diol, polyol acrylate, and polyol polybutadiene.
5. The release film according to claim 1, wherein the polyurethane is an aromatic polyurethane.
6. The release film according to claim 1, wherein the polyurethane has a density of 0.6-2.0 g/cm 3 The relative molecular mass is 1000-1000000, the melt index is 0.1-100 g/10min, the Shore hardness is 05A-90D, and the elastic modulus is 10-1000 Mpa.
7. The release film according to claim 1, wherein the cross-linking agent is at least one or more of polyisocyanates, polyamines, polyols, polyglycidyl ethers, and polyoxyethanes;
the compatilizer comprises at least one or more of ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-acrylic acid copolymer, hydrogenated styrene-ethylene/butylene-styrene block copolymer, thermoplastic polyester elastomer, maleic anhydride grafted polyolefin, and ethylene and alpha-olefin copolymer with eight or more carbon atoms.
8. The release film according to claim 1, wherein the upper surface layer and the lower surface layer are composed of 75-100% of poly-4-methyl-1-pentene, 0-25% of copolymer of 4-methyl-1-pentene and alpha-olefin, and 0-25% of at least one of homo-or copolymer of alpha-olefin.
9. The release film according to claim 1, wherein the intermediate layer comprises 20-70% of poly-4-methyl-1-pentene, 10-60% of poly-alpha-olefin, 5-40% of polyurethane, 0.1-10% of compatibilizer, and 0.01-10% of cross-linking agent by mass fraction.
10. The process for preparing a release film according to claim 1, wherein the preparation steps comprise raw material particle dedusting, raw material particle weighing, mixing and conveying, extruder melt extrusion, three-layer co-extrusion distributor confluence, slit flat die head extrusion, cooling roller cooling and forming, rim charge cutting, online thickness measurement, CCD defect detection and rolling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211589790.2A CN115742510A (en) | 2022-12-11 | 2022-12-11 | Release film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211589790.2A CN115742510A (en) | 2022-12-11 | 2022-12-11 | Release film |
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| Publication Number | Publication Date |
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| CN115742510A true CN115742510A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211589790.2A Pending CN115742510A (en) | 2022-12-11 | 2022-12-11 | Release film |
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| CN (1) | CN115742510A (en) |
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- 2022-12-11 CN CN202211589790.2A patent/CN115742510A/en active Pending
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