CN115972731A - PBT release film and preparation method and application thereof - Google Patents
PBT release film and preparation method and application thereof Download PDFInfo
- Publication number
- CN115972731A CN115972731A CN202310258577.1A CN202310258577A CN115972731A CN 115972731 A CN115972731 A CN 115972731A CN 202310258577 A CN202310258577 A CN 202310258577A CN 115972731 A CN115972731 A CN 115972731A
- Authority
- CN
- China
- Prior art keywords
- surface layer
- pbt
- layer
- release film
- thickness
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000010410 layer Substances 0.000 claims abstract description 114
- 239000002344 surface layer Substances 0.000 claims abstract description 105
- 239000002994 raw material Substances 0.000 claims abstract description 59
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000002245 particle Substances 0.000 claims abstract description 34
- 238000004519 manufacturing process Methods 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 25
- 239000003963 antioxidant agent Substances 0.000 claims description 21
- 238000001125 extrusion Methods 0.000 claims description 20
- 230000003078 antioxidant effect Effects 0.000 claims description 19
- 230000003746 surface roughness Effects 0.000 claims description 19
- 239000012745 toughening agent Substances 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 9
- 239000012752 auxiliary agent Substances 0.000 claims description 8
- 239000007779 soft material Substances 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 6
- 229920006245 ethylene-butyl acrylate Polymers 0.000 claims description 6
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims description 6
- 238000005469 granulation Methods 0.000 claims description 6
- 230000003179 granulation Effects 0.000 claims description 6
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- QYMGIIIPAFAFRX-UHFFFAOYSA-N butyl prop-2-enoate;ethene Chemical compound C=C.CCCCOC(=O)C=C QYMGIIIPAFAFRX-UHFFFAOYSA-N 0.000 claims description 4
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 239000012528 membrane Substances 0.000 abstract description 13
- 229920001707 polybutylene terephthalate Polymers 0.000 description 83
- 230000000052 comparative effect Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000005453 pelletization Methods 0.000 description 3
- -1 polybutylene terephthalate Polymers 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000002671 adjuvant Substances 0.000 description 2
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000005042 ethylene-ethyl acrylate Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002530 phenolic antioxidant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PBT release film and a preparation method and application thereof, belonging to the technical field of release film materials. The PBT release film comprises a first surface layer, a middle layer and a second surface layer; the total thickness of the first surface layer, the middle layer and the second surface layer is 110-130 μm, the thickness of the first surface layer is 20-25 μm, and the thickness of the second surface layer is 4-7 μm; the raw materials for preparing the first surface layer and the second surface layer are pure PBT, and the raw material for preparing the middle layer is modified PBT. This asymmetric three-layer PBT leaves type membrane, on conventional PBT leaves the membrane gross thickness basis of type membrane for one side top layer thickness satisfies and leaves the type, and another top layer thickness reduces, and improves the thickness in intermediate layer, can increase from the type nature, can increase again and hinder gluey nature, and makes the raw materials particle obtain rational utilization, can greatly reduce manufacturing enterprise self and low reaches customer's cost. It can be used for preparing flexible circuit board.
Description
Technical Field
The invention relates to the technical field of release film materials, and particularly relates to a PBT release film and a preparation method and application thereof.
Background
A flexible circuit board, also called a "flexible board", that is, an FPC, is a printed circuit made of a flexible insulating base material, which can provide excellent electrical properties, meet the design requirements of more compact and higher density mounting, and at the same time, contribute to reduction of assembly processes and enhancement of reliability, and can greatly reduce the volume and weight of electronic products, and is of great significance in the progress of development of electronic products toward high density, miniaturization, and high reliability.
In the preparation of FPC, in order to prevent the metal wiring from being oxidized and corroded by air, moisture and other substances, which affects the electrical properties of the metal wiring, it is usually necessary to cover one side of the printed circuit with a protective film. The protective film is bonded to the surface of the printed circuit by thermocompression bonding, and if the bonding is directly performed, the covered protective film is easily bonded to the surface of the heating plate. Therefore, the surface of the protective film needs to be covered with a release film, so that the protective film can be prevented from being adhered, and defects such as glue blocking and wrinkles in the pressing process can be reduced.
Because the surface tension of TPX (poly-4-methyl-1-pentene) is extremely small, TPX particles are often selected as release film materials for FPC (flexible circuit board) boards in the market at present, but the TPX particles are monopolized by Mitsui corporation of Japan and have higher price, and the release film is used as an indispensable product in the circuit board market, so that the search for products capable of replacing the TPX release film is more and more important.
At present, PBT (polybutylene terephthalate) is used as a raw material to produce the release film on the market, but the production cost is higher and the economic benefit is poorer.
In view of this, the invention is particularly proposed.
Disclosure of Invention
One of the purposes of the invention is to provide a PBT release film, which can reasonably utilize raw material particles on the premise of simultaneously having good release property and glue resistance, and can greatly reduce the cost of production enterprises and downstream customers.
The second purpose of the invention is to provide a preparation method of the PBT release film.
The invention also aims to provide application of the PBT release film.
The application can be realized as follows:
in a first aspect, the application provides a PBT release film, which includes a first surface layer, an intermediate layer, and a second surface layer, wherein the first surface layer and the second surface layer are respectively located on the surfaces of two opposite sides of the intermediate layer;
the total thickness of the first surface layer, the middle layer and the second surface layer is 110-130 μm, the thickness of the first surface layer is 20-25 μm, and the thickness of the second surface layer is 4-7 μm;
the raw materials for preparing the first surface layer and the second surface layer are pure PBT, and the raw material for preparing the middle layer is modified PBT.
In an alternative embodiment, the thickness of the intermediate layer is 100-110 μm.
In an alternative embodiment, the surface roughness of the first surface layer is Rz ≧ 16 μm and the surface roughness of the second surface layer is Rz ≦ 8 μm.
In an alternative embodiment, the modified PBT is obtained by co-extruding and granulating PBT raw material particles and an auxiliary agent.
In an alternative embodiment, the adjuvants include a toughening agent, a low temperature softening material, a PP graft material, and an antioxidant.
In an alternative embodiment, 10-20 parts of toughening agent, 30-50 parts of low-temperature soft material, 10-20 parts of PP graft material and 1-5 parts of antioxidant are used per 100 parts of PBT raw material particles by mass.
In an alternative embodiment, the extrusion granulation comprises: and melting and co-extruding the PBT raw material particles and the auxiliary agent in a double-screw extruder to obtain material strips, and then pelletizing.
In an alternative embodiment, the melting temperature is 210-250 ℃.
In an optional embodiment, drying the material after the dicing is further included.
In an alternative embodiment, the drying is vacuum drying at 100-140 deg.C for 3-5h.
In an alternative embodiment, the toughening agent includes at least one of an ethylene-butyl acrylate copolymer and an ethylene-ethyl acrylate copolymer.
In an alternative embodiment, the low temperature soft material comprises EMMA.
In an alternative embodiment, the PP graft comprises a maleic anhydride PP graft.
In an alternative embodiment, the antioxidant comprises a combination of hindered phenolic antioxidants and phosphite antioxidants.
In a second aspect, the present application provides a method for preparing a PBT release film according to any of the preceding embodiments, comprising the steps of: and carrying out three-layer co-extrusion casting on the raw material of the first surface layer, the raw material of the middle layer and the raw material of the second surface layer.
In an alternative embodiment, the rotation speed of the main machine A for extruding the raw material of the first surface layer is 12-20rpm, and the processing temperature is 235-280 ℃; and/or the rotating speed of a host B for extruding the middle layer is 28-40rpm, and the processing temperature is 235-255 ℃; and/or the rotating speed of a main machine C for extruding the second surface layer is 4-8rpm, and the processing temperature is 235-280 ℃; and/or the die temperature is 270-280 ℃.
In a third aspect, the present application provides the use of a PBT release film as in any of the preceding embodiments for the preparation of flexible circuit boards.
The beneficial effect of this application includes:
this application is through setting up asymmetric three-layer PBT from the type membrane, on conventional PBT is from the membrane gross thickness basis of type membrane for one side top layer thickness satisfies from the type, and another top layer thickness reduces, and improves the thickness in intermediate level, and this mode can increase from the type nature, can increase again and hinder gluey nature, and makes the raw materials particle obtain rational utilization, can greatly reduce manufacturing enterprise self and low reaches customer's cost. The PBT release film can be used for preparing a flexible circuit board, so that the bonding of a protective film is effectively avoided, and the defects in the pressing process are reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic cross-sectional structure of a PBT release film in the prior art;
fig. 2 is a schematic cross-sectional structure diagram of the PBT release film of the application.
Icon: 1-a first skin layer; 2-an intermediate layer; 3-second surface layer.
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. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The PBT release film provided by the application and the preparation method and application thereof are specifically explained below.
The inventor proposes that the reason why the production cost of the release film by taking PBT (polybutylene terephthalate) as a raw material in the market is higher and the economic benefit is poorer is mainly that: PBT (polybutylene terephthalate) is the raw materials production release film, basically all be first top layer 1, the three-layer of intermediate level 2 and second top layer 3 is crowded structure altogether (ABA type), the thickness on first top layer 1 is the same with second top layer 3 (as shown in figure 1), only one side can contact the FPC board from the type film, be used for the pressfitting to make, the another side only contacts the used film of equipment or other pressfitting processes, so surface layer thickness does on satisfying from the type performance basis as thick, can cause the waste of raw materials particle.
Based on this, please refer to fig. 2, the present application provides a PBT release film, which includes a first surface layer 1, an intermediate layer 2, and a second surface layer 3, wherein the first surface layer 1 and the second surface layer 3 are respectively located on two opposite surfaces of the intermediate layer 2.
The total thickness of the first skin layer 1, the intermediate layer 2 and the second skin layer 3 is 110-130 μm, such as 110 μm, 112 μm, 115 μm, 118 μm, 120 μm, 122 μm, 125 μm, 128 μm or 130 μm, and may be any other value within the range of 110-130 μm.
The thickness of the first surface layer 1 is 20 to 25 μm, such as 20 μm, 20.5 μm, 21 μm, 21.5 μm, 22 μm, 22.5 μm, 23 μm, 23.5 μm, 24 μm, 24.5 μm, 25 μm, etc., and may be any other value within the range of 20 to 25 μm.
The thickness of the second skin layer 3 is 4-7 μm, such as 4 μm, 4.5 μm, 5 μm, 5.5 μm, 6 μm, 6.5 μm, or 7 μm, and may be any other value within the range of 4-7 μm.
Accordingly, the thickness of the intermediate layer 2 is the total thickness of the three layers minus the thickness of the first skin layer 1 and the thickness of the second skin layer 3.
In some preferred embodiments, the thickness of the intermediate layer 2 is 100-110 μm, such as 100 μm, 111 μm, 112 μm, 113 μm, 114 μm, 115 μm, 116 μm, 117 μm, 118 μm, 119 μm, 120 μm, etc., but may also be any other value in the range of 100-110 μm.
It should be noted that if the thickness of the intermediate layer 2 is less than 100 μm, the adhesive resistance of the whole PBT release film will be reduced, which is not beneficial for use in the process of manufacturing flexible circuit boards. If the thickness of the intermediate layer 2 is greater than 110 μm, on one hand, the cost is increased, and on the other hand, the thickness of the whole PBT release film exceeds 130 μm, which not only increases the cost, but also is not beneficial for use in the process of manufacturing flexible circuit boards.
The raw materials for preparing the first surface layer 1 and the second surface layer 3 are pure PBT, and the raw material for preparing the middle layer 2 is modified PBT.
Preferably, the surface roughness of the first surface layer 1 is not less than 16 μm in Rz, and the surface roughness of the second surface layer 3 is not less than 5 and not more than 8 μm in Rz. Correspondingly, the first surface layer 1 is used as a using surface and mainly used for providing release property; the second surface serves as a face for a contact device or other bonding process.
If the surface roughness of the first surface layer 1 is less than 16 μm, it is easy to make it difficult to distinguish the first surface layer 1 from the second surface layer 3 by naked eyes; if the surface roughness of the second surface is less than 5 μm, it is too smooth, resulting in easy slipping of the film when placed on an FPC board, and if the surface roughness of the second surface is more than 8 μm, it is easy to cause difficulty in distinguishing the first surface layer 1 and the second surface layer 3 with the naked eye.
Bear, this application is through setting up asymmetric three-layer PBT from the type membrane, on the membrane gross thickness basis of type membrane is left from type membrane to conventional PBT for one side top layer thickness satisfies from the type, and another top layer thickness reduces, and improves the thickness of intermediate level 2, and this mode can increase from the type nature, can increase again and hinder gluey nature, and makes the raw materials particle obtain rational utilization, can greatly reduce manufacturing enterprise self and low reaches customer's cost. The PBT release film can be used for preparing a flexible circuit board, so that the bonding of a protective film is effectively avoided, and the defects in the pressing process are reduced.
In the application, the modified PBT is mainly obtained by extruding and granulating PBT raw material particles and an auxiliary agent together.
By way of reference, the auxiliaries may include, for example, tougheners, low-temperature softeners, PP grafts and antioxidants. In other embodiments, the adjuvant may further include other substances as desired, and is not limited herein.
Wherein, the toughening agent can comprise at least one of ethylene-butyl acrylate copolymer and ethylene-ethyl acrylate copolymer.
The ethylene-butyl acrylate copolymer may be EBA and the ethylene-ethyl acrylate copolymer may be EEA, TPU or TPE.
The low temperature soft goods include EMMA, which is available from Sumitomo corporation.
The PP grafting material comprises maleic anhydride PP grafting material.
The antioxidant comprises a compound antioxidant of hindered phenol antioxidant and phosphite antioxidant.
It should be noted that, the above-mentioned auxiliary agents may also adopt other conventional substances of the type that are available, and are not specifically listed or overly limited herein.
In the bearing, the toughening agent is mainly used for improving the toughness of the middle layer 2, so that the middle layer cannot be crushed in the hot pressing process; the low-temperature soft material and the PP grafting material are mainly used for improving the glue resistance of the middle layer 2; the antioxidant is mainly used to improve the oxidation resistance of the intermediate layer 2. The intermediate layer 2 with high adhesive resistance can be prepared from the modified PBT particles jointly modified by the aid.
For reference, 10-20 parts of toughening agent, 30-50 parts of low-temperature soft material, 10-20 parts of PP graft material and 1-5 parts of antioxidant can be correspondingly used per 100 parts of PBT raw material particles by mass parts.
Specifically, the amount of the toughening agent to be used may be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, or the like, or any other amount within the range of 10 to 20 parts, per 100 parts of the PBT raw material particles.
The mass of the low-temperature soft material used per 100 parts of the PBT raw material particles may be 30 parts, 32 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, 50 parts, or the like, or may be any other value within a range of 30 to 50 parts.
The mass of the PP graft used per 100 parts of PBT raw material particles may be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, or the like, or may be any other value within the range of 10 to 20 parts.
The antioxidant may be used in an amount of 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or the like by mass per 100 parts of the PBT raw material particles, or may be any other value within a range of 1 to 5 parts.
In the preparation of the intermediate layer 2, the extrusion granulation may include: and melting and co-extruding the PBT raw material particles and the auxiliary agent in a double-screw extruder to obtain material strips, and then pelletizing.
The melting temperature may be 210-250 deg.C, such as 210 deg.C, 215 deg.C, 220 deg.C, 225 deg.C, 230 deg.C, 235 deg.C, 240 deg.C, 245 deg.C or 250 deg.C, or may be any other value within the range of 210-250 deg.C.
Further, drying the materials after pelletizing.
For reference, the drying can be performed under vacuum at 100-140 deg.C (e.g., 100 deg.C, 105 deg.C, 110 deg.C, 115 deg.C, 120 deg.C, 125 deg.C, 130 deg.C, 135 deg.C or 140 deg.C, etc.) for 3-5h (e.g., 3h, 3.5h, 4h, 4.5h or 5h, etc.).
In addition, the application also provides a preparation method of the PBT release film, which comprises the following steps: and carrying out three-layer co-extrusion casting on the raw material of the first surface layer 1, the raw material of the middle layer 2 and the raw material of the second surface layer 3.
Wherein the rotation speed of the main machine A for extruding the raw material of the first surface layer 1 is set to be 12-20rpm, and the processing temperature is 235-280 ℃.
Specifically, the rotation speed of the main body a may be 12rpm, 12.5 rpm, 13 rpm, 13.5 rpm, 14 rpm, 14.5 rpm, 15rpm, 15.5 rpm, 16 rpm, 16.5 rpm, 17 rpm, 17.5 rpm, 18 rpm, 18.5 rpm, 19 rpm, 19.5 rpm, 20rpm, or the like, or may be any other value within a range of 12 to 20 rpm.
The processing temperature of the main machine A may be 235 deg.C, 240 deg.C, 245 deg.C, 250 deg.C, 255 deg.C, 260 deg.C, 265 deg.C, 270 deg.C, 275 deg.C or 280 deg.C, etc., or may be any other value within the range of 235-280 deg.C.
The rotation speed of the main body B for extruding the middle layer 2 is 28-40rpm, and the processing temperature is 235-255 ℃.
Specifically, the rotation speed of the main body B may be 28rpm, 28.5 rpm, 29rpm, 29.5 rpm, 30rpm, 31.5 rpm, 32 rpm, 32.5 rpm, 33 rpm, 33.5 rpm, 34rpm, 34.5 rpm, 35rpm, 35.5 rpm, 36 rpm, 36.5 rpm, 37rpm, 37.5rpm, 38rpm, 38.5rpm, 39rpm, 39.5rpm, 40rpm, or the like, or may be any other value within the range of 28 to 40 rpm.
The processing temperature of the host B may be 235 ℃, 238 ℃, 240 ℃, 242 ℃, 245 ℃, 248 ℃, 250 ℃, 252 ℃ or 255 ℃ or any other value within the range of 235-255 ℃.
The rotation speed of the main machine C for extruding the second skin layer 3 is 4-8rpm, and the processing temperature is 235-280 ℃.
Specifically, the rotation speed of the main body C may be 4rpm, 4.5 rpm, 5rpm, 5.5 rpm, 6rpm, 6.5 rpm, 7rpm, 7.5rpm, 8rpm, or the like, or may be any other value within the range of 4 to 8 rpm.
The processing temperature of the host C may be 235 deg.C, 240 deg.C, 245 deg.C, 250 deg.C, 255 deg.C, 260 deg.C, 265 deg.C, 270 deg.C, 271 deg.C, 272 deg.C, 273 deg.C, 274 deg.C, 275 deg.C, 276 deg.C, 277 deg.C, 278 deg.C, 279 deg.C, or 280 deg.C, or may be any other value within the range of 235-280 deg.C.
The die temperature is 270-280 deg.C, such as 270 deg.C, 271 deg.C, 272 deg.C, 273 deg.C, 274 deg.C, 275 deg.C, 276 deg.C, 277 deg.C, 278 deg.C, 279 deg.C or 280 deg.C, and may be any other value within the range of 270-280 deg.C.
The rotating speed of the main machine is positively correlated with the layer thickness of the corresponding film, the higher the rotating speed is, the larger the extrusion amount is, the set values of the processing temperature and the die head temperature are above the melting point of the raw material particles, the thickness of each layer of the produced film corresponds to the set values by adjusting the temperature and the rotating speed, the film surface appearance has no holes and meets the industrial requirements, and if the film thickness is beyond the range, the manufactured film does not meet the requirements, and the appearance has defects and the like.
By carrying out three-layer co-extrusion under the conditions, the asymmetric three-layer PBT release film can be obtained.
Further, the application also provides application of the PBT release film, for example, the PBT release film can be used in the preparation process of a flexible circuit board.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a PBT release film, which is an ABC three-layer co-extrusion structure and specifically comprises a first surface layer 1, a middle layer 2 and a second surface layer 3. The skin-care product comprises a first skin layer 1, an intermediate layer 2 and a second skin layer 3, wherein the first skin layer 1 and the second skin layer 3 are respectively positioned on the surfaces of two opposite sides of the intermediate layer 2.
The thickness of the first surface layer 1 was 20 μm, the thickness of the intermediate layer 2 was 105 μm, and the thickness of the second surface layer 3 was 5 μm. The surface roughness Rz of the first surface layer 1 was 16 μm, and the surface roughness Rz of the second surface layer 3 was 6 μm. The raw materials for preparing the first surface layer 1 and the second surface layer 3 are pure PBT, and the raw material for preparing the middle layer 2 is modified PBT.
The preparation method of the modified PBT comprises the following steps: pouring the PBT particles, the toughening agent (EBA), the low-temperature material (EMMA), the PP graft material (maleic anhydride PP graft material) and the compound antioxidant into a stirrer for stirring according to the mixture ratio (mass ratio, 100. Wherein, the processing conditions of extrusion granulation comprise: the temperature is 230 ℃, the rotation speed of the main machine is 60 rpm, and the rotation speed of the feeder is 2rpm. Extruding the mixture from an extrusion port of a double-screw extruder to obtain material strips, drawing the obtained material strips to a granulator, cutting the material strips into granules, and drying the granules at 120 ℃ in vacuum for 4 hours for later use.
The preparation method of the PBT release film comprises the following steps: carrying out three-layer co-extrusion casting on the raw material of the first surface layer 1, the raw material of the second surface layer 3 and the raw material of the third surface layer, specifically, placing the modified PBT particles for preparing the middle layer 2 in a host B, placing the pure PBT particles for preparing the first surface layer 1 in a host A, placing the pure PBT ions for preparing the second surface layer 3 in a host C, wherein the rotation speed of the host A is 15rpm, and the processing temperature is 250 ℃; the rotating speed of the main machine B is 35rpm, and the processing temperature is 245 ℃; the rotating speed of the host C is 6rpm, and the processing temperature is 250 ℃; the die temperature was 275 ℃.
Example 2
The embodiment provides a PBT release film, which is an ABC three-layer co-extrusion structure and specifically comprises a first surface layer 1, a middle layer 2 and a second surface layer 3. The skin-care layer comprises a first skin layer 1, a middle layer 2 and a second skin layer 3, wherein the first skin layer 1 and the second skin layer 3 are respectively positioned on the surfaces of two opposite sides of the middle layer 2.
The thickness of the first surface layer 1 was 25 μm, the thickness of the intermediate layer 2 was 101 μm, and the thickness of the second surface layer 3 was 4 μm. The surface roughness Rz of the first surface layer 1 was 18 μm, and the surface roughness Rz of the second surface layer 3 was 5 μm. The raw materials for preparing the first surface layer 1 and the second surface layer 3 are pure PBT, and the raw material for preparing the middle layer 2 is modified PBT.
The preparation method of the modified PBT comprises the following steps: the preparation method comprises the following steps of pouring PBT particles, a toughening agent (EEA), a low-temperature material (EMMA), a PP graft material (maleic anhydride PP graft material) and a compound antioxidant into a stirrer for stirring according to a ratio (mass ratio, 100. Wherein, the processing conditions of extrusion granulation comprise: the temperature is 210 ℃, the rotation speed of the main machine is 50 rpm, and the rotation speed of the feeder is 1.5rpm. Extruding from an extrusion port of a double-screw extruder to obtain material strips, drawing the obtained material strips to a granulator, granulating, and drying granules in vacuum for 5 hours at 100 ℃ for later use.
The preparation method of the PBT release film comprises the following steps: carrying out three-layer co-extrusion casting on the raw material of the first surface layer 1, the raw material of the second surface layer 3 and the raw material of the third surface layer, specifically, placing the modified PBT particles for preparing the middle layer 2 in a host B, placing the pure PBT particles for preparing the first surface layer 1 in a host A, placing the pure PBT ions for preparing the second surface layer 3 in a host C, wherein the rotation speed of the host A is 12rpm, and the processing temperature is 235 ℃; the rotating speed of the host B is 28rpm, and the processing temperature is 235 ℃; the rotating speed of the host C is 4rpm, and the processing temperature is 235 ℃; the die temperature was 270 ℃.
Example 3
The embodiment provides a PBT release film, which is an ABC three-layer co-extrusion structure and specifically comprises a first surface layer 1, a middle layer 2 and a second surface layer 3. The skin-care layer comprises a first skin layer 1, a middle layer 2 and a second skin layer 3, wherein the first skin layer 1 and the second skin layer 3 are respectively positioned on the surfaces of two opposite sides of the middle layer 2.
The thickness of the first surface layer 1 was 20 μm, the thickness of the intermediate layer 2 was 100 μm, and the thickness of the second surface layer 3 was 7 μm. The surface roughness Rz of the first surface layer 1 was 20 μm, and the surface roughness Rz of the second surface layer 3 was 8 μm. The raw materials for preparing the first surface layer 1 and the second surface layer 3 are pure PBT, and the raw material for preparing the middle layer 2 is modified PBT.
The preparation method of the modified PBT comprises the following steps: pouring PBT particles, a toughening agent (TPU), a low-temperature material (EMMA), a PP graft material (maleic anhydride PP graft material) and a compound antioxidant into a stirrer for stirring according to a ratio (mass ratio, 100. Wherein, the processing conditions of extrusion granulation comprise: the temperature is 250 ℃, the rotation speed of the main engine is 70 rpm, and the rotation speed of the feeder is 2.5rpm. Extruding from an extrusion port of a double-screw extruder to obtain material strips, drawing the obtained material strips to a granulator, granulating, and drying granules in vacuum for 3 hours at 140 ℃ for later use.
The preparation method of the PBT release film comprises the following steps: carrying out three-layer co-extrusion casting on the raw material of the first surface layer 1, the raw material of the second surface layer 3 and the raw material of the third surface layer, specifically, placing the modified PBT particles for preparing the middle layer 2 in a host B, placing the pure PBT particles for preparing the first surface layer 1 in a host A, placing the pure PBT ions for preparing the second surface layer 3 in a host C, wherein the rotation speed of the host A is 20rpm, and the processing temperature is 280 ℃; the rotating speed of the host B is 40rpm, and the processing temperature is 255 ℃; the rotating speed of the host C is 8rpm, and the processing temperature is 280 ℃; the die temperature was 280 ℃.
Example 4
This example differs from example 1 in that: the toughening agent is prepared from TPU and TPE according to the mass ratio of 1:1 compounding ingredients.
Comparative example 1
This comparative example differs from example 1 in that: the thickness of the intermediate layer 2 was 90 μm and the thickness of both the first skin layer 1 and the second skin layer 3 was 20 μm.
Comparative example 2
This comparative example differs from example 1 in that: the thickness of the intermediate layer 2 was 100 μm and the thickness of each of the first skin layer 1 and the second skin layer 3 was 15 μm.
Comparative example 3
The comparative example differs from example 1 in that: the material of which the intermediate layer 2 is made is also pure PBT raw material particles, i.e. the PBT of the intermediate layer 2 is not modified.
Comparative example 4
This comparative example differs from example 1 in that: the surface roughness Rz of the first surface layer 1 was 12 μm.
Comparative example 5
This comparative example differs from example 1 in that: the surface roughness Rz of the second surface layer 3 was 3 μm.
Comparative example 6
This comparative example differs from example 1 in that: the surface roughness Rz of the second surface layer 3 was 10 μm.
Test examples
Taking the PBT release films obtained in examples 1-4 and comparative examples 1-6 as examples, the release performance and the adhesive resistance of the PBT release film are measured and compared with the production cost (BOM cost), wherein the release performance adopts a conventional FPC board pressing test, the adhesive resistance is measured under a microscope, the elongation at break is measured according to GB13022-1991, and the results are shown in Table 1.
TABLE 1 test results
As can be seen from table 1, the asymmetric three-layer PBT release film prepared by the method provided by the application has good release property (usually, the release property is required to be that the release film can be automatically separated from an FPC after the FPC board is pressed) and adhesive resistance (usually, the adhesive resistance is required to be that the adhesive resistance under a microscope is greater than or equal to the enterprise requirement), and the production cost is also significantly reduced.
It should be noted that the surface roughness of the film has no obvious influence on the performance of the film and the cost of the BOM, but is convenient for distinguishing the use surfaces, and the use surface corresponding to the PBT release film produced in the present application is the first surface layer 1, so that the roughness of the two surfaces of the first surface layer 1 and the second surface layer 3 has obvious appearance and hand feeling distinction, so as to distinguish the use surfaces for customers in the aspect.
In conclusion, this application is through setting up asymmetric three-layer PBT from the type membrane, on the membrane gross thickness basis of type membrane is left from to conventional PBT for one side top layer thickness satisfies to leave the type, and another top layer thickness reduces to improve the thickness of intermediate level 2, this mode can increase from the type nature, can increase again and hinder gluey nature, and make the raw materials particle obtain rational utilization, can greatly reduce manufacturing enterprise self and low reaches customer's cost. The PBT release film can be used for preparing a flexible circuit board, so that the bonding of a protective film is effectively avoided, and the defects in the pressing process are reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The PBT release film is characterized by comprising a first surface layer, an intermediate layer and a second surface layer, wherein the first surface layer and the second surface layer are respectively positioned on the surfaces of two opposite sides of the intermediate layer;
the total thickness of the first surface layer, the middle layer and the second surface layer is 110-130 μm, the thickness of the first surface layer is 20-25 μm, and the thickness of the second surface layer is 4-7 μm;
the preparation raw materials of the first surface layer and the second surface layer are both pure PBT, and the preparation raw material of the middle layer is modified PBT.
2. The PBT release film according to claim 1, wherein the thickness of the intermediate layer is 100-110 μm.
3. The PBT release film according to claim 1 or 2, wherein the surface roughness of the first surface layer is Rz ≥ 16 μm, and the surface roughness of the second surface layer is Rz ≤ 5 ≤ 8 μm.
4. The PBT release film according to claim 1 or 2, wherein the modified PBT is obtained by co-extruding and granulating PBT raw material particles and an auxiliary agent;
preferably, the auxiliary agent comprises a toughening agent, a low-temperature soft material, a PP grafting material and an antioxidant;
preferably, 10-20 parts of the toughening agent, 30-50 parts of the low-temperature soft material, 10-20 parts of the PP graft material and 1-5 parts of the antioxidant are used per 100 parts of the PBT raw material particles in parts by mass;
preferably, the extrusion granulation comprises: melting and co-extruding the PBT raw material particles and the auxiliary agent in a double-screw extruder to obtain material strips, and then cutting the material strips into particles;
preferably, the melting temperature is 210-250 ℃;
preferably, after the materials are cut into granules, drying the materials;
preferably, the drying is vacuum drying at 100-140 deg.C for 3-5h.
5. The PBT release film of claim 4, wherein the toughening agent comprises at least one of an ethylene-butyl acrylate copolymer and an ethylene-ethyl acrylate copolymer.
6. The PBT release film according to claim 4, wherein the low temperature soft material comprises EMMA.
7. The PBT release film according to claim 4, wherein the PP graft comprises a maleic anhydride PP graft.
8. The PBT release film according to claim 4, wherein the antioxidant comprises a complex antioxidant of a hindered phenol antioxidant and a phosphite antioxidant.
9. The process for preparing a PBT release film according to any one of claims 1 to 8, comprising the steps of: carrying out three-layer co-extrusion casting on the raw material of the first surface layer, the raw material of the middle layer and the raw material of the second surface layer;
preferably, the rotating speed of the main machine A for extruding the raw material of the first surface layer is 12-20rpm, and the processing temperature is 235-280 ℃; and/or the rotating speed of a host B for extruding the middle layer is 28-40rpm, and the processing temperature is 235-255 ℃; and/or the rotating speed of a main machine C for extruding the second surface layer is 4-8rpm, and the processing temperature is 235-280 ℃; and/or the die temperature is 270-280 ℃.
10. Use of a PBT release film according to any one of claims 1-8 for the manufacture of flexible circuit boards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310258577.1A CN115972731A (en) | 2023-03-17 | 2023-03-17 | PBT release film and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310258577.1A CN115972731A (en) | 2023-03-17 | 2023-03-17 | PBT release film and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115972731A true CN115972731A (en) | 2023-04-18 |
Family
ID=85972492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310258577.1A Pending CN115972731A (en) | 2023-03-17 | 2023-03-17 | PBT release film and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115972731A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961937A (en) * | 2003-07-01 | 2011-02-02 | 住友电木株式会社 | Mold release film and process for producing flexible printed wiring board therewith |
| US20150147510A1 (en) * | 2011-10-08 | 2015-05-28 | Mitsubishi Plastics, Inc. | Substrateless double-sided adhesive sheet |
| CN211688904U (en) * | 2019-12-25 | 2020-10-16 | 昆山致信天城电子材料有限公司 | High-temperature-resistant release film with high adhesive resistance |
| CN213472470U (en) * | 2020-09-28 | 2021-06-18 | 深圳市瑞昌星科技有限公司 | Asymmetric-structure polymer-coated release film |
| CN115011277A (en) * | 2022-08-09 | 2022-09-06 | 宁波长阳科技股份有限公司 | PBT release film and preparation method and application thereof |
| CN218463217U (en) * | 2022-03-03 | 2023-02-10 | 苏州市新广益电子有限公司 | Release film |
-
2023
- 2023-03-17 CN CN202310258577.1A patent/CN115972731A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101961937A (en) * | 2003-07-01 | 2011-02-02 | 住友电木株式会社 | Mold release film and process for producing flexible printed wiring board therewith |
| US20150147510A1 (en) * | 2011-10-08 | 2015-05-28 | Mitsubishi Plastics, Inc. | Substrateless double-sided adhesive sheet |
| CN211688904U (en) * | 2019-12-25 | 2020-10-16 | 昆山致信天城电子材料有限公司 | High-temperature-resistant release film with high adhesive resistance |
| CN213472470U (en) * | 2020-09-28 | 2021-06-18 | 深圳市瑞昌星科技有限公司 | Asymmetric-structure polymer-coated release film |
| CN218463217U (en) * | 2022-03-03 | 2023-02-10 | 苏州市新广益电子有限公司 | Release film |
| CN115011277A (en) * | 2022-08-09 | 2022-09-06 | 宁波长阳科技股份有限公司 | PBT release film and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN115011277B (en) | PBT release film and preparation method and application thereof | |
| KR102714296B1 (en) | Biaxially oriented polyester film | |
| EP1369450B1 (en) | Polyaryl ketone resin film and laminates therof with metal | |
| JP3530829B2 (en) | Fluororesin composition for electronic parts | |
| JPWO2007013330A1 (en) | Method for producing wiring board coated with thermoplastic liquid crystal polymer film | |
| US4770922A (en) | Printed circuit board base material | |
| CN114083864A (en) | Polyester film for three-layer dry film resist and preparation method thereof | |
| US20240251215A1 (en) | Diaphragm for sound generating devices and preparation method thereof, and sound generating device | |
| EP1375112B1 (en) | Liquid-crystal polymer film and manufacturing method thereof | |
| CN1787904B (en) | Fluororesin laminated film and method for producing same | |
| JPH1034742A (en) | Liquid crystal polymer film and its laminate | |
| JP5164615B2 (en) | Release film production method | |
| CN115972731A (en) | PBT release film and preparation method and application thereof | |
| CN106104929B (en) | Anisotropic conductive film and connection method and conjugant | |
| WO2017169662A1 (en) | Film, electrical insulation sheet using same, adhesive tape, and rotating machine | |
| JP3190241B2 (en) | Conductive composite plastic sheets and containers for packaging electronic components | |
| GB2344785A (en) | Conductive laminated sheet | |
| JP4598408B2 (en) | Adhesive sheet | |
| CN113490124B (en) | Vibrating diaphragm capable of being used for sound production device, preparation method of vibrating diaphragm and sound production device | |
| CN114571532B (en) | Die cutting device and method for manufacturing bending-prevention fold copper foil die cutting piece | |
| CN116897190A (en) | Liquid crystal polyester resin composition, liquid crystal polyester film using the composition, metal laminated film using the film, and circuit board | |
| CN114874595A (en) | High-temperature glue-resistant PBT (polybutylene terephthalate) separation membrane for FPC (flexible printed circuit) laminating process and processing process thereof | |
| JP7572535B2 (en) | Liquid crystal polyester resin composition, liquid crystal polyester film using said composition, metal laminate film using said film, and circuit board | |
| JP2002326323A (en) | Conductive transfer film | |
| JPH07164598A (en) | Acrylic resin plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20230418 |
|
| RJ01 | Rejection of invention patent application after publication |