CN115958858A - Self-reinforced polypropylene plate and preparation method thereof - Google Patents
Self-reinforced polypropylene plate and preparation method thereof Download PDFInfo
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- CN115958858A CN115958858A CN202111172377.1A CN202111172377A CN115958858A CN 115958858 A CN115958858 A CN 115958858A CN 202111172377 A CN202111172377 A CN 202111172377A CN 115958858 A CN115958858 A CN 115958858A
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Abstract
The invention relates to a self-reinforced polypropylene plate and a preparation method thereof. The biaxially oriented polypropylene film comprises a reinforcing layer, a first surface layer and a second surface layer, wherein the first surface layer and the second surface layer are respectively connected to the two side surfaces of the reinforcing layer. The self-reinforced polypropylene plate has high strength and is not easy to delaminate. The self-reinforced polypropylene plate is formed by overlapping and hot-pressing a plurality of layers of film-shaped biaxially oriented polypropylene films, has good structural uniformity and high structural strength, does not have bubbles and delamination among layers, and has excellent performance.
Description
Technical Field
The invention relates to the technical field of polypropylene materials, in particular to a self-reinforced polypropylene plate and a preparation method thereof.
Background
Self-reinforced materials are a revolutionary product of recent international high molecular weight materials. There are three methods for preparing self-reinforced polypropylene sheets: film lamination, melt forming and hot pressing of a woven fabric of drawn oriented polypropylene fibers or flat filaments:
the film lamination method is that polymer fiber is evenly wound on a metal frame, then low-melting polymer film is laid on the metal frame, the metal frame is pressed by an upper metal plate and a lower metal plate at a certain temperature, at the moment, the low-melting polymer film is melted and impregnated with the polymer fiber, and in the subsequent cooling process, the low-melting polymer is cooled and the fiber is bonded into a whole to obtain the self-reinforced polymer material. The method has disadvantages in that it is difficult to completely impregnate the fibers due to the high viscosity of the low-melting polymer within the processing window, and it is difficult to exhaust air from the system, thereby making it difficult to ensure the uniformity of the self-reinforced material.
The melt forming is that firstly, the high melting point polymer and the low melting point polymer are formed into a sandwich structure round wire or flat wire with a high melting point polymer core part and a low melting point polymer skin part by a coextrusion-stretching method, and then the round wire or the flat wire is woven into a fabric. The forming die comprises a metal frame and a flat die, wherein the inner side of the metal frame is larger than the outer side of the flat die. In pressing, the fabric is fixed on a metal frame, placed between an upper plate and a lower plate of a mold, and then a certain temperature and pressure are applied, at which the skin polymer is melted and bonded, and the core structure is retained, thereby obtaining a self-reinforced polymer plate. The method has the advantages that the obtained material has good performance, and the defects of complex operation and narrow process temperature range limit the application of the material.
Patent CN 105172277A discloses a method for preparing a self-reinforced polypropylene composite plate, which adopts a fabric woven by stretching oriented polypropylene fibers or flat filaments, and a polypropylene woven cloth coated with polypropylene on the surface, and obtains the self-reinforced polypropylene composite plate by hot pressing multiple layers of polypropylene woven cloth in an unconstrained manner. The method has the defects of continuous production, low interlayer peeling strength of the prepared self-reinforced polypropylene plate, easy delamination in the plate post-processing process and great problem on products, and thus needs to be improved.
Disclosure of Invention
The invention aims to provide a self-reinforced polypropylene plate and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a self-reinforced polypropylene plate which is formed by sequentially laminating and hot-pressing two or more layers of biaxially oriented polypropylene films, wherein each biaxially oriented polypropylene film comprises a reinforcing layer, a first surface layer and a second surface layer, and the first surface layer and the second surface layer are respectively connected to the two side surfaces of the reinforcing layer.
In an embodiment, the first facing and/or the second facing are thermally adhesive.
In one embodiment, the biaxially oriented polypropylene film is oriented in the extrusion direction to a machine direction orientation, wherein the machine direction orientation is from 4 to 6 times.
In one embodiment, the biaxially oriented polypropylene film is oriented in the transverse direction perpendicular to the direction of extrusion, wherein the transverse direction orientation is 7 to 10 times.
In one embodiment, the biaxially oriented polypropylene film is slit into sheets or strips.
The invention provides a preparation method of the self-reinforced polypropylene plate, which comprises the following steps:
overlapping two or more layers of biaxially oriented polypropylene films in a working area;
heating two or more layers of biaxially oriented polypropylene films to working temperature and then pressing;
and cooling the two or more layers of biaxially oriented polypropylene films after hot pressing.
Heating two or more layers of biaxially oriented polypropylene films to working temperature and then pressing, wherein the working temperature of hot pressing is 50-300 ℃.
In one embodiment, the two or more biaxially oriented polypropylene films are heated to a working temperature and then pressed, wherein the working pressure of the pressing is 10 to 15MPa.
In one embodiment, the two or more biaxially oriented polypropylene films are heated to the working temperature and then pressed, wherein the heating is performed by using heat conducting oil.
In one embodiment, the two or more biaxially oriented polypropylene films after hot pressing are cooled, wherein the cooling temperature is 10-50 ℃.
The invention has the beneficial effects that: the self-reinforced polypropylene plate has high strength and is not easy to delaminate. The self-reinforced polypropylene plate is formed by overlapping and hot-pressing a plurality of layers of film-shaped biaxially oriented polypropylene films, has good structural uniformity and high structural strength, does not have bubbles and delamination among layers, and has excellent performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below. It is obvious that the drawings described below 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 cross-sectional view of a self-reinforced polypropylene sheet according to the present invention.
FIG. 2 is a schematic view of the processing of the biaxially oriented polypropylene film of the present invention.
FIG. 3 is a schematic view of the processing of biaxially oriented polypropylene film according to the present invention in a laminated state and a hot-pressed state.
FIG. 4 is a schematic illustration of the cold state processing of the self-reinforced polypropylene sheet of the present invention.
FIG. 5 is a schematic diagram of the process for preparing the self-reinforced polypropylene sheet according to the present invention.
In the figure: a biaxially oriented polypropylene film 10; a reinforcing layer 11; a first facing 12; a second facing layer 13; pressing the mold 20; a water pipe 21.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; for a better explanation of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and the specific meanings of the terms may be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" or the like, if appearing to indicate a connection relationship between the components, is to be understood broadly, for example, as being fixed or detachable or integral; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be connected through any combination of two or more members or structures. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1 to 4, the present invention discloses a self-reinforced polypropylene plate, which comprises two or more layers of biaxially oriented polypropylene films 10 laminated in sequence and hot pressed. Among them, biaxially Oriented Polypropylene films 10 (BOPP) are produced by first making a melt of high molecular Polypropylene into a sheet or a thick film through a long narrow head, then stretching the melt in two perpendicular directions (longitudinal and transverse directions) simultaneously or stepwise in a special stretching machine at a certain temperature and a set speed, and then subjecting the stretched film to appropriate cooling or heat treatment or special processing (such as corona, coating, etc.).
The self-reinforced polypropylene sheet has two or more layers of biaxially oriented polypropylene films 10 stacked one on another, for example, the number of layers of the self-reinforced polypropylene sheet includes two, three, four, five, six, eight, ten, fifteen, twenty-five, thirty, and the like. The number of layers of the self-reinforced polypropylene plate is flexibly adjusted according to the actual design requirement by the number of layers of the biaxially oriented polypropylene film 10, so as to meet the production requirement.
In one embodiment, the biaxially oriented polypropylene film 10 includes a reinforcing layer 11, a first facing layer 12 and a second facing layer 13 attached to both side surfaces of the reinforcing layer 11. The first facing layer 12 and the second facing layer 13 are located on both sides of the reinforced layer 11, so that the two adjacent layers of the biaxially oriented polypropylene film 10 are correspondingly attached to each other. The first surface layer 12 and the second surface layer 13 are used as surface connecting layers, and are connected with the surface connecting layer of the adjacent biaxially oriented polypropylene film 10 into a whole by hot pressing in the hot pressing process, so that the two adjacent biaxially oriented polypropylene films 10 are in an integral structure. The reinforced layers 11 are distributed on the self-reinforced polypropylene plate after being pressed at intervals to form a multi-layer reinforced structural form, so that the structural strength and the stability of the self-reinforced polypropylene plate are improved. The two adjacent layers of biaxially oriented polypropylene films 10 are connected into a whole through the surface connecting layer by hot pressing to form an integral structure, the bonding part has no defects such as bubbles, and the surface connecting layer is hot-melted into a whole, so that a phenomenon structure cannot be formed, and the performance stability is high.
Wherein the first surface layer 12 and/or the second surface layer 13 have hot adhesiveness, and the adhesiveness of the first surface layer 12 and/or the second surface layer 13 is enhanced after the biaxially oriented polypropylene film 10 is heated to the operating temperature of the hot-pressing equipment. Two adjacent layers of biaxially oriented polypropylene films 10 are connected into a whole by hot pressing under the pressing working pressure of the pressing equipment so as to form an integrated self-reinforced polypropylene plate, and the pressing is convenient.
Optionally, the biaxially oriented polypropylene film 10 is oriented in the extrusion direction to a machine direction orientation, wherein the machine direction orientation is 4 to 6 times. Alternatively, the biaxially oriented polypropylene film 10 is oriented in the transverse direction perpendicular to the direction of extrusion, wherein the transverse direction orientation is 7 to 10 times. In the present embodiment, the biaxially oriented polypropylene film 10 used is a biaxially oriented polypropylene film 10 having a three-layer structure. The biaxially oriented polypropylene film 10 has a curvature in the extrusion direction of the Machine Direction (MD) and a Transverse Direction (TD) orientation perpendicular to the extrusion direction, preferably 4 to 6 times MD orientation and 7 to 10 times TD orientation, to produce a self-reinforced polypropylene sheet material having high strength and not prone to delamination.
In the above embodiment, the biaxially oriented polypropylene film 10 is cut into blocks, and the biaxially oriented polypropylene film 10 is placed in a custom mold to form a self-reinforced polypropylene sheet material of a prefabricated shape, such as a block-shaped, curved, irregular cross-section custom product, with high manufacturing flexibility. Or, the biaxially oriented polypropylene film 10 is cut into long films, a plurality of biaxially oriented polypropylene films 10 are sequentially laminated and pressed to form a long continuous film structure, and different products and shapes are processed by a subsequent disassembling process.
As shown in fig. 1 to 5, the present invention also discloses a method for preparing the self-reinforced polypropylene sheet material disclosed in the above embodiments, which comprises the following steps:
s101: two or more layers of biaxially oriented polypropylene films 10 are laminated in a working area, which is a pressing area of a pressing device, such as the biaxially oriented polypropylene film 10 is located in a pressing mold 20.
S102: heating two or more layers of biaxially oriented polypropylene films 10 to working temperature and then pressing. For example, the surface of the press mold 20 is heated and the heat is transferred to the biaxially oriented polypropylene film 10 so that the surface bonding layer of the biaxially oriented polypropylene film 10 is in a temperature range in which the hot tack is optimum. Optionally, the working temperature of hot pressing is 50-300 deg.C, specifically 50 deg.C, 60 deg.C, 80 deg.C, 100 deg.C, 150 deg.C, 200 deg.C, 250 deg.C, 300 deg.C. Optionally, the working temperature of the hot pressing may be heated by heat radiation, heat transfer, or the like, in an embodiment, the heating is performed by using heat conduction oil, and the heat conduction oil heats the pressing mold 20, so that the heat conduction stability is good, the balance is good, and the hot pressing effect is good. Optionally, the working pressure of the pressing mold 20 is 10 to 15MPa, so that the surface connection layer of the biaxially oriented polypropylene film 10 is pressed in the temperature range with the optimal thermal adhesiveness, and the pressure is balanced, so as to improve the fusion of the two adhered surface connection layers into a whole. For example, the working pressure of the press mold 20 is 10MPa, 11MPa, 12MPa, 13MPa, 14MPa, 15MPa.
S103: and cooling the two or more layers of the biaxially oriented polypropylene films 10 after hot pressing, wherein the biaxially oriented polypropylene films 10 need to be cooled and formed after hot pressing. Wherein the cooling temperature is 10-50 ℃. For example, the cooling temperature is 10 ℃, 20 ℃, 30 ℃, 40 ℃, 50 ℃ or the like. Wherein, the cooling mode includes the water pipe 21 of installing in the roll table to constitute liquid cooling drive. The heat of the biaxially oriented polypropylene film 10 is cooled through the heat exchange of the liquid in the water pipe 21 in the roller transmission process, so that the heat balance in the same longitudinal range is kept, and the delamination is avoided.
It should be understood that the above-described embodiments are merely preferred embodiments of the invention and the technical principles applied thereto. Various modifications, equivalent substitutions, changes, etc., will also be apparent to those skilled in the art. However, such variations are within the scope of the invention as long as they do not depart from the spirit of the invention. In addition, certain terms used in the specification and claims of the present application are not limiting, but are used merely for convenience of description.
Claims (10)
1. The self-reinforced polypropylene plate is characterized by comprising two or more layers of biaxially oriented polypropylene films which are sequentially overlapped and hot-pressed, wherein each biaxially oriented polypropylene film comprises a reinforcing layer, a first surface layer and a second surface layer, and the first surface layer and the second surface layer are respectively connected to the surfaces of the two sides of the reinforcing layer.
2. The self-reinforced polypropylene sheet material of claim 1, wherein the first facing and/or the second facing have hot tack.
3. The self-reinforced polypropylene sheet according to claim 1, wherein the biaxially oriented polypropylene film is oriented in the extrusion direction to a machine direction orientation, wherein the machine direction orientation is 4 to 6 times.
4. The self-reinforced polypropylene sheet according to claim 1, wherein the biaxially oriented polypropylene film is oriented in the transverse direction perpendicular to the extrusion direction, wherein the transverse direction orientation is 7 to 10 times.
5. The self-reinforced polypropylene sheet according to claim 1, wherein the biaxially oriented polypropylene film is cut into a block or a strip film.
6. A method for preparing the self-reinforced polypropylene sheet material as claimed in any one of claims 1 to 5, comprising:
overlapping two or more layers of biaxially oriented polypropylene films in a working area;
heating two or more layers of biaxially oriented polypropylene films to working temperature and then pressing;
and cooling the two or more layers of biaxially oriented polypropylene films after hot pressing.
7. The preparation method according to claim 6, wherein the two or more biaxially oriented polypropylene films are heated to a working temperature and then pressed, wherein the working temperature of the hot pressing is 50-300 ℃.
8. The preparation method according to claim 6, wherein the two or more biaxially oriented polypropylene films are heated to an operating temperature and then pressed, wherein the working pressure of the pressing is 10-15 MPa.
9. The preparation method according to claim 6, wherein the two or more layers of biaxially oriented polypropylene films are heated to the working temperature and then pressed, wherein the heating is performed by using heat transfer oil.
10. The method according to claim 6, wherein the two or more biaxially oriented polypropylene films are cooled after the hot pressing, wherein the cooling temperature is 10 to 50 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111172377.1A CN115958858A (en) | 2021-10-08 | 2021-10-08 | Self-reinforced polypropylene plate and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111172377.1A CN115958858A (en) | 2021-10-08 | 2021-10-08 | Self-reinforced polypropylene plate and preparation method thereof |
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| Publication Number | Publication Date |
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| CN115958858A true CN115958858A (en) | 2023-04-14 |
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| CN202111172377.1A Pending CN115958858A (en) | 2021-10-08 | 2021-10-08 | Self-reinforced polypropylene plate and preparation method thereof |
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- 2021-10-08 CN CN202111172377.1A patent/CN115958858A/en active Pending
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