TWI706853B - Polyolefin releasing film and method for manufacturing the same, and thermoplastic polyurethane composite structure - Google Patents

Abstract

The present invention provides a polyolefin releasing film and a method for manufacturing the same, and a thermoplastic polyurethane composite structure. The polyolefin releasing film is for supporting thermoplastic polyurethane and is formed by a polyolefin composition. The polyolefin composition contains 100 parts by weight of polypropylene resin, 1 to 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler and 0.1 to 30 parts by weight of an additive. The polypropylene resin has a melting index of from 0.3 to 20 g/10 min. The polyolefin releasing film provided by the instant disclosure is suitable for supporting thermoplastic polyurethane without the need of additional anti-adhesion layer.

Description

Polyolefin release film and manufacturing method thereof, and thermoplastic polyurethane composite structure

The invention relates to a polyolefin release film and a manufacturing method thereof and a thermoplastic polyurethane composite structure, in particular to a polyolefin release film for carrying thermoplastic polyurethane, a manufacturing method thereof, and a thermoplastic polyurethane containing the polyolefin release film Composite structure.

If the thermoplastic polyurethane resin does not use a load-bearing release film during processing, it is prone to problems such as excessive flattening difficulty and stickiness. Furthermore, the thermoplastic polyurethane resin processed without the use of a carrier release film also has the disadvantage of dimensional instability during the subsequent printing process.

In the prior art, it is known to use the following types of products as release films for carrying thermoplastic polyurethane resin. The cost of the following release films is arranged from high to low: (1) Embossing with traditional paper, and then through special anti-sticking The release film formed by resin coating on traditional paper is generally embossed by laser, so the surface is bright and not easy to be atomized; (2) Coated with polyethylene terephthalate (PET) film Release film made of special release resin, which is only suitable for high-gloss products; and (3) Release film made of traditional paper coated with polyethylene (PE) on both sides.

Among the above-mentioned release films, the three release films with different costs and manufacturing methods all have an additional resin layer on the substrate (such as traditional paper or PET) to achieve the release effect. In addition, the release films numbered (1) and (2) have higher cost and limited application range, and the release film number (3) has ordinary surface quality, difficult manufacturing process control, and quality between batches. Unstable and prone to dimensional changes or abnormal warpage. In other words, the prior art release film for thermoplastic polyurethane resin still has room for improvement.

The technical problem to be solved by the present invention is to provide a polyolefin release film and a manufacturing method thereof, and a thermoplastic polyurethane composite structure in view of the deficiencies of the prior art, which can overcome the need to use an additional release layer (release layer) in the prior art. The shortcoming of easy peeling is achieved after supporting the thermoplastic polyurethane.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a polyolefin release film, which is used to support thermoplastic polyurethane and is formed of a polyolefin composition. It contains 100 parts by weight of a polypropylene resin, 1 to 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler, and 0.1 to 30 parts by weight of additives, wherein the polypropylene resin has a range of 0.3 To the melt index between 20g/10min.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a method for manufacturing a polyolefin release film, which includes: kneading and gelling a polyolefin composition to form a gelled material; And calendering the gelatinized material by a tape machine to form the polyolefin release film. The polyolefin composition includes 100 parts by weight of a polypropylene resin, 1 to 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler, and 1 to 30 parts by weight of additives, wherein the poly The propylene resin has a melt index between 0.3 and 20.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a thermoplastic polyurethane composite structure, which includes a thermoplastic polyurethane layer and a polyolefin release film. The polyolefin release film is formed of a polyolefin composition, and the polyolefin composition includes 100 parts by weight of a polypropylene resin, 1 to 100 parts by weight of a functional resin, and 5 to 150 parts by weight. A filler and 1-30 parts by weight of additives, wherein the polypropylene resin has a melt index between 0.3 and 20. The thermoplastic polyurethane layer is directly coated on one surface of the polyolefin release film.

One of the beneficial effects of the present invention is that the polyolefin release film, the manufacturing method thereof, and the thermoplastic polyurethane composite structure provided by the present invention can be passed through "the polyolefin composition contains 100 parts by weight of a polypropylene resin, 1 To 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler, and 0.1 to 30 parts by weight of additives" and "the polypropylene resin has a melt index between 0.3 and 20g/10min" The technical solution is to provide a polyolefin release film that has excellent tensile strength and elongation, can be recycled and reused, and can be well applied to thermoplastic polyurethane without using an additional release layer.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

S‧‧‧Thermoplastic polyurethane composite structure

1‧‧‧Polyolefin release film

2‧‧‧Thermoplastic polyurethane layer

41‧‧‧Delivery Station

42‧‧‧Embossing laminating machine

43‧‧‧Curing oven

44‧‧‧Cooling wheel

45‧‧‧Coiler

46‧‧‧Dry head

FIG. 1 is a schematic diagram of the processing flow of the polyolefin release film provided by an embodiment of the present invention applied to carrying thermoplastic polyurethane resin; FIG. 2 is a flowchart of the manufacturing method of the polyolefin release film provided by the embodiment of the present invention; and 3 is a schematic diagram of a thermoplastic polyurethane composite structure provided by an embodiment of the present invention.

The following are specific examples to illustrate the implementation of the "polyolefin release film and its manufacturing method, and thermoplastic polyurethane composite structure" disclosed in the present invention. Those skilled in the art can understand the present invention from the content disclosed in this specification. Advantages and effects. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are merely schematic illustrations, and are not drawn according to actual dimensions, and are stated in advance. The following embodiments will further describe the related technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that the term "or" used in this document may include any one or a combination of more of the associated listed items depending on the actual situation.

The present invention provides a polyolefin release film, which is a release film for supporting thermoplastic polyurethane. Specifically, one surface of the polyolefin release film provided by the present invention can be used to bond with the thermoplastic polyurethane layer formed by the melt extrusion manufacturing method to form a thermoplastic polyurethane composite structure. The thermoplastic polyurethane composite structure can be wound into a roll-like material, and when the thermoplastic polyurethane film is about to be used (for example, processed), it can be peeled off from the polyolefin release film. In other words, the polyolefin release film provided by the present invention must have proper adhesion and peeling ability relative to the thermoplastic polyurethane film.

Please refer to FIG. 1 first. FIG. 1 is a schematic diagram of a processing flow of a polyolefin release film provided in an embodiment of the present invention applied to a thermoplastic polyurethane resin. When the polyolefin release film provided by the embodiment of the present invention is used as the release film for carrying the thermoplastic polyurethane resin, the base paper can be sent through the unwinder first, that is, the polyolefin as the release film The release film 1 is transported to the embossing laminator 42 (laminator). Next, in the embossing and bonding stage, the melt-extruded thermoplastic polyurethane resin supplied through the film head 46 (T-die) is coated on the surface of the polyolefin release film 1.

Specifically, the thermoplastic polyurethane resin supplied by the laminating head 46 may be a thermoplastic polyurethane resin material formed by extruding thermoplastic polyurethane pellets (TPU chips) from an extruder (not shown). In this way, the thermoplastic polyurethane resin is coated on the surface of the polyolefin release film 1 to form a double-layer structure.

Next, the two-layer structure including the polyolefin release film 1 and the thermoplastic polyurethane resin is transported to the curing oven 43 to dry the thermoplastic polyurethane resin, and then is cooled by the cooling wheel 44 to form a polyolefin release film. The two-layer structure of the film 1 and the thermoplastic polyurethane layer 2. Finally, the finished product is crimped by a winder 45 (winder) to produce the thermoplastic polyurethane composite structure S.

Please refer to FIG. 3, which is a schematic diagram of a thermoplastic polyurethane composite structure provided by an embodiment of the present invention. In other words, Fig. 3 shows the manufacturing method of Fig. 1 Thermoplastic polyurethane composite structure S in roll shape. The thermoplastic polyurethane composite structure S includes a thermoplastic polyurethane layer 2 and a polyolefin release film 1, and the thermoplastic polyurethane layer 2 is directly disposed on one surface of the polyolefin release film 1. In other words, in the thermoplastic polyurethane composite structure S provided by the embodiment of the present invention, no additional release layer (additional release layer) is used between the polyolefin release film 1 and the thermoplastic polyurethane layer 2. In fact, through the polyolefin composition and the polyolefin release film 1 manufacturing method described below, the manufacturing method can be simple, temperature-resistant, stiff, with good flatness, no delamination, no wrinkles, waterproof and moisture-proof Good performance, good antistatic property, good antifouling property, especially the polyolefin release film 1 with good release property from the thermoplastic polyurethane layer 2.

In the embodiment of the present invention, the polyolefin release film provided by the present invention is formed of a polyolefin composition. The polyolefin composition includes 100 parts by weight of polypropylene resin, 1 to 100 parts by weight of functional resin, 5 to 150 parts by weight of fillers, and 0.1 to 30 parts by weight of additives, wherein the polypropylene resin has between Melt index between 0.3 and 20g/10min.

As mentioned above, in order to make the polyolefin release film 1 provided by the present invention suitable for the application of supporting thermoplastic polyurethane resin, the components of the polyolefin composition used to form the polyolefin release film 1 must be selected. In the embodiment of the present invention, a polypropylene resin is used in combination with functional resins, fillers and additives to impart desired characteristics to the produced polyolefin release film 1.

For example, the polypropylene resin used in the polyolefin composition of the present invention may have a Melt Flow Index (MFI) between 3 and 20 g/10 min. In the embodiment of the present invention, a polypropylene resin with a low melting point and good ductility can be selected. The melting point of the polypropylene resin may be between 130 and 165°C. Specifically, for the application of the thermoplastic polyurethane resin, the present invention selects a polypropylene resin having a melt index in the above-mentioned specific range as the main component of the polyolefin composition. Considering that the hot melt extrusion temperature of the thermoplastic polyurethane resin is relatively high, the polyolefin release film 1 used to carry the thermoplastic polyurethane resin must have sufficient temperature resistance. In addition, the selection of polypropylene resin with a melt index in the above range is also conducive to processing with a tape machine. Manufacture of polyolefin release film 1. However, the present invention is not limited to the above-mentioned examples.

In the embodiment of the present invention, the functional resin is used as a modifier, and may be a resin with excellent ductility and a low melting point, such as high-density polyethylene with a melt index between 0.2 and 30 g/10 min. HDPE), linear low-density polyethylene (LLDPE) or low-density polyethylene (LDPE) with a melt index between 0.3 and 30g/10min. In one embodiment, the functional resin may include a mixture of two or more of the above-mentioned polyethylene resins. However, the present invention is not limited to the above-mentioned examples.

For example, the functional resin may include 1 to 50 parts by weight of high density polyethylene, 1 to 100 parts by weight of linear low density polyethylene, or 1 to 100 parts by weight of low density polyethylene. It is worth mentioning that the functional resin may not include high-density polyethylene, that is, the amount of high-density polyethylene can be zero. The use of the above functional resin as a component of the polyolefin composition can make the produced polyolefin release film have good ductility, no delamination, no wrinkles, and easy processing on the surface. However, the present invention is not limited to the above-mentioned examples.

In the polyolefin release film composition provided by the embodiment of the present invention, the filler may be glass fiber, asbestos fiber, carbon fiber, boron fiber, mica, silica, talc, silicate, calcium carbonate, metal oxide And one or more of carbon black. The use of fillers can make the polyolefin release film have higher strength and hardness, or can improve its scratch resistance or heat resistance. In addition, the additives may be light stabilizers, ultraviolet absorbers, ethylene vinyl acetate copolymer (EVA), or vinyl olefin copolymer elastomers. In the present invention, the types of fillers and additives are not limited here, and can be selected and adjusted on the premise of achieving the desired characteristics of the polyolefin release film.

In the present invention, the polyolefin composition can be kneaded and gelatinized by a kneader, and then the rubber particles can be calendered by a calender (also called a tape machine) to form the polyolefin release film 1. Next, please cooperate with FIG. 2, and the manufacturing method of the polyolefin release film 1 will be described in detail below. In addition, the physical properties of the polyolefin release film 1 will be described later.

As shown in Figure 2, the manufacturing method of the polyolefin release film provided by the present invention includes: kneading and gelling the polyolefin composition to form a gelled material (step S100); and calendering the gelled material to A polyolefin release film is formed (step S102).

Continuing from the above, the polyolefin composition used in step S100 may be the above-mentioned containing 100 parts by weight of polypropylene resin, 1 to 100 parts by weight of functional resin, 5 to 150 parts by weight of a filler, and 0.1 to 30 parts by weight. Parts of the additive polyolefin composition. The types and proportions of the components in the polyolefin composition are the same as previously described. For example, the polypropylene resin may have a melt index between 0.3 and 20 g/min. However, the present invention is not limited to the above-mentioned examples.

In the embodiment of the present invention, in step S100, the various components in the polyolefin composition can be mixed, kneaded and gelatinized by a kneader, thereby forming a gelatinized material. Next, in step S102, the gelatinized material can be calendered and formed by a calender to produce a piece of material. After calendering the gelatinized material, the calendered sheet material can be further subjected to the steps of stretching, embossing and surface treatment at the same time. For example, by embossing the sheet material, at least one surface of the polyolefin release film 1 can be formed with at least one embossing, such as hairline, carbon fiber, etc. In one of the embodiments of the present invention, the polyolefin release film 1 is a material layer after corona treatment. However, the present invention is not limited to the above-mentioned examples.

In other words, in addition to supporting the thermoplastic polyurethane resin (thermoplastic polyurethane layer 2), the polyolefin release film 1 can also simultaneously transfer the lines of the polyolefin release film 1 to the supported thermoplastic polyurethane through the transfer technology. The surface of layer 2. Therefore, the lines on the surface of the polyolefin release film 1 can be transferred to one of the surfaces of the thermoplastic polyurethane layer 2 to form transfer lines.

According to the requirements of different texture transfer, appropriate embossing wheels can be selected to produce the polyolefin release film 1 with different textures whose surface can be atomized or brightened. For example, according to different demand characteristics, special ON-LINE embossing (such as leather pattern 490, carbon fiber pattern 113L, fine mist 463 pattern, mirror 001 pattern, cloth pattern 1071 The cloth pattern 1073 and the rough pattern 005 pattern, etc.) make the polyolefin release film 1 have different appearance and surface characteristics. In this way, in addition to imparting specific textures to the supported thermoplastic polyurethane layer 2, additional materials such as anti-adhesive agents (for example, release resins) can also be used to achieve the effect of mutual adhesion with the thermoplastic polyurethane layer 2. However, the present invention is not limited to the above-mentioned examples.

Next, the characteristics of the polyolefin release film 1 provided by the embodiment of the present invention will be described. Specifically, the following characteristics are related to the selection and ratio of the components of the polyolefin composition, and the parameters selected in the manufacturing method of the polyolefin release film 1. In the present invention, the components of the polyolefin composition and related characteristics (such as melt index) can be appropriately adjusted to obtain a polyolefin release film 1 having the following characteristics. In addition, as mentioned above, by selecting different surface processing methods, the surface characteristics of the polyolefin release film 1 can be further adjusted.

First, the polyolefin release film 1 provided by the embodiment of the present invention may have a thickness ranging from 0.08 to 0.3 mm. In addition, the polyolefin release film 1 may have a longitudinal tensile strength of at least 2800 psi and a transverse tensile strength of at least 2000 psi, and a longitudinal elongation of at least 200% and a transverse elongation of at least 40%. In one of the embodiments of the present invention, the polyolefin release film 1 has a longitudinal elongation of more than 400% and a transverse elongation of at least 100%.

Specifically, the polyolefin release film 1 with the above-mentioned characteristics has excellent mechanical strength and ductility. As a result, it can ensure the temperature resistance and stiffness of the product when it is used to support thermoplastic polyurethane extruded by high-temperature melting. It also provides excellent anti-peeling properties when the thermoplastic polyurethane layer 2 and the polyolefin release film 1 need to be separated, that is, the thermoplastic polyurethane layer 2 can be peeled from the polyolefin release film 1 as required.

Specific experiment example

The following will take the polyolefin release film 1 provided by one of the embodiments of the present invention as an example to show the characteristics of the polyolefin release film 1 provided by the present invention after testing.

Table 1 lists the characteristics of one of the polyolefin release films 1 in the present invention, as well as the characteristic standards that have been tested to be well applicable to the bearing thermoplastic polyurethane layer 2. In Table 1, the thickness of the polyolefin release film 1 is 0.15 mm, and its surface is a matte surface. It can be seen from the content of Table 1 that the polyolefin release film 1 provided by the present invention is well applicable to the technical application of thermoplastic polyurethane resin.

In the above table, MD represents the longitudinal value and CD represents the lateral value. ER and GR represent the two opposite surfaces of the polyolefin release film 1 respectively.

Table 2 lists the characteristics of another polyolefin release film 1 in the present invention, as well as the characteristic standards that have been tested to be well suited for the bearing thermoplastic polyurethane layer 2. In Table 2, the thickness of the polyolefin release film 1 is 0.15 mm, and its surface is bright. It can be seen from the content of Table 1 that the polyolefin release film 1 provided by the present invention is well applicable to the technical application of thermoplastic polyurethane resin.

[Beneficial effects of the embodiment]

One of the beneficial effects of the present invention is that the polyolefin release film 1, its manufacturing method, and the thermoplastic polyurethane composite structure S provided by the present invention can pass "polyolefin composition containing 100 parts by weight of polypropylene resin, 1 to 100 parts by weight of functional resin, 5 to 150 parts by weight of fillers, and 0.1 to 30 parts by weight of additives" and "polypropylene resin has a melt index between 0.3 and 20g/10min" technical solutions to provide It has excellent tensile strength and elongation, can be recycled and reused, and can be well applied to the polyolefin release film 1 of thermoplastic polyurethane without using an additional release layer.

Furthermore, the polyolefin release film 1 provided by the present invention is made of a polyolefin composition with a specific composition ratio. In addition, according to product requirements, different surface treatment steps (such as using different Embossing wheel set) to give the surface of the polyolefin release film 1 different surface characteristics (embossing, surface tension, roughness, etc.). In this way, the polyolefin release film 1 can be made by a calender by a relatively simple manufacturing method, and has temperature resistance, stiffness, good flattening, no delamination of the solid material, no wrinkles, and waterproof It has good moisture resistance, good antistatic properties, good antifouling properties and a variety of textures, especially with the advantages of proper adhesion to the thermoplastic polyurethane layer 2 and good release and anti-stripping properties.

The content disclosed above is only a preferred and feasible embodiment of the present invention, and does not limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the description and schematic content of the present invention are included in the application of the present invention. Within the scope of the patent.

The designated representative diagram is a flowchart, so there is no symbol for simple description

Claims (9)

A polyolefin release film, which is used to support thermoplastic polyurethane and is formed of a polyolefin composition, the polyolefin composition comprising 100 parts by weight of a polypropylene resin, 1 to 100 parts by weight of a functional Resin, 5 to 150 parts by weight of a filler and 0.1 to 30 parts by weight of additives, wherein the polypropylene resin has a melt index between 0.3 and 20g/10min but not including 20g/10min; wherein The polyolefin release film has a longitudinal tensile strength of at least 2800 psi and a transverse tensile strength of at least 2000 psi. The polyolefin release film according to claim 1, wherein the polyolefin release film has a thickness between 0.08 and 0.3 mm. The polyolefin release film according to claim 1, wherein at least one surface of the polyolefin release film has at least one embossing. The polyolefin release film according to claim 1, wherein the functional resin comprises at least one of a high density polyethylene, a linear low density polyethylene, and a low density polyethylene, and the high density polyethylene Polyethylene has a melt index between 0.2 and 30. The polyolefin release film according to claim 1, wherein the additive includes at least one of a light stabilizer, an ultraviolet absorber, an ethylene vinyl acetate copolymer, and a vinyl olefin copolymer elastomer . The polyolefin release film according to claim 1, wherein the polyolefin release film has a longitudinal elongation of at least 200% and a transverse elongation of at least 40%. A method for manufacturing a polyolefin release film, comprising: kneading and gelling a polyolefin composition to form a gelatinized material, wherein the polyolefin composition contains 100 parts by weight of a polypropylene resin, To 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler, and 1 to 30 parts by weight of additives, wherein the polypropylene resin has between 0.3 and 20 but does not contain 20g/10min Melt index; and The glued material is calendered by a tape machine to form the polyolefin release film; wherein the polyolefin release film has a longitudinal tensile strength of at least 2800 psi and a transverse tensile strength of at least 2000 psi. A thermoplastic polyurethane composite structure, comprising: a thermoplastic polyurethane layer; and a polyolefin release film, the polyolefin release film is formed by a polyolefin composition, the polyolefin composition contains 100 parts by weight A polypropylene resin, 1 to 100 parts by weight of a functional resin, 5 to 150 parts by weight of a filler, and 1 to 30 parts by weight of additives, wherein the polypropylene resin has a range of 0.3 to 20 parts Does not include a melt index of 20g/10min; wherein the polyolefin release film has a longitudinal tensile strength of at least 2800 psi and a transverse tensile strength of at least 2000 psi; wherein the thermoplastic polyurethane layer is directly coated on the polyolefin On one surface of the release film. The thermoplastic polyurethane composite structure according to claim 8, wherein the surface of the polyolefin release film has at least one texture, and at least one of the textures is transferred to a surface of the thermoplastic polyurethane layer. Form a transfer pattern.

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