TW201932285A - Polyoledin 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, manufacturing method thereof, and thermoplastic polyurethane composite structure

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

Thermoplastic polyurethane (Thermoplastic Polyurethane) resins are prone to problems such as excessive difficulty in flattening, stickiness, etc., if no release film is used during processing. Moreover, the thermoplastic polyurethane resin processed without using a 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 a release film carrying a thermoplastic polyurethane resin. The cost of the following release films is ranked from high to low: (1) embossing with traditional paper, and The release film formed by resin coating on traditional paper is generally laser embossed, so the surface is bright and not easy to fog; (2) coated with polyethylene terephthalate (PET) film The release film made of special anti-adhesive resin is only suitable for high-gloss products; and (3) the release film made of traditional paper double-sided polyethylene (PE).

Among the above-mentioned release films, three release films with different costs and manufacturing methods are all provided with a resin layer on a substrate (such as traditional paper or PET) to achieve the effect of release. In addition, the release films of No. (1) and (2) are relatively expensive and have a limited range of application. The release film of No. (3) has ordinary surface quality, difficult manufacturing process control, and batch-to-batch quality. Unstable and prone to dimensional changes or abnormal warpage. In other words, there is still room for improvement in the prior art release films for thermoplastic polyurethane resins.

The technical problem to be solved by the present invention is to provide a polyolefin release film, a method for manufacturing the same, and a thermoplastic polyurethane composite structure in response to the shortcomings of the prior art, which can overcome the need to use an additional release layer (release layer) in the prior art The disadvantage of easy peeling is achieved after carrying 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 for carrying a thermoplastic polyurethane and is formed of a polyolefin composition. The polyolefin composition It 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 0.1 to 30 parts by weight of an additive, wherein the polypropylene resin has an amount between 0.3 and 0.3. Melt index between 20g / 10min.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a method for manufacturing a polyolefin release film, which comprises: kneading and gelling a polyolefin composition to form a gelled material; And the gelatinized material is calendered 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 an additive, wherein the polymer Acrylic resins have a melt index between 0.3 and 20.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a thermoplastic polyurethane composite structure including a thermoplastic polyurethane layer; and a polyolefin release film. The polyolefin release film is formed of a polyolefin composition including 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 an additive of 1 to 30 parts by weight, 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 provided by the present invention, a method for manufacturing the same, and a thermoplastic polyurethane composite structure can pass 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 to 20 g / 10 min " The technical solution is to provide a polyolefin release film having excellent tensile strength and elongation, which can be recycled and reused, and which is suitable for thermoplastic polyurethane without using an additional release layer.

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

S‧‧‧thermoplastic polyurethane composite structure

1‧‧‧Polyolefin release film

2‧‧‧ thermoplastic polyurethane layer

41‧‧‧Delivery Station

42‧‧‧ Embossing and Laminating Machine

43‧‧‧curing oven

44‧‧‧ cooling wheel

45‧‧‧ Winder

46‧‧‧ Shower head

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

The following are specific embodiments to explain the embodiments of the "polyolefin release film and its manufacturing method, and thermoplastic polyurethane composite structure" disclosed by the present invention. Those skilled in the art can understand the present invention from the contents 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 based on different viewpoints and applications, and various modifications and changes can be made without departing from the concept of the present invention. In addition, the drawings of the present invention are merely a schematic illustration, 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" as used herein should, depending on the actual situation, include any one or more of the associated listed items.

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

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a processing flow for applying a polyolefin release film according to an embodiment of the present invention to a thermoplastic polyurethane resin. When the polyolefin release film provided by the embodiment of the present invention is used as a release film carrying a thermoplastic polyurethane resin, firstly, the base paper can be sent through the sending station 41 (unwinder), that is, the polyolefin used as the release film The release film 1 is conveyed to an embossing and laminating machine 42 (laminator). Next, in the embossing and bonding stage, the thermoplastic polyurethane resin supplied through the shower head 46 (T-die) and melt-extruded is applied to the surface of the polyolefin release film 1.

Specifically, the thermoplastic polyurethane resin supplied by the shower 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 double-layer structure including the polyolefin release film 1 and the thermoplastic polyurethane resin is transported to a curing oven 43 to dry the thermoplastic polyurethane resin, and then 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 a 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 a method manufactured by the manufacturing method of FIG. 1. Rolled thermoplastic polyurethane composite structure S. 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 in the embodiment of the present invention, no additional release material layer (additional release layer) is used between the polyolefin release film 1 and the thermoplastic polyurethane layer 2. In fact, through the production of the polyolefin composition and the polyolefin release film 1 described below, the production method can be simple, temperature-resistant, stiff, has good flatness, does not delaminate, does not wrinkle, and is waterproof and moisture-proof Polyolefin release film 1 with good properties, good antistatic properties, and good antifouling properties, especially good release properties from 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 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 an additive, wherein the polypropylene resin has Melt index between 0.3 and 20 g / 10 min.

As mentioned above, in order to make the polyolefin release film 1 provided by the present invention suitable for the application of carrying a 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 a functional resin, a filler, and an additive to impart desired characteristics to the manufactured 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 having a low melting point and good ductility may be selected. The melting point of the polypropylene resin may be between 130 and 165 ° C. Specifically, for the application of a thermoplastic polyurethane resin, the present invention selects a polypropylene resin having a melt index in the above specific range as a main component of a polyolefin composition. Considering that the hot-melt extrusion temperature of the thermoplastic polyurethane resin is high, the polyolefin release film 1 used to carry the thermoplastic polyurethane resin must have sufficient temperature resistance. In addition, the use of polypropylene resins with a melt index in the above range is also conducive to processing with a blanket machine. 造 olefin 脱膜 1。 Polyolefin release film 1. However, the invention is not limited to the examples given above.

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

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 high-density polyethylene may not be included in the functional resin, that is, the amount of high-density polyethylene may be zero. The use of the above-mentioned functional resin as a component of the polyolefin composition can make the produced polyolefin release film have good ductility, no delamination, no wrinkle, and easy processing on its surface. However, the invention is not limited to the examples given above.

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 polyolefin release films have higher strength and hardness, or can improve their scratch resistance or heat resistance. In addition, the additive may be a light stabilizer, an ultraviolet absorber, an ethylene vinyl acetate copolymer (EVA), or a vinyl olefin copolymer elastomer. In the present invention, the types of fillers and additives are not limited here, and can be selected and adjusted on the premise that the desired characteristics of the polyolefin release film are achieved.

In the present invention, the polyolefin composition can be kneaded and kneaded by a kneader, and then the rubber particles are calendered by a calender (Calender, also known as a blanket machine) to form a polyolefin release film 1. Next, please refer to FIG. 2. The method for manufacturing the polyolefin release film 1 will be described in detail below. The physical characteristics of the polyolefin release film 1 will be described later.

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

As mentioned above, the polyolefin composition used in step S100 may be the above-mentioned polypropylene resin containing 100 parts by weight, 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. Polyolefin composition. The types and proportions of the components in the polyolefin composition are as described previously. For example, the polypropylene resin may have a melt index between 0.3 and 20 g / min. However, the invention is not limited to the examples given above.

In the embodiment of the present invention, in step S100, 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 by a calender to produce a sheet-shaped material. After the gelatinized material is calendered, the calendered sheet-like material may be further subjected to steps such as stretching, embossing, and surface treatment. For example, by embossing the sheet material, at least one surface of the formed polyolefin release film 1 may have at least one embossment, such as a hairline pattern, a carbon fiber pattern, or the like. In one embodiment of the present invention, the polyolefin release film 1 is a material layer after a corona treatment. However, the invention is not limited to the examples given above.

In other words, in addition to being used to support the thermoplastic polyurethane resin (thermoplastic polyurethane layer 2), the polyolefin release film 1 can also simultaneously transfer the texture of the polyolefin release film 1 to the supported thermoplastic polyurethane by a transfer technology. The surface of layer 2. Therefore, the texture of the surface of the polyolefin release film 1 can be transferred to one surface of the thermoplastic polyurethane layer 2 to form a transfer texture.

According to the needs of different texture transfer, an appropriate embossing wheel set can be selected to produce polyolefin release films 1 with different textures whose surface can be atomized or brightened. For example, according to different demand characteristics, you can use special ON-LINE embossing (for example, 490 leather pattern, 113L carbon fiber pattern, 463 fine mist pattern, 001 mirror pattern, cloth pattern 1071 Cloth pattern 1073, rough pattern 005, etc.), so that the polyolefin release film 1 has different appearance and surface characteristics. In this way, in addition to giving the thermoplastic polyurethane layer 2 with a specific texture, it is also possible to achieve the effect of sticking to the thermoplastic polyurethane layer 2 without using additional materials such as an anti-adhesive (such as a release resin). However, the invention is not limited to the examples given above.

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, a polyolefin release film 1 having the following characteristics can be obtained by appropriately adjusting the components of the polyolefin composition and related characteristics (for example, the melt index). In addition, as described 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 between 0.08 and 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 have a longitudinal elongation of at least 200% and a lateral elongation of at least 40%. In one embodiment of the present invention, the polyolefin release film 1 has a longitudinal elongation of 400% or more and a lateral elongation of at least 100%.

Specifically, the polyolefin release film 1 having the above characteristics has excellent mechanical strength and ductility. In this way, when it is used to carry a thermoplastic polyurethane extruded at high temperature, it can ensure the temperature resistance and stiffness of the product. And flatness, and when the thermoplastic polyurethane layer 2 needs to be separated from the polyolefin release film 1, it provides excellent anti-peelability, that is, the thermoplastic polyurethane layer 2 can be peeled from the polyolefin release film 1 as required.

Specific experimental examples

In the following, the polyolefin release film 1 provided by one of the embodiments of the present invention is taken as an example to show the characteristics obtained through the test of the polyolefin release film 1 provided by the present invention.

Table 1 lists the characteristics of one of the polyolefin release films 1 according to the present invention, and the characteristics standards that have been tested and can be well applied to support the thermoplastic polyurethane layer 2. In Table 1, the thickness of the polyolefin release film 1 is 0.15 mm, and its surface is matte. It can be known from the contents of Table 1 that the polyolefin release film 1 provided by the present invention is well applicable to the technical application of the thermoplastic polyurethane resin.

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

Table 2 lists the characteristics of another polyolefin release film 1 according to the present invention, and the performance standards that have been tested and are well suited for carrying a thermoplastic polyurethane layer 2. In Table 2, the thickness of the polyolefin release film 1 is 0.15 mm, and the surface thereof is a bright surface. It can be known from the contents of Table 1 that the polyolefin release film 1 provided by the present invention is well applicable to the technical application of the thermoplastic polyurethane resin.

[Advantageous Effects of the Embodiment]

One of the beneficial effects of the present invention is that the polyolefin release film 1 provided by the present invention 1, a manufacturing method thereof, and a thermoplastic polyurethane composite structure S, can pass 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 an additive "and a technical solution of" a polypropylene resin having a melt index between 0.3 and 20 g / 10 min "to provide It has excellent tensile strength and elongation, can be recycled and reused, and can be applied to a thermoplastic polyurethane polyolefin release film 1 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 group distribution ratio. In addition, according to the product requirements, it can also be processed through different surface treatment steps (such as using different Embossing wheel set) to impart different surface characteristics (embossing, surface tension, roughness, etc.) to the surface of the polyolefin release film 1. 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 flatness, solid material without delamination, no wrinkles, and waterproof. It has good moisture resistance, good antistatic properties, good antifouling properties, and has a variety of grain structures, especially with the advantages of proper adhesion and good release and peel resistance to the thermoplastic polyurethane layer 2.

The contents disclosed above are only the preferred and feasible embodiments of the present invention, and therefore do not limit the scope of patent application of the present invention. Therefore, any equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. Within the scope of the patent.

Claims (10)

A polyolefin release film for supporting a thermoplastic polyurethane and formed of a polyolefin composition including 100 parts by weight of a polypropylene resin and 1 to 100 parts by weight of a functionality Resin, 5 to 150 parts by weight of a filler, and 0.1 to 30 parts by weight of an additive, wherein the polypropylene resin has a melt index between 0.3 to 20 g / 10 min. 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 includes at least one of a high density polyethylene, a linear low density polyethylene, and a low density polyethylene, and the high density Polyethylene has a melt index between 0.2 and 30. The polyolefin release film according to claim 1, wherein the additives include 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 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 longitudinal elongation of at least 200% and a lateral 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 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 an additive, wherein the polypropylene resin has a value between 0.3 A melt index between 20 and 20; and calendering the gelled material through a blanket machine to form the polyolefin release film. A thermoplastic polyurethane composite structure 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 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 an additive, wherein the polypropylene resin has a content between 0.3 and 20 Melt index; wherein the thermoplastic polyurethane layer is directly coated on one surface of the polyolefin release film. The thermoplastic polyurethane composite structure according to claim 9, 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. A transfer pattern is formed.