KR20200064758A - Sheet for protecting paint films of automobiles and method for preparing thereof - Google Patents

Abstract

Provided is a sheet for automobile coat protection, which comprises a hard coating layer and a base layer, wherein the base layer is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin, and an olefin-based resin.

Description

Protective sheet for automobile coating film and manufacturing method therefor{SHEET FOR PROTECTING PAINT FILMS OF AUTOMOBILES AND METHOD FOR PREPARING THEREOF}

The present invention relates to a protective sheet for automobile coatings and a method for manufacturing the same.

The protective film for automobile coating is used to prevent the coating of automobiles and automobile parts from being damaged and discolored by various floating materials and collision materials, for example, dirt, dust, acid rain, gravel, etc., on the painted automobile.

Automobiles have a complex shape in three dimensions, and a sheet for protecting a coating film of automobiles is required to exhibit excellent moldability for a complex shape in three dimensions, such as a curved surface. In addition, when a damage such as scratching occurs, the seat for protecting a vehicle needs elastic resilience that is gradually cured or reduced by itself.

On the other hand, in the case of a sheet having an elongation and/or elastic restoring force, there is a problem that mechanical properties such as strength are insufficient.

An object of the present invention is to provide a sheet for protecting automotive coatings including a base layer having excellent elongation and tensile strength and exhibiting excellent anti-chipping.

In addition, an object of the present invention is to provide a method for manufacturing a sheet for protecting an automobile coating film.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by embodiments of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.

A hard coat layer and a base layer according to the present invention, the base layer can provide a sheet for protecting automotive coatings, which is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin and an olefin-based resin.

In addition, the step of manufacturing a base layer which is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, styrene-based petroleum resin and olefin-based resin according to the present invention; And forming a hard coating layer by applying a hard coating layer composition to one surface of the substrate layer.

The sheet for protecting an automobile coating film according to the present invention includes a hard coating layer and a base layer, and the base layer has excellent elongation and elastic resilience, and at the same time, has excellent tensile strength and can exhibit excellent chipping resistance. In addition, the substrate layer may exhibit excellent weatherability while maintaining excellent glossiness.

In addition, the method for manufacturing a protective sheet for automobile coatings according to the present invention may include the base layer having excellent physical properties.

In addition to the above-described effects, the concrete effects of the present invention will be described together while describing the specific matters for carrying out the invention.

1 schematically shows a cross-section of a sheet according to an embodiment of the present invention.
Figure 2 schematically shows a cross-section of a sheet according to another embodiment of the present invention.

The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, and accordingly, a person skilled in the art to which the present invention pertains can easily implement the technical spirit of the present invention. In the description of the present invention, when it is determined that detailed descriptions of known technologies related to the present invention may unnecessarily obscure the subject matter of the present invention, detailed descriptions will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings are used to indicate the same or similar components.

In the following, the arrangement of any component in the "upper (or lower)" or "upper (or lower)" of the component means that the arbitrary component is disposed in contact with the upper surface (or lower surface) of the component. In addition, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Hereinafter, it will be described according to the embodiment of the present invention.

In one embodiment of the present invention, including a hard coating layer and a base layer, the base layer provides a sheet for protecting automotive coatings, which is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin and an olefin-based resin. do.

The protective film for automobile coating film protects the coating film of a car that has been painted from mechanical, physical, and chemical influences from the outside, and is used in automobiles having a complex shape in three dimensions. Accordingly, it is required that the sheet for protecting an automobile coating film protects the automobile coating film from scratches and tears due to gravel, etc., while simultaneously exhibiting excellent elongation.

On the other hand, when using a vinyl chloride resin as a base material, there is a problem that the surface of the car is torn and torn due to poor elastic resilience and chipping resistance. And, when using a thermoplastic polyurethane (Thermoplastic PolyUrethane) having a good elasticity as a base material, there was a problem that the moldability is poor and it is difficult to mold an automobile part having a complicated three-dimensional shape such as bending.

1 schematically shows a cross-section of a sheet 100 for protecting an automobile coating film according to an embodiment of the present invention. The sheet includes a hard coating layer 20 formed on one surface of the base layer 10. At this time, the base layer is an extruded sheet formed from a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin, and an olefin-based resin, having excellent elongation and elastic resilience, and at the same time having excellent tensile strength and excellent chipping resistance Can represent In addition, the substrate layer may exhibit excellent weatherability while maintaining excellent glossiness.

The substrate layer composition may include a styrene-based thermoplastic elastomer, and impart improved elongation and elasticity to the substrate layer, that is, excellent moldability and elastic recovery.

Specifically, the styrene-based thermoplastic elastomer is a copolymer of styrene and diene, and may be a block copolymer of at least a triblock including hard segments and soft segments. More specifically, the styrene-based thermoplastic elastomer is styrene-ethylene-ethylenepropylene-styrene (SEEPS), styrene-ethylenepropylene-styrene (SEPS), styrene-ethylenebutylene-styrene (SEBS), styrene-ethylenebutylene-styrene -Ethylenebutylene (SEBSEB), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), styrene-isoprene-butadiene-styrene (SIBS), styrene-ethylenepropylene-styrene-ethylenepropylene (SEPSEP) and It may include one selected from the group consisting of these combinations.

The styrene-based thermoplastic elastomer may include about 10% to about 40% by weight of styrene. The styrene-based thermoplastic elastomer comprises about 10% to about 40% by weight, or about 15% to about 30% by weight of the styrene block constituting the hard segment relative to 100 parts by weight of the styrene-based thermoplastic elastomer, and has excellent elongation and elasticity. It can impart improved strength along with resilience. For example, when the content of the styrene is less than the above range, not only the initial strength, but also the strength of the entire base layer is too low, the base layer is easily deformed, and the chipping resistance may be deteriorated due to weak external impact. And, when the content of the styrene exceeds the above range, the elongation falls, the strength is too high, the workability of the film may be deteriorated. Accordingly, when the film is applied to a severely bent portion, the elasticity and strength of the film may be excessively higher than the adhesive property of the pressure-sensitive adhesive, thereby causing the film to be lifted from the construction surface.

The base layer composition may include the styrene-based thermoplastic elastomer in an amount of about 30 parts by weight to about 70 parts by weight relative to 100 parts by weight of the base layer composition. When the content of the styrene-based thermoplastic elastomer is less than the above range, elongation and elastic restoring power may be low, chipping resistance may be deteriorated, and moldability and workability of the automotive coating film protective sheet including the base layer may deteriorate. have. And, when the content of the styrene-based thermoplastic elastomer exceeds the above range, the elongation may be high, but the strength is too low, there is a problem that the chipping resistance is poor.

The base layer composition may include a styrene-based petroleum resin to the styrene-based thermoplastic elastomer, and impart excellent tensile strength to the base layer while maintaining excellent elasticity. Styrene-based thermoplastic elastomer may impart excellent elongation and elasticity to the base layer, but there is a problem in that the strength is poor. For example, a styrene-based thermoplastic elastomer may exhibit only about 1/6 of the strength of a thermoplastic polyurethane (Thermoplastic PolyUrethane).

The styrene-based petroleum resin can reinforce the styrene constituting the hard segment in the styrene-based thermoplastic elastomer, while maintaining excellent elongation and elasticity, while providing excellent strength and exhibiting excellent chipping resistance.

The styrene-based petroleum resin may be a polymer of a monomer selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, indene, methylindene, and combinations thereof.

The styrene-based petroleum resin may have a weight average molecular weight of about 1,000 g/mol to about 22,000 g/mol, for example, the styrene-based petroleum resin may have a weight average molecular weight of about 4,500 g/mol to about 15,000 g/mol. Can be The base layer may include a styrene-based petroleum resin having a weight average molecular weight in the above range, while providing improved strength, preventing stickiness from increasing, and improving workability. The glass transition temperature (Tg) of the styrene-based petroleum resin may be about 40 ℃ to about 95 ℃.

The styrene-based petroleum resin may be included in an amount of about 30 parts by weight to about 80 parts by weight compared to 100 parts by weight of the styrene-based thermoplastic elastomer. The base layer may include the styrene-based petroleum resin in the above range, while maintaining excellent elongation and elasticity, and at the same time, providing excellent strength, and preventing adhesion from becoming too high, thereby exhibiting excellent workability.

The base layer composition includes an olefin-based resin that exhibits excellent compatibility with the styrene-based thermoplastic elastomer, exhibits excellent compatibility with the styrene-based thermoplastic elastomer, and has excellent tensile strength and chipping resistance to the base layer while maintaining excellent elasticity. Can be given a surname.

Specifically, the olefin-based resin is a homopolymer, a block polymer or a polypropylene polymer in the form of a random polymer; Ethylene polymers such as low density polyethylene, high density polyethylene or linear low density polyethylene; Ethylene-propylene copolymer and combinations thereof.

The melting index of the olefin-based resin (ASTM-D-1238, L condition, 230°C) may be 2 g/10 min to 10 g/10 min, specifically 5 g/10 min to 8 g/10 min. The base layer may include the olefin-based resin having a melt index in the above range, while maintaining elongation and elasticity of the styrene-based thermoplastic elastomer, exhibit excellent processability, improve strength, and exhibit excellent chipping resistance. Specifically, when the melt index of the olefin-based resin is less than the above range, the workability is significantly reduced, there may be a problem that does not improve the strength. And, when it exceeds the above range, the strength increases, but the elastic force of the base layer is greatly reduced, so that the restoring force of the base layer may be deteriorated. In addition, when the melt index exceeds the above range, the glass transition temperature of the base layer composition increases, and upon strong impact at low temperature, the base layer may break and chipping resistance of the base layer may deteriorate.

The olefin-based resin does not impart elasticity such as an elastomer, and may be included in an amount of about 5 parts by weight to about 70 parts by weight compared to 100 parts by weight of the styrene-based thermoplastic elastomer. Specifically, as described below, when irradiating an electron beam to the base layer, the base layer composition may include about 5 parts by weight to about 15 parts by weight of the olefin-based resin relative to 100 parts by weight of the styrene-based thermoplastic elastomer. . In addition, when formed on the substrate layer without electron beam irradiation, the olefin-based resin may contain about 20 parts by weight to about 70 parts by weight relative to 100 parts by weight of the styrene-based thermoplastic elastomer. The base layer may include the olefin-based resin in an amount in the above range, while maintaining excellent elongation and elasticity, while simultaneously providing excellent strength. Specifically, when the content of the olefin-based resin is less than the above range, the strength is lowered, and the base layer may be too soft. If it exceeds the above range, the elastic recovery force of the base layer is lowered and chipping is not performed. There may be an improvement problem.

The base layer composition comprising the styrene-based thermoplastic elastomer, the styrene-based petroleum resin, and the olefin-based resin may not contain oil. In general, in preparing an extrudate by mixing and extruding the raw materials, it is possible to improve the extrusion flowability of the raw materials by including oil in the composition. However, when oil is included in the base layer of the automotive film protective sheet, there may be a problem that the strength is lowered. The base layer composition does not contain oil, and can maintain excellent elongation and elasticity while simultaneously providing excellent strength.

The base layer composition may further include one additive selected from the group consisting of UV stabilizers, thermal stabilizers and combinations thereof. And, the base layer composition may include the additive in an amount of about 0.1% to about 5% by weight.

Specifically, the base layer composition may further impart excellent weather resistance by further including one UV stabilizer selected from the group consisting of triazole-based, triazine-based, and combinations thereof. Accordingly, even after a long time has passed, UV can be absorbed with excellent efficiency to provide excellent weather resistance.

In addition, the base material layer composition may include a heat stabilizer to prevent the physical properties of the base material layer from deteriorating in the process of manufacturing a sheet for protecting automotive coatings.

The glass transition temperature (Tg) of the base layer composition comprising the styrene-based thermoplastic elastomer, the styrene-based petroleum resin, and the olefin-based resin may be about -40°C to about 40°C, specifically -40°C to about 20°C Can be. The base layer composition does not contain oil or the like, and exhibits a glass transition temperature in the above range, and thus can exhibit excellent mixing and extrusion flowability. Accordingly, the base layer of the sheet for protecting an automotive coating film, which is an extruded sheet of the base layer composition, can provide excellent strength while maintaining excellent elongation and elasticity without deteriorating physical properties. And, it can exhibit excellent chipping resistance, and excellent weatherability while maintaining excellent glossiness.

The substrate layer may have an elongation of about 350% to about 500% according to ASTM D638-95, specifically, an elongation of about 400% to about 500%. In general, in a multi-layered sheet including a hard coating layer and a base layer, deterioration occurs in the base layer by heat applied in the process of applying the hard coating layer composition to the base layer and forming the hard coating layer, thereby deteriorating physical properties. In addition, swelling may occur in the base layer by a solvent used to apply the hard coating layer composition, thereby deteriorating physical properties of the base layer. Specifically, when the hard coating layer is placed on the base layer, the elongation of the base layer itself may be reduced by about 50%, and accordingly, there may be a problem in that the workability of the multi-layer sheet including the hard coating layer and the base layer is significantly reduced.

The automotive film protective sheet includes a hard coating layer and a base layer, and may be suitable for use as a sheet for protecting the interior and exterior materials of a vehicle having a complicated three-dimensional shape such as bending, including a base layer having an elongation in the above range. . Specifically, when the elongation of the base layer is less than the above range, the overall elongation of the multi-layer sheet including the hard coating layer and the base layer is too low, so there may be a problem in that the workability is significantly reduced. In addition, when the elongation of the base layer exceeds the above range, the base layer is made very soft, the strength is low, and chipping resistance, which is a protection ability against external impact, may be deteriorated.

In addition, the base layer may have a tensile strength according to ASTM D638-95 of about 30Mpa to about 60Mpa, specifically, about 40Mpa to about 50Mpa. The sheet for protecting an automotive coating film includes a base layer having a tensile strength in the above range to protect a coating film of an automotive interior and exterior material, and may exhibit excellent chipping resistance and weather resistance.

The thickness of the base layer may be about 80㎛ to about 300㎛. The sheet for protecting automotive coatings includes a base layer having a thickness in the above range, serves as a support, and maintains excellent gloss while protecting the coatings of automobile interior and exterior materials from external impacts such as scratches, stone bumps, and contact accidents. , Can show excellent weather resistance.

The automotive film protection sheet is a multi-layer sheet in which a hard coating layer and the base layer are sequentially stacked from the top, including the hard coating layer on one surface of the base layer to primarily protect the coating from mechanical, physical, and chemical influences from the outside. can do.

The hard coating layer may include a urethane-based resin, and may exhibit contamination resistance, chemical resistance, and scratch resistance. In addition, the hard coating layer may have a thickness of about 3 μm to about 40 μm to sufficiently sufficiently protect the coating from mechanical, physical, and chemical influences from the outside.

The base layer exhibits excellent adhesion in relation to the hard coating layer, and does not deteriorate the properties of each layer without deteriorating with excellent adhesion in the process of molding a protective sheet on the coating film of automobile interior and exterior materials or during long-term use. Can stay above the level.

2 schematically shows a cross-section of a sheet 200 for protecting an automobile coating film according to another embodiment of the present invention. Referring to FIG. 2, the automotive film protective sheet 200 includes a base layer 10 and a hard coating layer 20 formed on one surface of the base layer 10, and on another surface of the base layer 10 The adhesive 30 and release paper 40 may be further included.

The automotive film protective sheet 200 can be used after removing the release paper on the surface of the interior or exterior materials of automobiles or various plastic products to be protected from damage due to mechanical, physical, and chemical effects from the outside.

In another embodiment of the present invention, there is provided a method for manufacturing a sheet for protecting an automobile coating film. Specifically, preparing a base layer that is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin, and an olefin-based resin; And forming a hard coating layer by applying a hard coating layer composition to one surface of the base layer. Matters regarding the base layer composition are as described above.

The base layer may be prepared in a form of pellets by melt-kneading the base layer composition with an extruder, and then extruding the pellets into a sheet.

In addition, in the method for manufacturing a sheet for protecting an automotive coating film, the extrusion sheet may further include a step of manufacturing a substrate layer by irradiating an electron beam.

The substrate layer may be irradiated with an electron beam of about 25 kGy to about 300 kGy to increase the degree of crosslinking of the extruded sheet and to improve mechanical properties such as tensile strength, heat resistance and weather resistance.

In addition, when the substrate layer is formed by irradiating the electron beam to the extruded sheet, the content of the olefin-based resin in the substrate layer composition can be reduced, and accordingly, the elastic recovery force and chipping resistance can be further improved. Specifically, as the olefin-based resin does not have elasticity, when the content of the olefin-based resin is increased to improve strength, elasticity may be relatively reduced. The base layer has a sufficient elastic restoring power, including a small amount of olefin-based resin, and can exhibit sufficient strength by controlling the degree of crosslinking with an electron beam. For example, the base layer composition may include about 5 parts by weight to about 15 parts by weight of the olefin-based resin compared to 100 parts by weight of the styrene-based thermoplastic elastomer.

(Example)

Example 1:

Styrene-ethylene propylene-styrene (SEPS) containing 18% by weight of styrene monomer and 40 parts by weight of random polypropylene compared to 100 parts by weight of the styrene-ethylene propylene-styrene (SEPS) and α-methyl having a weight average molecular weight of 10,000 g/mol A mixture was prepared by mixing 60 parts by weight of styrene and styrene-based petroleum resin, which is a copolymer of styrene, and a base layer composition having a glass transition temperature of -28°C by including an additive containing an antioxidant and a UV stabilizer in the mixture.

At this time, the styrene-ethylene propylene-styrene (SEPS) was to be included in an amount of about 50 parts by weight compared to 100 parts by weight of the substrate layer composition, the substrate layer composition was not to contain oil.

Subsequently, the base layer composition was melt-kneaded at 170°C to 240°C with a Tiwn extruder (Bautech) to prepare pellets, and the pellets were single extruded from 200°C to 270°C T-die casting (Bautech) ) To form a 150 µm thick sheet to obtain a base layer sheet.

And, by coating a hard coating composition comprising a polyurethane on the base layer sheet to prepare a multilayer sheet for automotive coating film protection.

Example 2:

Styrene-ethylene propylene-styrene (SEPS) containing 18% by weight of styrene monomer and 10 parts by weight of random polypropylene compared to 100 parts by weight of the styrene-ethylene propylene-styrene (SEPS) and α-methyl having a weight average molecular weight of 10,000 g/mol A mixture was prepared by mixing 60 parts by weight of styrene and styrene-based petroleum resin, which is a copolymer of styrene, and a base layer composition having a glass transition temperature of -25°C by including an additive containing an antioxidant and a UV stabilizer in the mixture.

At this time, the styrene-ethylene propylene-styrene (SEPS) was to be included in an amount of 55 parts by weight compared to 100 parts by weight of the base layer composition, the base layer composition was not to contain oil.

Subsequently, the base layer composition was melt-kneaded at 170°C to 240°C with a Tiwn extruder (Bautech) to prepare pellets, and the pellets were single extruded from 200°C to 270°C T-die casting (Bautech) ) After forming into a 150 μm thick sheet using the method, the substrate layer was irradiated with electron beam of about 100 kGy with 1 Mev (Mega electron volt) energy, 18 mA condition, and process line speed of 10 m/min on the sheet. Sheets were obtained.

And, by coating a hard coating composition comprising a polyurethane on the base layer sheet to prepare a multilayer sheet for automotive coating film protection.

Comparative Example 1:

Styrene-ethylene propylene-styrene (SEPS) containing 18% by weight of styrene monomer and 40 parts by weight of random polypropylene compared to 100 parts by weight of styrene-ethylenepropylene-styrene (SEPS) are mixed to prepare a mixture, and an antioxidant is added to the mixture. And a substrate layer composition having a glass transition temperature of -34°C, including an additive including a UV stabilizer, was prepared in the same manner as in Example 1 to prepare a substrate layer sheet and a multilayer sheet for protecting automotive coatings.

Comparative Example 2

Styrene, a copolymer of α-methylstyrene and styrene having a weight average molecular weight of 10,000 g/mol compared to 100 parts by weight of styrene-ethylene propylene-styrene (SEPS) and styrene-ethylene propylene-styrene (SEPS) containing 18% by weight of styrene monomer A mixture was prepared by mixing 60 parts by weight of a petroleum-based resin, and a base layer composition having a glass transition temperature of -41°C was prepared by including an additive containing an antioxidant and a UV stabilizer in the mixture.

A base layer sheet and a multilayer sheet for protecting automotive coatings were prepared in the same manner as in Example 1, except that the base layer composition was prepared.

evaluation

Experimental Example One: Elongation And tensile strength

The base layer sheets of the Examples and Comparative Examples were prepared as specimens of 10 mm (W, width) Х 120 mm (L. length x 0.15 mm (T, thickness)), and dogbones with KSM3507 No. 1 mold for the specimens Samples were taken and the maximum load and elongation at break for a certain area were measured using Zwick Roell's Z 1000 model UTM equipment according to ASTM D638-95 at a speed of 300 mm/min and a distance between marks of 40 mm. The results are shown in Table 1 below.

Experimental Example 2: Elastic resilience

The base layer sheets of the examples and comparative examples were prepared as specimens of 10 mm (W, width) x 120 mm (L, length) x 0.15 mm (T, thickness). And, using the Zwick Roell Z 1000 model UTM equipment with respect to the specimen, according to the ASTM D638-95 standard, the speed 300 mm / min, the distance between the marks increased by 100% under the condition of 40 mm distance after the substrate returns to its original state Was measured. The results are shown in Table 1 below. The measured value (elastic resilience) was converted into a percentage of the length increased compared to the initial length.

Experimental Example 3: Chipping resistance

The base layer sheets of the examples and comparative examples were prepared as specimens of 150 mm (W, width) x 75 mm (L, length) x 150 µm (T, thickness). An acrylic adhesive was applied to a paint plate for automobiles painted on an iron plate, and the specimen was attached. And, in order to evaluate the chipping resistance of the base layer sheet, after leaving the sheet surface at -30°C for 6 hours, after tilting the specimen about 45 degrees, water-worn road gravel (diameter: 9.5 mm to 16) mm, 700 g, about 250 to 300 pieces) was applied with a constant force (about 491 kPa) for about 3 seconds, and it was visually confirmed whether tearing or tearing occurred on the surface of the base layer sheet or on the coating plate. Then, the number of tears or tears on the surface of the substrate layer sheet or the coating plate was measured and evaluated according to the following evaluation criteria, and the results are shown in Table 1 below.

(Evaluation standard)

O: 5 or less

X: more than 5

Tensile strength (MPa) Elongation (%) Elastic resilience Chipping resistance Example 1 42 450 90% O Example 2 41 430 95% O Comparative Example 1 28 300 75% X Comparative Example 2 32 420 93% X

As shown in Table 1, it can be seen that the base layer sheet prepared in the example exhibits excellent tensile strength and chipping resistance while having excellent elongation and elastic restoring force. On the other hand, it can be seen that the sheet of the comparative example does not exhibit excellent physical properties, particularly elongation and elastic resilience, and excellent tensile strength and excellent chipping resistance.

As described above, the present invention has been described with reference to the exemplified drawings, but the present invention is not limited by the examples and drawings disclosed in the present specification, and can be varied by those skilled in the art within the scope of the technical idea of the present invention. It is obvious that modifications can be made. In addition, although the operation and effect according to the configuration of the present invention has not been explicitly described while explaining the embodiment of the present invention, it is natural that the effect predictable by the configuration should also be recognized.

100, 200: automobile film protection sheet
10: base layer
20: hard coating layer
30: adhesive
40: release paper

Claims (14)

It includes a hard coating layer and a base layer,
The base layer is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin and an olefin-based resin.
Protective sheet for automotive coatings.
According to claim 1,
The styrenic thermoplastic elastomer is It is a copolymer of styrene and diene, styrene-ethylene-ethylenepropylene-styrene (SEEPS), styrene-ethylenepropylene-styrene (SEPS), styrene-ethylenebutylene-styrene (SEBS), styrene-ethylenebutylene-styrene-ethylene Butylene (SEBSEB), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS), styrene-isoprene-butadiene-styrene (SIBS), styrene-ethylenepropylene-styrene-ethylenepropylene (SEPSEP) and their Containing one selected from the group consisting of combinations
Protective sheet for automotive coatings.
According to claim 1,
The styrene-based thermoplastic elastomer comprises 10% to 40% by weight of styrene
Protective sheet for automotive coatings.
According to claim 1,
The content of the styrene-based thermoplastic elastomer is 30 parts by weight to 70 parts by weight compared to 100 parts by weight of the base layer composition
Protective sheet for automotive coatings.
According to claim 1,
The styrene-based petroleum resin is a polymer of a monomer selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, indene, methylindene, and combinations thereof.
Protective sheet for automotive coatings.
According to claim 1,
The weight average molecular weight of the styrene-based petroleum resin is 1,000g / mol to 22,000 g / mol phosphorus
Protective sheet for automotive coatings.
According to claim 1,
The content of the styrene-based petroleum resin is 30 parts by weight to 80 parts by weight compared to 100 parts by weight of the styrene-based thermoplastic elastomer.
Protective sheet for automotive coatings.
According to claim 1,
The content of the olefin-based resin is 5 parts by weight to 70 parts by weight compared to 100 parts by weight of the styrene-based thermoplastic elastomer
Protective sheet for automotive coatings.
According to claim 1,
The substrate layer composition has a glass transition temperature (Tg) of -40°C to 20°C
Protective sheet for automotive coatings.
According to claim 1,
The base layer composition does not contain oil
Protective sheet for automotive coatings.
According to claim 1,
The base layer has a tensile strength of 30Mpa to 60Mpa according to ASTM D638-95
Protective sheet for automotive coatings.
According to claim 1,
The substrate layer has an elongation according to ASTM D638-95 of 350% to 500%.
Protective sheet for automotive coatings.
Preparing a base layer that is an extruded sheet of a base layer composition comprising a styrene-based thermoplastic elastomer, a styrene-based petroleum resin, and an olefin-based resin; And
Including the step of forming a hard coating layer by applying a hard coating layer composition on one surface of the base layer
Method for manufacturing a sheet for protecting automotive coatings.
The method of claim 13,
Producing a substrate layer by irradiating the extruded sheet with an electron beam
Method for manufacturing a sheet for protecting automotive coatings.

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