JP2017197639A - Surface protective film and method for producing the same and floor material obtained by laminating the surface protective film on outermost surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface protective film which is excellent in weather resistance, is excellent in abrasion resistance, reduces smoke emission at the time of film molding, and is excellent in film-forming property of the film and a method for producing the same, and to provide a floor material obtained by laminating the surface protective film on an outermost surface.SOLUTION: A surface protective film contains a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, where a polyolefin resin is a polypropylene resin, a melt flow rate of the polypropylene resin is 1 g/10 min to 20 g/10 min, a weight decreasing start temperature of the benzotriazole ultraviolet absorber is 150°C or higher, a weight decreasing start temperature of the hindered amine light stabilizer is 150°C or higher, a ratio of the benzotriazole ultraviolet absorber and the hindered amine light stabilizer is 1:1 to 1:10 in a weight ratio, and a thickness is 0.1 mm to 2.0 mm.SELECTED DRAWING: None

Description

   The present invention relates to a surface protection film for a flooring material that is suitably used as a flooring material for buildings such as buildings, condominiums, houses, commercial facilities, etc., or a flooring material for vehicles such as railways and buses.

  In the present specification and claims, the term “weight reduction start temperature” refers to a test piece measured under conditions of nitrogen and a heating rate of 20 ° C./min in accordance with JIS K7120-1-1987. It means the temperature at which mass change begins.

  In the present specification and claims, the term “melt flow rate” means a melt flow rate measured at a temperature of 230 ° C. and a load of 2.16 kg in accordance with JIS K7210-1999.

  Conventionally, a surface protective film used for building materials, furniture, flooring, etc. has been required to have excellent weather resistance, and is a surface protective film made of a vinyl chloride resin (PVC) containing a large amount of a plasticizer. Is often adopted.

  However, since the PVC surface protective film generates a toxic gas such as hydrogen chloride together with a large amount of smoke during combustion, problems such as disaster prevention such as evacuees inhaling the toxic gas during a fire, In addition, there is a problem of causing environmental pollution by incineration disposal. Further, since the PVC surface protective film contains a large amount of plasticizer, it has a peculiar odor, and the odor caused by such a plasticizer is also said to be one of the causes of sick house syndrome. In addition, there is a problem that the plasticizer is reduced in volatility due to long-term use and the flexibility as a flooring material is lowered, and the plasticizer bleeds on the surface due to long-time use, and it tends to cause fogging and the appearance appearance is deteriorated. .

  Therefore, in recent years, various surface protective films using polyolefin-based resins that generate less harmful gas during combustion have been developed instead of PVC materials.

For example, Patent Document 1 proposes a soft polypropylene resin composition obtained by blending a hindered amine light stabilizer with a soft polypropylene resin. It is a surface protective film made of a polyolefin resin, and can be suitably used as a surface protective film for building materials, furniture and the like.
JP-A-10-101866

  However, in patent document 1, since it consists of a soft polypropylene-type resin composition, when it is used as a surface protection film for flooring use, it does not necessarily satisfy abrasion. Furthermore, in Patent Document 1, since a soft polypropylene resin composition formed by blending a hindered amine light stabilizer at 270 ° C. using a T die extruder is formed into a film, an eye strain occurs in the T die extruder. In particular, there is a problem that a lot of smoke is generated during the molding process, and the cleanliness of the working environment is lowered. In order to solve this problem, if the temperature of the T-die extruder is lowered, smoke generation during the molding process can be suppressed, but the film-forming property of the film during the molding process deteriorates, and the film can be molded uniformly. There is a risk of disappearing.

  The present invention has been made in view of such technical background, and of course has excellent weather resistance, as well as excellent wear resistance required for flooring applications, and smoke generation during film forming processing. The object of the present invention is to provide a surface protective film that is excellent in film formability even when the processing temperature is lowered, a method for producing the same, and a flooring having the surface protective film laminated on the outermost surface.

   In order to achieve the above object, the present invention provides the following means.

[1] A surface protective film containing a polyolefin resin, comprising a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, wherein the polyolefin resin is a polypropylene resin, The melt flow rate is 1 g / 10 min to 20 g / 10 min, the weight loss starting temperature of the benzotriazole UV absorber is 150 ° C. or higher, and the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. or higher. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer is 1: 1 to 1:10 by weight, and the thickness of the surface protective film is 0.1 mm to 2.0 mm. Characteristic surface protective film.

[2] The benzotriazole ultraviolet absorber is 0.05 to 2.0 parts by mass with respect to 100 parts by mass of the polypropylene resin, and the hindered amine light stabilizer is with respect to 100 parts by mass of the polypropylene resin. 2. The surface protective film as described in 1 above, which is 0.1 to 4.0 parts by mass.

[3] A flooring in which the surface protective film according to 1 or 2 is laminated on the outermost surface.

[4] A method for producing a surface protective film containing a polyolefin resin, comprising a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, wherein the polyolefin resin is a polypropylene resin, The melt flow rate of the polypropylene resin is 1 g / 10 min to 20 g / 10 min, the weight loss starting temperature of the benzotriazole ultraviolet absorber is 150 ° C. or higher, and the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. The ratio of the benzotriazole ultraviolet absorber and the hindered amine light stabilizer is 1: 1 to 1:10 by weight, and the thickness of the surface protective film is 0.1 mm to 2.0 mm. There is provided a method for producing a surface protective film, which is molded at a temperature of 210 ° C to 250 ° C.

  In the invention of [1], the surface protective film contains a polyolefin-based resin, which contains a benzotriazole-based ultraviolet absorber and a hindered amine-based light stabilizer, and the benzotriazole-based ultraviolet absorber and the hindered amine-based light. Since the ratio of the stabilizer is 1: 1 to 1:10 by weight, the weather resistance is excellent. Since the polyolefin-based resin is a polypropylene resin and the thickness of the surface protective film is 0.1 mm to 2.0 mm, the wear resistance is excellent. Since the weight loss starting temperature of the benzotriazole-based ultraviolet absorber is 150 ° C. or higher and the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. or higher, the occurrence of smoke generation during film forming can be reduced. Furthermore, since the melt flow rate of the polypropylene resin is 1 g / 10 min to 20 g / 10 min, a surface protective film excellent in film formability can be obtained.

  In the invention of [2], the benzotriazole-based UV absorber is 0.05 to 2.0 parts by mass with respect to 100 parts by mass of the polypropylene resin, and the hindered amine-based light stabilizer is with respect to 100 parts by mass of the polypropylene resin. Since it is 0.1 mass part-4.0 mass parts, a weather resistance can be improved further.

  In the invention of [3], since it is a flooring material having a surface protective film laminated on the outermost surface, it is possible to obtain a flooring material that is excellent in weather resistance and excellent in abrasion even when used in flooring applications.

  The invention of [4] is a method for producing a surface protective film containing a polyolefin resin, comprising a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, and a benzotriazole ultraviolet absorber; Since the ratio of the hindered amine light stabilizer is 1: 1 to 1:10 by weight, the weather resistance is excellent. Since the polyolefin-based resin is a polypropylene resin and the thickness of the surface protective film is 0.1 mm to 2.0 mm, the wear resistance is excellent. Since the weight loss starting temperature of the benzotriazole ultraviolet absorber is 150 ° C. or higher and the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. or higher, it is possible to reduce the occurrence of smoke generation during film forming processing. The generation of smoke generation can be further reduced by molding at a temperature of 210 ° C to 250 ° C. Furthermore, since the melt flow rate of the polypropylene resin is 1 g / 10 min to 20 g / 10 min, even if the processing temperature is 210 ° C. to 250 ° C., a surface protective film having excellent film formability can be obtained. .

An embodiment of the surface protective film according to the present invention will be described. The surface protective film of this embodiment is a surface protective film containing a polyolefin resin, and contains a benzotriazole ultraviolet absorber and a hindered amine light stabilizer,
The polyolefin resin is a polypropylene resin, the melt flow rate of the polypropylene resin is 1 g / 10 min to 20 g / 10 min, the weight loss starting temperature of the benzotriazole UV absorber is 150 ° C. or higher, and the hindered amine The weight loss starting temperature of the light stabilizer is 150 ° C. or higher, and the ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer is 1: 1 to 1:10 by weight, and the surface protective film The thickness is 0.1 mm to 2.0 mm.

  The surface protective film needs to contain a polyolefin resin.

  The polyolefin resin needs to be a polypropylene resin. Among these, a polypropylene-ethylene-random copolymer, a polypropylene-ethylene-block copolymer, a homopolypropylene resin, etc. are more preferable. Particularly, the use of a polypropylene-ethylene-random copolymer improves wear resistance. Most preferable in that it can be made to occur.

  The polypropylene resin needs to have a melt flow rate of 1 g / 10 min to 20 g / 10 min. If it is less than 1 g / 10 minutes, the film formability deteriorates, and if it exceeds 20 g / 10 minutes, the film formability deteriorates, which is not preferable. In particular, the melt flow rate of the polypropylene resin is more preferably 5 g / 10 min to 10 g / 10 min. Within this range, the film can be uniformly formed even if the processing temperature during film formation is lowered to 210 ° C to 250 ° C. Furthermore, since the processing temperature at the time of film formation can be lowered, it is possible to reduce smoke generated at the time of film formation.

  The surface protective film needs to contain a benzotriazole ultraviolet absorber and a hindered amine light stabilizer.

  The weight loss starting temperature of the benzotriazole-based ultraviolet absorber needs to be 150 ° C. or higher. If it is less than 150 degreeC, since smoke generation property worsens, it is not preferable. The benzotriazole-based ultraviolet absorber having a weight loss starting temperature of 150 ° C. or higher is not particularly limited. For example, 2 [2-hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) ) -5-methylphenyl] benzotriazole, 2- (2-hydroxy-3,5-di-tert-acylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole and the like. Among them, it is more preferable to use 2 [2-hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole.

  The weight loss starting temperature of the hindered amine light stabilizer needs to be 150 ° C. or higher. If it is less than 150 degreeC, since smoke generation property worsens, it is not preferable. The hindered amine light stabilizer having a weight loss starting temperature of 150 ° C. or higher is not particularly limited, and examples thereof include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate. Can be mentioned.

  The ratio of the benzotriazole ultraviolet absorber and the hindered amine light stabilizer must be 1: 1 to 1:10 by weight. When it is outside this range, weather resistance cannot be obtained, which is not preferable. Especially, it is more preferable that the ratio of the said benzotriazole type ultraviolet absorber and the said hindered amine light stabilizer is 1: 3 to 1: 5 by weight ratio.

  It is preferable that the said benzotriazole type ultraviolet absorber is 0.05 mass part-2.0 mass parts with respect to 100 mass parts of said polypropylene resins. If it is less than 0.05 parts by mass, weather resistance cannot be obtained, and if it exceeds 2.0 parts by mass, the benzotriazole-based ultraviolet absorber emits smoke, which is not preferable. Among these, 0.1 to 0.5 parts by mass is more preferable.

  The hindered amine light stabilizer is preferably 0.1 parts by mass to 4.0 parts by mass with respect to 100 parts by mass of the polypropylene resin. If the amount is less than 0.1 parts by mass, weather resistance cannot be obtained, and if the amount exceeds 4.0 parts by mass, the hindered amine light stabilizer smokes, which is not preferable. Among these, 0.3 to 1.5 parts by mass is more preferable.

  The thickness of the surface protective film needs to be 0.1 mm to 2.0 mm. If it is less than 0.1 mm, the wear resistance cannot be obtained, and if it exceeds 2.0 mm, the weight becomes heavy. Of these, 0.3 mm to 0.5 mm is more preferable.

  The method for producing the surface protective film according to the present invention is not particularly limited, and for example, a known apparatus such as a calendering machine or an extrusion machine, a known laminating technique such as a hot laminating machine, or an inflation molding machine is used. can do.

  As temperature at the time of shape | molding the said surface protection film, it is necessary to be 210 to 250 degreeC. If it is less than 210 degreeC, the film-forming property of a film will not be obtained, but if it exceeds 250 degreeC, since smoke generation property will worsen, it is unpreferable. Among these, 220 ° C. to 230 ° C. is more preferable. By being in this range, it is possible to reduce smoke generated during film formation. Furthermore, even if the processing temperature is lowered to 210 ° C. to 250 ° C., since the melt flow rate of the polypropylene resin is 1 g / 10 min to 20 g / 10 min, a film can be uniformly formed.

  As the order for producing the surface protective film, the polypropylene resin, the benzotriazole-based ultraviolet absorber and the hindered amine-based light stabilizer may be mixed simultaneously or a film may be formed, or the polypropylene resin and The benzotriazole-based ultraviolet absorber and the hindered amine-based light stabilizer may be mixed with an extruder and masterbatched in advance.

  The surface protective film may appropriately contain various additives such as a lubricant, a flame retardant, a colorant, and an antistatic agent.

  Even when the surface protective film is used for flooring, it has excellent weather resistance and excellent wear resistance. Therefore, the surface protective film may be used alone, but it is preferable to use the surface protective film as the outermost surface layer. When used as the outermost surface layer, it is preferable to laminate a resin layer under the surface protective film. In this case, a flooring material excellent in wear resistance can be obtained.

  The resin in the resin layer is not particularly limited, and examples thereof include polyolefin resins, olefin elastomers, styrene elastomers, polypropylene-ethylene-random copolymers, etc., among which polyolefin resins, An olefin-based elastomer is preferable, and a polyolefin-based resin is most preferable.

  The number of the resin layers is not particularly limited, but may be one layer or two layers. In the case of two layers, it is preferable to insert a reinforcing layer. Although it does not specifically limit as said reinforcement layer, For example, a glass nonwoven fabric, a glass woven fabric, a glass net etc. are mentioned. The peel strength between the layers can be improved, and the dimensional stability of the flooring can be improved.

  The thickness of the resin layer is preferably 1.0 mm to 2.5 mm. If it is less than 1.0 mm, the wear resistance is deteriorated, and if it exceeds 2.5 mm, the weight becomes heavy.

  The resin layer may appropriately contain various additives such as inorganic fillers, antioxidants, ultraviolet absorbers, lubricants, heat stabilizers, flame retardants, weathering agents, colorants, and antistatic agents.

  The method for producing the resin layer is not particularly limited, but it is preferable that the resin layer is kneaded with a Banbury mixer, a kneader or the like and then produced with a calendering machine, an extruder or the like.

  When the surface protective film is used for flooring, a printing layer may be laminated on the lower surface of the surface protective film. In this case, it is preferable that a primer coating layer is formed on the lower surface of the printing layer. By forming such a primer coating layer, the adhesive strength between the printed layer and the resin layer can be improved. The primer coating layer is preferably a primer coating layer containing a modified polyolefin resin. The printing layer can be formed by, for example, an inkjet method, a gravure printing method, a screen printing method, a transfer printing method, or the like.

  Although it does not specifically limit as thickness of the said flooring, It is preferable to set to 1.0 mm-4.5 mm.

  The method for producing the flooring is not particularly limited. For example, the flooring material is laminated using a known apparatus such as a hot press machine, a calendering machine, an extruder, or a known laminating technique of a hot laminating machine. Can be manufactured. Further, the stacking order is not particularly limited.

  Next, specific examples of the present invention will be described, but the present invention is not particularly limited to these examples.

<Example 1>
As a polypropylene resin, 100 parts by mass of a polypropylene-ethylene-random copolymer (melt flow rate 15 g / 10 min), 0.2 parts by mass of a benzotriazole-based ultraviolet absorber (weight loss start temperature 155 ° C.), a hindered amine light stabilizer (The weight loss starting temperature is 159 ° C.) was molded at a processing temperature of 225 ° C. using an inflation molding machine at a ratio of 0.6 part by mass to obtain a surface protective film having a thickness of 0.4 mm. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 2>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a polypropylene-ethylene-block copolymer (melt flow rate 6 g / 10 min) was set as the polypropylene resin. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 3>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a homopolypropylene resin (melt flow rate 9 g / 10 min) was set as the polypropylene resin. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 4>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a polypropylene-ethylene-random copolymer (melt flow rate 3 g / 10 min) was set as the polypropylene resin. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 5>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a benzotriazole-based ultraviolet absorber (a weight reduction starting temperature was 200 ° C.) was set. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 6>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a benzotriazole-based ultraviolet absorber (a weight loss starting temperature was 267 ° C.) was set. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 7>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the hindered amine light stabilizer was set to a weight loss starting temperature of 175 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 8>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the hindered amine light stabilizer was set to a weight loss starting temperature of 190 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 9>
Example except that benzotriazole ultraviolet absorber (weight loss starting temperature is 155 ° C.) is set to 0.1 parts by mass and hindered amine light stabilizer (weight loss starting temperature is 159 ° C.) is set to 0.6 parts by weight. 1, a surface protective film having a thickness of 0.4 mm was obtained. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 6 by weight.

<Example 10>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the processing temperature was set to 210 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 11>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the processing temperature was set to 240 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Example 12>
A surface protective film having a thickness of 1.0 mm was obtained in the same manner as in Example 1 except that the thickness was set to 1.0 mm. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 1>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the setting was made so as not to contain a benzotriazole ultraviolet absorber and a hindered amine light stabilizer.

<Comparative example 2>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the hindered amine light stabilizer was not included.

<Comparative Example 3>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the setting was made so as not to contain a benzotriazole ultraviolet absorber.

<Comparative Example 4>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a polypropylene-ethylene-random copolymer (melt flow rate 0.1 g / 10 min) was set as the polypropylene resin. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 5>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that a polypropylene-ethylene-random copolymer (melt flow rate 30 g / 10 min) was set as the polypropylene resin. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 6>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that it was set to a benzotriazole-based ultraviolet absorber (weight loss starting temperature was 139 ° C.). The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 7>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the hindered amine light stabilizer was set to a weight loss starting temperature of 139 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 8>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the hindered amine light stabilizer (weight loss starting temperature was 159 ° C.) was set to 0.05 part by mass. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 0.25 by weight.

<Comparative Example 9>
Example except that benzotriazole ultraviolet absorber (weight loss starting temperature is 155 ° C.) is set to 0.01 parts by mass and hindered amine light stabilizer (weight loss starting temperature is 159 ° C.) is set to 0.15 parts by mass. 1, a surface protective film having a thickness of 0.4 mm was obtained. The ratio of the benzotriazole ultraviolet absorber and the hindered amine light stabilizer was 1:15 by weight.

<Comparative Example 10>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the processing temperature was set to 200 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 11>
A surface protective film having a thickness of 0.4 mm was obtained in the same manner as in Example 1 except that the processing temperature was set to 260 ° C. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

<Comparative Example 12>
A surface protective film having a thickness of 0.01 mm was obtained in the same manner as in Example 1 except that the thickness was set to 0.01 mm. The ratio of the benzotriazole ultraviolet absorber to the hindered amine light stabilizer was 1: 3 by weight.

  Each surface protective film obtained as described above was evaluated based on the following evaluation method. These evaluation results are shown in Table 1.

<Weather resistance evaluation method>
The surface protective films prepared in Examples 1 to 12 and Comparative Examples 1 to 12 were irradiated with a sunshine weather meter at a temperature of 63 ° C., humidity of 50%, rain for 18 minutes in 120 minutes, 500 hours, irradiation intensity of 78.5 W / m ^2. The deterioration was accelerated under the conditions of After punching out the surface protection film whose deterioration has been promoted into a dumbbell-shaped No. 5 system, a tensile tester (TGE-5kN) manufactured by Minebea Co., Ltd. is used and the tensile speed is 100 mm / min in accordance with JIS K7161-1-2014 The tensile strength was measured under the conditions. The tensile strength of the surface protective film that has not been accelerated by the sunshine weather meter was also measured under the same tensile conditions, and the strength reduction rate (%) was calculated based on the following calculation formula. 10% or more and less than 15% was “◯”, 15% or more and less than 17% was “Δ”, 17% or more was “x”, and “○” or more was acceptable.
Strength reduction rate (%) = (A / B) × 100
A = initial strength (MPa) −strength after irradiation for 500 hours (MPa)
B = Initial strength (MPa)

<Abrasion resistance evaluation method>
As a resin layer, a resin composition comprising 35 parts by mass of a polyolefin resin, 65 parts by mass of an olefin elastomer and 85 parts by mass of carbonate is kneaded with a Banbury mixer, and a resin sheet having a thickness of 1.5 mm is prepared using a calendar processing machine. Created. From the bottom, the 1.5 mm thick resin sheet and the surface protective film prepared in Example 1 were stacked in this order, and a 20 cm × 20 cm metal plate was placed on the surface protective film, and a hot press machine was installed. A flooring material having a thickness of 1.9 mm was obtained by performing compression molding for 10 minutes under the conditions of 160 ° C. and 1.0 MPa. In Examples 2-12 and Comparative Examples 1-12, flooring materials were obtained in the same procedure. Next, in accordance with JIS A 1454-2016, the surface protective film side is turned to the surface to rotate under the condition of the wear wheel S42 and the load of 500 g, and the rotation when the surface protective film is damaged and the resin layer is exposed. The number of times was measured. Evaluation was made based on the following criteria, and a score of “◯” or higher was accepted.
(Criteria)
“◯”: The number of rotations is 4000 times or more “Δ”: The number of rotations is 2000 times or more and less than 4000 “x”: The number of rotations is less than 2000

<Smokeability evaluation method>
The amount of smoke generated when forming the surface protective film was visually confirmed. “◎” indicates that no smoke is generated at all, “○” indicates that only a small amount of smoke is recognized and there is no substantial problem, “△” indicates that smoke is slightly generated, and smoke is noticeable. The result was “x”, and “◯” or higher was accepted.

<Filmability evaluation method>
When the surface protective film was formed, it was visually confirmed whether the surface protective film could be uniformly formed or whether the surface protective film could not be formed uniformly. “◯” indicates that the film was formed uniformly, “×” indicates that the film could not be formed uniformly, and “◯” or higher was determined to be acceptable.

  As is apparent from Table 1, the surface protective films of Examples 1 to 12 of the present invention have excellent weather resistance, excellent wear resistance, and little smoke generation during film forming, and film formation. It was excellent in nature.

  On the other hand, as is clear from Table 2, the surface protective film of Comparative Example 1 was inferior in weather resistance. The surface protective film of Comparative Example 2 was inferior in weather resistance. The surface protective film of Comparative Example 3 was inferior in weather resistance. The surface protective film of Comparative Example 4 was inferior in film formability. The surface protection film of Comparative Example 5 was inferior in film formability. The surface protective film of Comparative Example 6 was inferior in smoke generation. The surface protective film of Comparative Example 7 was inferior in smoke generation. The surface protective film of Comparative Example 8 was inferior in weather resistance. The surface protective film of Comparative Example 9 was inferior in weather resistance. The surface protective film of Comparative Example 10 was inferior in film formability. The surface protective film of Comparative Example 11 was inferior in smoke generation. The surface protective film of Comparative Example 12 was inferior in wear resistance.

  The surface protective film according to the present invention is, for example, a flooring of buildings such as buildings, condominiums, houses, commercial facilities, railroads, buses, ships, nursing homes, underground facilities, hospitals, bathrooms, toilets, washrooms, etc. Suitable as a material or the like.

Claims (4)

   A surface protective film containing a polyolefin resin, comprising a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, wherein the polyolefin resin is a polypropylene resin, and the melt flow rate of the polypropylene resin Is 1 g / 10 min to 20 g / 10 min, the weight loss starting temperature of the benzotriazole-based UV absorber is 150 ° C. or higher, the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. or higher, The ratio of the triazole ultraviolet absorber and the hindered amine light stabilizer is 1: 1 to 1:10 by weight, and the thickness of the surface protective film is 0.1 mm to 2.0 mm. Surface protective film.   The benzotriazole ultraviolet absorber is 0.05 to 2.0 parts by mass with respect to 100 parts by mass of the polypropylene resin, and the hindered amine light stabilizer is 0.1 with respect to 100 parts by mass of the polypropylene resin. It is a mass part-4.0 mass parts, The surface protection film of Claim 1.   The flooring which laminated | stacked the surface protection film of Claim 1 or 2 on the outermost surface.   A method for producing a surface protective film containing a polyolefin resin, comprising a benzotriazole ultraviolet absorber and a hindered amine light stabilizer, wherein the polyolefin resin is a polypropylene resin, The melt flow rate is 1 g / 10 min to 20 g / 10 min, the weight loss starting temperature of the benzotriazole UV absorber is 150 ° C. or higher, and the weight loss starting temperature of the hindered amine light stabilizer is 150 ° C. or higher. The ratio of the benzotriazole-based UV absorber and the hindered amine-based light stabilizer is 1: 1 to 1:10 by weight, the thickness of the surface protective film is 0.1 mm to 2.0 mm, and 210 ° C. The manufacturing method of the surface protection film characterized by shape | molding at the temperature of -250 degreeC.