JP7170560B2 - Sheet for blasting method - Google Patents

Description

The present invention relates to a sheet for blasting method.

BACKGROUND ART When repainting a coating film on a structure such as a bridge, the old coating film is once removed by blasting, and then a new coating is applied. The blasting process generates dust from the coating film. Since the paint film may contain toxic substances such as polychlorinated biphenyls and lead, it is necessary to seal the work environment and prevent dust from scattering when performing blasting.

In order to prevent the scattering of dust during blasting, it is common to partition the working environment from the outside with a panel and cover the inside of the panel with a sheet for blasting. As the sheet for the blasting method, a general sheet for construction work is used. This sheet for construction work is obtained by coating the surface of a woven fabric made of flat yarn with a resin, and polyethylene or polyvinyl chloride is used as the resin (for example, Patent Document 1).

JP-A-3-36367

However, when the sheet for construction work is used as the sheet for the blasting method, holes may be formed by scattered objects such as cutting materials rebounded from the surface to be treated during the blasting process. In particular, when blasting is performed in a low-temperature environment such as in winter, holes are likely to form. If the blasting sheet is perforated, there is concern that dust containing harmful substances may leak outside.

In addition, blasting sheets using polyvinyl chloride may undergo brittle fracture in low-temperature environments such as outdoors in winter, making them more likely to break. In addition, polyethylene is known as a general-purpose plastic that is resistant to low temperatures, but the energy applied to the sheet for blasting by flying debris during blasting is strong, and there is a risk of tearing (chipping) due to flying debris even at room temperature. there were.

The present invention has been made in view of the above-mentioned circumstances, and is for a blasting method that makes it difficult for holes to form due to the collision of scattered objects during blasting in a low-temperature environment, and can prevent brittle fracture at low temperatures. The purpose is to provide a sheet.

The present invention has the following aspects.
<1> A sheet for a blasting method containing a soft vinyl chloride resin composition obtained by adding a plasticizer to a vinyl chloride resin, having a thickness of 110 μm or more, and having an impact resistance energy of 2 at 25° C. in a film impact tester test. .0 J or more, and the difference between 25 ° C. and -10 ° C. is less than 0.1 J , the plasticizer contains an aliphatic dibasic acid ester, and the vinyl chloride resin is 100 parts by weight. A sheet for blasting , wherein the plasticizer is 30 to 55 parts by weight, and the aliphatic dibasic acid ester accounts for 50% by mass or more of the plasticizer .
However, in the film impact tester test, a strip-shaped sheet with a width of 10 cm is prepared as a test piece, and a film impact tester with a constant temperature chamber (manufactured by Toyo Seiki Co., Ltd.) is used to place the sample piece in a constant temperature chamber. After the temperature was kept constant, the sample piece was fixed on a fixing plate having an outer shape of 15 cm x 10 cm and a hole of 5 cm in diameter in the center, and an impact energy of 3 J was applied with a pendulum-type hammer having a hemispherical impactor with a diameter of 1 cm at the tip. The sample piece was hit at , and the impact resistance energy was measured. Measurements were performed at temperatures of the constant temperature layer of −25° C., −20° C., −15° C., −10° C., 0° C. and 25° C., respectively.

<2> The sheet for blasting method according to <1>, wherein the impact resistance energy in the film impact tester test is 2.0 J or more at -10°C.

<3> The sheet for blasting method according to <1> or <2>, wherein the impact resistance energy in the film impact tester test is 2.0 J or more at -20°C.

< 4 > Any one of <1> to <3>, wherein the aliphatic dibasic acid ester contains at least one of dioctyl adipate and bis[2-(2-butoxyethoxy)ethyl]adipate The sheet for the blasting method described in .

< 5 > The sheet for blasting method according to any one of <1> to < 4 >, which has flame resistance.

ADVANTAGE OF THE INVENTION According to this invention, the sheet|seat for blasting methods which can prevent the brittle fracture|rupture at the time of a low temperature at the time of the blasting process in a low-temperature environment with which a hole is hard to open by the collision of a flying object can be provided.

It is a schematic diagram which shows the outline|summary of a chipping resistance test.

The following term definitions apply throughout the specification and claims.
"Machine Direction" is the direction in which the sheet is formed, i.e., the longitudinal direction.
"Young's modulus" is a tensile modulus measured by the method specified in JIS K 7161-1:2014.
"Elongation at break" is the tensile breaking strain measured by the method specified in JIS K 7161-1:2014.
The "embrittlement temperature" is the minimum temperature value at which cracking due to embrittlement does not occur, measured using a film impact tester (pendulum type impact tester) with a constant temperature bath manufactured by Toyo Seiki Seisakusho.
Detailed measurement methods are as described in Examples.
The term "having flame resistance" means exhibiting flame resistance of grade 2 or higher in a flame resistance test according to Method B of JIS Z 2150:1996.
"~" indicating a numerical range means that the numerical values before and after it are included as lower and upper limits.

<Sheet for blasting method>
The blasting sheet of this embodiment is made of a soft vinyl chloride resin composition.
A soft vinyl chloride resin composition contains a vinyl chloride resin and a plasticizer.
The soft vinyl chloride resin composition may optionally further contain components other than the vinyl chloride resin and the plasticizer (hereinafter also referred to as "other components") within a range that does not impair the effects of the present embodiment. good.

(vinyl chloride resin)
Examples of vinyl chloride resins include polyvinyl chloride and copolymers mainly composed of vinyl chloride. Examples of copolymers mainly composed of vinyl chloride include ethylene-vinyl chloride copolymers, vinyl acetate-vinyl chloride copolymers, vinyl chloride-halogenated olefin copolymers, and the like.

In addition, other compatible resins mainly composed of these vinyl chloride resins (for example, polyester resins, epoxy resins, acrylic resins, vinyl acetate resins, urethane resins, acrylonitrile-styrene-butadiene copolymers, partially saponified polyvinyl alcohol, etc.) ) are also included.

The proportion of vinyl chloride units in the vinyl chloride resin is preferably 80% by mass or more with respect to the total resin components. The polymerization method of the vinyl chloride resin is not particularly limited, and conventional polymerization methods such as bulk polymerization method, emulsion polymerization method, suspension polymerization method and solution polymerization method can be mentioned. Any one of these vinyl chloride resins may be used alone, or two or more thereof may be used in combination.

The vinyl chloride resin preferably has an average degree of polymerization of 800 to 2,500, more preferably 1,000 to 2,000. When the average degree of polymerization is at least the lower limit of the above range, the film does not stretch excessively when pulled, and does not impair handleability. When the average degree of polymerization is equal to or less than the upper limit of the above range, it is not too hard, and holes are less likely to form during blasting.

(Plasticizer)
Examples of plasticizers include aromatic dibasic acid ester plasticizers such as dioctyl phthalate, di-2-ethylhexyl phthalate, dibenzyl phthalate, diisononyl phthalate, diisodecyl phthalate, and diisooctyl isophthalate; Diisobutyl adipate, dioctyl adipate, bis (2-ethylhexyl) adipate, diisononyl adipate, diisodecyl adipate, bis [2-(2-butoxyethoxy) ethyl] adipate, bis (2-ethylhexyl) azelate, dibutyl sebacate, bis (2- ethylhexyl) sebacate, diethyl succinate, di-n-butyl malate, monobutyl itaconate and other aliphatic dibasic acid ester plasticizers; tri-n-butyl citrate and other aliphatic tribasic acid ester plasticizers; butyl Aliphatic monobasic acid ester plasticizers such as oleate; polyhydric alcohol derivative plasticizers such as glycerol monoricinoleate; phosphate ester plasticizers such as tricresyl phosphate and trixylenyl phosphate; Epoxy-based plasticizers and the like are included. Any one of these plasticizers may be used alone, or two or more thereof may be used in combination.

The plasticizer contains at least one plasticizer selected from the group consisting of an aromatic dibasic ester plasticizer and an aliphatic dibasic ester plasticizer, from the viewpoint of compatibility with vinyl chloride resin. is preferred. In this embodiment, bis(2-ethylhexyl) phthalate (hereinafter referred to as DOP) can be exemplified as the aromatic dibasic acid ester of the plasticizer. In addition, from the viewpoint of brittleness resistance in a low-temperature environment, bis(2-ethylhexyl) adipate (dioctyl adipate: hereinafter referred to as DOA), bis[2-(2-butoxyethoxy)ethyl ] Adipate (hereinafter referred to as BXA-N) and bis(2-ethylhexyl) sebacate (hereinafter referred to as DOS) can be exemplified.

The content of the plasticizer is preferably 30 to 55 parts by mass, more preferably 30 to 50 parts by mass with respect to 100 parts by mass of the vinyl chloride resin, in order to cope with blasting in a low temperature environment. If the content of the plasticizer is at least the lower limit of the above range, the flexibility of the soft vinyl chloride is excellent and the cold resistance is improved. In addition, film formability (production stability) is improved. If the content of the plasticizer is equal to or less than the upper limit of the above range, the handling property of the sheet for the present blasting method will be more excellent.

In this embodiment, it is preferable to use an aliphatic dibasic acid ester among dibasic acid esters. DOA and BXA-N are preferably used as aliphatic dibasic acid esters. When DOA or BXA-N is used as the aliphatic dibasic acid ester, at least one of DOA and BXA-N preferably accounts for 50% by mass or more of the total amount of the plasticizer. As a result, excellent chipping resistance can be exhibited even in a low temperature environment of -10°C.

(Flame retardants)
From the viewpoint of flame resistance of the sheet for blasting method of the present embodiment, it is preferable that a flame retardant is included.
Examples of flame retardants include phosphate ester flame retardants, phosphorus-nitrogen composite flame retardants, and halogen flame retardants. When the phosphate ester-based flame retardant is included as the flame retardant, the soft vinyl chloride resin composition preferably further includes a metal hydroxide, which will be described later.
When the flame retardant contains a phosphate ester flame retardant, the content of the phosphate ester flame retardant is preferably 5 to 30 parts by mass, more preferably 10 to 25 parts by mass, relative to 100 parts by mass of the vinyl chloride resin.

When the flame retardant contains a phosphate ester flame retardant and further contains a metal hydroxide, the content of the phosphate ester flame retardant is preferably 1 to 30 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. ~15 parts by mass is more preferred.
Phosphate flame retardants include trimethyl phosphate (TMP), triethyl phosphate (TEP), tributyl phosphate (TBP), tris(2-ethylhexyl) phosphate (TOP), triphenyl phosphate (TPP), tri-cresyl phosphate (TCP), trixylenyl phosphate (TXP), cresyl diphenyl phosphate (CDP), 2-ethylhexyl diphenyl phosphate.
(other ingredients)
Other components include stabilizers, metal hydroxides, ores, lubricants, flame retardant auxiliaries, antiblocking agents, rubbers, elastomers, etc., and may be contained within a range that does not impair the object and characteristics of the present invention. good.

Examples of stabilizers include epoxy-based stabilizers such as bisphenol A glycidyl ether, barium-zinc-based composite stabilizers, calcium-zinc-based composite stabilizers, and the like. Any one of these stabilizers may be used alone, or two or more thereof may be used in combination.
The stabilizer preferably contains an epoxy-based stabilizer and a barium-zinc-based composite stabilizer from the viewpoints of compatibility with vinyl chloride resin, molding processability, and low toxicity. The barium-zinc composite stabilizer may be liquid or powder.

The stabilizer content is preferably 1 to 10 parts by mass, more preferably 3 to 8 parts by mass, per 100 parts by mass of the vinyl chloride resin.

Metal hydroxides are used to improve flame resistance. Examples of metal hydroxides include magnesium hydroxide, aluminum hydroxide, manganese hydroxide, calcium hydroxide, ammonium hydroxide, zinc hydroxide, trunk (II) hydroxide, lanthanum hydroxide, and iron (II) hydroxide. mentioned. Any one of these metal hydroxides may be used alone, or two or more thereof may be used in combination.

When the soft vinyl chloride resin composition contains a metal hydroxide, the content of the metal hydroxide is preferably 3 to 30 parts by mass, more preferably 5 to 20 parts by mass, based on 100 parts by mass of the vinyl chloride resin. By setting the compounding ratio within this range, the flameproof effect can be enhanced without impairing the handleability and workability.
Ore is used to improve flame resistance. The ores include hydrotalcite, talc, montmorillonite, mica, and other ores containing hydroxyl groups. Any one of these ores may be used alone, or two or more may be used in combination.
Further, when the soft vinyl chloride resin composition contains an ore, the content of the ore is preferably 3 to 20 parts by mass, more preferably 5 to 15 parts by mass with respect to 100 parts by mass of the vinyl chloride resin. By setting the compounding ratio within this range, the flameproof effect can be enhanced without impairing the handleability and workability.

Examples of lubricants include fatty acid amides such as ethylenebisstearic acid amide, stearic acid amide, palmitic acid amide and oleic acid amide, polyethylene wax, stearic acid and the like. Any one of these lubricants may be used alone, or two or more thereof may be used in combination.

When the soft vinyl chloride resin composition contains a lubricant, the content of the lubricant is, for example, 0.1 to 1.0 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

Examples of flame retardant aids include antimony compounds such as antimony trioxide; metal compounds such as ZnS and zinc borate; and organometallic complexes. By including such a flame retardant aid, flame resistance can be imparted to the blasting sheet.

Antiblocking agents include crosslinked vinyl chloride resin particles, polyolefin resin powders, fatty acid esters, and the like. Any one of these antiblocking agents may be used alone, or two or more thereof may be used in combination.

When the soft vinyl chloride resin composition contains an antiblocking agent, the content of the antiblocking agent is, for example, 1 to 10 parts by mass with respect to 100 parts by mass of the vinyl chloride resin.

(Sheet for blasting method)
A preferred aspect of the soft vinyl chloride resin composition of the present embodiment is a soft vinyl chloride resin composition containing a vinyl chloride resin, a plasticizer containing an aliphatic dibasic acid ester, particularly DOA and BXA-N, and a flame retardant. It is a thing.
The blasting method sheet of the present embodiment made of such a vinyl chloride resin composition has an impact resistance energy of 2.0 J or more at 25 ° C. in a film impact tester test, and a difference between 25 ° C. and -10 ° C. less than 0.1 J.

When the impact resistance energy in the film impact tester test is 2.0 J or more at 25° C., the blasting sheet is less likely to have holes during blasting. When the difference in impact resistance energy between 25° C. and −10° C. in a film impact tester test is less than 0.1 J, the blasting sheet is less likely to have holes even in blasting in a low-temperature environment.

The blasting method sheet of the present embodiment preferably has an impact resistance energy of 2.0 J or more at −10° C. in the film impact tester test described above. Also, the impact resistance energy is preferably 2.0 J or more at -20°C.
If the impact resistance energy measured by the film impact tester test is 2.0 J or more at -10°C or 2.0 J or more at -20°C, the blasting sheet is unlikely to form holes even in blasting in a low temperature environment.

The blasting sheet of the present embodiment has a Young's modulus in the machine direction of 5 to 200 MPa, preferably 5 to 100 MPa, more preferably 5 to 50 MPa, and even more preferably 10 to 30 MPa.
If the Young's modulus is at least the lower limit of the above range, the productivity and workability of the blasting sheet will be good. If the Young's modulus is equal to or less than the upper limit of the above range, holes are less likely to form during blasting.
Such Young's modulus can be adjusted by the content of the plasticizer in the soft vinyl chloride resin composition, the degree of polymerization of the vinyl chloride resin, and the like. For example, the Young's modulus tends to decrease as the plasticizer content increases.

The elongation at break in the machine direction of the blasting sheet of the present embodiment is 100 to 500%, preferably 150 to 450%, more preferably 200 to 400%. If the elongation at break is at least the lower limit of the above range, holes are less likely to form during blasting. If the elongation at break is equal to or less than the upper limit of the above range, the productivity and workability of the sheet are good.
The elongation at break can be adjusted by the content of the plasticizer in the soft vinyl chloride resin composition, the degree of polymerization of the vinyl chloride resin, and the like. For example, the higher the plasticizer content, the higher the elongation at break.

The blasting method sheet of the present embodiment preferably has a thickness of 110 to 300 μm, more preferably 150 to 250 μm. If the thickness is at least the lower limit of the above range, holes are less likely to form during blasting. When the thickness is equal to or less than the upper limit of the above range, the handleability and workability are good.

The blasting sheet of the present embodiment preferably has flame resistance.
Examples of methods for enhancing the flameproofness of the blasting sheet include a method of incorporating the above-mentioned flame retardant, a method of incorporating a metal hydroxide into the soft vinyl chloride resin composition, a method of incorporating an ore such as antimony trioxide, and the like. is mentioned. Moreover, the above methods may be used in combination.

The blasting method sheet of the present embodiment preferably has an embrittlement temperature of 0° C. or lower, more preferably −15° C. or lower, and even more preferably −25° C. or lower. If the embrittlement temperature is equal to or lower than the above upper limit, the blasting sheet has excellent cold resistance, and the blasting sheet is less likely to have holes even in blasting in a low-temperature environment.

The lower the embrittlement temperature of the sheet for blasting, the better, and the lower limit of the embrittlement temperature is not particularly limited, but is -40°C, for example.
A method of lowering the embrittlement temperature can be achieved by adding an aliphatic dibasic ester plasticizer to the soft vinyl chloride resin composition. Examples include a method using a plasticizer containing DOA, a method using a plasticizer containing BXA-N, and a method using a plasticizer containing both DOA and BXA-N.

The sheet for blasting method of the present embodiment may have a functional layer for imparting various functions as necessary within a range not impairing each effect described above. Functional layers include a decorative layer, an antiblocking layer, a weather resistant layer, and the like.

The blasting sheet of the present embodiment can be produced, for example, by molding a soft vinyl chloride resin composition into a sheet. A soft vinyl chloride resin composition can be prepared, for example, by mixing a vinyl chloride resin, a plasticizer containing at least an aliphatic dibasic acid ester, and optionally other components. Examples of the method for forming the blasting sheet from the soft vinyl chloride resin composition include extrusion molding, calendar molding, and inflation molding. The blasting sheet may be unstretched or stretched.

(Application)
The blasting sheet of this embodiment is for blasting.
In blasting, cutting material is sprayed onto the surface of the structure to be treated. As a result, the coating film or the like on the surface to be treated is removed as dust. The blasting sheet of this embodiment is used to prevent dust generated during blasting from scattering outside from the working environment.

The specific usage of the blasting sheet of the present embodiment may be the same as the usage of the blasting sheet conventionally used for blasting. For example, inside the panel surrounding the surface to be treated of the structure and the scaffolding for blasting, this embodiment prevents dust from scattering outside from the gap between the panels and the gap between the panel and the scaffolding. of blasting sheets can be placed.

The distance between the surface to be treated of the structure and the blasting sheet of the present embodiment is, for example, about 10 to 200 cm.
Structures include, for example, bridges, metal structures such as playground equipment such as slides, and metal machines and devices such as press machines and gas cylinders.
Examples of cutting materials include plastic-based, sand-based, and steel-based materials.

(Mechanism of action)
In the blasting method sheet of the present embodiment described above, the impact resistance energy in the film impact tester test is 2.0 J or more at 25 ° C., and the difference between 25 ° C. and -10 ° C. is less than 0.1 J. Therefore, even in a low-temperature environment of, for example, -10°C, holes are less likely to form when the cutting material sprayed onto the treated surface of the structure by blasting rebounds from the treated surface and hits the curing sheet.

The reason why it is difficult to form holes is that the blasting sheet is soft even at low temperatures, so it is easily deformed when it hits the cutting material, and the impact is alleviated. Construction sheets, which have been used as blasting sheets in the past, become hard at low temperatures, and are therefore likely to be perforated.

In particular, when an aliphatic dibasic acid ester is used as a plasticizer, the glass transition point (Tg) of the soft vinyl chloride resin composition is lowered by the dibasic acid ester that does not contain an aromatic ring, and even in a low temperature environment such as -10 ° C. The flexibility of the sheet for blasting method is maintained. As a result, it is possible to realize a sheet for blasting that does not break even in a blast irradiation test at -10°C and has excellent low-temperature properties.

Although several embodiments of the invention have been described above, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

EXAMPLES The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples.
Vinyl chloride resin: Polyvinyl chloride (PVC) with an average degree of polymerization of 1400.
Plasticizer 1: Aromatic dibasic acid ester: dioctyl phthalate (DOP).
Plasticizer 2: Aliphatic dibasic acid ester: dioctyl adipate (DOA).
Plasticizer 3: Aliphatic dibasic acid ester: bis[2-(2-butoxyethoxy)ethyl]adipate (BXA-N).
Plasticizer 4: Aliphatic dibasic acid ester: bis(2-ethylhexyl) sebacate (DOS).
Flame retardant: Phosphate flame retardant: tricresyl phosphate (TCP).

Each of the above materials was mixed according to the formulations (mass parts) shown in Table 1 (Examples) and Table 2 (Comparative Examples, Reference Examples), kneaded at 185 ° C. for 5 minutes with a test roll machine (two-roll mill), By peeling off from the roll, sheets of Examples 1 to 7 and Comparative Examples 1 to 4 (sheets for blasting method) were obtained. The thickness was adjusted by changing the gap between the two rolls. As a reference example, a vinyl chloride coated sheet containing flat yarns and a polyethylene sheet, which are diverted to sheets for the blasting method, were also used.

Film impact tester (FIT) test Test equipment: Film impact tester (Film impact tester with constant temperature bath manufactured by Toyo Seiki Co., Ltd.)
The sheet of each sample described above was cut into strips with a width of 10 cm to prepare measurement samples. Then, the sample was placed in a constant temperature layer and kept at a constant temperature, fixed to a fixing plate having an outer shape of 15 cm x 10 cm and a hole of 5 cm in diameter in the center, and a pendulum type hammer having a hemispherical impactor with a diameter of 1 cm at the tip. Each sample for measurement was hit with an impact energy of 3 J to measure the impact resistance energy of the sample. The temperature of the constant temperature layer was set to −25° C., −20° C., −15° C., −10° C., 0° C., and 25° C., and the measurements were performed.
The results of the FIT test are shown in Table 1 (Examples) and Table 2 (Comparative Examples, Reference Examples).

Next, a chipping resistance test was performed on each material described above.
Test equipment: Mighty Mini R (manufactured by SNM Asia Co., Ltd.)
Test temperature: -10°C
Test pressure: 0.3MPA
Test time: 10 seconds Test distance (distance between injection nozzle tip and sample surface): 35 cm
Cutting material: Steel grid Specimen table: Iron plate

As shown in FIG. 1, in the chipping resistance test, an iron plate 22 as a sample table is provided in a chamber 21, and each sample S is placed on the iron plate 22. As shown in FIG. Then, the cutting material C is injected into the chamber 21 from the cutting material supply part 23 . Then, it is visually confirmed whether or not the jetted cutting material C causes damage such as a hole in each sample S.
The results of the chipping resistance test are shown in Table 1 (Examples) and Table 2 (Comparative Examples, Reference Examples). A sample in which no hole was formed by cutting material C was rated as ◯, and a sample with a hole in it was rated as x.

According to the results of the present invention, if the impact resistance energy in the film impact tester test is 2.0 J or more at 25 ° C. and the difference between 25 ° C. and -10 ° C. is less than 0.1 J, it is -10 ° C. It was confirmed that excellent chipping resistance can be secured even in a low temperature environment. Therefore, in the present invention, it is possible to realize a sheet for blasting that does not cause holes due to scattered matter even when used in a low temperature environment of -10°C.

When DOA is used as a plasticizer, chipping resistance at -10°C can be achieved by setting the amount of DOA to be 50% by mass or more of the total amount of plasticizers including other plasticizers. However, when DOS is used as a plasticizer, chipping resistance at -10°C can be achieved even if the amount added is less than 1 times the total amount of the other plasticizers.

Also, in the FIT test at -10°C, if the impact resistance is 2.0 J or more, the sheet does not break even in the chipping resistance at -10°C.
Further, by setting the thickness of the sheet in the range of 110 μm to 300 μm, chipping resistance at −10° C. can be achieved while ensuring workability.

Claims (5)

A sheet for a blasting method containing a soft vinyl chloride resin composition obtained by adding a plasticizer to a vinyl chloride resin, having a thickness of 110 μm or more, and having an impact resistance energy of 2.0 J or more at 25° C. in a film impact tester test. , and the difference between 25 ° C. and -10 ° C. is less than 0.1 J ,
The plasticizer contains an aliphatic dibasic acid ester,
A blasting method characterized in that the plasticizer is 30 to 55 parts by weight with respect to 100 parts by weight of the vinyl chloride resin, and the aliphatic dibasic acid ester accounts for 50% by mass or more of the plasticizer. sheet for. The sheet for blasting according to claim 1, wherein the impact resistance energy measured by the film impact tester test is 2.0 J or more at -10°C. The sheet for blasting according to claim 1 or 2, wherein the impact resistance energy measured by the film impact tester test is 2.0 J or more at -20°C. The blasting method according to any one of claims 1 to 3, wherein the aliphatic dibasic acid ester includes at least one of dioctyl adipate or bis [2-(2-butoxyethoxy) ethyl] adipate. sheet for. The sheet for blasting according to any one of claims 1 to 4 , which has flame resistance.

Images