Vinyl chloride resin composition, vinyl chloride resin molded article using the same

Abstract

The present invention provides a polyvinyl chloride resin composition that exhibits minimal decrease in flame retardancy even when repeatedly used as a recycled material. [Solution] When a primary to quaternary vinyl chloride resin test specimen is prepared by a predetermined procedure using the vinyl chloride resin composition of the present invention, the average specific light reduction area of ​​each primary to quaternary vinyl chloride resin test specimen is 90 [m²]. 2 The value is less than or equal to [ / kg], and the average value of the average specific light reduction area of ​​each of the primary to quaternary polyvinyl chloride resin test specimens is 80 [m²]. 2 It is characterized by being less than or equal to [ / kg].

Description

[Technical Field]

[0001] This invention relates to a vinyl chloride resin composition that does not easily lose flame retardancy even after recycling, and a vinyl chloride resin molded article using the same. [Background technology]

[0002] Polyvinyl chloride resin has excellent flame retardancy and is used as interior and exterior material for transport aircraft, interior and exterior material for buildings, housing material for home appliances, etc. In addition, it can be molded into plates and used as cover material to surround semiconductor manufacturing equipment such as liquid crystal displays, which can prevent the spread of fire in the event of a fire.

[0003] As a vinyl chloride resin composition for molding vinyl chloride resin, for example, a flame-retardant vinyl chloride resin composition has been developed characterized in that the amount of chlorine in the vinyl chloride resin is A by weight, the amount of compounding agent to be blended into the resin is B by weight, and the amount of components in the compounding agent with a melting point of 30°C or lower is C by weight, and A:B:C is in the range of 1.0:0.09:0.040 to 1.0:0.15:0.080 (see Patent Document 1 below). [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2005-298766 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Generally, vinyl chloride resins with a chlorination rate (also called degree of chlorination) of 65% or less are used in vinyl chloride resin compositions. For example, Patent Document 1 above shows a vinyl chloride resin composition using a vinyl chloride resin with a degree of chlorination of 65% or 58% (see Table 1 or Table 2 of Patent Document 1 above).

[0006] On the other hand, in recent years, materials have been recycled in order to make effective use of resources. However, recycled polyvinyl chloride resin molded products, which were produced by using used polyvinyl chloride resin molded products as recycled materials and adding these recycled materials to the polyvinyl chloride resin composition, were more flammable than those without recycled materials, resulting in a problem where the necessary flame retardancy could not be ensured.

[0007] As a result of diligent research, the inventors discovered that the decrease in flame retardancy can be suppressed by increasing the chlorination rate of polyvinyl chloride resin, and have developed a new polyvinyl chloride resin composition that does not easily lose flame retardancy even when used as a recycled material.

[0008] Therefore, the object of the present invention is to provide a vinyl chloride resin composition that does not easily lose flame retardancy even when repeatedly used as a recycled material. [Means for solving the problem]

[0009] The present invention has the following embodiments as described in [1] to [6].

[0010] [1] A vinyl chloride resin composition in which, when primary to quaternary vinyl chloride resin test specimens are prepared by the following procedure (1) to (4), the average specific light reduction area of ​​the primary to quaternary vinyl chloride resin test specimens is 90 [m² 2 The value is less than or equal to [ / kg], and the average value of the average specific light reduction area of ​​each of the primary to quaternary polyvinyl chloride resin test specimens is 80 [m²]. 2 A vinyl chloride resin composition with a weight of [ / kg] or less. (1) A vinyl chloride resin test specimen is molded using the vinyl chloride resin composition, a primary vinyl chloride resin sheet is prepared from the vinyl chloride resin test specimen, and a primary vinyl chloride resin test specimen made from the primary vinyl chloride resin sheet is molded. (2) A secondary vinyl chloride resin sheet is prepared by mixing 70% by mass of the vinyl chloride resin test specimen and 30% by mass of the primary vinyl chloride resin sheet and molding it, and a secondary vinyl chloride resin test specimen made of the secondary vinyl chloride resin sheet is molded. (3) A vinyl chloride resin test body of 70% by mass and the secondary vinyl chloride resin sheet of 30% by mass were kneaded and molded to produce a tertiary vinyl chloride resin sheet, and a tertiary vinyl chloride resin test body made of the tertiary vinyl chloride resin sheet was molded. (4) A vinyl chloride resin test body of 70% by mass and the tertiary vinyl chloride resin sheet of 30% by mass were kneaded and molded to produce a quaternary vinyl chloride resin sheet, and a quaternary vinyl chloride resin test body made of the quaternary vinyl chloride resin sheet was molded.

[0011] [2]. The vinyl chloride resin composition according to [1], wherein the average value of the smoke density of each of the vinyl chloride resin test bodies is 0.3 [1 / m] or less.

[0012] [3]. The vinyl chloride resin composition according to [1] or [2], which uses a vinyl chloride resin having a chlorination rate of 67% or more as a raw material.

[0013] [4]. The vinyl chloride resin composition according to any one of [1] to [3], further containing zeolite.

[0014] [5]. A vinyl chloride resin molded body molded using the vinyl chloride resin composition according to any one of [1] to [4].

[0015] [6]. A vinyl chloride resin plate, wherein the vinyl chloride molded body according to [5] is in a plate shape.

Advantages of the Invention

[0016] The vinyl chloride resin composition of the present invention can be repeatedly used as a recycled material and is difficult to reduce its flame retardancy.

Brief Description of the Drawings

[0017] [Figure 1] It is a graph showing the average specific extinction area with respect to the number of recycling of vinyl chloride resin test bodies from primary to quaternary in Examples 1 and 2 and Comparative Example 1 (vertical axis: average specific extinction area [m2 / kg], horizontal axis: number of recycling [times]). [Modes for carrying out the invention]

[0018] The present invention will be described below based on one embodiment. However, the present invention is not limited to this embodiment.

[0019] <Vinyl chloride resin composition> The vinyl chloride resin composition of one embodiment of the present invention (hereinafter also referred to as "this vinyl chloride resin composition") contains vinyl chloride resin and can be prepared by adding other additives such as zeolite, impact modifier, tin-based stabilizer, and lubricant.

[0020] <Vinyl chloride resin> The vinyl chloride resin used in this vinyl chloride resin composition can be a vinyl chloride resin with a high chlorination rate. This makes it possible to reduce the average specific light reduction area and smoke concentration. A vinyl chloride resin with a high chlorination rate refers to a so-called post-chlorinated vinyl chloride resin, and a chlorination rate of 67% or more is preferred, a chlorination rate of 67-69% is more preferred, and a chlorination rate of 67-68% is particularly preferred. The vinyl chloride resin used in this vinyl chloride resin composition preferably consists only of a high-chlorination-rate vinyl chloride resin, but it may also contain a high-chlorination-rate vinyl chloride resin with a minimum of 80% by mass, 90% by mass, 95% by mass, 99% by mass, or 99.9% by mass. If a vinyl chloride resin other than a high-chlorination-rate vinyl chloride resin is included, it may include homopolymers such as polyvinyl chloride, or copolymers such as vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene copolymer, or vinyl chloride-acrylic copolymer. The vinyl chloride resin used in this vinyl chloride resin composition is preferably a soft or hard type with a degree of polymerization of approximately 400 to 1800.

[0021] <Zeolite> This polyvinyl chloride resin composition may contain zeolite. By including zeolite, the average specific light reduction area and smoke concentration can be further reduced. The zeolite is a microporous crystalline aluminosilicate, and may be natural or artificial. While there are no particular limitations on the zeolite used in this vinyl chloride resin composition, it is preferably an apparent specific gravity of 0.2 to 0.5 g / mL and an average particle size of 0.5 to 6.0 μm. More preferably, it is an apparent specific gravity of 0.2 to 0.4 g / mL and an average particle size of 0.5 to 5.0 μm. Apparent specific gravity can be measured according to JIS K6721, etc. The average particle size can be determined by measuring the particle size distribution using methods such as laser diffraction, and expressed as D50, for example.

[0022] <Impact enhancer> This vinyl chloride resin composition may contain an impact modifier, and the impact modifier can be, for example, a silicone-acrylic, acrylate, or methyl methacrylate-butadiene-styrene type.

[0023] <Tin-based stabilizer> This vinyl chloride resin composition may contain a tin-based stabilizer, and tin-based stabilizers such as mercapto-based, maleate-based, and laurate-based stabilizers can be used. More specifically, for example, dialkyltin dimercapto such as dibutyltin dimercapto and dioctyltin dimercapto, dialkyltin bis(isooctyl mercaptoacetate), dialkyltin bis(2-ethylhexyl mercaptoacetate), dialkyltin bis(isooctyl mercaptopropionate), and dialkyltin bis(isooctyl mercaptopropionate) and their hydrochloric acid treated products, dialkyltin dimalates such as dibutyltin dimalate and dioctyltin dimalate, dialkyltin bis(monoalkylmalate), dialkyltin dilaurate such as dibutyltin dilaurate and dioctyltin dilaurate, dibutyltin malate polymer, dioctyltin malate polymer, dibutyltin β-mercaptopropionate, dioctyltin β-mercaptopropionate, etc. can be used.

[0024] <Lubricant> The vinyl chloride resin composition may contain a lubricant, such as a higher alcohol such as lauryl alcohol or stearyl alcohol; a higher fatty acid such as stearic acid or palmitic acid; a higher fatty acid ester such as stearic acid ester or palmitic acid ester; a natural wax such as carnauba wax or candelilla wax; a synthetic wax such as methylenebisstearamide or ethylenebisstearamide; or butyl stearate.

[0025] <Other additives> In addition to the above-mentioned additives, this vinyl chloride resin composition may also contain other additives such as flame retardants, heat stabilizers, processing aids, ultraviolet absorbers, and plasticizers.

[0026] <Composition ratio> The vinyl chloride resin composition is not particularly limited, but it is preferable to blend it in the following proportions per 100 parts by mass of vinyl chloride resin: 0.2 to 2.0 parts by mass of zeolite, 2 to 10 parts by mass of impact modifier, 2.0 to 4.5 parts by mass of tin-based stabilizer, 1 to 4 parts by mass of lubricant, and 1 to 12 parts by mass of other additives; more preferably, it is blended in the following proportions: 0.2 to 1.5 parts by mass of zeolite, 2 to 5 parts by mass of impact modifier, 2.0 to 5.0 parts by mass of tin-based stabilizer, 1 to 5 parts by mass of lubricant, and 1 to 10 parts by mass of other additives. Furthermore, this vinyl chloride resin composition can be prepared using the same method as conventionally known vinyl chloride resin compositions.

[0027] <Physical properties of this polyvinyl chloride resin composition> This polyvinyl chloride resin composition, as measured by the average specific light reduction area measurement test of the cone calorie test shown below, yielded an average specific light reduction area (SEA) of 90 [m²] for each of the primary to quaternary polyvinyl chloride resin test specimens molded after four recycling cycles. 2 The value is less than or equal to [ / kg], and the average value of the average specific light reduction area of ​​each polyvinyl chloride resin test specimen from primary to quaternary is 80 [m²]. 2 It is less than / kg. By doing so, it is possible to prevent a decrease in flame retardancy even when this polyvinyl chloride resin composition is repeatedly used as a recycled material. From this perspective, the average specific light reduction area (SEA) of the primary to quaternary polyvinyl chloride resin test specimens is 90 [m²]. 2 It is preferable that it is less than or equal to 85[m 2 It is more preferable that the value is less than or equal to [ / kg]. Furthermore, the average value of the average specific light reduction area of ​​each polyvinyl chloride resin test specimen from primary to quaternary was 70 [m²]. 2 It is preferable that it is less than or equal to 65[m 2 It is more preferable that the value is less than or equal to [ / kg].

[0028] (Average relative light reduction area measurement test) As shown below, this polyvinyl chloride resin composition can be recycled four times to produce primary to quaternary polyvinyl chloride resin test specimens, and the average specific light reduction area (SEA) can be measured.

[0029] First, a primary vinyl chloride resin test specimen is formed using this vinyl chloride resin composition. The primary vinyl chloride resin test specimen can be, for example, a vinyl chloride resin sheet (plate) with a thickness of 3 mm formed by a calender press. Next, a primary vinyl chloride resin sheet is formed from the zero-order vinyl chloride resin test specimen, and multiple primary vinyl chloride resin sheets are stacked and pressed to form a primary vinyl chloride resin test specimen. Next, a secondary vinyl chloride resin sheet is prepared by mixing 70% by mass of the primary vinyl chloride resin test specimen and 30% by mass of the primary vinyl chloride resin sheet and molding it. Multiple secondary vinyl chloride resin sheets are then stacked and pressed to produce a secondary vinyl chloride resin test specimen. Next, a tertiary vinyl chloride resin sheet is prepared by mixing 70% by mass of the primary vinyl chloride resin test specimen and 30% by mass of the secondary vinyl chloride resin sheet and molding it. A tertiary vinyl chloride resin test specimen is then prepared by stacking multiple tertiary vinyl chloride resin sheets and pressing them together. Finally, a quaternary vinyl chloride resin sheet is produced by kneading and molding 70% by mass of the vinyl chloride resin test body and 30% by mass of the tertiary vinyl chloride resin sheet, and a plurality of quaternary vinyl chloride resin sheets are stacked and pressed to obtain a quaternary vinyl chloride resin test body.

[0030] The kneading of each sheet can be carried out, for example, using an 8-inch test roll and kneading at 190 °C for 5 minutes. It is preferable to cut each vinyl chloride resin sheet into strips or crush it into granules before kneading.

[0031] The average specific extinction area (SEA) is measured using each vinyl chloride resin test body from primary to quaternary, prepared as a molded body with a thickness of 3 mm by hot pressing, and measured using a cone calorimeter tester. Since the size of the sample of the cone calorimeter tester is 100 mm square, each vinyl chloride resin test body preferably has a size of 100 mm in length × 100 mm or more in width and is molded to a thickness of 3 mm. The cone calorimeter tester can use, for example, "Trade name cone calorimeter" manufactured by Toyo Seiki Seisakusho Co., Ltd., and the radiation amount from the heater is 50 kw / m 2 It can be measured by performing it for 12 minutes.

[0032] (Smoke density measurement test) Preferably, the average value of the smoke density of the vinyl chloride resin test bodies from primary to quaternary is 0.3 [1 / m] or less. By doing so, even if this vinyl chloride resin composition is repeatedly used as a recycled material, a decrease in flame retardancy can be prevented. From such a viewpoint, it is more preferable that the average value of the smoke density of the vinyl chloride resin test bodies from primary to quaternary is 0.3 [1 / m] or less, and particularly preferably 0.29 [1 / m] or less. The smoke density can be measured with a cone calorimeter tester.

[0033] (Picat softening temperature) The vinyl chloride resin composition is not particularly limited, but a Vicat softening temperature of 106°C or higher is preferred, 108°C or higher is more preferred, and 110°C or higher is particularly preferred. Furthermore, the upper temperature that can usually be achieved is considered to be around 130°C. The Picatto softening temperature can be measured, for example, according to the JIS K7206 B50 method.

[0034] <Molded body> This polyvinyl chloride resin composition can be molded into a polyvinyl chloride resin molded article by, for example, a calender press, an extrusion press, or a continuous extrusion press. The molded article is preferably in the form of a plate, sheet, or plate. Polyvinyl chloride resin molded articles can be suitably used as materials for, for example, interior and exterior equipment of transport aircraft such as aircraft, ships, and vehicles; interior and exterior materials of buildings; daily necessities such as furniture and office supplies; housing materials for home appliances and electronic equipment; and components of semiconductor devices. More specifically, they can be used as cover materials for enclosing liquid crystal manufacturing equipment.

[0035] The vinyl chloride resin molded article can be used as a recycled material after use. For example, it can be used as a recycled vinyl chloride resin composition by adding 5 to 40 parts by mass of recycled material to 100 parts by mass of this vinyl chloride resin composition. From the viewpoint of recycling, it is preferable to add 5 to 35 parts by mass of recycled material per 100 parts by mass of the vinyl chloride resin composition, and more preferably 5 to 30 parts by mass.

[0036] Recycled polyvinyl chloride resin molded products exhibit a suppressed decrease in flame retardancy compared to conventional products, ensuring the necessary flame retardancy even after repeated recycling.

[0037] The flame retardancy of polyvinyl chloride resin molded products (including recycled polyvinyl chloride resin molded products) is determined by the amount of radiation from a cone calorimeter heater at 50 kW / m². 2 By setting the parameters to 12 minutes, the measurement can be taken. The average rate of heat release (HRR) is 24 kW / m². 2 The following is preferable:

[0038] One indicator of flame retardancy is the evaluation criteria set by the Factory Mutual System. This evaluation standard uses indicators such as the fire spread index (FPI), smoke emission index (SDI), and corrosion index (CDI), which indicate the generation of corrosive gases, as measured based on the cleanroom materials flame retardancy test (FMRC, Clean Room Materials Flammability Test Protocol) listed as Class Number 4910 (collectively referred to as the FM standard).

[0039] The evaluation values ​​according to the FM standard are obtained when the party seeking the evaluation value submits a test specimen to a mutual insurance organization, and the mutual insurance organization evaluates this specimen. Therefore, it can be said that it is time-consuming and inefficient to obtain evaluation results. Therefore, instead of using evaluation values ​​based on FM standards, values ​​evaluated by combustion tests using a cone calorimeter, which can be performed by the person determining the evaluation values, may be used as indicators of flame retardancy.

[0040] The flame retardancy properties evaluated by combustion tests using a cone calorimeter are determined by the maximum amount of heat generated by combustion per unit area and unit time (also known as the maximum heat rate, or PHRR; unit: kW / m²). 2 ), average value (also written as average heat rate, AHRR; unit: kW / m 2 ), total heat generation (also written as THR; unit: MJ / m 2 ), the average value of the effective heat output (also written as average effective heat output or HOC; unit: MJ / m³) 2 ), the average rate of mass loss (also written as average mass loss rate, AMLR; unit: g / sec·m 2 ), the maximum luminescence reduction volume (also known as the maximum luminescence reduction volume or PSEA; unit: m 2 ( / g), average light-reducing volume (also written as average light-reducing volume, ASEA; unit: m 2 Examples include / g).

[0041] The fire spread index (FPI) according to the above FM standard has a strong correlation with evaluation values ​​related to calorific value, such as the maximum heat rate (PHRR), average heat rate (AHRR), and total heat rate (THR), which are measured by the above cone calorimeter tester. Furthermore, the smoke index (SDI) according to the above FM standard has a strong correlation with indices related to light reduction area, such as the maximum specific area attenuation (SEA) and average area attenuation (ASEA), which are measured by the above cone calorimeter tester. Furthermore, the corrosion index (CDI) according to the above FM standard has a strong correlation with indicators of mass loss, such as the average mass loss rate (AMLR) measured by the above cone calorimeter tester. Therefore, by evaluating flame retardancy using a cone calorimeter tester, it is possible to effectively obtain the FM standard index.

[0042] The Fire Prevention (FM) standard requires a fire spread index (FPI) of 6 or less and a smoke emission index (SDI) of 0.4 or less. For polyvinyl chloride resin molded articles (including recycled polyvinyl chloride resin molded articles), in order to obtain a value equivalent to or better than this FM standard, the maximum heat rate (PHRR) is 150 kW / m². 2 Below is the mean heat rate (AHRR) of 30 kW / m². 2 Below is the average total heat generation (THR) of 10 MJ / m³. 2 Below is the average effective heat of combustion (HOC) of 20 MJ / m³. 2 Below, average mass loss rate (AMLR) 0.09g / sec m 2 The following is preferable. In particular, average heat rate (AHRR) and average specific light-reducing area (SEA) are dominant in determining flame retardancy, so the average heat rate (AHRR) is set to 29 kW / m². 2 The following is the average effective heat of combustion (HOC) of 19 MJ / m³. 2 or less, and the average mass loss rate (AMLR) is 0.08g / sec m 2 The following is preferable:

[0043] This polyvinyl chloride resin composition can be reused repeatedly without a reduction in flame retardancy even after recycling, thus enabling the effective use of resources. [Examples]

[0044] An embodiment of the present invention will be described below. However, the present invention is not limited to this embodiment. In the following description, "parts" refers to "parts by mass".

[0045] [Example 1] 100 parts of post-chlorinated polyvinyl chloride resin (chlorination rate 68%, average degree of polymerization 600) were mixed with 3.5 parts of a tin-based stabilizer (manufactured by Nitto Kasei Co., Ltd., product name "TVS") and 0.3 parts of zeolite (apparent specific gravity 0.2-0.4 g / mL, average particle size 0.5-5.0 μm). The mixture was heated in a 10 L Henschel mixer to obtain a dry blend. This mixture was designated as the polyvinyl chloride resin composition (hereinafter referred to as the test composition), and a primary polyvinyl chloride resin test specimen measuring 240 mm in length, 240 mm in width, and 4 mm in thickness was prepared by molding it using an 8-inch test roll and a heated press. In this example, the apparent specific gravity of the zeolite was measured according to JIS K6721, and the average particle size is the value measured by laser diffraction.

[0046] The above-mentioned primary polyvinyl chloride resin test specimen was cut into strips, heated and kneaded at 190°C for 5 minutes, and a primary polyvinyl chloride resin sheet (0.5 mm thick) was prepared using an 8-inch test roll. Six of these sheets were stacked and hot-pressed at 190°C for 15 minutes at 3.5 MPa to produce a primary polyvinyl chloride resin test specimen (240 mm long x 240 mm wide x 3 mm thick). A combustion test was conducted using a cone calorimeter (product name: "Cone Calorimeter," manufactured by Toyo Seiki Seisakusho Co., Ltd.), and the average relative light reduction area was measured. The average relative light reduction area for the primary polyvinyl chloride resin test specimen was 78 m². 2 It was / kg.

[0047] Next, 70% by mass of a primary polyvinyl chloride resin specimen and 30% by mass of a primary polyvinyl chloride resin sheet were mixed using an 8-inch test roll at 190°C for 5 minutes to produce a secondary polyvinyl chloride resin sheet (thickness 0.5 mm). Six of these sheets were stacked and hot-pressed at 190°C for 15 minutes at 3.5 MPa to produce a secondary polyvinyl chloride resin specimen (length 240 mm × width 240 mm × thickness 3 mm). The average specific light reduction area of ​​the secondary polyvinyl chloride resin specimen was measured in the same manner as above, and the result was 41 m². 2 It was / kg.

[0048] Furthermore, 30% by mass of a secondary polyvinyl chloride resin sheet was mixed with 70% by mass of a primary polyvinyl chloride resin test specimen using an 8-inch test roll at 190°C for 5 minutes to produce a tertiary polyvinyl chloride resin sheet (thickness 0.5 mm). Six of these sheets were stacked and hot-pressed at 190°C for 15 minutes at 3.5 MPa to produce a tertiary polyvinyl chloride resin test specimen (length 240 mm x width 240 mm x thickness 3 mm). For the tertiary polyvinyl chloride resin test specimen, the average relative light reduction area was measured in the same manner as above, and the result was 46 m 2 It was / kg.

[0049] Finally, 70% by mass of primary polyvinyl chloride resin specimen and 30% by mass of tertiary polyvinyl chloride resin sheet were mixed using an 8-inch test roll at 190°C for 5 minutes to produce a quaternary polyvinyl chloride resin sheet (thickness 0.5 mm). Six of these sheets were stacked and hot-pressed at 190°C for 15 minutes at 3.5 MPa to produce a quaternary polyvinyl chloride resin specimen (length 240 mm x width 240 mm x thickness 3 mm). For the quaternary polyvinyl chloride resin test specimen, the average relative light reduction area was measured in the same manner as above, and the result was 44 m 2 It was / kg.

[0050] Figure 1 shows a graph plotting the average relative light reduction area against the number of regeneration cycles for each vinyl chloride resin test specimen using the vinyl chloride resin composition of Example 1. The slope of the approximate line in Example 1 was -9.9. The slope of the approximate line was calculated using the spreadsheet software Excel (Microsoft). Furthermore, the average value of the average specific light reduction area for each polyvinyl chloride resin test specimen was 52.4 kg / m². 2 That was the case.

[0051] The smoke concentration of each polyvinyl chloride resin test specimen from primary to quaternary was measured using a cone calorie tester. The average value was 0.22 [1 / m]. Furthermore, the Picatto softening temperature of the vinyl chloride resin composition of Example 1 was measured according to the JIS K7206 B50 method and was found to be 113°C.

[0052] [Example 2] Except for adding 2.8 parts of a tin-based stabilizer (trade name TVS, manufactured by Nitto Kasei Co., Ltd.) and 1 part of zeolite (apparent specific gravity 0.2-0.4 g / mL, average particle size 0.5-5.0 μm) to the test composition used in Example 1, primary to quaternary polyvinyl chloride resin test specimens were prepared in the same manner as in Example 1, and the average specific light reduction area was measured. The results are shown below. Primary: 47kg / m 2 Secondary: 40kg / m 2 Tertiary: 37kg / m 2 Quaternary: 48kg / m 2

[0053] Figure 1 shows a graph plotting the average relative light reduction area against the number of regeneration cycles for each vinyl chloride resin test specimen when using the vinyl chloride resin composition of Example 2. In Example 2, the slope of the approximate straight line was -0.004. Furthermore, the average value of the average specific light reduction area for each polyvinyl chloride resin test specimen was 42.9 kg / m². 2 That was the case.

[0054] The average smoke concentration of each polyvinyl chloride resin test specimen from the first to the fourth stage was 0.16 [1 / m]. Furthermore, the Picatto softening temperature of the vinyl chloride resin composition of Example 2 was measured according to the JIS K7206 B50 method and was found to be 114°C.

[0055] [Comparative Example 1] Except for changing the post-chlorinated polyvinyl chloride resin to 66% and the average degree of polymerization to 700 in the test composition of Example 1, primary to quaternary polyvinyl chloride resin test specimens were prepared in the same manner as in Example 1, and the average specific light reduction area was measured.

[0056] The average specific light reduction area of ​​the primary to quaternary polyvinyl chloride resin test specimens in Comparative Example 1 was as follows: Primary: 125kg / m 2 Secondary: 141kg / m 2 Tertiary: 128kg / m 2 Quaternary: 91kg / m 2

[0057] Figure 1 shows a graph plotting the average relative light reduction area against the number of regeneration cycles for each vinyl chloride resin test specimen when using the vinyl chloride resin composition of Comparative Example 1. The slope of the approximate straight line in Comparative Example 1 was -11.3. Furthermore, the average value of the average specific light reduction area for each polyvinyl chloride resin test specimen was 121.3 kg / m². 2 That was the case.

[0058] The average smoke concentration of each polyvinyl chloride resin test specimen from the first to the fourth stage was 0.31 [1 / m]. Furthermore, the Picatto softening temperature of the vinyl chloride resin composition of Comparative Example 1 was measured according to the JIS K7206 B50 method and was found to be 103°C.

[0059] The results of each measurement are shown in Table 1 below.

[0060] [Table 1]

[0061] [Test Results] Examples 1 and 2 demonstrate superior flame retardancy even after repeated recycling, as the average light reduction area does not decrease even with an increased number of regeneration cycles, compared to Comparative Example 1. The smoke concentration in Examples 1 and 2 was also lower compared to Comparative Example 1, which further demonstrates their superior flame retardancy. Furthermore, comparing Example 1 and Example 2, it was confirmed that the average relative light reduction area of ​​Example 2 did not decrease as the number of regeneration cycles increased, and that the flame retardancy was even better when a larger amount of zeolite was included.

Claims

1. In a vinyl chloride resin composition, when primary to quaternary vinyl chloride resin test specimens are prepared by following the procedures (1) to (4) shown below, the average specific light reduction area of ​​the primary to quaternary vinyl chloride resin test specimens is 90 [m²]. ２ The value is less than or equal to [ / kg], and the average value of the average specific light reduction area of ​​each of the primary to quaternary polyvinyl chloride resin test specimens is 80 [m²]. ２ A vinyl chloride resin composition having a density of less than or equal to [ / kg]. (1) A vinyl chloride resin test specimen is molded using the vinyl chloride resin composition, a primary vinyl chloride resin sheet is prepared from the vinyl chloride resin test specimen, and a primary vinyl chloride resin test specimen made from the primary vinyl chloride resin sheet is molded. (2) A secondary vinyl chloride resin sheet is prepared by mixing 70% by mass of the vinyl chloride resin test specimen and 30% by mass of the primary vinyl chloride resin sheet and molding it, and a secondary vinyl chloride resin test specimen made of the secondary vinyl chloride resin sheet is molded. (3) A tertiary vinyl chloride resin sheet is prepared by mixing 70% by mass of the vinyl chloride resin test specimen and 30% by mass of the secondary vinyl chloride resin sheet and molding it, and a tertiary vinyl chloride resin test specimen made of the tertiary vinyl chloride resin sheet is molded. (4) A quaternary vinyl chloride resin sheet is prepared by mixing 70% by mass of the vinyl chloride resin test specimen and 30% by mass of the tertiary vinyl chloride resin sheet and molding it, and a quaternary vinyl chloride resin test specimen is formed from the quaternary vinyl chloride resin sheet.

2. The vinyl chloride resin composition according to claim 1, wherein the average value of the smoke concentrations of each of the primary to quaternary vinyl chloride resin test specimens is 0.3 [1 / m] or less.

3. The vinyl chloride resin composition according to claim 1, wherein vinyl chloride resin with a chlorination rate of 67% or more is used as a raw material.

4. The vinyl chloride resin composition according to claim 3, further containing zeolite.

5. A vinyl chloride resin molded article formed using the vinyl chloride resin composition described in any one of claims 1 to 4.

6. A vinyl chloride resin plate, wherein the vinyl chloride molded body according to claim 5 is in the shape of a plate.

Images