JP2015151494A - flame-retardant resin composition and molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame-retardant resin composition that has improved flame retardancy while favorably maintaining mechanical characteristics such as tensile characteristics.SOLUTION: A flame-retardant resin composition comprises a polymer saponified material (A) obtained by alkali saponification of a copolymer of ethylene and unsaturated carboxylic acid ester, metalhydroxide (B), and dimer acid (C).

Description

  The present invention relates to a flame retardant resin composition and a molded body.

  Conventionally, techniques for improving the flame retardancy of resin materials suitable for applications requiring flame retardance have been widely studied.

  As one of techniques for improving flame retardancy, an example in which a compound called a so-called flame retardant is contained has been proposed. As an example of the flame retardant, an inorganic flame retardant such as a metal hydroxide such as aluminum hydroxide is known (for example, see Patent Document 1).

  On the other hand, as a resin material suitable for applications requiring flame retardancy, a technique is disclosed in which a predetermined amount of water is contained in a potassium ionomer of an ethylene / unsaturated carboxylic acid copolymer without blending a flame retardant. (For example, refer to Patent Document 1).

JP 2009-84324 A

  However, metal hydroxides known as so-called flame retardants are usually contained as particulate filler components, so that the flame retardants are unevenly distributed locally without being sufficiently diffused into the resin. The desired flame retardant effect may not be expected.

  Moreover, in order to express more excellent flame retardancy, it is necessary to contain a large amount of flame retardant with respect to the amount of resin, but when the amount of flame retardant is excessive, when molded into a sheet or the like There is a problem that mechanical properties such as tensile properties cannot be maintained.

  The present invention has been made in view of the above, and an object of the present invention is to provide a flame-retardant resin composition having high flame retardancy and a molded product thereof while maintaining good mechanical properties such as tensile properties. An object is to achieve the object.

Specific means for achieving the above-described problems are as follows.
<1> Difficult to contain a polymer saponified product (A) obtained by alkali saponifying a copolymer of ethylene and an unsaturated carboxylic acid ester, a metal hydroxide (B), and a dimer acid (C) It is a flammable resin composition.

  <2> The flame retardant resin composition according to <1>, wherein the polymer saponified product (A) is a potassium saponified product saponified with potassium.

  <3> The <1> or <2 above, wherein the content ratio (B / A [mass ratio]) of the metal hydroxide (B) to the polymer saponified product (A) is 10% by mass to 200% by mass. > Is a flame-retardant resin composition.

  <4> The flame-retardant resin composition according to any one of <1> to <3>, wherein the unsaturated carboxylic acid ester is an alkyl ester having 1 to 8 carbon atoms of an unsaturated carboxylic acid. is there.

  <5> The flame-retardant resin composition according to <4>, wherein the unsaturated carboxylic acid is at least one of acrylic acid and methacrylic acid.

  <6> The difficulty according to any one of <1> to <5>, wherein the proportion of the structural unit derived from the unsaturated carboxylic acid ester in the copolymer is 5% by mass to 50% by mass. It is a flammable resin composition.

  <7> A molded body molded using the flame retardant resin composition according to any one of <1> to <6>.

  ADVANTAGE OF THE INVENTION According to this invention, the flame-retardant resin composition which has high flame retardance, and its molded object are provided, maintaining mechanical characteristics, such as a tensile characteristic, favorable.

Hereinafter, the flame-retardant resin composition of the present invention and a molded body using the same will be described in detail.
The flame retardant resin composition of the present invention comprises a polymer saponified product (A) obtained by alkali saponifying a copolymer of ethylene and an unsaturated carboxylic acid ester, a metal hydroxide (B), a dimer acid ( And C). Moreover, the flame-retardant resin composition of this invention can be further comprised using other components, such as an additive, as needed.

Conventionally, metal hydroxides such as magnesium hydroxide and aluminum hydroxide have been known as flame retardants. However, since they are generally contained as particulate fillers, they tend to be unevenly distributed in the resin and have a desired flame retardant effect. There are things I can't expect. In addition, if a large amount is contained in the resin in anticipation of a flame retardant effect, mechanical properties may be impaired, such as cracking when bending stress or tensile force is applied. In view of such circumstances, in the present invention,
A polymer saponified product obtained by alkali saponifying a copolymer of ethylene and an unsaturated carboxylic acid ester is contained together with a metal hydroxide and a dimer acid (C). As a result, the saponified product is responsible for enhancing the dispersibility of the metal hydroxide, and by exhibiting the effect of increasing the dispersibility by the dimer acid, the metal hydride is compared with the composition containing no saponified product and dimer acid. The flame retardant effect due to the inclusion of objects is dramatically improved. Therefore, an excellent flame retardant effect is obtained without including a large amount of metal hydroxide, and the mechanical properties are excellent while ensuring an excellent flame retardant effect.

Hereinafter, each component which comprises the flame-retardant resin composition of this invention is explained in full detail.
-(A) Saponified polymer-
The flame-retardant resin composition of the present invention is a polymer obtained by alkali saponification of a copolymer of ethylene and an unsaturated carboxylic acid ester (hereinafter also referred to as “ethylene / unsaturated carboxylic acid ester copolymer”). Contains at least one saponified product (hereinafter also simply referred to as “polymer saponified product”).
By selectively containing a polymer saponified product as a resin component constituting the resin composition, a metal hydroxide that is a particulate material can be contained in a good dispersion state. Thereby, the outstanding flame-retardant effect is expressed.

  The ethylene / unsaturated carboxylic acid ester copolymer in the present invention is a copolymer obtained by copolymerizing ethylene and an unsaturated carboxylic acid, and the polymer structure is composed of at least a structural unit derived from ethylene and unsaturated. And a structural unit derived from a carboxylic acid ester.

  The saponified polymer in the present invention is obtained by saponifying an ester component present in a copolymer obtained by copolymerizing ethylene and an unsaturated carboxylic acid ester with an alkali metal to partially convert the ester component to a potassium salt. In that respect, the molecular structure differs from that of ionomers. The polymer saponified product is a compound having no acid site in the molecule. On the other hand, an ionomer is a compound in which an acid is present in a copolymer structure and a part of the acid in the molecule is neutralized with an alkali metal to form a salt, but the acid is present in the structure.

As unsaturated carboxylic acid ester in this invention, you may contain not only single 1 type but combining multiple types. That is,
When the unsaturated carboxylic acid ester is used alone, the flame retardant resin composition of the present invention is a binary copolymer obtained by copolymerizing ethylene and one unsaturated carboxylic acid ester as a polymer saponified product. A combined saponified product may be contained.
When two or more kinds of unsaturated carboxylic acid esters are used, the flame retardant resin composition of the present invention is a ternary obtained by copolymerizing ethylene and two kinds of unsaturated carboxylic acid esters as a polymer saponified product. A saponified product of a copolymer may be contained.

  As the polymer saponified product in the present invention, for example, a binary copolymer obtained by copolymerizing ethylene and an alkyl ester of an unsaturated carboxylic acid is preferably exemplified. The copolymer may be any of a random copolymer, a block copolymer, a graft copolymer, and the like.

Examples of the unsaturated carboxylic acid of the unsaturated carboxylic acid ester include acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, and itaconic anhydride.
Among them, the unsaturated carboxylic acid is preferably at least one of acrylic acid and methacrylic acid.

  Examples of the alkyl moiety of the alkyl ester include alkyl having 1 to 12 carbon atoms. Specific examples of the alkyl moiety include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, secondary butyl, 2-ethylhexyl, isooctyl and the like. The alkyl moiety of the alkyl ester is preferably an alkyl having 1 to 8 carbon atoms.

  Examples of the alkyl ester of unsaturated carboxylic acid include acrylic acid alkyl ester, methacrylic acid alkyl ester, crotonic acid alkyl ester, maleic acid alkyl ester and the like.

  Among the above, the unsaturated carboxylic acid ester in the present invention is particularly preferably methyl ester, ethyl ester, normal butyl ester, or isobutyl ester of acrylic acid or methacrylic acid.

  In this invention, when unsaturated carboxylic acid has a some carboxy group (acid group) in 1 molecule, the unsaturated carboxylic acid ester by which all the carboxy groups were alkylesterified is included. Therefore, even when the degree of saponification is not 100%, there is no acid group, and there is an ester group. Therefore, when using other resin together, the effect that the compatibility with a polymer saponified material (A) and various thermoplastic resins (for example, styrene resin etc.) improves is acquired.

As the ethylene / unsaturated carboxylic acid ester copolymer constituting the saponified polymer, a random copolymer is preferable, and a binary random copolymer obtained by copolymerizing ethylene and (meth) acrylic acid ester is particularly preferable. preferable.
Examples of such binary random copolymers include ethylene / methyl acrylate random copolymers, ethylene / ethyl acrylate random copolymers, ethylene / normal butyl acrylate random copolymers, ethylene / isobutyl acrylate. Random copolymers, ethylene / methyl methacrylate random copolymers, ethylene / ethyl methacrylate random copolymers, ethylene / normal butyl methacrylate random copolymers, ethylene / isobutyl methacrylate random copolymers, and the like.

  The content ratio of the structural unit derived from the unsaturated carboxylic acid ester in the ethylene / unsaturated carboxylic acid ester copolymer before saponification is 5 with respect to all the structural units constituting the ethylene / unsaturated carboxylic acid ester copolymer. % By mass to 50% by mass is preferable, and 20% by mass to 35% by mass is more preferable. When the content ratio of the structural unit derived from the unsaturated carboxylic acid ester is in the above range, it is preferable in terms of a large effect of improving the dispersibility of the metal hydroxide, and the miscibility with the dimer acid is excellent.

  The melt flow rate (MFR; JIS K7210-1999 (190 ° C., 2160 g load)) of the ethylene / unsaturated carboxylic acid ester copolymer before saponification is preferably in the range of 1 g / 10 min to 1300 g / 10 min.

  The ethylene / unsaturated carboxylic acid ester copolymer before saponification may be used alone or in combination of two or more to form a polymer saponified product.

  The ethylene / unsaturated carboxylic acid ester copolymer can be produced, for example, by high-pressure radical copolymerization.

  The polymer saponified product in the present invention is obtained by alkali saponification of an ethylene / unsaturated carboxylic acid ester copolymer. Examples of the caustic alkali metal species used for saponification include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). Of these, sodium, potassium, rubidium, and cesium are preferable, and sodium and potassium are preferable from the viewpoint of hygroscopicity and availability of raw materials, and potassium is preferable because it is particularly excellent in hygroscopicity.

  The melt flow rate (MFR; 230 ° C., 10 kg load, conforming to JIS K7210-1999) of the saponified polymer in the present invention is 0.01 g / 10 min to 100 g / 10 min in terms of moldability and workability. Preferably, 0.1 g / 10 min to 50 g / 10 min is more preferable, and 0.1 g / 10 min to 5 g / 10 min is more preferable. When the MFR is 0.01 g / 10 min or more, the molding process becomes better, and when it is 100 g / 10 min or less, the mechanical strength becomes better.

As the polymer saponification product, the ratio of the molar amount of alkali metal present after saponification to the total molar amount of the structural units derived from the unsaturated carboxylic acid ester in the ethylene / unsaturated carboxylic acid ester copolymer before saponification is It is preferable that it is 0.1-0.6, ie, a saponification degree is 10%-60%. A more preferable saponification degree is 20% to 50%.
When the degree of saponification is within the above range, it is advantageous in terms of dispersion of metal hydroxide and mechanical properties, and it is excellent in miscibility with dimer acid when dimer acid is used in combination.

  Since the ester component in the copolymer is partially changed to an alkali salt component by the saponification reaction with an alkali, the saponified product is a structural unit derived from ethylene, a structural unit derived from an unsaturated carboxylic acid ester, or an unsaturated carboxylic acid. It becomes a copolymer having a structural unit derived from an alkali salt and does not contain a free carboxyl group.

  The alkali saponification of the ethylene / unsaturated carboxylic acid ester copolymer can be carried out by a known method using caustic alkali or the like. For example, an ethylene / unsaturated carboxylic acid ester copolymer and a predetermined amount of caustic such as potassium hydroxide are mixed at a temperature of, for example, 100 ° C. to 250 ° C. with a kneading apparatus (for example, an extruder, a kneader, a Banbury mixer, etc.). Can be carried out by melt mixing. Further, after the ethylene / unsaturated carboxylic acid ester copolymer is melted and homogenized by the kneading apparatus, a predetermined amount of caustic alkali such as potassium hydroxide is added to the ethylene / unsaturated carboxylic acid ester copolymer. The saponified product may be obtained by reacting the ester moiety with caustic.

  As content in the flame-retardant resin composition of a polymer saponification thing, 33 mass%-90 mass% are preferable with respect to the total solid content mass of a flame-retardant resin composition. When the content of the polymer saponified product is 33% by mass or more, good mechanical strength can be obtained. Moreover, since content of a polymer saponification thing is 90 mass% or less, while being able to ensure the melt fluidity as a flame-retardant resin composition, melt fluidity can be maintained favorable. The content of the polymer saponified product is more preferably 40% by mass to 80% by mass, and still more preferably 50% by mass to 70% by mass with respect to the total solid mass of the flame retardant resin composition.

-(B) Metal hydroxide-
The flame retardant resin composition of the present invention contains at least one metal hydroxide. The metal hydroxide has a flame retarding action, and the flame retarding action is more effectively expressed by containing it together with the above-described polymer saponified product.

  Examples of the metal hydroxide include magnesium hydroxide, aluminum hydroxide, calcium hydroxide and the like.

  As content in the flame retardant resin composition of a metal hydroxide, 20 mass%-70 mass% are preferable with respect to the total mass of a flame retardant resin composition, and 30 mass%-50 mass% are more. preferable. When the content of the metal hydroxide is 20% by mass or more, a desired flame retardant effect can be expected, and the flame retardant (oxygen index) can be improved when used in combination with the aforementioned polymer saponified product. Excellent. If the content of the metal hydroxide is 70% by mass or less, it is advantageous in terms of processing.

The content ratio (B / A [mass ratio]) of the metal hydroxide (B) to the polymer saponified product (A) is preferably 10% by mass to 200% by mass. When B / A is 10% by mass or more, that is, within a range where the amount of metal hydroxide is not too small, a good flame retardant effect can be expected. In addition, when B / A is 200% by mass or less, that is, within a range in which the amount of metal hydroxide is not too large, a good flame retardant effect can be obtained without impairing mechanical strength.
Especially, as B / A, 10 mass%-100 mass% are more preferable, 20 mass%-70 mass% are still more preferable, 30 mass%-50 mass% are still more preferable.

-(C) Dimer acid-
The flame retardant resin composition of the present invention contains at least one dimer acid. By further containing the dimer acid, the dimer acid itself has combustibility, but the dispersibility of the metal hydroxide in the polymer saponified product is further increased, and as a result, more excellent flame retardancy is obtained.

Dimer acid is a polyvalent carboxylic acid obtained by polymerization reaction of two or more molecules of unsaturated fatty acid, and is usually obtained as a mixture of two or more kinds containing monomers (one molecule) of unsaturated fatty acid. It is used for various applications as a mixture.
Dimer acid is obtained by dimerizing a linear or branched unsaturated fatty acid having 8 to 22 carbon atoms, and derivatives thereof are also included. Examples of the dimer acid derivative include a hydrogenated product. Specifically, hydrogenated dimer acid obtained by hydrogenating the dimer acid and reducing the unsaturated bond contained therein can be used.
By containing the dimer acid together with the polymer saponified product (A), the fluidity of the polymer saponified product (A) is improved.

  The dimer acid may be, for example, 3-octenoic acid, 10-undecenoic acid, oleic acid, linoleic acid, elaidic acid, palmitoleic acid, linolenic acid, or a mixture of two or more thereof, or these which are commercially available The raw material may be a tall oil fatty acid, soybean oil fatty acid, palm oil fatty acid, rice bran oil fatty acid, linseed oil fatty acid or the like, which is a mixture of unsaturated carboxylic acids. These dimer acids may contain a small amount of monomeric acid or trimer acid.

  Conventionally, dimer acid can usually be produced by dimerizing unsaturated fatty acids such as tall oil fatty acid at high temperature using montmorillonite clay as a catalyst.

  Specific examples of the dimer acid include a chain dimer acid represented by the following structural formula (1), a cyclic dimer acid represented by the following structural formula (2) or (3), and a mixture thereof.

  As the dimer acid, a commercially available product may be used. Examples of the commercially available product include Halidimer 200, 300 (manufactured by Harima Kasei Co., Ltd.), Tsunodim 205, 395 (Tsukino Food Industry Co., Ltd.). Enpol 1026, 1028, 1061, 1062 [manufactured by Cognis Co., Ltd.], and hydrogenated dimer acid include, for example, Empol 1008, 1012 [manufactured by Cognis Co., Ltd.], and the like.

The flame-retardant resin composition of the present invention has a dimer acid (C) content (C / (A + C)) of 1% by mass to the total mass of the polymer saponified product (A) and the dimer acid (C). It is preferable that it is 50 mass%.
When the content of dimer acid (C) is 1% by mass or more with respect to the total mass of polymer saponified product (A) and dimer acid (C), polymer saponified product (A in the flame-retardant resin composition (A ) Can be further improved in dispersibility of the metal hydroxide, and the flame retardancy of the resin composition can be further improved. When the content of dimer acid (C) is 50% by mass or less with respect to the total mass of polymer saponified product (A) and dimer acid (C), the melt fluidity of polymer saponified product (A) is molded. It is possible to make it an appropriate range.
The content of the dimer acid (C) with respect to the total mass of the polymer saponified product (A) and the dimer acid (C) is preferably 2% by mass to 30% by mass, more preferably 3% by mass to 15% by mass. is there.
When the content ratio of the dimer acid (C) is in the above range, the content ratio of the metal hydroxide (B) can be increased, and the total amount of the polymer saponified product (A) and the dimer acid (C) is increased. The content ratio (mass ratio) of the metal hydroxide (B) can be adjusted to a range of B: (A + C) = 40: 100 to 70: 100. More preferably, B: (A + C) = 45: 100 to 65: 100.

  When the polymer saponified product (A) and the dimer acid (C) are melt-mixed, the alkali metal in the polymer saponified product reacts with a part or all of the carboxy groups in the dimer acid to react with the dimer acid. Alkali metal salt structures can be formed. For this reason, the dimer acid can include an aspect of blending with a polymer saponified product in the form of a dimer acid alkali metal salt, or an aspect of blending in a mixed form of a dimer acid and an alkali metal dimer acid salt.

In addition, the flame retardant resin composition of the present invention includes not only a dimer acid alkali metal salt obtained by reacting an alkali metal in a polymer saponified product with a part or all of carboxy groups in a dimer acid, but also Another dimer acid alkali metal salt may be included. Dimer acid metal salts other than alkali metals may be included.
The dimer acid metal salt that does not go through the above reaction can be produced by contacting and heating a commercially available dimer acid and a metal compound. Examples of the metal constituting the metal compound include alkali metals such as sodium, potassium, lithium, rubidium and cesium, alkaline earth metals such as magnesium, and zinc. As the metal compound, oxides, carbonates, hydroxides, and the like of these exemplified metals can be used. By causing the dimer acid to react with the metal compound, a part or all of the carboxyl group of the dimer acid becomes a metal salt. Dimer acid alkali metal salts include dimer acid lithium salt (including partial salt), dimer acid sodium salt (including partial salt), dimer acid potassium salt (including partial salt), dimer acid rubidium salt (including partial salt) ) And dimer acid cesium salts (including partial salts).

-Various additives-
The flame retardant resin composition of the present invention further includes an ultraviolet absorber, a light stabilizer, an antioxidant, an antioxidant, a heat stabilizer, a lubricant, an antiblocking agent, a plasticizer, an adhesive, an inorganic filler, Reinforcing fibers such as glass fibers and carbon fibers, pigments, dyes, flame retardants, flame retardant aids, foaming agents, foaming aids and the like may be contained. Also, other antistatic agents known as resin additives can be blended.

Examples of the ultraviolet absorber include 2-hydroxy-4-methoxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxy-2-carboxybenzophenone, and 2-hydroxy-4- benzophenone series such as n-octoxybenzophenone; 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) benzotriazole, 2- (2′-hydroxy-5-methylphenyl) benzotriazole, and Examples include benzotriazoles such as 2- (2′-hydroxy-5-t-octylphenyl) benzotriazole; salicylic acid esters such as phenyl salicylate and p-octylphenyl salicylate.
Examples of the light stabilizer include hindered amines.
Examples of the antioxidant include various hindered phenols and phosphites.

  The molded article of the present invention is molded using the above-described flame retardant resin composition of the present invention. Preferable examples of the molded body of the present invention include extrusion molded products, press molded products, and injection molded products.

The manufacturing method of the molded object of this invention can be set as the structure which supplies the flame-retardant resin composition of this invention as stated above, and shape | molds under pressure. For example, a flame retardant resin composition can be supplied to form a film, and the resulting film can be pressure bonded to produce a molded body.
The method for supplying the flame retardant resin composition during film formation is not particularly limited as long as the flame retardant resin composition can be supplied after being melted, and examples thereof include an injection molding method and a melt extrusion molding method. Moreover, as a method of shape | molding under pressure, the method of heat-pressing by pressing into a desired metal mold | die etc. or pressing a hot plate from on the formed film | membrane etc. is mentioned.

  As described above, the flame-retardant resin composition of the present invention is excellent in flame retardancy, and the molded article of the present invention using the flame-retardant resin composition also has flame retardancy. Therefore, it can be widely used for building materials such as ceiling materials and floor materials, civil engineering materials, automobile parts, OA equipment, home appliance parts, storage cases or storage cases for these materials and parts, stationery, daily necessities, etc. it can.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples unless it exceeds the gist thereof. Unless otherwise specified, “part” is based on mass.

  The melt flow rate (MFR) was measured at 190 ° C. under a load of 2160 g by a method based on JIS K7210-1999.

1. Raw material preparation-A. Ethylene / unsaturated carboxylic acid ester copolymer and saponified product thereof
(1) EEA1: ethylene / ethyl acrylate random copolymer (ethyl acrylate (EA) content: 34% by mass, MFR (190 ° C., 2160 g load): 25 g / 10 min)
(2) EEA2: Ethylene / ethyl acrylate random copolymer (ethyl acrylate (EA) content: 25% by mass, MFR (190 ° C., 2160 g load): 25 g / 10 min)

(3) Polymer saponified product A1-A
50 mol% potassium saponified product of EEA1 (ethylene / ethyl acrylate random copolymer) (MFR (230 ° C., 10 kg load): 0.6 g / 10 min)

Hereinafter, the manufacture example of said polymer saponification thing A1-A is shown.
(Production of polymer saponified product A1-A)
As a base resin, 10 kg of ethylene / ethyl acrylate random copolymer (EEA1) and 1.14 kg of potassium hydroxide (KOH) are fed to a kneading apparatus, and EEA1 and potassium hydroxide (KOH) are melted in the kneading apparatus. Polymer saponified product A1-A was obtained by reacting and extruding. The potassium ion concentration (K ion amount) present in the form of potassium acrylate in the saponified polymer was 2.04 mol / kg, and the total amount of the ethylene / ethyl acrylate random copolymer (EEA1) before saponification was as follows. The ratio (saponification rate) of the molar amount of the alkali metal ions present in the saponified product to the molar amount of the acrylate group unit was 50%.

-B. Metal hydroxide
Magnesium hydroxide [Mg (OH) ₂ ] (powder, particle size: 1.0 μm, fatty acid treated product)

-C. Dimer acid
Dimer acid (C1): Tsunodim 395 [manufactured by Tsukino Food Industry Co., Ltd.]
(Component composition: dimer acid 76.2 mass%, monomer acid 10 mass%, trimer acid 13.8 mass%)

2. Preparation of Flame Retardant Evaluation Sheet / Mechanical Strength Measurement Sample Using a pressure kneader (Mix Lab ML-500, manufactured by Moriyama Co., Ltd.) with a capacity of 500 cm ³ , the components having the composition shown in Table 1 below are introduced into the raw material inlet. The mixture was kneaded at a temperature of 230 ° C. and a rotation speed of 50 min ^{−1 for} 10 minutes to prepare a kneaded product. Subsequently, the obtained kneaded material is sequentially used and press-molded at a temperature condition of 200 ° C. with a press-molding machine, so that a flame-retardant evaluation sheet with a thickness of 3 mm and a tensile with a thickness of 1 mm as a mechanical strength measurement sample are obtained. A strength measurement sheet was prepared.

3. Evaluation The following measurement and evaluation were performed for each of the flame retardant evaluation sheet and the tensile strength measurement sheet obtained above. The results of measurement and evaluation are shown in Table 1 below.

(Flame retardance)
Each flame retardant evaluation sheet is subjected to a combustion test using a candle method combustion tester (D-2 type: manufactured by Toyo Seiki Seisakusho Co., Ltd.) according to JIS K7201-1995, and an oxygen index is measured. did. Flame retardancy was evaluated using the measured oxygen index as an index.
The oxygen index indicates that, for example, an oxygen index of 25 is combustible at an oxygen concentration of 25%, and thus a larger value indicates better flame retardancy (that is, higher flame retardancy).

(Tensile properties)
For each of the tensile strength measurement sheets, a test piece was punched out in accordance with JIS K6251-2010 dumbbell No. 3, and the obtained test piece was pulled at a speed of 200 mm / min. Tensile strength at break (MPa)) and elongation at break (elongation at break; [%]) were measured.
In addition, the elongation rate exceeding 350% indicates extremely excellent practicality.

As shown in Table 1, in Example 1, the oxygen index was large and excellent flame retardancy was exhibited as compared with a comparative example containing a copolymer other than a saponified product as a resin component. Further, Example 1 was able to achieve more excellent flame retardancy and elongation than Comparative Example 5 not containing dimer acid.
In Comparative Example 6, a relatively large amount of metal hydroxide was included, but since dimer acid was not included, the viscosity when mixing each component was extremely high, making it impossible to prepare a kneaded product.

  The flame-retardant resin composition of the present invention is used in fields requiring flame retardancy, such as articles used in laboratories (curtains, etc.), toys, artificial turf, mats, waterproof sheets, home appliances, and automobile interior parts. It can utilize suitably for.

Claims (7)

A polymer saponified product (A) obtained by alkaline saponification of a copolymer of ethylene and an unsaturated carboxylic acid ester;
Metal hydroxide (B),
Dimer acid (C),
Containing flame retardant resin composition.   The flame retardant resin composition according to claim 1, wherein the polymer saponified product (A) is a potassium saponified product saponified with potassium.   The difficulty according to claim 1 or 2, wherein a content ratio (B / A [mass ratio]) of the metal hydroxide (B) to the polymer saponified product (A) is 10% by mass to 200% by mass. A flammable resin composition.   The flame retardant resin composition according to any one of claims 1 to 3, wherein the unsaturated carboxylic acid ester is an alkyl ester having 1 to 8 carbon atoms of an unsaturated carboxylic acid.   The flame retardant resin composition according to claim 4, wherein the unsaturated carboxylic acid is at least one of acrylic acid and methacrylic acid.   The flame retardant resin composition according to any one of claims 1 to 5, wherein a proportion of the structural unit derived from the unsaturated carboxylic acid ester in the copolymer is 5% by mass to 50% by mass. .   The molded object shape | molded using the flame-retardant resin composition of any one of Claims 1-6.