JP6343654B1 - Resin composition and molded product - Google Patents

Abstract

A chlorinated vinyl chloride resin composition and a molded article excellent in thermal stability are provided. The chlorinated vinyl chloride resin composition of the present invention comprises 100 parts by mass of a chlorinated vinyl chloride resin having a chlorine content of 58% by mass or more and a Zn-Al type hydrotal having 0.01% by mass or more. Including sites. [Selection figure] None

Description

  The present invention relates to a chlorinated vinyl chloride resin composition and a molded article.

  A molded article made of a vinyl chloride resin (PVC) composition has excellent water resistance, acid resistance, alkali resistance, flame resistance and electrical insulation, and is inexpensive. Therefore, the vinyl chloride resin composition is used for various uses such as building members, pipework equipment, and housing materials. However, a molded article made of a vinyl chloride resin composition is easily decomposed by generation of hydrogen chloride due to elimination of chlorine and hydrogen in the molecule due to heat, ultraviolet rays or oxygen. When such decomposition occurs, the physical properties deteriorate and the color changes from yellow to brown.

  In order to prevent such deterioration and discoloration, a stabilizer is added to the vinyl chloride resin composition. As the stabilizer, for example, a metal soap containing cadmium, an organic tin compound, a lead compound, or a mixture thereof is used. However, heavy metals other than zinc, such as cadmium, tin or lead, are concerned about their high toxicity and environmental impact. Therefore, in recent years, resin molded products using the above-described stabilizer not containing heavy metals have been proposed. For example, Patent Document 1 describes a halogen-containing resin composition in which a halogen-containing resin contains a composite of acidic clay and / or activated clay and a calcium hydroxide compound.

JP 2008-214466 A

  By the way, the normal heat-resistant temperature of the molded article made of the vinyl chloride resin composition is in the range of about 60 ° C. to 80 ° C. This temperature is lower than the normal heat-resistant temperature of a molded product made of a general-purpose thermoplastic resin other than the vinyl chloride resin composition, for example, polystyrene or polyethylene. Therefore, the vinyl chloride resin composition may improve the heat resistance of the molded product by chlorination. Such a chlorinated vinyl chloride resin composition, that is, a chlorinated vinyl chloride resin (CPVC) composition has a softening temperature higher than that of the vinyl chloride resin composition. Therefore, the molded product of the chlorinated vinyl chloride resin can be used as, for example, hot water or steam piping.

  An object of the present invention is to provide a chlorinated vinyl chloride resin composition and a molded article excellent in thermal stability.

According to the first aspect of the present invention, 100 parts by mass of a chlorinated vinyl chloride resin having a chlorine content of 58% by mass or more, a Zn-Al hydrotalcite having 0.01% by mass or more, a zinc carboxylate, a carvone A heat stabilizer comprising an acid alkali metal salt or carboxylic acid alkaline earth metal salt, a polyhydric alcohol, and an inorganic compound, the inorganic compound comprising calcium hydroxide, magnesium hydroxide, sodium perchlorate, perchloric acid There is provided a chlorinated vinyl chloride resin composition that is at least one selected from the group consisting of potassium, lithium perchlorate, and Mg-Al type hydrotalcite .

  According to the 2nd side surface of this invention, the molded article formed by shape | molding the chlorinated vinyl chloride-type resin composition which concerns on a 1st side surface is provided.

  According to the present invention, a chlorinated vinyl chloride resin composition and a molded article excellent in thermal stability are provided.

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  As described above for stabilizers for vinyl chloride resin compositions, stabilizers containing heavy metals other than zinc such as cadmium, tin, or lead are used as stabilizers for chlorinated vinyl chloride resin compositions. It is not preferable to do this because of its high toxicity and environmental impact.

  Therefore, the present inventors tried to use a zinc-based stabilizer having low toxicity as a stabilizer for the chlorinated vinyl chloride resin composition. As a result of intensive studies by the present inventors, it was found that effective stabilizers differ between vinyl chloride resin compositions and chlorinated vinyl chloride resin compositions.

  That is, when a stabilizer for improving the thermal stability of the vinyl chloride resin composition is added to the chlorinated vinyl chloride resin composition, the effect on the thermal stability is low or the thermal stability is lowered. I found out. Furthermore, it has been found that when a stabilizer having a low effect on the thermal stability of the vinyl chloride resin composition is added to the chlorinated vinyl chloride resin composition, the thermal stability is greatly improved.

Hereinafter, embodiments of the present invention will be described.
The chlorinated vinyl chloride resin composition according to one embodiment of the present invention includes a chlorinated vinyl chloride resin and a Zn—Al type hydrotalcite.

  This chlorinated vinyl chloride resin can be obtained by post-chlorination of a vinyl chloride resin. The method for chlorinating the vinyl chloride resin may be a photochlorination method or a thermal chlorination method.

  The chlorine content of the chlorinated vinyl chloride resin is 58% by mass or more, and preferably in the range of 60% by mass to 72% by mass. When the chlorine content is large, the heat resistance and mechanical strength of the chlorinated vinyl chloride resin composition tend to be high. When the chlorine content is low, the chlorinated vinyl chloride resin composition tends to be easily molded. The chlorine content can be measured by the method described in Japanese Industrial Standard JIS K 7229: 1995.

  The vinyl chloride resin used in this chlorinated vinyl chloride resin is a polymer of vinyl chloride monomer, a copolymer of a monomer having an unsaturated bond copolymerizable with vinyl chloride monomer and vinyl chloride monomer, or a mixture thereof. It is.

  Examples of the monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer include α-olefins, vinyl esters, acrylic acid esters, aromatic vinyls, vinyl halides, N-substituted maleimides or the like. Mention may be made of these mixtures.

  The α-olefins are, for example, ethylene, propylene, butylene, or a mixture thereof. Vinyl esters are, for example, vinyl acetate, vinyl propionate or mixtures thereof. Vinyl ethers are butyl vinyl ether, cetyl vinyl ether or mixtures thereof. Acrylic esters are, for example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl acrylate, phenyl methacrylate, or mixtures thereof. The aromatic vinyl is, for example, styrene, α-methylstyrene, or a mixture thereof. The vinyl halides are, for example, vinylidene chloride, vinylidene fluoride, or a mixture thereof. N-substituted maleimides are, for example, N-phenylmaleimide, N-cyclohexylmaleimide, or mixtures thereof.

  The average degree of polymerization of this vinyl chloride resin is preferably in the range of 600 to 1800. In addition, this average degree of polymerization can be measured by the method described in Japanese Industrial Standards JIS K 6720-2: 1999. As a method for polymerizing the vinyl chloride resin, a known polymerization method can be used. Known polymerization methods include, for example, water suspension polymerization, bulk polymerization, solution polymerization, or emulsion polymerization.

  The Zn-Al type hydrotalcite improves the thermal stability of a molded product made of a chlorinated vinyl chloride resin composition. The Zn—Al type hydrotalcite is in the form of particles. The average particle diameter of the Zn—Al type hydrotalcite is preferably in the range of 0.1 μm to 2 μm. The average particle diameter can be determined by a laser diffraction / scattering method.

The Zn—Al type hydrotalcite is a layered double hydroxide containing magnesium ions, zinc ions, and aluminum ions, and the composition thereof is typically represented by the following general formula (1).
_{(1): [Mg y Zn} z] 1-x Al x (OH) 2 (A n-) x / n · mH 2 O
In general formula (1), x is a numerical value within the range of 0.1 to 0.5.
In general formula (1), y is a numerical value within the range of 0.5 to 1, and is a value satisfying the following formula (2).
(2): y + x = 1
In the general formula (1), z is a numerical value in the range of 0 <z ≦ 0.5.
In the general formula (1), n is 1 or 2.
In the general formula (1), A ⁿ⁻ is an n-valent anion, that is, (CO ₃ ) ²⁻ or (ClO ₄ ) ^−.
In the general formula (1), m is a numerical value in the range of 0 to 1.

  The content of the Zn-Al type hydrotalcite with respect to 100 parts by mass of the chlorinated vinyl chloride resin is 0.01 parts by mass or more, preferably in the range of 0.01 parts by mass to 5 parts by mass, More preferably, it is in the range of 0.1 to 5 parts by mass, and still more preferably in the range of 0.5 to 5 parts by mass. When the content of the Zn—Al type hydrotalcite is small, the thermal stability of the molded product made of the chlorinated vinyl chloride resin composition tends to be low. When the content of Zn—Al type hydrotalcite is large, foaming tends to occur in a molded product made of a chlorinated vinyl chloride resin composition.

  This chlorinated vinyl chloride-based resin composition may contain a zinc-based stabilizer other than Zn—Al type hydrotalcite. Examples of the zinc-based stabilizer other than the Zn-Al type hydrotalcite include a carboxylic acid zinc salt, a zinc metal complex, zinc oxide, basic zinc carbonate, or a mixture thereof.

Here, examples of the carboxylic acid contained in the carboxylic acid zinc salt include montanic acid, rice bran fatty acid, behenic acid, erucic acid, stearic acid, oleic acid, linoleic acid, rice fatty acid, ricinoleic acid, myristic acid, palmitic acid. , Lauric acid, lower fatty acid, octylic acid, isostearic acid, dimer acid, naphthenic acid, acetic acid, benzoic acid, phthalic acid, terephthalic acid, azelaic acid, sebacic acid, adipic acid, succinic acid, malonic acid, maleic acid, crotonic acid , Malic acid, tartaric acid, citric acid, lactic acid, glycolic acid, thiodipropionic acid and the like, or a mixture thereof.
As the carboxylic acid zinc salt, zinc stearate is preferable.

  Examples of the compound that forms a complex with zinc include acetylacetone, triacetylmethane, 2,4,6-heptatrione, butanoylacetylmethane, lauroylacetylmethane, palmitoylacetylmethane, stearoylacetylmethane, phenylacetylacetylmethane, Dicyclohexylcarbonylmethane, benzoylformylmethane, benzoylacetylmethane, dibenzoylmethane, octylbenzoylmethane, stearoylbenzoylmethane, bis (4-octylbenzoyl) methane, benzoyldiacetylmethane, 4-methoxybenzoylbenzoylmethane, bis (4-carboxymethyl) Benzoyl) methane, 2-carboxymethylbenzoylacetyloctylmethane, dehydroacetic acid, cyclohexane-1,3-dione 3,6-dimethyl-2,4-dioxy cyclohexane -1-carboxylate, 2-acetyl cyclohexanone, dimedone, 2-benzoyl-cyclohexane and the like, or mixtures thereof.

  The content of the carboxylic acid zinc salt or the zinc metal complex with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 1.5 parts by mass or less, more preferably 1.0 part by mass or less, More preferably, it is in the range of 0.01 parts by weight to 1.0 parts by weight. When the content of the carboxylic acid zinc salt or the zinc metal complex is large, the molded article made of the chlorinated vinyl chloride resin composition has low thermal stability and tends to be decomposed.

  The content of zinc oxide with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 1.0 part by mass or less, and more preferably 0.5 parts by mass or less. When the content of zinc oxide is large, the molded article made of the chlorinated vinyl chloride resin composition has low thermal stability and tends to be easily decomposed.

  The content of basic zinc carbonate with respect to 100 parts by mass of chlorinated vinyl chloride resin is preferably 1.0 part by mass or less, and more preferably 0.5 parts by mass or less. When the content of basic zinc carbonate is large, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition is low and tends to be decomposed.

  This chlorinated vinyl chloride resin composition may contain a stabilizer other than the above-mentioned stabilizer. Examples of stabilizers other than the above-described stabilizers include inorganic compounds, carboxylic acid metal salts, metal complexes, organic phosphites, epoxy compounds, polyhydric alcohols, and mixtures thereof.

  Examples of inorganic compounds include calcium oxide, calcium hydroxide, zinc hydroxide, zinc carbonate, zinc sulfide, magnesium oxide, magnesium hydroxide, magnesium carbonate, aluminum oxide, aluminum hydroxide, sodium aluminate silicate, hydrocalumite, and silica. Aluminum silicate, magnesium silicate, calcium silicate, silicate metal salts such as zeolite, activated clay, talc, clay, bengara, asbestos, antimony trioxide, sericite, glass flakes, asbestos, wollastonite, potassium titanate, PMF, gypsum fiber, zonolite, MOS, phosphate fiber, glass fiber, carbon fiber, aramid fiber, sodium perchlorate, potassium perchlorate, lithium perchlorate, Mg-Al type hydrotalcite, etc., or a mixture thereof is there

Here, the Mg—Al type hydrotalcite is a layered double hydroxide containing magnesium ions and aluminum ions, and the composition thereof is typically represented by the following general formula (3).
General formula (3): [Mg _1-a Al _a (OH) ₂ ] (CO ₃ ) a / ₂ · nH ₂ O
In the general formula (3), a is a numerical value in the range of 0 <a ≦ 0.5.
In the general formula (3), n is a numerical value in the range of 0 to 15.

  The content of the inorganic compound with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably within the range of 0.01 parts by mass to 2 parts by mass.

  The carboxylic acid metal salt is, for example, a salt of an alkaline earth metal or alkali metal and a carboxylic acid.

  The alkaline earth metal is, for example, magnesium, calcium or a mixture thereof. The alkali metal is, for example, lithium, sodium, potassium or a mixture thereof.

  Examples of the carboxylic acid contained in the carboxylic acid metal salt include montanic acid, rice bran fatty acid, behenic acid, erucic acid, stearic acid, oleic acid, linoleic acid, rice fatty acid, ricinoleic acid, myristic acid, palmitic acid, lauric acid. , Lower fatty acids, octylic acid, isostearic acid, dimer acid, naphthenic acid, acetic acid, benzoic acid, phthalic acid, terephthalic acid, azelaic acid, sebacic acid, adipic acid, succinic acid, malonic acid, maleic acid, crotonic acid, malic acid , Tartaric acid, citric acid, lactic acid, glycolic acid, thiodipropionic acid and the like, or mixtures thereof.

  As the salt of alkaline earth metal and carboxylic acid, calcium stearate is preferred.

  The content of the carboxylic acid metal salt with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably within the range of 0.01 parts by mass to 2 parts by mass.

  Examples of compounds that form complexes with metals include acetylacetone, triacetylmethane, 2,4,6-heptatrione, butanoylacetylmethane, lauroylacetylmethane, palmitoylacetylmethane, stearoylacetylmethane, phenylacetylacetylmethane, and dicyclohexyl. Carbonylmethane, benzoylformylmethane, benzoylacetylmethane, dibenzoylmethane, octylbenzoylmethane, stearoylbenzoylmethane, bis (4-octylbenzoyl) methane, benzoyldiacetylmethane, 4-methoxybenzoylbenzoylmethane, bis (4-carboxymethylbenzoyl) ) Methane, 2-carboxymethylbenzoylacetyloctylmethane, dehydroacetic acid, cyclohexane-1,3-dione, 3 6-dimethyl-2,4-dioxy cyclohexane -1-carboxylate, 2-acetyl cyclohexanone, dimedone, mention may be made of 2-benzoyl-cyclohexane and the like, or a mixture thereof.

Examples of the metal contained in the metal complex include an alkali metal, an alkali metal earth, or a mixture thereof.
The alkaline earth metal is, for example, magnesium, calcium or a mixture thereof. The alkali metal is, for example, lithium, sodium, potassium or a mixture thereof.

  The content of the metal complex with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably within the range of 0.01 parts by mass to 2 parts by mass.

  Organic phosphites (phosphites) include, for example, triphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite , Tris (mono- or di-mixed nonylphenyl) phosphite, diphenyl acid phosphite, 2,2'-methylenebis (4,6-ditert-butylphenyl) octyl phosphite, diphenyldecyl phosphite, phenyl diisodecyl phosphite , Tributyl phosphite, tri (2-ethylhexyl) phosphite, tridecyl phosphite, trilauryl phosphite, dibutyl acid phosphite, dilauryl acid phosphite, trilauryl trithiophosphite, bis (neopentyl glyco) 1,4-cyclohexanedimethyldiphosphite, bis (2,4-ditert-butylphenyl) pentaerythritol diphosphite, bis (2,6-ditert-butyl-4-methylphenyl) pentaerythritol Diphosphite, distearyl pentaerythritol diphosphite, phenyl-4,4'-isopropylidene diphenol pentaerythritol diphosphite, tetra (C12-15 mixed alkyl) -4,4'-isopropylidene diphenyl diphosphite , Hydrogenated-4,4′-isopropylidene diphenol polyphosphite, bis (octylphenyl) · bis [4,4′-n-butylidenebis (2-tert-butyl-5-methylphenol)], 1,6 -Hexanediol diphosphite, tetratridecyl 4,4'-bu Tylidenebis (2-tert-butyl-5-methylphenol) diphosphite, hexa (tridecyl) 1,1,3-tris (2-methyl-5-tert-butyl-4-hydroxyphenyl) butane triphosphite, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, 2-butyl-2-ethylpropanediol, 2,4,6-tritert-butylphenol monophosphite, or a mixture thereof is there.

  The content of the organic phosphites relative to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably in the range of 0.01 parts by mass to 3 parts by mass. .

  Epoxy compounds include, for example, epoxidized soybean oil, epoxidized linseed oil, epoxidized tung oil, epoxidized fish oil, epoxidized beef tallow oil, epoxidized castor oil, epoxidized safflower oil, and epoxidized stearic acid. Methyl, epoxidized butyl stearate, epoxidized 2-ethylhexyl stearate, epoxidized stearic acid stearyl ester, epoxidized polybutadiene, tris (epoxypropyl) isocyanurate, epoxidized tall oil fatty acid ester, epoxidized linseed oil fatty acid ester, bisphenol Epoxy compounds such as A diglycidyl ether, vinylcyclohexene diepoxide, dicyclohexene diepoxide, 3,4-epoxycyclohexylmethyl, epoxycyclohexanecarboxylate, etc. Is a mixture thereof.

  The content of the epoxy compound with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably in the range of 0.01 parts by mass to 3 parts by mass.

  Polyhydric alcohols include, for example, trimethylolpropane, ditrimethylolpropane, pentaerythritol, dipentaerythritol, polypentaerythritol, pentaerythritol or stearate half ester of dipentaerythritol, bis (dipentaerythritol) adipate, diglycerin, tris (2-hydroxyethyl) isocyanurate or the like, or a mixture thereof.

  The content of the polyhydric alcohol with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 5 parts by mass or less, and more preferably in the range of 0.01 parts by mass to 3 parts by mass.

  This chlorinated vinyl chloride resin composition contains additives such as an antioxidant, a plasticizer, a lubricant, a filler, a colorant, and a flame retardant as necessary in addition to the stabilizer described above. Also good.

  Examples of the antioxidant include a phenol-based antioxidant, a sulfur-based antioxidant, a phosphorus-based antioxidant, an aromatic amine-based antioxidant, and the like, or a mixture thereof.

  The content of the antioxidant with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 3 parts by mass or less, and more preferably within the range of 0.01 parts by mass to 1 part by mass.

  The plasticizer is, for example, a phthalate plasticizer, an adipate plasticizer, a trimellitate plasticizer, a phosphate plasticizer, a polyester plasticizer, a chlorinated paraffin plasticizer, a pyromellitate plasticizer, an epoxy plasticizer, or the like. It is a mixture of these.

  The content of the plasticizer with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 100 parts by mass or less, and more preferably in the range of 0.1 parts by mass to 100 parts by mass.

  The lubricant is, for example, a fatty acid, an ester wax, a polyolefin wax, a paraffin wax, or a mixture thereof.

  The content of the lubricant with respect to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 15 parts by mass or less, and more preferably in the range of 0.01 parts by mass to 10 parts by mass.

  The filler is, for example, calcium carbonate, silica, glass beads, mica, or a mixture thereof.

  The content of the filler relative to 100 parts by mass of the chlorinated vinyl chloride resin is preferably 20 parts by mass or less, and more preferably in the range of 0.01 parts by mass to 15 parts by mass.

  This chlorinated vinyl chloride resin composition comprises, in addition to Zn-Al type hydrotalcite, a carboxylic acid zinc salt, a carboxylic acid alkali metal salt or a carboxylic acid alkaline earth metal salt, and a polyhydric alcohol. The group preferably includes one or more, more preferably includes two or more, and even more preferably includes all.

  As described above, this chlorinated vinyl chloride resin composition uses Zn—Al type hydrotalcite as a heat stabilizer. Therefore, this chlorinated vinyl chloride resin composition can achieve excellent thermal stability without containing a stabilizer containing heavy metals such as lead, cadmium, and tin.

  According to another aspect of the present invention, there is provided a molded article formed by molding the above-described chlorinated vinyl chloride resin composition. As described above, this chlorinated vinyl chloride resin composition does not contain heavy metals such as lead, cadmium, and tin, and is excellent in thermal stability. Therefore, a molded article made of this chlorinated vinyl chloride resin composition has low toxicity, little influence on the environment, excellent thermal stability, and good appearance. Therefore, this molded article can be suitably used in various applications such as building members, pipework equipment, and housing materials.

Examples of the present invention will be described below.
<Example 1>
First, 100 parts by mass of chlorinated vinyl chloride resin, 0.5 parts by mass of zinc stearate, 0.5 parts by mass of calcium stearate, 0.5 parts by mass of antioxidant, and 0.5 parts by mass Part of magnesium hydroxide, 0.5 part by weight of dipentaerythritol, and 0.5 part by weight of Zn—Al type hydrotalcite were mixed to obtain a resin composition. The chlorine content of this chlorinated vinyl chloride resin was 67% by mass.

  Next, this resin composition was put into a roll mill, and while being heated at a temperature of 200 ° C., the resin composition was sufficiently kneaded and molded into a sheet to obtain a molded product. The thickness of this molded product was 1 mm. Hereinafter, this molded product is referred to as a molded product A1.

<Example 2>
In the same manner as described in Example 1, except that the amount of zinc stearate added was changed from 0.5 parts by mass to 1.0 part by mass, and the Zn-Al type hydrotalcite was not added. A molded product was obtained. Hereinafter, this molded product is referred to as a molded product A2.

<Example 3>
A molded product was obtained in the same manner as described in Example 1 except that zinc oxide was added in place of the Zn-Al type hydrotalcite. Hereinafter, this molded product is referred to as a molded product A3.

<Example 4>
A molded product was obtained in the same manner as described in Example 1 except that basic zinc carbonate was added instead of Zn-Al type hydrotalcite. Hereinafter, this molded product is referred to as a molded product A4.

<Example 5>
A molded product was obtained in the same manner as described in Example 1 except that Zn-Al type hydrotalcite was not added. Hereinafter, this molded product is referred to as a molded product A5.

<Example 6>
A molded product was prepared in the same manner as described in Example 1 except that a vinyl chloride resin was used instead of the chlorinated vinyl chloride resin, and the kneading temperature in the roll mill was changed from 200 ° C to 170 ° C. Obtained. Hereinafter, this molded product is referred to as a molded product A6.

<Example 7>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, the addition of zinc stearate from 0.5 parts by weight to 1.0 part by weight, and Zn-Al type hydrotalcite A molded product was obtained in the same manner as described in Example 1, except that the kneading temperature in the roll mill was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A7.

<Example 8>
Use of vinyl chloride resin instead of chlorinated vinyl chloride resin, addition of zinc oxide instead of Zn-Al type hydrotalcite, and kneading temperature in roll mill changed from 200 ° C to 170 ° C. Except for this, a molded product was obtained in the same manner as described in Example 1. Hereinafter, this molded product is referred to as a molded product A8.

<Example 9>
Use of vinyl chloride resin instead of chlorinated vinyl chloride resin, addition of basic zinc carbonate instead of Zn-Al type hydrotalcite, kneading temperature in roll mill from 200 ° C to 170 ° C A molded product was obtained in the same manner as described in Example 1 except that the change was made. Hereinafter, this molded product is referred to as a molded product A9.

<Example 10>
Except for using a vinyl chloride resin in place of the chlorinated vinyl chloride resin, adding no Zn-Al type hydrotalcite, and changing the kneading temperature in the roll mill from 200 ° C to 170 ° C. A molded product was obtained in the same manner as described in Example 1. Hereinafter, this molded product is referred to as a molded product A10.

<Example 11>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 1.0 part by mass. Hereinafter, this molded product is referred to as a molded product A11.

<Example 12>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 2.0 parts by mass. Hereinafter, this molded product is referred to as a molded product A12.

<Example 13>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 3.0 parts by mass. Hereinafter, this molded product is referred to as a molded product A13.

<Example 14>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 5.0 parts by mass. Hereinafter, this molded product is referred to as a molded product A14.

<Example 15>
A molded product was obtained in the same manner as described in Example 1 except that Mg-Al type hydrotalcite was added instead of Zn-Al type hydrotalcite. Hereinafter, this molded product is referred to as a molded product A15.

<Example 16>
Molded product in the same manner as described in Example 1 except that 1.0 part by mass of Mg-Al type hydrotalcite was added instead of 0.5 part by mass of Zn-Al type hydrotalcite Got. Hereinafter, this molded product is referred to as a molded product A16.

<Example 17>
Molded product in the same manner as described in Example 1 except that 2.0 parts by mass of Mg-Al type hydrotalcite was added instead of 0.5 parts by mass of Zn-Al type hydrotalcite Got. Hereinafter, this molded product is referred to as a molded product A17.

<Example 18>
Molded product in the same manner as described in Example 1 except that 3.0 parts by mass of Mg-Al type hydrotalcite was added instead of 0.5 parts by mass of Zn-Al type hydrotalcite Got. Hereinafter, this molded product is referred to as a molded product A18.

<Example 19>
Molded product in the same manner as described in Example 1 except that 5.0 parts by mass of Mg-Al type hydrotalcite was added instead of 0.5 parts by mass of Zn-Al type hydrotalcite Got. Hereinafter, this molded product is referred to as a molded product A19.

<Example 20>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 1.0 part by mass, A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A20.

<Example 21>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 2.0 parts by mass. A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A21.

<Example 22>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 3.0 parts by mass, A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A22.

<Example 23>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 5.0 parts by mass, A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A23.

<Example 24>
Using vinyl chloride resin instead of chlorinated vinyl chloride resin, adding Mg-Al type hydrotalcite instead of Zn-Al type hydrotalcite, and kneading temperature in a roll mill from 200 ° C A molded product was obtained in the same manner as described in Example 1 except that the temperature was changed to 170 ° C. Hereinafter, this molded product is referred to as a molded product A24.

<Example 25>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin and 1.0 mass part of Mg-Al hydrotalcite instead of 0.5 mass part of Zn-Al hydrotalcite A molded product was obtained in the same manner as described in Example 1, except that the addition and the kneading temperature in the roll mill were changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A25.

<Example 26>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and 2.0 parts by mass of Mg-Al hydrotalcite instead of 0.5 parts by mass of Zn-Al hydrotalcite A molded product was obtained in the same manner as described in Example 1, except that the addition and the kneading temperature in the roll mill were changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A26.

<Example 27>
A vinyl chloride resin was used instead of the chlorinated vinyl chloride resin, and 3.0 parts by mass of Mg—Al type hydrotalcite was substituted for 0.5 parts by mass of the Zn—Al type hydrotalcite. A molded product was obtained in the same manner as described in Example 1, except that the addition and the kneading temperature in the roll mill were changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A27.

<Example 28>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin and 5.0 parts by mass of Mg-Al hydrotalcite instead of 0.5 parts by mass of Zn-Al hydrotalcite A molded product was obtained in the same manner as described in Example 1, except that the addition and the kneading temperature in the roll mill were changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A28.

<Example 29>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 0.01 parts by mass. Hereinafter, this molded product is referred to as a molded product A29.

<Example 30>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 0.05 parts by mass. Hereinafter, this molded product is referred to as a molded product A30.

<Example 31>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 0.1 parts by mass. Hereinafter, this molded product is referred to as a molded product A31.

<Example 32>
A molded product was obtained in the same manner as described in Example 1 except that the addition amount of the Zn-Al type hydrotalcite was changed from 0.5 parts by mass to 10.0 parts by mass. Hereinafter, this molded product is referred to as a molded product A32.

<Example 33>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 0.01 parts by mass. A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A33.

<Example 34>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 0.05 parts by mass, A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A34.

<Example 35>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 0.1 parts by mass, A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A35.

<Example 36>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin and the addition amount of Zn-Al type hydrotalcite changed from 0.5 parts by mass to 10.0 parts by mass. A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A36.

<Example 37>
In the same manner as described in Example 1, except that the amount of zinc stearate added was changed from 0.5 parts by weight to 1.5 parts by weight and no Zn-Al hydrotalcite was added. A molded product was obtained. Hereinafter, this molded product is referred to as a molded product A37.

<Example 38>
A molded product was obtained in the same manner as described in Example 1 except that 1.0 part by mass of zinc oxide was added instead of 0.5 part by mass of Zn-Al type hydrotalcite. Hereinafter, this molded product is referred to as a molded product A38.

<Example 39>
A molded product was obtained in the same manner as described in Example 1 except that 1.0 part by mass of basic zinc carbonate was added instead of 0.5 part by mass of Zn-Al type hydrotalcite. . Hereinafter, this molded product is referred to as a molded product A39.

<Example 40>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, the addition amount of zinc stearate changed from 0.5 parts by weight to 1.5 parts by weight, and Zn-Al type hydrotalcite A molded product was obtained in the same manner as described in Example 1 except that it was not added and the kneading temperature in the roll mill was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A40.

<Example 41>
The use of vinyl chloride resin instead of chlorinated vinyl chloride resin, and addition of 1.0 part by mass of zinc oxide instead of 0.5 part by mass of Zn-Al type hydrotalcite, roll mill A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature in was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A41.

<Example 42>
Using vinyl chloride resin instead of chlorinated vinyl chloride resin, and adding 1.0 part by mass of basic zinc carbonate instead of 0.5 part by mass of Zn-Al type hydrotalcite A molded product was obtained in the same manner as described in Example 1 except that the kneading temperature in the roll mill was changed from 200 ° C to 170 ° C. Hereinafter, this molded product is referred to as a molded product A42.

<Static thermal stability evaluation>
The molded products A1 to A42 were evaluated for static thermal stability. Specifically, first, a test piece having a fixed shape was cut out from each molded product. Subsequently, this test piece was continuously pressurized and heated at 10 MPa with a 200 ° C. press. Subsequently, the color difference between the test piece and the white plate was measured using a color difference meter. This measurement is performed 10 minutes, 30 minutes and 50 minutes after the start of the test for a molded article made of a chlorinated vinyl chloride resin composition, and 10 minutes for a molded article made of a vinyl chloride resin composition. After 30 minutes and 60 minutes, respectively.

When a part of the test piece was blackened, or when the whole test piece was blackened, the color difference was not measured.
The results are shown in Tables 1 to 7.

  In Tables 1 to 7, among the lines labeled “Static Thermal Stability Color Difference ΔE”, the line labeled “10 minutes” describes the color difference between the test piece and the white board 10 minutes after the start of the test. doing. The row labeled “30 minutes” describes the color difference between the test piece 30 minutes after the start of the test and the white board. The line labeled “50 minutes” describes the color difference between the test piece and the white board 50 minutes after the start of the test. The line labeled “60 minutes” describes the color difference between the test piece and the white plate 60 minutes after the start of the test.

  In Tables 1 to 7, among the test results of “static thermal stability color difference ΔE”, the description “partially decomposed” means that a part of the above-described test piece was blackened. doing. In addition, the description “decomposition” means that the entire test piece described above was in a blackened state.

  FIG. 1 is a graph showing an example of the relationship between test time and color difference. FIG. 1 is created using the data obtained in Examples 1 to 5. In the graph shown in FIG. 1, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A1 to A5.

  As apparent from FIG. 1 and Table 1, the color difference of the molded product A1 was smaller than that of the molded product A5 at all test times. The color difference of the molded product A2 was smaller than the color difference of the molded product A5 at the test times of 10 minutes and 30 minutes, but was almost the same as the color difference of the molded product A5 at the test time of 50 minutes. The color difference of the molded product A3 was smaller than the color difference of the molded product A5 at the test time of 10 minutes, but the molded product A3 was partially blackened at the test time of 30 minutes and blackened at the test time of 50 minutes. did. Further, the color difference of the molded product A4 was smaller than the color difference of the molded product A5 at the test time of 10 minutes, but the molded product A4 was blackened at the test time of 30 minutes.

  That is, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition containing 1.0 part by mass of zinc stearate with respect to 100 parts by mass of chlorinated vinyl chloride resin is 0.5 Compared with the thermal stability of the molded product made of a chlorinated vinyl chloride resin composition containing part by mass of zinc stearate, the initial deterioration progress rate was slow, but the latter deterioration progress rate was almost the same. It was. In addition, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition containing 0.5 parts by mass of zinc oxide or basic zinc carbonate with respect to 100 parts by mass of chlorinated vinyl chloride resin is The heat stability of the molded article made of a chlorinated vinyl chloride resin composition not containing zinc oxide or basic zinc carbonate was lower.

  On the other hand, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition containing 0.5 parts by mass of Zn-Al hydrotalcite with respect to 100 parts by mass of chlorinated vinyl chloride resin is It was higher than the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition not containing Zn-Al type hydrotalcite.

  FIG. 2 is a graph showing another example of the relationship between the test time and the color difference. FIG. 2 is created using the data obtained in Examples 6 to 10. In the graph shown in FIG. 2, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A6 to A10.

  As apparent from FIG. 2 and Table 1, the molded articles A6 to A10 were blackened at a test time of 60 minutes. Further, the color difference of the molded product A6 was almost the same as the color difference of the molded product A10 at the test times of 10 minutes and 30 minutes. Further, the color difference of the molded product A7 was smaller than the color difference of the molded product A10 at the test times of 10 minutes and 30 minutes. Further, the color difference of the molded product A8 was smaller than the color difference of the molded product A10 at the test times of 10 minutes and 30 minutes. Further, the color difference of the molded product A9 was smaller than the color difference of the molded product A10 at the test times of 10 minutes and 30 minutes.

  That is, the thermal stability of a molded article made of a vinyl chloride resin composition containing 1.0 part by mass of zinc stearate with respect to 100 parts by mass of vinyl chloride resin is 0.5 parts by mass of stearin. It was higher than the thermal stability of a molded article made of a vinyl chloride resin composition containing zinc acid. The thermal stability of a molded article made of a vinyl chloride resin composition containing 0.5 parts by mass of zinc oxide or basic zinc carbonate with respect to 100 parts by mass of vinyl chloride resin is zinc oxide or basic. It was higher than the thermal stability of a molded article made of a vinyl chloride resin composition containing no zinc carbonate.

  On the other hand, the thermal stability of a molded article made of a vinyl chloride resin composition containing 0.5 parts by mass of Zn-Al hydrotalcite with respect to 100 parts by mass of vinyl chloride resin is Zn-Al. It was almost the same as the thermal stability of a molded article made of a vinyl chloride resin composition containing no type hydrotalcite.

  FIG. 3 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 3 is created using the data obtained in Examples 1, 5, and 11 to 14. In the graph shown in FIG. 3, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A1, A5, and A11 to A14.

  As apparent from FIG. 3 and Table 2, the color differences of the molded products A1 and A11 to A14 were smaller than the color difference of the molded product A5 at all test times. Further, the color differences of the molded products A12 to A14 were smaller than the color differences of the molded products A1, A5, and A11 at all test times.

  That is, if the content of Zn—Al type hydrotalcite in the chlorinated vinyl chloride resin composition is large, the thermal stability of the molded product tends to be high.

  FIG. 4 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 4 is created using the data obtained in Example 5 and Examples 15 to 19. In the graph shown in FIG. 4, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A5 and A15 to A19.

  As apparent from FIG. 4 and Table 2, the color differences of the molded products A15 to A19 were smaller than the color difference of the molded product A5 at the test time of 10 minutes, but the molded products at the test time of 30 minutes and 50 minutes. It was almost the same as the color difference of A5.

  As apparent from the comparison between Table 2 and FIGS. 3 and 4, the thermal stability of the molded product made of the chlorinated vinyl chloride resin composition containing Zn—Al type hydrotalcite is It tends to be higher than the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition containing talcite.

  FIG. 5 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 5 is created using the data obtained in Examples 6, 10, and 20 to 23. In the graph shown in FIG. 5, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A6, A10, and A20 to A23.

  As is apparent from FIG. 5 and Table 3, the molded products A6, A10 and A20 to A23 were blackened at the test time of 60 minutes. Further, the color differences of the molded products A6 and A20 to A23 were larger than the color difference of the molded product A10 at the test time of 10 minutes. Further, the color differences of the molded products A6 and A20 to A23 were smaller than the color difference of the molded product A10 at a test time of 30 minutes.

  That is, when the content of Zn—Al type hydrotalcite in the vinyl chloride resin composition is large, the deterioration progress rate of the molded product is slow, but the initial deterioration progress rate tends to be fast.

  FIG. 6 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 6 is created using the data obtained in Example 10 and Examples 24 to 28. In the graph shown in FIG. 6, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A10 and A24 to A28.

  As apparent from FIG. 6 and Table 3, the color differences of the molded products A24 to A28 were larger than the color difference of the molded product A10 at the test time of 10 minutes. Further, the color differences of the molded products A24 to A28 were smaller than the color difference of the molded product A10 at the test time of 30 minutes. Further, the molded products A24 to A28 did not become black even at the test time of 60 minutes.

  That is, if the content of Mg—Al type hydrotalcite in the vinyl chloride resin composition is large, the deterioration progress rate of the molded product is slow, but the initial deterioration progress rate tends to be fast.

  As apparent from the comparison between Table 3 and FIGS. 5 and 6, the thermal stability of the molded article made of the vinyl chloride resin composition containing Zn—Al type hydrotalcite is the same as that of Mg—Al type hydrotalcite. It tends to be lower than the thermal stability of a molded product comprising the vinyl chloride resin composition contained.

  FIG. 7 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 7 is created using the data obtained in Example 1, Example 5, Example 11 to Example 14, and Example 29 to Example 32. In the graph shown in FIG. 7, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A1, A5, A11 to A14, and A29 to A32.

  As apparent from FIG. 7 and Table 4, the color differences of the molded products A1, A11 to A14 and A29 to A32 were smaller than the color differences of the molded product A5 at all test times. Further, the color differences of the molded products A1, A11 to A14, A31 and A32 were smaller than the color differences of the molded products A5, A29 and A30.

  Here, it was confirmed that the molded product A32 was foamed at a test time of 50 minutes. That is, when the content of Zn—Al type hydrotalcite with respect to 100 parts by mass of the chlorinated vinyl chloride resin is 0.01 parts by mass or more, the thermal stability of the molded product is high, and the content is 0. When the amount is 1 part by mass or more, the thermal stability of the molded product tends to be higher. Further, if the content of Zn—Al type hydrotalcite with respect to 100 parts by mass of chlorinated vinyl chloride resin is 10 parts by mass or more, foaming may be caused in the molded product.

  FIG. 8 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 8 is created using the data obtained in Example 6, Example 10, Example 20 to Example 23, and Example 33 to Example 36. In the graph shown in FIG. 8, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A6, A10, A20 to A23, and A33 to A36.

  As is apparent from FIG. 8 and Table 5, the molded products A6, A10, A20 to A23, and A33 to A36 were blackened at the test time of 60 minutes. Further, the color differences of the molded products A6, A20 to A23, and A33 to A36 were larger than the color difference of the molded product A10 at the test time of 10 minutes. Further, the color differences of the molded products A6, A20 to A23, and A33 to A36 were smaller than the color difference of the molded product A10 at the test time of 30 minutes.

  FIG. 9 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 9 is created using the data obtained in Example 5, Example 11, and Examples 37 to 39. In the graph shown in FIG. 9, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A5, A11, and A37 to A39.

  As apparent from FIG. 9 and Table 6, the color difference of the molded product A11 was smaller than that of the molded products A1 and A5 at all test times. The color difference of the molded product A37 was smaller than the color difference of the molded products A2 and A5 at the test time of 10 minutes, but the molded product A37 was partially blackened at the test time of 30 minutes and black at the test time of 50 minutes. Turned into. Further, the color difference of the molded product A38 was larger than the color difference of the molded product A3 at the test time of 10 minutes and smaller than the color difference of A5, but the molded product A38 was blackened at the test time of 30 minutes. Further, the color difference of the molded product A39 was larger than the color difference of the molded product A4 at the test time of 10 minutes, smaller than the color difference of the molded product A5, and blackened at the test time of 30 minutes.

  That is, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition containing 1.5 parts by mass of zinc stearate with respect to 100 parts by mass of chlorinated vinyl chloride resin is 1.0. Compared with the thermal stability of a molded article comprising a chlorinated vinyl chloride resin composition containing part by mass of zinc stearate, the initial deterioration rate was slow, but the late deterioration rate was fast. The thermal stability of the chlorinated vinyl chloride resin composition obtained by adding 1.0 part by mass of zinc oxide or basic zinc carbonate to 100 parts by mass of chlorinated vinyl chloride resin is 0.5 mass. It was lower than the thermal stability of a molded article comprising a chlorinated vinyl chloride resin composition to which part of zinc oxide or basic zinc carbonate was added.

  On the other hand, with respect to 100 parts by mass of chlorinated vinyl chloride resin, the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition to which 1.0 part by mass of Zn-Al type hydrotalcite is added, It was higher than the thermal stability of a molded article made of a chlorinated vinyl chloride resin composition to which 0.5 parts by mass of Zn-Al type hydrotalcite was added.

  FIG. 10 is a graph showing still another example of the relationship between the test time and the color difference. FIG. 10 is created using the data obtained in Example 10, Example 20, and Examples 40 to 42. In the graph shown in FIG. 10, the horizontal axis represents the test time, and the vertical axis represents the color difference obtained for the molded products A10, A20, and A40 to A42.

  As is apparent from FIG. 10 and Table 7, the molded products A10, A20 and A40 to A42 were blackened at a test time of 60 minutes. Further, the color difference of the molded product A20 was almost the same as the color difference of the molded products A6 and A10 at the test times of 10 minutes and 30 minutes. Further, the color difference of the molded product A40 was smaller than the color difference of the molded products A7 and A10 at the test times of 10 minutes and 30 minutes. Further, the color difference of the molded product A41 was smaller than the color difference of the molded products A8 and A10 at the test time of 10 minutes, almost the same as the color difference of the molded product A8 at the test time of 30 minutes, and smaller than the color difference of the molded product A10. . The color difference of the molded product A42 was smaller than the color differences of the molded products A9 and A10 at the test time of 10 minutes, almost the same as the molded product A9 at the test time of 30 minutes, and smaller than the color difference of the A10.

  That is, the thermal stability of a molded article made of a vinyl chloride resin composition containing 1.5 parts by mass of zinc stearate with respect to 100 parts by mass of vinyl chloride resin is 1.0 parts by mass of stearin. It was higher than the thermal stability of a molded article made of a vinyl chloride resin composition containing zinc acid. Further, the thermal stability of a molded article made of a vinyl chloride resin composition containing 1.0 part by mass of zinc oxide or basic zinc carbonate with respect to 100 parts by mass of vinyl chloride resin is 0.5. It was higher than the thermal stability of a molded article comprising a vinyl chloride resin composition containing part by mass of zinc oxide or basic zinc carbonate.

On the other hand, the thermal stability of a molded article made of a vinyl chloride resin composition containing 1.0 part by mass of Zn-Al type hydrotalcite with respect to 100 parts by mass of vinyl chloride resin is 0.5. This was almost the same as the thermal stability of a molded article made of a vinyl chloride resin composition containing part by mass of Zn—Al type hydrotalcite.
Hereinafter, the invention described in the scope of claims of the present application will be appended.
[1]
A chlorinated vinyl chloride resin composition comprising 100 parts by mass of a chlorinated vinyl chloride resin having a chlorine content of 58% by mass or more and a Zn-Al type hydrotalcite of 0.01 parts by mass or more.
[2]
Content of the said Zn-Al type hydrotalcite is a chlorinated vinyl chloride-type resin composition as described in [1] which exists in the range of 0.01 mass part thru | or 5 mass parts.
[3]
The chlorinated vinyl chloride resin composition according to [1] or [2], further comprising a carboxylic acid zinc salt, a carboxylic acid alkali metal salt or a carboxylic acid alkaline earth metal salt, and a polyhydric alcohol.
[4]
[1] A molded product obtained by molding the chlorinated vinyl chloride resin composition according to any one of [3].

Claims (3)

100 parts by mass of a chlorinated vinyl chloride resin having a chlorine content of 58% by mass or more, and 0.01% by mass or more of Zn-Al type hydrotalcite , carboxylic acid zinc salt, carboxylic acid alkali metal salt or carboxylic acid alkaline earth A metal stabilizer, a polyhydric alcohol, and a heat stabilizer composed of an inorganic compound,
The inorganic compound is at least one selected from the group consisting of calcium hydroxide, magnesium hydroxide, sodium perchlorate, potassium perchlorate, lithium perchlorate, and Mg-Al type hydrotalcite. Vinyl resin composition. The chlorinated vinyl chloride resin composition according to claim 1, wherein the inorganic compound is at least one of calcium hydroxide and magnesium hydroxide. A molded product formed by molding the chlorinated vinyl chloride resin composition according to claim 1 or 2 .