JP2020023611A - Chlorine-containing resin composition and molded product thereof - Google Patents

Abstract

To provide a chlorine-containing resin composition that does not require any adjustment of processability, is excellent in heat resistance and is suppressed in the occurrence of plate-out.SOLUTION: The chlorine-containing resin composition includes a chlorine-containing resin, a lead-based stabilizer and an organic solvent solution of an alkali metal salt of perchloric acid.SELECTED DRAWING: None

Description

The present invention relates to a chlorine-containing resin composition and a molded article thereof.

Chlorine-containing resins represented by polyvinyl chloride have high flexibility and are easy to process, and have excellent physical properties such as mechanical strength. Therefore, they are widely used in various applications besides pipe materials (also simply called pipe materials). It is used. However, on the other hand, chlorine-containing resins have a problem in heat resistance (also called thermal stability), and are unstable to heat during processing and use and decomposed by heating, so from the viewpoint of improving heat resistance and processability, Usually, a stabilizer is used together with the chlorine-containing resin.

A typical example of the stabilizer for the chlorine-containing resin is a lead-based stabilizer. Further, a stabilizer for a chlorine-containing polymer in which a lead-based stabilizer and a perchloric acid-based compound are combined and a resin composition containing such a stabilizer are also disclosed (see Patent Documents 1 to 7).

JP 2006-28340 A JP-A-2004-059603 JP 05-339451 A JP-A-62-079249 WO 03/010091 JP 2012-140638 A JP 02-182741 A

Among chlorine-containing resins used for various applications, lead-based stabilizers containing lead stearate as a main component are often used in chlorine-containing resins for pipes. In recent years, the level of heat resistance required for a chlorine-containing resin composition has been increased, and accordingly, the amount of a lead-based stabilizer added has been increasing. However, as the amount of lead stearate used increases, the occurrence of plate-out during the production of a molded article from the chlorine-containing resin composition increases, and there is a problem that the appearance and physical properties of the molded article are reduced. Further, since it is necessary to clean the mold in order to remove the plate-out, there are problems in terms of production efficiency and work.
Another method to increase heat resistance is to replace some of the lead-based stabilizers with tin-based compounds, hydrotalcite, or polyhydric alcohol compounds, or to add them without replacement. The change or increase or decrease of the process has a large effect on processability.Since it is necessary to adjust the processability by increasing or decreasing additives such as lubricants each time, it is necessary to minimize the effect on molded products, so complicated operations are required. There is a problem of becoming.

The present invention has been made in view of the above circumstances, and has as its object to provide a chlorine-containing resin composition that does not require adjustment of workability, has excellent heat resistance, and suppresses occurrence of plate-out.

The present inventor has studied a chlorine-containing resin composition which is excellent in heat resistance without adjusting the processability, and in which the occurrence of plate-out is suppressed, the lead-containing stabilizer and alkali of perchloric acid are added to the chlorine-containing resin. It has been found that when a metal salt and an organic solvent solution are added, the heat resistance of the chlorine-containing resin composition can be significantly improved. As a result, it is possible to improve the heat resistance after reducing the amount of use of the lead-based stabilizer or within the range where the effect of the workability is not affected, and it is not necessary to adjust the workability. It has been found that the occurrence of plate-out can be suppressed by reducing the amount of the system stabilizer used, and the present invention has been completed.

That is, the present invention is a chlorine-containing resin composition comprising a chlorine-containing resin, a lead-based stabilizer, and an organic solvent solution of an alkali metal salt of perchloric acid.

The above-mentioned chlorine-containing resin composition contains 0.01 to 0.5 parts by mass of an organic solvent solution of an alkali metal salt of perchloric acid in terms of an alkali metal salt of perchloric acid with respect to 100 parts by mass of the chlorine-containing resin. Is preferred.

The alkali metal salt of perchloric acid is preferably sodium perchlorate.

The present invention is also a molded article characterized by using the chlorine-containing resin composition of the present invention.

The chlorine-containing resin composition of the present invention has excellent heat resistance while using a lead-based stabilizer, and is also one in which plate-out of the lead-based stabilizer at the time of processing a molded article is suppressed, and adjustment of workability is necessary. Since there is no such material, it can be suitably used as a raw material for a tube material.

Hereinafter, preferred embodiments of the present invention will be specifically described. However, the present invention is not limited to the following description, and can be appropriately modified and applied without departing from the gist of the present invention.

1. Chlorine-Containing Resin Composition The chlorine-containing resin composition of the present invention comprises a chlorine-containing resin, a lead-based stabilizer, and an organic solvent solution of an alkali metal salt of perchloric acid. The chlorine-containing resin composition of the present invention may contain one or more of a chlorine-containing resin, a lead-based stabilizer, and an organic solvent solution of an alkali metal salt of perchloric acid, respectively. Further, one or more other components other than these may be contained.

Although the content of the organic solvent solution of the alkali metal salt of perchloric acid in the chlorine-containing resin composition of the present invention is not particularly limited, the organic solvent solution of the alkali metal salt of perchloric acid is based on 100 parts by mass of the chlorine-containing resin. Is preferably 0.01 to 0.5 parts by mass in terms of an alkali metal salt of perchloric acid. By containing in such a ratio, even with the use of a small amount of a lead-based stabilizer, it is possible to make the chlorine-containing resin composition excellent in heat resistance, and when an existing stabilizer is used, it is stable. It becomes possible to eliminate or minimize the adjustment of workability due to the change of the agent. The content of the organic solvent solution of the alkali metal salt of perchloric acid is more preferably 0.01 to 0.4 parts by mass in terms of the alkali metal salt of perchloric acid, based on 100 parts by mass of the chlorine-containing resin. And more preferably 0.02 to 0.35 parts by mass.

The content of the lead-based stabilizer in the chlorine-containing resin composition of the present invention is preferably 0.5 to 3 parts by mass based on 100 parts by mass of the chlorine-containing resin. With the content of the lead-based stabilizer being such a ratio, the chlorine-containing resin composition has excellent heat resistance, and the occurrence of plate-out when molding and processing the chlorine-containing resin composition is more sufficient. Can be suppressed. The content of the lead-based stabilizer is more preferably from 0.7 to 2.0 parts by mass, and still more preferably from 0.9 to 1.5 parts by mass, based on 100 parts by mass of the chlorine-containing resin. .

1) Chlorine-Containing Resin The chlorine-containing resin contained in the chlorine-containing resin composition of the present invention is not particularly limited as long as it is a resin (polymer) containing a chlorine atom, but a vinyl chloride resin is preferable. Thereby, a molded article excellent in flexibility and flame retardancy can be obtained.

Examples of the vinyl chloride resin include homopolymers such as polyvinyl chloride, chlorinated polyvinyl chloride, polyvinylidene chloride, and chlorinated polyethylene; vinyl chloride-vinyl acetate copolymer, and vinyl chloride-ethylene-vinyl acetate copolymer. Copolymer, vinyl chloride-ethylene copolymer, vinyl chloride-propylene copolymer, vinyl chloride-styrene copolymer, vinyl chloride-isobutylene copolymer, vinyl chloride-vinylidene chloride copolymer, vinyl chloride-urethane copolymer , Vinyl chloride-acrylate copolymer, vinyl chloride-styrene-maleic anhydride copolymer, vinyl chloride-styrene-acrylonitrile copolymer, vinyl chloride-butadiene copolymer, vinyl chloride-isoprene copolymer, chloride Vinyl-chlorinated propylene copolymer, vinyl chloride-vinylidene chloride-vinyl acetate Polymers, vinyl chloride - maleic acid ester copolymer, vinyl chloride - methacrylic acid ester copolymers, vinyl chloride - acrylonitrile copolymer, vinyl chloride - copolymers such as maleimide copolymer; and the like.
It should be noted that a blend of a chlorine-containing resin and a chlorine-free resin may be used, and a polymerization method for obtaining a vinyl chloride resin is not particularly limited.

2) Lead-based stabilizer The lead-based stabilizer contained in the chlorine-containing resin composition of the present invention is not particularly limited as long as it is appropriately set according to the use of the molded article. For example, lead white, basic lead sulfite, Examples include dibasic lead sulfite, tribasic lead sulfate, dibasic lead phosphite, silica gel coprecipitated lead silicate, lead stearate, lead benzoate, dibasic lead stearate, lead naphthenate and the like. Among them, tribasic lead sulfate, dibasic lead sulfite and dibasic lead stearate are preferred.

3) Alkali metal salt of perchloric acid The alkali metal salt of perchloric acid may be any alkali metal salt such as lithium, sodium, potassium, rubidium and the like. Although it can be used, the sodium salt is preferred. That is, the alkali metal salt of perchloric acid is preferably sodium perchlorate. By using sodium perchlorate, the chlorine-containing resin composition can more sufficiently exhibit the above-described effects.

The alkali metal salt of perchloric acid is preferably contained in the organic solvent in an amount of 0.1% by mass to 60% by mass. If the amount is less than 0.1% by mass, the amount of the organic solvent is too large, and the softening temperature of the molded article of the chlorine-containing resin composition may be lowered. It becomes difficult to dissolve, and the alkali metal salt may not be sufficiently dispersed in the chlorine-containing resin. The content of the alkali metal salt of perchloric acid is more preferably 1% by mass to 50% by mass in the organic solvent, and even more preferably 10% by mass to 30% by mass in the organic solvent.

Examples of the organic solvent used for preparing the organic solvent solution of the alkali metal salt of perchloric acid include iPG (ethylene glycol monoisopropyl ether), BG (ethylene glycol monobutyl ether), and iBDG (diethylene glycol monoisobutyl ether). Ethylene glycol ethers; propylene glycol ethers such as MFDG (dipropylene glycol monomethyl ether), PFG (propylene glycol monopropyl ether) and PFDG (dipropylene glycol monopropyl ether); DMTG (triethylene glycol dimethyl ether), MEDG (diethylene glycol) Methyl ethyl ether), DEDG (diethylene glycol diethyl ether), DMFDG (dipropylene glycol dimethyl ether) Dialkyl based ether ether) and the like; and, BC (butyl carbitol), BCA (butyl carbitol acetate) and the like.

4) Other Components The chlorine-containing resin composition of the present invention may contain other components as necessary. For example, various additives such as metal soap, processing aid, reinforcing agent, lubricant, antioxidant, colorant, heat-resistant auxiliary and the like can be mentioned.

The amount of the other components is preferably 15 parts by weight or less with respect to 100 parts by weight of the whole chlorine-containing resin composition. More preferably, it is 10 parts by weight or less, and still more preferably 5 parts by weight or less.

Although various additives are not particularly limited, examples of the metal soap include fatty acid metal salts such as calcium stearate, barium stearate, and zinc stearate. These can provide thermal stability.

Examples of the processing aid include an acrylic processing aid such as a (meth) acrylate polymer. Examples of the acrylate include methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, and the like. Examples of the methacrylate include methyl methacrylate and methacrylic acid. Examples include ethyl, n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, and cyclohexyl methacrylate. The acrylic processing aid may be a single polymer or a copolymer of two or more of the above-described acrylic acid and / or ester thereof, and methacrylic acid and / or ester thereof. The weight average molecular weight of the polymer is preferably 200,000 to 7,000,000.
Commercially available acrylic processing aids include, for example, Mitsubishi Rayon's Metabrene P type, Kaneka's Kaneace PA series, and Rohm and Haas' Paraloid K series.

Examples of the reinforcing agent include butadiene-based reinforcing agents such as MBS (methyl methacrylate-butadiene styrene copolymer), chlorinated polyethylene, and the like.

Examples of the lubricant include liquid paraffin, industrial white mineral oil, synthetic paraffin, petroleum wax, petrolatum; odorless light hydrocarbon, silicone organopolysiloxane, fatty acid, aliphatic alcohol, higher fatty acid, animal or vegetable oil and fat. Fatty acids and those obtained by hydrogenating those fatty acids and having 8 to 22 carbon atoms; straight-chain hydroxy fatty acids such as hydroxystearic acid; reducing animal or vegetable fats or oils or their fatty acid esters or decomposing and distilling natural wax C4 or more obtained; tridecyl alcohol, polyethylene glycol having a molecular weight of 200 to 9,500; polypropylene glycol having a molecular weight of 1,000 or more; polyoxypropylene-polyoxyethylene-block polymer having a molecular weight of 1,900 to 9000 ; Olay Palmitoamide, stearyl erucic acid amide, 2 stearoamidoethyl stearate, ethylenebisfatty acid amide, N, N'-oleoylstearylethylenediamine, N, N'-bis (2hydroxyethyl) alkyl (C12-C18) amide, N , N'bis (hydroxyethyl) lauroamide, oleic acid fatty acid diethanolamine reacted with N-alkyl (C16-C18) trimethylenediamine, distearic acid ester of di (hydroxyethyl) diethylenetriamine monoacetate, n-butyl hydrogen stearate rosin Methyl ester, di-n-butyl sebacate, di-isobutyl sebacate, di-ethylhexyl sebacate, di-n-octyl sebacate, glycerin fatty acid ester, glycerin lactostearyl, Taerythritol stearic acid monoester, pentaerythritol stearic diester, pentaerythritol stearic acid triester, pentaerythritol stearic acid tetraester, sorbitan fatty acid ester, polyethylene glycol monostearate, polyethylene glycol dilaurate, polyethylene glycol monooleate, polyethylene glycol diester Oleate, polyethylene glycol palm fatty acid ester, polyethylene glycol tall oil fatty acid ester, ethanediol montanic acid ester, 1,3 butanediol montanic acid ester, diethylene glycol stearic acid ester, propylene glycol fatty acid ester, triglyceride, linseed oil, palm oil, 12 -Hydroxystearic acid Glycerin ester, hydrogenated fish oil, beef tallow, sperm acetyl wax, montan wax, carnauba wax, beeswax, wood wax, hardened whale oil Lauryl stearate, stearyl stearate, etc., aliphatic saturated acid esters of monohydric aliphatic alcohols, lanolin, stearic acid Alkali metal and alkaline earth metal salts of higher fatty acids such as zinc and calcium stearate, low molecular weight polyethylene, low molecular weight polypropylene, polyethylene oxide, fluorine resin, polytetrafluoroethylene, tetrafluoroethylene / 6-fluoropropylene copolymer Coalescence, polychloroethylene trifluoride, polyvinyl fluoride, other propylene glycol alginate, dialkyl ketone, and acrylic copolymer (for example, Allex Modaflow).

Examples of the antioxidant include a phenol-based antioxidant, a sulfur-based antioxidant, and a phosphite-based antioxidant.
Examples of phenolic antioxidants include 2,6-di-tert-butyl-p-cresol, 2,6-diphenyl-4-octadecyloxyphenol, and stearyl (3,5-di-tert-butyl-4-hydroxy). Phenyl) -propionate, distearyl (3,5-di-tert-butyl-4-hydroxybenzyl) phosphonate, thiodiethylene glycol bis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,6- Hexamethylene bis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 1,6-hexamethylene bis [(3,5-di-tert-butyl-4-hydroxyphenyl) propionamide], 4,4′-thiobis (6-tert-butyl-m-cresol), 2,2′-methylenebis (4-methyl-6-tert-butyl) Phenol), 2,2-methylenebis (4-ethyl-6-tert-butylphenol), bis [3,3-bis (4-hydroxy-3-tert-butylphenyl) butyric acid] glycol ester, 4,4 '-Butylidenebis (6-tert-butyl-m-cresol), 2,2'-ethylidenebis (4,6-di-tert-butylphenol), 2,2'-ethylidenebis (4- sec-butyl-6-tert-butyl) Tributylphenol), 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, bis [2-tert-butyl-4-methyl-6- (2-hydroxy-3- Tert-butyl-5-methylbenzyl) phenyl] terephthalate, 1,3,5-tris (2,6-dimethyl-3-hydroxy-4-tert-butylbenzyl) isocyanurate, 1,3 5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -2,4,6- Trimethylbenzene, 1,3,5-tris [(3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxyethyl] isocyanurate, tetrakis [methylene-3- (3,5-di-tert-butyl-4) -Hydroxyphenyl) propionate] methane, 2-tert-butyl-4-methyl-6- (2-acryloyloxy-3-tert-butyl-5-methylbenzyl) phenol, 3,9-bis [1,1-dimethyl -2-{(3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy}] ethyl-2,4,8,10-tetraoxaspiro [5,5] unde Emissions, triethylene glycol bis [(3-tert-butyl-4-hydroxy-5-methylphenyl) propionate] and the like.

Examples of the sulfur-based antioxidant include dialkylthiodipropionates such as dilauryl, dimyristyl and distearyl of thiodipropionic acid, and β- of polyol such as pentaerythritol tetra (β-dodecylmercaptopropionate). Alkyl mercaptopropionates can be mentioned.

Examples of the phosphite-based antioxidant include trisnonylphenyl phosphite, tris (2,4-ditert-butylphenyl) phosphite, tris [2-tert-butyl-4- (3-tert-butyl-4). -Hydroxy-5-methylphenylthio) -5-methylphenyl] phosphite, tridecyl phosphite, octyl diphenyl phosphite, di (decyl) monophenyl phosphite, monodecyl diphenyl phosphite, mono (dinonyl phenyl) bis (Nonylphenyl) phosphite, di (tridecyl) pentaerythritol diphosphite, distearylpentaerythritol diphosphite, di (nonylphenyl) pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol Diphosphite, (2,6-ditert-butyl-4-methylphenyl) pentaerythritol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphite, tetra (tridecyl) isopropylidene diphenol diphosphite, tetra (C12- 15 mixed alkyl) -4,4'-n-butylidenebis (2-tert-butyl-5-methylphenol) diphosphite, hexa (tridecyl) -1,1,3-tris (2-methyl-4-hydroxy-5- Tert-butylphenyl) butanetriphosphite, tetrakis (2,4-di-tert-butylphenyl) biphenylenediphosphonite, 2,2′-methylenebis (4,6-di-tert-butylphenyl) (octyl) phosphite No.

Examples of the coloring agent include TiO ₂ , zirconium oxide, BaSO ₄ , zinc oxide (zinc white) lithopone (a mixture of zinc sulfide and barium sulfate), carbon black, a mixture of carbon black and titanium dioxide, iron oxide, and Sb _2. Inorganic pigments such as O ₃ , Cr ₂ O ₃ , cobalt blue, cobalt green, etc., inorganic pigments such as ultramarine blue, and organic pigments such as azo pigments, phthalocyanine pigments, quinacridone pigments, perylene pigments, diketopyrrolopyrrole pigments and anthraquinone pigments Is mentioned. Further, a composite pigment obtained by compounding the above pigment may also be used.

Examples of the heat-resistant auxiliary include hydrotalcite, zeolite, partial esters of dipentaerythritol and adipic acid, polyols, and tris (2-hydroxyethyl) isocyanurate.

The application of the chlorine-containing resin composition of the present invention is not particularly limited, and can be used for various applications using a chlorine-containing resin as a raw material. In order to be characterized by being excellent, a lead-based stabilizer is used, and is used for a pipe material requiring heat resistance, that is, the chlorine-containing resin composition of the present invention is a chlorine-containing resin composition for a pipe material. Being an object is one of the preferred embodiments of the present invention.

2. Molded article The present invention is also a molded article using the above-described chlorine-containing resin composition of the present invention, that is, a molded article formed from the chlorine-containing resin composition of the present invention. Such a molded article is useful for various uses because of its excellent heat resistance.

The molding method (molding method) for obtaining the molded body is not particularly limited, and examples thereof include extrusion molding, injection molding, roll molding, dip molding, and blow molding. As described above, the resin composition of the present invention is particularly excellent in heat resistance, and thus is particularly useful for high-temperature molding. In particular, it can be preferably used when molding at a molding temperature of 200 ° C. or higher.

More preferably, the molded article is a pipe or a joint. In particular, the joint is usually formed at a high temperature because it usually has a complicated shape. In addition, an injection molding machine is used as a processing and molding machine.Injection molding is a method in which a molten chlorine-containing resin composition is injected at once from a nozzle into a mold at high pressure and molded. Due to friction with the nozzle or friction between the resin compositions, the temperature of the resin composition rises by several tens of degrees from the processing temperature. Therefore, a very high level of heat resistance is required, but the resin composition of the present invention can sufficiently meet such a requirement. Thus, the form in which the molded body is a joint is one of the preferred forms of the present invention, and is also suitable for the form in which the molded body is a large joint.
Here, a large joint refers to a joint for connecting a pipe having a diameter of 30 mm or more. Large joints are quite heavy and buried deep in the soil, requiring much greater strength than small joints, especially impact strength. Therefore, the strength is usually improved by adding a toughening agent. However, in order to increase the melt viscosity of the resin composition, it is necessary to further increase the temperature at the time of working and molding, and the heat resistance is further required. You.

Specific examples will be described below in order to explain the present invention in detail, but the present invention is not limited only to these examples. Unless otherwise specified, “%” and “wt%” mean “% by weight (% by mass)”.

Examples 1-4, Comparative Example 1
100 parts by weight of a vinyl chloride resin (TK-1000 manufactured by Shin-Etsu Chemical Co., Ltd.) were blended with each additive as shown in Table 1, and the obtained chlorine-containing resin composition was heated to a roll surface temperature of 170 ° C. The mixture was kneaded with an adjusted 8-inch roll machine (manufactured by KANSAI ROLL) for 5 minutes to prepare a roll sheet having a thickness of 0.3 mm. The following tests were performed using this roll sheet. Table 1 shows the results. In addition, among the additives in Table 1, the amount of Na perchlorate contained in the Na perchlorate solution was described for the sodium perchlorate solution CX-1.

Press Hue Seven roll sheets prepared as described above were stacked and held at 100 kg / cm ^{2 for} 10 minutes so as to have a thickness of 2 mm using a press machine (TOYOSEIKI MINI TEST PRESS-10) having a press surface temperature of 180 ° C. The hue of the sheet after pressing was measured with a color difference meter (manufactured by Nippon Denshoku Industries Co., Ltd., simultaneous photometric spectroscopic color difference meter SQ-2000), and ΔE was determined based on the hue of the composition of Comparative Example 1.
When ΔE is 1 or more, a problem occurs in the appearance of a molded product.

Press Heat Resistance Seven sheet rolls prepared as described above are stacked and held at 100 kg / cm ^{2 for} 30 minutes so as to have a thickness of 2 mm using a press machine (TOYOSEIKI MINI TEST PRESS-10) having a press surface temperature of 180 ° C. . The hue of the pressed sheet was measured by the above color difference meter, and ΔE was determined based on the hue of the pressed sheet (temperature: 180 ° C., holding time: 10 minutes) prepared in Comparative Example 1.
When ΔE is 13 or less, the color tone is good and the possibility of causing a problem is low, and when ΔE is 13 or more, it is considered that a trouble such as a failure of a molding machine may occur.

Oven heat resistance The sheet prepared above was placed in a 180 ° C. gear oven manufactured by ESPEC and held for 40 minutes. The hue was measured with the above-mentioned color difference meter using the sheets before and after holding, and ΔE was determined based on the pressed hue of the composition of Comparative Example 1.
If ΔE is 13 or less at the time of holding for 40 minutes, the color tone is good and the possibility of a problem is low. If ΔE is 13 or more, trouble such as failure of a molding machine may occur. You.

The components other than the vinyl chloride resin described in Table 1 are as follows.
Calcium carbonate SCP-E # 110: Lead stearate SL-1000 manufactured by Sankyo Flour Milling Co., Ltd. Ester-based WAX Requistar SG22 manufactured by Sakai Chemical Industry Co., Ltd. Pigment gray D-13833 manufactured by RIKEN VITAMIN CO., LTD. Sodium butyl carbitol (sodium perchlorate content 15% by mass) solution CX-1: manufactured by Kyodo Yakuhin Co., Ltd.

Examples 5 to 8, Comparative Example 2
Each additive was weighed to 3 kg of a vinyl chloride resin (TK-1000 manufactured by Shin-Etsu Chemical Co., Ltd.) so that the ratio shown in Table 2 was obtained. Using a 20 L Henschel mixer (manufactured by Nippon Coke Industry), the weighed material was mixed until the temperature of the mixture reached 100 ° C. by rotating the blades of the Henschel mixer at 2000 rpm, and was discharged from the Henschel mixer when the temperature reached 100 ° C. Thus, a chlorine-containing resin composition was prepared.
Using the obtained chlorine-containing resin composition, a plate-out test was performed by the following method. Table 2 shows the results. In addition, each component described in Table 2 was the same as that in Table 1, and for the sodium perchlorate solution CX-1, the amount of sodium perchlorate contained in the sodium perchlorate solution was described.

Plate-out test During and after the completion of pipe molding by the following molding method, the state of plate-out occurrence on the mold and sizing (that is, the state of occurrence of deposits on the mold and sizing) is visually checked. Evaluation was made according to the following criteria.
A: No deposits on the mold and sizing were observed.
〇: Not observed during molding, but a small amount of deposits were observed on the mold and sizing at the end of molding.
Δ: Deposits were confirmed on the mold and sizing during molding, but no abnormality was found on the molded pipe.
×: Deposits were found on the entire surface of the mold and the sizing during molding, and deposits peeled off from the mold or the sizing were adhered to the molded pipe.
[Molding method]
Laboratory extruder (conical 2D20C type, manufactured by Toyo Seiki Co., Ltd.) having suction sizing (a device for smoothing the surface properties of a molded product) having a cooling function, extrusion conditions: C1 175 ° C, C2 180 ° C, C3 185 ° C, AD185 C., D1 180.degree. C., D2 205.degree. C., mold: for pipe) using a chlorine-containing resin composition to mold a pipe over 5 hours.

From the results in Tables 1 and 2, the compositions of Examples 1 to 4 in which sodium perchlorate was used together with lead stearate with respect to the vinyl chloride resin, the press hue and press heat resistance even when the amount of lead stearate was small. The composition of Comparative Example 1 in which sodium perchlorate was not used was excellent in both heat resistance and oven heat resistance, and the occurrence of plate out was suppressed. Inferior to any of them, and also resulted in many plate-outs.
From these, by using a lead-based stabilizer and an alkali metal salt of perchloric acid in combination, the amount of the lead-based stabilizer used is small, there is no need to adjust workability, and it is excellent in heat resistance and plate-out. It was confirmed that a chlorine-containing resin composition in which the generation of chlorination was suppressed was obtained.

Claims (4)

A chlorine-containing resin composition comprising a chlorine-containing resin, a lead-based stabilizer, and an organic solvent solution of an alkali metal salt of perchloric acid. The organic solvent solution of an alkali metal salt of perchloric acid is contained in an amount of 0.01 to 0.5 parts by mass in terms of an alkali metal salt of perchloric acid with respect to 100 parts by mass of the chlorine-containing resin. The chlorine-containing resin composition according to the above. The chlorine-containing resin composition according to claim 1, wherein the alkali metal salt of perchloric acid is sodium perchlorate. A molded article characterized by using the chlorine-containing resin composition according to claim 1.