JPH06145449A - Vinyl chloride-based resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition, good in fluidity and moldability in molding and capable of providing moldings excellent in heat resistance by blending a vinyl chloride-based resin with a specific compound in a specified proportion. CONSTITUTION:The objective composition is obtained by blending (A) 100 pts.wt. vinyl chloride-based resin with (B) 0.5-10 pts.wt., preferably 1-5 pts.wt. compound of the formula (R<1> is 1-10C linear or branched alkylene or phenylene; R<2> and R<3> are 2-22C linear or branched alkyl). Although, e.g. PVC or copolymers of vinyl chloride monomer and other copolymerizable monomers can be employed as the component (A), the PVC or copolymers having 400-900 polymerization degree are preferably used. For example, trimethylene-bis(4- stearoylaminobenzoate) and pentamethylene-bis(4-dodecanoylaminobenzoate) are cited as the component (B).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vinyl chloride resin composition which is excellent in fluidity and thermal stability during molding and which is excellent in heat resistance.

[0002]

2. Description of the Related Art Conventionally, vinyl chloride resins have been used in a wide range of fields such as molded products. The molded products obtained have good heat resistance, but their flowability is not so excellent. However, there is a problem that it is difficult to injection-mold a large-sized molded product or a molded product having a complicated shape.

The fluidity of the vinyl chloride resin is an important factor showing moldability, and as a method of improving the fluidity, for example, a method of lowering the degree of polymerization or adding a lubricant, a plasticizer or the like is performed. However, there is a problem that when the degree of polymerization is lowered, the impact resistance of the molded product is lowered, and addition of a lubricant, a plasticizer or the like reduces the heat resistance of the molded product.

In addition to the above, as a method for improving fluidity, JP-A-60-79052 discloses a method in which polyvinyl acetate is added to a vinyl chloride resin, but the effect of improving fluidity is not provided. There was a problem that I could not get that much.

Further, Japanese Patent Laid-Open No. 2-113048 discloses a method of adding thiodipropionate to a vinyl chloride resin. However, although the fluidity can be improved, the heat resistance of the molded product can be improved. There was a problem that it decreased.

Further, Japanese Patent Application Laid-Open No. 3-140346 discloses a method of adding a compound such as bisamide to a vinyl chloride resin, but the thermal stability at the time of molding is insufficient, and the molded product is not good. However, there is a problem that is likely to occur.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems and provides a molded article having excellent fluidity and moldability during molding and excellent heat resistance. An object is to provide a vinyl chloride resin composition.

[0008]

The vinyl chloride resin composition of the present invention comprises 100 parts by weight of a vinyl chloride resin and 0.5 to 10 parts by weight of a compound represented by the general formula (1). Characterize.

The present invention will be described in detail below. Examples of the vinyl chloride resin used in the present invention include polyvinyl chloride; copolymers of vinyl chloride monomers and monomers copolymerizable with vinyl chloride monomers; resins that can be grafted with vinyl chloride monomers and vinyl chloride monomers. Graft copolymers with and; chlorinated polyvinyl chloride obtained by post-chlorinating polyvinyl chloride, and the like, and one or more of these are used.

Examples of the monomer copolymerizable with the vinyl chloride monomer include olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; isobutyl vinyl ether;
Vinyl ethers such as phenyl ether; (meth) acrylic acid esters such as methyl acrylate, methyl methacrylate, ethyl methacrylate; vinylidene chloride,
Examples thereof include vinyl halides such as vinyl fluoride, and one or more of these are used.

Examples of the resin which can be graft-copolymerized with the vinyl chloride monomer include ethylene-vinyl acetate copolymer; ethylene-acrylic ester copolymer; chlorinated polyethylene; chlorosulfonated polyethylene; polyurethane and the like. .

The above-mentioned post-chlorinated polyvinyl chloride is obtained by post-chlorinating polyvinyl chloride. When the degree of chlorination increases, the fluidity decreases and the moldability deteriorates. Therefore, the degree of chlorination is 57 to 72. Wt% is preferable, and more preferably 57 to
It is 68% by weight.

The degree of polymerization of the vinyl chloride resin used in the present invention is not particularly limited, but when it is small, the elongation at break and impact resistance of the molded article are lowered, and when it is large, the fluidity is deteriorated and the injection molding is performed. Becomes difficult, so 300-1
400 is preferable, and more preferably 400 to 900.

The compound used in the present invention is represented by the general formula (1).

[0015]

[Chemical 2] In the general formula (1), R ¹ represents a linear or branched alkylene group having 1 to 10 carbon atoms or a phenylene group,
R ² and R ³ represent a linear or branched alkyl group having 2 to 24 carbon atoms.

When the number of carbon atoms of the alkylene group represented by R ¹ is large, the time required for melting and gelation of the vinyl chloride resin is long, thermal decomposition is likely to occur, and sufficient gelation is not carried out. As it may cause a poor appearance,
The carbon number is limited to 1 to 10, and preferably 1 to 6.

When the number of carbon atoms in the alkyl group represented by R ² and R ³ is large, the time required for melting and gelling the vinyl chloride resin is long and thermal decomposition is likely to occur, so that the number of carbon atoms is 2. To 24, preferably 2 to 2
It is 1.

Examples of the compound represented by the above general formula (1) include trimethylene-bis (4-stearoylaminobenzoate), pentamethylene-bis (4-dodecanoylaminobenzoate) and isopentyl-bis (4). -Stearoylaminobenzoate) and the like.

In the vinyl chloride resin composition of the present invention, if the amount of the above compound added is small, there is no effect of improving the fluidity, and if it is large, the slipperiness during molding becomes too strong and molding becomes difficult. The above compound is limited to 0.5 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the vinyl chloride resin.

In the vinyl chloride resin composition of the present invention, organic heat stabilizers; lubricants such as stearic acid esters and polyethylene waxes; polymethacrylic acid, to the extent that fluidity and heat resistance are not impaired, if necessary. Processing aids such as methyl;
Antioxidants; UV absorbers and the like may be added.

As a method for producing a molded product from the vinyl chloride resin composition of the present invention, any conventionally known method can be adopted, and examples thereof include an extrusion molding method and an injection molding method.

[0022]

EXAMPLES Examples of the present invention will be described below. (Examples 1 to 4 and Comparative Examples 1 to 7) Vinyl chloride resin-based compositions comprising the predetermined amounts of components shown in Tables 1 and 2 were mixed with a Henschel mixer at 60 ° C for 5 minutes, and then the compositions were mixed. The mixture was melt-kneaded with a roll at 180 ° C. for 3 minutes to obtain a kneaded product. The following evaluation was performed on the kneaded product, and the results are shown in Tables 1 and 2. (1) Discharge amount The above kneaded material is supplied to a Koka type flow tester and a load of 150 k is applied using a specific die (diameter 1 mm, length 10 mm).
The discharge rate per unit time was measured at gf / cm ² and a temperature of 180 ° C. (2) Vicat softening temperature After preheating the kneaded product at 180 ° C. for 3 minutes, the pressure of 150 is applied.
Press-molding was performed for 2 minutes at kgf / cm ² to prepare a test piece with a thickness of 3 mm, and JISK7206 was used as an index of heat resistance.
The Vicat softening temperature was measured based on (load 1.0 kgf).

[0023]

[Table 1]

[0024]

[Table 2]

The contents of various components in Tables 1 and 2 are as follows. -Polyvinyl chloride: Average degree of polymerization 540-Vinyl chloride copolymer: Graft copolymer of vinyl chloride onto ethylene-vinyl acetate copolymer (average degree of polymerization 500, vinyl chloride content 92.5% by weight, ethylene content 5. 6% by weight, vinyl acetate content 1.9% by weight) -Compound A: trimethylene-bis (4-stearoylaminobenzoate) -Compound B: pentamethylene-bis (4-dodecanoylaminobenzoate) -Compound C: Un Decamethylene-bis (4-dodecanoylaminobenzoate) -Compound D: Pentamethylene-bis (4-hexacontanoylaminobenzoate) -Dibutyltin malate: "RC-40" manufactured by Sankyo Machine Gosei Co., Ltd.
FT "-Dibutyltin mercapto:" JF-9 "manufactured by Sansha Machine Gosei Co., Ltd.
B "-Butyl stearate: Kao's" Exepearl BS "-Stearyl alcohol: Kao's" Calcol 86 "-Ester lubricant: Henkel Hakusui's" Roxyol G "
70S "

[0026]

As described above, the vinyl chloride resin composition of the present invention provides a molded article having excellent fluidity and moldability during molding and excellent heat resistance.

Claims (1)

[Claims] 1. A vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin and 0.5 to 10 parts by weight of a compound represented by the general formula (1). [Chemical 1] [In the formula, R ¹ represents a linear or branched alkylene group having 1 to 10 carbon atoms or a phenylene group, and R ² and R ³
Represents a linear or branched alkyl group having 2 to 24 carbon atoms. ]