JPH05239296A - Vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To obtain the subject composition which is excellent in fluidity during molding and gives moldings excellent in thermal resistance and transparency by incorporating a given amount of a specific compound in a vinyl chloride resin. CONSTITUTION:This composition comprises 100 pts.wt. of a vinyl chloride resin (e.g. PVC) and 0.5-10 pts.wt. of a compound represented by the formula.

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 at the time of molding, and which can provide a molded product having excellent heat resistance and transparency.

[0002]

2. Description of the Related Art Vinyl chloride resins are used for weather resistance, water resistance,
A molded product molded by an extrusion molding method, an injection molding method or the like is widely used for various purposes because it has excellent mechanical strength and is flame retardant. However, vinyl chloride resin is
Compared with other general-purpose thermoplastic resins such as polyolefin, the heat resistance of the molded product is good, but there is a problem that the flowability during molding is poor and the moldability is poor.

By the way, the simplest method for improving the fluidity of a vinyl chloride resin at the time of molding is to lower the degree of polymerization of the vinyl chloride resin. There is a problem that the impact strength of the molded product is reduced. Further, a plasticizer or a lubricant is added to the vinyl chloride resin to improve the fluidity, but in this case, there is a problem that the heat resistance is significantly lowered.

Therefore, a vinyl chloride resin composition has been proposed in which 0.1 to 20 parts by weight of polyvinyl acetate is added to 100 parts by weight of polyvinyl chloride (JP-A-60-7905).
No. 2). Further, a vinyl chloride resin composition obtained by adding thiodipropionate to polyvinyl chloride has been proposed (Japanese Patent Laid-Open No. 2-113048).

[0005]

By the way, the former vinyl chloride resin composition has improved thermal stability at the time of molding, but the fluidity is not improved so much, and therefore the moldability is not sufficient. There wasn't. Further, the latter vinyl chloride resin composition has good thermal stability during molding and improved fluidity, but thiodipropionate is an antistatic plasticizer, so the heat resistance of the molded article is significantly reduced. There was a problem to do.

In view of these points, the present invention provides a vinyl chloride resin composition capable of obtaining a molded product having good fluidity during molding, good moldability, and excellent heat resistance and transparency. The purpose is to

[0007]

The vinyl chloride resin composition of the present invention comprises a compound represented by the following formula (1) (hereinafter referred to as compound A) of 0.1 parts by weight per 100 parts by weight of the vinyl chloride resin. It is characterized by containing 5 to 10 parts by weight.

[Chemical 2]

As the vinyl chloride resin used in the present invention, a vinyl chloride homopolymer, a copolymer containing vinyl chloride as a main component and another monomer or two or more monomers copolymerizable therewith, Examples include chlorinated polyvinyl chloride, and mixtures of these polymers.

Examples of the monomer copolymerizable with vinyl chloride include α, such as ethylene, propylene and 1-butylene.
-Olefins, vinyl-based monomers such as vinyl acetate and vinyl stearate, styrene-based monomers such as styrene and α-methylstyrene, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylate such as methyl methacrylate. Examples thereof include system monomers, N-substituted maleimide monomers such as cyclohexylmaleimide and phenylmaleimide, ceryl vinyl ether, vinylidene chloride and the like.

Further, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer, ethylene-ethyl acrylate-carbon monoxide copolymer. It may be a graft copolymer obtained by graft-polymerizing vinyl chloride onto a polymer or polyurethane. For example, in a copolymer of vinyl chloride and ethylene, when the ethylene content exceeds 15% by weight, the heat resistance of the obtained molded article decreases, so the ethylene content is 15% by weight or less, more preferably 9 to 4%. It is preferably in% by weight. In a copolymer of vinyl chloride and vinyl acetate, when the vinyl acetate content exceeds 5% by weight, the heat resistance of the obtained molded article decreases, so the vinyl acetate content is 5% by weight or less, more preferably 1 to It is preferably 4% by weight. In the case of post-chlorinated polyvinyl chloride, when the degree of chlorination is more than 72% by weight, the fluidity is remarkably reduced.
Below, it is more preferably 57 to 68% by weight.

The average degree of polymerization of the vinyl chloride resin is not particularly limited, but if it is less than 300, a molded product having sufficient strength cannot be obtained, and if it exceeds 1400, the molding performance is poor.
Generally, a vinyl chloride resin having an average degree of polymerization of 300 to 1400 is used.

As the compound (A) represented by the above formula (1), for example, the one commercially available as Fireguard 3100 (trade name, manufactured by Teikoku Kasei) is used. Regarding the amount of the compound (A) added to the vinyl chloride resin, if it is added in excess of 10 parts by weight with respect to 100 parts by weight of the vinyl chloride resin, the slipperiness during molding becomes too strong and molding becomes difficult. Since the improvement of the fluidity is not sufficient with the addition amount of less than 1 part by weight, as described above, the vinyl chloride resin 10
It is 0.5 to 10 parts by weight with respect to 0 parts by weight.

The vinyl chloride resin composition of the present invention comprises
If necessary, heat stabilizers such as organic compounds that have been conventionally used, antioxidants, UV inhibitors, lubricants such as stearates and polyethylene wax, and acrylonitrile, as long as heat resistance and fluidity are not significantly impaired. -Butadiene-styrene copolymer (ABS) and methylmethacrylate-butadiene-styrene copolymer (MB
A modifier such as S) and a filler such as glass fiber or calcium carbonate are added together.

As a method for molding a molded body from the vinyl chloride resin composition of the present invention, a conventional method can be adopted. For example, an extrusion molding method, an injection molding method, and the like.

[0015]

EXAMPLES The present invention will be further described with reference to examples. Hereinafter, parts by weight will be referred to as parts.

Examples 1 to 4 The composition as shown in Table 1 was mixed with a Henschel mixer (trade name) at 60 ° C. for about 15 minutes. Then, the mixture was kneaded with two rolls having a diameter of 8 inches at 180 ° C. for 3 minutes to obtain a mixture. This mixture was subjected to fluidity evaluation as described below, and after preheating at 180 ° C. for 3 minutes, pressure 15
The sheet was press molded at 0 kg / cm ² for 2 minutes to obtain a sheet having a thickness of 3 mm. The following substances were used in Table 1. Polyvinyl chloride: average degree of polymerization 540 V-E-Vc copolymer: vinyl chloride-ethylene-vinyl acetate copolymer, average degree of polymerization 500, vinyl chloride content 9
2.5% by weight, ethylene content 5.6% by weight Compound (A): Fireguard 3100 (trade name, manufactured by Teijin Chemicals Ltd.) Dibutyltin malate: RC4OFT (manufactured by Sankyo Machine Synthesis Co., Ltd.) Dibutyltin mercapto: JF- 9B (manufactured by Sansha Machinery Synthesizer) Butyl stearate: Exepearl BS (manufactured by Kao) Stearyl alcohol: Calcol 86 (manufactured by Kao) Ester lubricant: Roxyol G70S (manufactured by Henkel Hakusui)

For the evaluation of the fluidity of each vinyl chloride resin composition, the above mixture was supplied to a Koka type flow tester, a die having a diameter of 1 mm and a length of 10 mm was used, and a load of 15 was applied.
The discharge rate (cc / sec) per unit time at 0 kg / cm ² and a temperature of 180 ° C. was measured. Regarding the heat resistance evaluation, JIS K72 was used as a test piece.
The Vicat softening temperature (° C) was measured according to 06 (load 1.0 kgf). Regarding the transparency evaluation, a direct reading haze computer HGM-2DP (manufactured by Suga Test Instruments Co., Ltd.) was used to measure the total light transmittance (%) and H of the above-mentioned sheet.
AZE (%) was measured. The results are shown in Table 1.

Comparative Examples 1 to 6 Compounds (A) were not used as shown in Table 1 in the following composition, or as shown in Table 1, except that 15 parts were added to 100 parts of vinyl chloride resin. Same as Examples 1 to 4. The results are shown in Table 1.
In addition, when 15 parts of the compound (A) was used, the slipperiness was too strong, roll forming was difficult, and a sheet could not be obtained.

[0019]

[Table 1] As is clear from the above results, the vinyl chloride resin composition of the present invention has improved fluidity without impairing heat resistance and transparency. In contrast,
When the compound (A) was not added, the fluidity was poor, and when they were added in a large amount of 20%, the slipperiness was too strong and roll molding could not be performed.

[0020]

Industrial Applicability As described above, the vinyl chloride resin composition of the present invention has excellent fluidity during heat melting and good moldability, and a molded product having excellent heat resistance and transparency is obtained. You can

Claims (1)

[Claims] 1. A vinyl chloride resin composition comprising 0.5 to 10 parts by weight of a compound represented by the following formula (1) per 100 parts by weight of a vinyl chloride resin. [Chemical 1]