JP2512569B2 - Hard vinyl chloride resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a hard vinyl chloride resin composition having improved moldability.

(Prior Art) Hard vinyl chloride resins such as unplasticized polyvinyl chloride are
It has excellent mechanical strength, flame retardancy, weather resistance, chemical resistance, etc. and is widely used for pipes, plates, etc.

However, there are drawbacks. For example, there is a problem in moldability (flow characteristics during molding). Especially when using a post-chlorinated hard vinyl chloride resin to improve heat resistance,
Moldability becomes worse.

A number of methods have been proposed to improve the moldability of hard vinyl chloride resins, among which,
There is a method of adding a plasticizer and an internal lubricant to the vinyl chloride resin within the range of maintaining the hardness.

(Problems to be solved by the invention) However, when a plasticizer or an internal lubricant is added to a vinyl chloride resin, the moldability is improved as the added amount increases, but the heat resistance particularly decreases as the added amount increases. Is significantly
Sufficient improvement effect cannot be obtained.

The present invention is to solve the above problems, and an object of the invention is to improve the processability of the molding and to improve the impact resistance of the hard vinyl chloride resin without significantly lowering the heat resistance. To provide a composition.

(Means for Solving the Problems) The hard vinyl chloride resin composition of the present invention comprises 100 parts by weight of a vinyl chloride resin and at least one compound selected from the group of the following general formulas (a) and (b). 2 to 20 parts by weight, whereby the above object is achieved.

(A) (R ¹ -CONH) ₂ C ₆ H ₄ (wherein R ¹ is an alkyl group having 7 to 23 carbon atoms or an alkyl group in which any hydrogen thereof is substituted with a hydroxyl group.) (B) (R ^2- NHCO) ₂ C ₆ H ₄ (wherein R ² is an alkyl group having 7 to 23 carbon atoms or an alkyl group in which any hydrogen thereof is substituted with a hydroxyl group.) The vinyl chloride resin in the present invention is A homopolymer of vinyl chloride, a copolymer of vinyl chloride with another monomer, a graft polymer of vinyl chloride with another polymer, a chlorinated product of the above homopolymer, copolymer or graft polymer, and the like. And the like. Especially, the chlorine content (chlorination degree)
Chlorinated polyvinyl chloride of 62 to 70% by weight has excellent heat resistance and is therefore preferably used.

Further, the term "hard" in the present invention means that no plasticizer is added to the vinyl chloride resin, or the vinyl chloride resin contains 10
It means a mixture of plasticizer in an amount of not more than wt%.

The vinyl chloride resin has a lower degree of mechanical strength as its weight decreases, and its moldability (flow characteristics during molding) and transparency decrease as its weight increases. Therefore, the degree of polymerization is 300 to 2000, preferably 350 to It is suitable to use the one of about 1500.

The compound (a) used in the present invention is called a bisamide compound and includes, for example, capric acid, lauric acid,
It can be obtained by reacting higher fatty acids such as stearic acid, isostearic acid, 12-hydroxystearic acid and behenic acid with phenylenediamine.

Examples of such a compound (a) include o-phenylenebisstearic acid amide and m-phenylenebisstearic acid amide.

The compound (b) is called a dialkylphthalic acid amide compound, and includes, for example, an alkylamine such as caprylamine, laurylamine, stearylamine, 12-hydroxystearylamine, behenylamine, phthalic acid, isophthalic acid, or terephthalic acid. It can be obtained by reaction with an acid.

Examples of such compound (b) include N, N'-distearyl phthalic acid amide, N, N'-dilauryl isophthalic acid amide, N, N'-distearyl isophthalic acid amide, N, N'- Examples include dibehenyl isophthalic acid amide and N, N'-distearyl terephthalic acid amide.

In the compounds (a) and (b), when the carbon number of R ¹ and R ² is less than 7, the heat resistance becomes poor, and conversely, when the carbon number of R ¹ and R ² exceeds 23, the resin composition The time required for melting the resin becomes long, and the resin is easily decomposed by heat. The carbon number of R ¹ and R ² is 1
2 to 21 is preferable.

At least one compound selected from the above-mentioned compounds (a) and (b) will decrease the melt viscosity of the resin when the compounding amount is small, and the melting rate of the resin will be slow when the compounding amount is large. Therefore, at least one compound selected from the group of compounds (a) and (b) is 2 to 20 parts by weight, preferably 3 to 20 parts by weight, and more preferably 5 parts by weight based on 100 parts by weight of the vinyl chloride resin. ~ 15 parts by weight is compounded.

The composition of the hard vinyl chloride resin composition of the present invention is as described above, but in order to form a molded article from the compounding composition, a heat stabilizer, a lubricant, an impact resistance improver, an antistatic agent, a coloring Compounding agents generally used for hard vinyl chloride resins such as agents and fillers are compounded as necessary. And
For example, it is molded into a desired shape by an extrusion molding method or an injection molding method.

(Function) In the present invention, when 2 to 20 parts by weight of at least one compound selected from the group of the general formulas (a) and (b) is mixed with 100 parts by weight of the vinyl chloride resin, the resin is The flow characteristics at the time of molding are improved, and the impact resistance is also improved, without significantly lowering the heat resistance of.

Although the reason why such characteristics are obtained is not always clear, the above compound is melted by heating during molding to reduce the melt viscosity of the resin, thereby improving the flow characteristics during molding, and the above compound is In the obtained molded product, it exists in a solid state and in a phase-separated state, so that it is presumed that impact resistance is improved and heat resistance is not significantly affected.

(Example) Hereinafter, the Example and comparative example of this invention are shown.

Examples 1 to 5 100 parts by weight of a chlorinated polyvinyl chloride resin having an average degree of polymerization of 400 and a chlorine content of 63.5%, 1.5 parts by weight of RC-40FT and 1.5 parts by weight of JF-9B as heat stabilizers (both three Addition of 0.4 parts by weight of Exepearl BS and 0.4 parts by weight of Calcol 86 (both manufactured by Kao Corporation) as a lubricant, 0.1 part by weight of Roxyol G70S (manufactured by Henkel Hakusui Co., Ltd.),
A resin mixture was prepared by mixing at 80 ° C. or lower for 5 minutes with a Henschel mixer.

Compounds (a) and (b) shown in Table 1 were added to this resin mixture, as shown in Table 1, with respect to 100 parts by weight of the resin, 2 parts by weight, 5 parts by weight, 10 parts by weight, (15 parts by weight). Parts) and mixed well to obtain a chlorinated polyvinyl chloride resin compounding composition.

This compounded composition was kneaded with a roll at 190 ° C. for 3 minutes and then press-molded at 200 ° C. to prepare sheets having thicknesses of 3 mm and 5 mm. About this sheet, the heat resistance,
Molding processability and impact resistance were measured. The results are shown in Table 1.

(1) Heat resistance A sheet with a thickness of 5 mm was used to measure the heat distortion temperature (HDT) (conforming to JIS K-7207, load 18.5 kg / cm ² ) which is an index of heat resistance.

(2) Forming processability A sheet with a thickness of 3 mm is cut into 2 mm squares, and this is supplied to a Koka type flow tester, and a load of 1 mmΦ x 10 mm is used.
The flow value (discharge amount), which is an index of moldability, was measured under the conditions of 60 kg / cm ² and temperature of 190 ° C.

(3) Impact resistance Using a sheet having a thickness of 3 mm, the Charpy impact strength (with a notch), which is an index of impact resistance, was measured according to JIS K-7111.

Comparative Examples 1 to 7 Compounds (a) and (b) used in Examples were not added to the mixture prepared in Examples, or comparative compounds other than these compounds were used as shown in Table 2 above.
2 parts by weight, 5 parts by weight (8 parts by weight), 100 parts by weight, 1
The same procedure as in Example was carried out except that the addition amount was 0 part by weight. Table 2 shows the results.

(Effect of the invention) As described above, when 100 parts by weight of the vinyl chloride resin is mixed with 2 to 20 parts by weight of at least one compound selected from the group of the general formulas (a) and (b), heat resistance is improved. The molding processability can be improved and the impact resistance can also be improved without significantly reducing it.

Therefore, the hard vinyl chloride resin composition of the present invention is used for the housing of automation equipment, pipe fittings,
It is suitably used as an injection molded product such as a valve, an industrial plate, a pipe, a gutter, an extrusion molded product such as a window frame.

Claims (1)

(57) [Claims] 1. A hard vinyl chloride resin composition comprising 100 parts by weight of a vinyl chloride resin and 2 to 20 parts by weight of at least one compound selected from the group of the following general formulas (a) and (b). (A) (R ¹ -CONH) ₂ C ₆ H ₄ (wherein R ¹ is an alkyl group having 7 to 23 carbon atoms or an alkyl group in which any hydrogen thereof is substituted with a hydroxyl group.) (B) (R ^2- NHCO) ₂ C ₆ H ₄ (wherein R ² is an alkyl group having 7 to 23 carbon atoms or an alkyl group in which any hydrogen thereof is substituted with a hydroxyl group.)