JPH05140404A - Chlorinated vinyl chloride resin composition - Google Patents

Abstract

(57) [Summary] [Structure] A thiodipropionate such as distearyl thiodipropionate or dibehenyl thiodipropionate is contained in an amount of 1 to 100 parts by weight of a chlorinated vinyl chloride resin.
A chlorinated vinyl chloride resin composition containing 20 parts by weight. [Effect] Since this chlorinated vinyl chloride resin composition has good fluidity during heating and melting, good moldability, and excellent heat resistance, a product having good heat resistance can be easily molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chlorinated vinyl chloride resin composition having good fluidity when melted and excellent in moldability.

[0002]

2. Description of the Related Art Chlorinated vinyl chloride resin is generally produced by chlorinating vinyl chloride resin, and has the advantages of vinyl chloride resin such as flame resistance, water resistance, chemical resistance and weather resistance. It has excellent properties and a heat distortion temperature of 20-4.
It has the advantage of being improved by 0 ° C.

Therefore, although it is expected to be applied to applications in which heat resistance is required, it has excellent heat resistance, but on the other hand, it has the drawback of poor flowability during heating and melting and poor moldability. In order to improve the moldability, various proposals have been made such as adding a fluidity improver such as a plasticizer or a lubricant.

For example, Japanese Patent Application Laid-Open No. 2-113048 proposes to add a plasticizer represented by the following formula (2) to a chloride-containing vinyl resin.

[0005]

[Chemical 2]

(Where, t and m are integers of 1 or 2, R ¹ ,
R ² represents a linear or branched alkyl group having 4 to 13 carbon atoms. )

[0007]

However, since the plasticizer comprising the compound of the above formula (2) has a low melting point and the molecular chain length is not so long, even if the fluidity at the time of heating and melting is improved, There is a problem that the heat resistance is significantly lowered.

In view of the above points, an object of the present invention is to provide a chlorinated vinyl chloride resin composition having a small decrease in heat resistance and a good fluidity during heating and melting.

[0009]

The chlorinated vinyl chloride resin composition of the present invention comprises 100 parts by weight of a resin whose thiodipropionate represented by the following formula (1) is mainly a chlorinated vinyl chloride resin. 1 to 20 parts by weight is contained.

[0010]

[Chemical 3]

(In the formula, R ¹ and R ² represent a linear or branched alkyl group having 14 to 28 carbon atoms.) The chlorinated vinyl chloride resin used in the present invention is a vinyl chloride resin. It is a chlorinated resin and is not limited to one obtained by post-chlorinating a vinyl chloride homopolymer, but may be one obtained by post-chlorinating a copolymer of vinyl chloride and another monomer. Its chlorine content is 60 to 72% by weight, preferably 62 to 69% by weight. This is because if the chlorine content is less than 60% by weight or exceeds 72% by weight, it becomes difficult to mix with the above-mentioned thiodipropionate, and molding defects such as bleeding out occur.

The degree of polymerization of the chlorinated vinyl chloride resin is not particularly limited, but the average degree of polymerization is 300 to 1500.
Those in the range of are preferably used. Average degree of polymerization is 300
If it is less than 1, the mechanical properties such as elongation at break of the obtained molded article will be deteriorated, and if it exceeds 1500, the fluidity at the time of melting will be deteriorated and it will be difficult to mix with the thiodipropionate.

As the resin component in the composition, not only the chlorinated vinyl chloride resin alone but also the vinyl chloride resin may be blended. In this case, the chlorine content of the resin mixture is preferably 60 to 72% by weight. This is because when the chlorine content in the resin mixture is less than 60% by weight, the heat resistance is not sufficiently improved.

The thiodipropionate used in the present invention is represented by the above formula (1), wherein:
R ^1, the number of carbon atoms in the straight-chain or branched alkyl group represented by R ² is a 14-28 has a carbon number of R ^1, R ² is 1
If it is 3 or less, the mechanical strength of the obtained molded article decreases,
In addition, the heat resistance is significantly reduced, and when the carbon number of R ¹ and R ² is 29 or more, the thiodipropionate becomes too slippery with respect to the chlorinated vinyl chloride resin. This is because mixing becomes difficult.

The thiodipropionate is generally ^one in which R ¹ and R ² are the same alkyl group, and examples thereof include dimyristyl thiodipropionate (alkyl group having 14 carbon atoms), Palmityl thiodipropionate (alkyl group having 16 carbon atoms), distearyl thiodipropionate (alkyl group having 18 carbon atoms),
Examples thereof include dibehenyl thiodipropionate (alkyl group having 22 carbon atoms) and dicerotyl thiodipropionate (alkyl group having 26 carbon atoms). Particularly, dipalmityl thiodipropionate and distearyl thiodipropionate And dibehenyl thiodipropionate are preferably used.

This thiodipropionate is, as described above, 100 parts by weight of a resin mainly containing a chlorinated vinyl chloride resin (when the resin content is only a chlorinated vinyl chloride resin, the chlorinated vinyl chloride resin is 1 to 100 parts by weight)
The amount is ˜20 parts by weight, more preferably 3 to 10 parts by weight. This is because if it is less than 1 part by weight, the fluidity at the time of melting is hardly improved, and if it exceeds 20 parts by weight, it becomes difficult to mix with the resin.

The chlorinated vinyl chloride resin composition of the present invention can be used in an amount not adversely affecting the physical properties of the resin composition.
Conventionally used heat stabilizers, lubricants, processing aids, antioxidants, modifiers, fillers, UV absorbers, colorants and the like are added together.

For example, as the heat stabilizer, organotin stabilizers such as octyl tin malate, dimethyl tin mercapto and dibutyl tin malate, lead bases such as dibasic lead stearate, tribasic lead sulfate and lead stearate. Examples include stabilizers, composite stabilizers such as barium-zinc and calcium-zinc, and inorganic stabilizers. Examples of lubricants include stearyl alcohol, polyethylene wax, calcium stearate, butyl stearate, and ester lubricants.

Examples of the modifier include impact modifiers such as chlorinated polyethylene, ethylene-vinyl acetate copolymer, acrylonitrile-butadiene-styrene rubber and methylmethacrylate-butadiene-styrene rubber. Examples of the inhibitor include bisphenol A, butyl hydroxytoluene, etc., examples of the filler include glass fiber, calcium carbonate, talc, etc., and examples of the ultraviolet absorber include salicylate ester, benzoate ester, benzophenone ultraviolet absorber. ,
Examples thereof include benzotriazole-based ultraviolet absorbers.

For molding the chlorinated vinyl chloride resin composition of the present invention, conventionally known molding methods such as injection molding, extrusion molding, calender molding and roll press molding are appropriately adopted.

[0021]

Embodiments of the present invention will be described below. Less than,
Parts means parts by weight. Examples 1 to 6 and Comparative Examples 1 to 4, as shown in Table 1, two kinds of chlorinated vinyl chloride resins (chlorine content 64% by weight, average degree of polymerization 50)
0. chlorinated vinyl chloride-based resin; chlorinated vinyl chloride-based resin A, chlorine content 68 weight%, average polymerization degree 1000 chlorinated vinyl chloride-based resin; chlorinated vinyl chloride-based resin B) and chlorine content 56. A vinyl chloride resin having 8% by weight and an average degree of polymerization of 500 was used.

Further, as thiodipropionate, Table 1
As shown in FIG. 4, distearyl thiodipropionate (R has 18 carbon atoms), dibehenyl thiodipropionate (alkyl group has 22 carbon atoms), dilauryl thiodipropionate (alkyl group has 12 carbon atoms; Comparative Example )It was used.

As other compounds, additives such as heat stabilizers and lubricants as shown in Table 1 were used. The above resin,
Thiodipropionate and other additives were added in the proportions shown in Table 1, and the respective resin compositions were supplied to a Henschel mixer and mixed at about 80 ° C. for 5 minutes. Then, the mixture was melt-kneaded with a roll at 190 ° C. for 3 minutes.

In order to check the fluidity of the resin composition at the time of melting,
Each of the obtained kneaded products was supplied to a Koka type flow tester, and a die having a diameter of 1 mm and a length of 10 mm was used to apply a load of 1
The discharge rate (× 10 ^-2 cc / sec) per unit time at 60 kgf / cm ² and a temperature of 180 ° C. was measured.

Further, in order to check the heat resistance of the molded product made of the resin composition, the obtained kneaded product was heated at 190 ° C. and 150 kg /
A test piece was prepared by press molding at cm ² . This test piece complies with JIS-K-7207 (load 18.5).
kgf / cm ²⁾ and heat deflection temperature measured (℃) was carried out.

The results of discharge amount measurement and deflection temperature under load are shown in Table 1.

[0027]

[Table 1]

As is apparent from the above results, the chlorinated vinyl chloride resin composition of the present invention has good fluidity when heated and melted and also has excellent heat resistance.

[0029]

As described above, the chlorinated vinyl chloride resin composition of the present invention has good fluidity during heating and melting and excellent heat resistance. It can be molded.

Claims (1)

[Claims] 1. A resin 10 in which a thiodipropionate represented by the following formula (1) is mainly a chlorinated vinyl chloride resin.
A chlorinated vinyl chloride resin composition, which is contained in an amount of 1 to 20 parts by weight based on 0 parts by weight. [Chemical 1] (In the formula, R ¹ and R ² represent a linear or branched alkyl group having 14 to 28 carbon atoms.)