KR102563549B1 - Pvc composition, as well as electric wire and cable using the same - Google Patents

Abstract

(assignment)
The present invention provides a vinyl chloride resin composition having good weather resistance and bleed resistance even when terephthalic acid ester is used as a plasticizer, and electric wires and cables using the same.
(solution)
The electric wire 10 is a vinyl chloride resin containing terephthalic acid ester as a plasticizer on the outer periphery of the conductor 1 and containing 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass or more of silicone rubber with respect to 100 parts by mass of the vinyl chloride resin. An insulating layer 2 made of a composition is provided.

Description

Vinyl chloride resin composition, and wire and cable using the same {PVC COMPOSITION, AS WELL AS ELECTRIC WIRE AND CABLE USING THE SAME}

The present invention relates to a polyvinyl chloride resin composition and electric wires and cables using the same.

Polyvinyl chloride resin (PVC) is a low-cost, flame retardant material, and is used as a wire covering material by adding a plasticizer for imparting flexibility.

As a plasticizer, di-2-ethylhexyl phthalate (DOP), which is inexpensive and has high compatibility with PVC, is mainly used (see, for example, Patent Document 1), but in recent years, along with the REACH regulation, it is a substance prohibited by the RoHS directive There is a possibility that it will be designated as , so its use is discouraged.

As an alternative candidate for DOP, there is diisononyl phthalate (DINP), which has a track record of use as a wire covering material next to DOP (see, for example, Patent Document 2), but DINP is also used for rubber purposes, which may cause a supply shortage. Because of this, practical use of other plasticizers is required.

As other plasticizers, there is a plasticizer having a terephthalic acid ester structure having compatibility with PVC equivalent to that of DOP and DINP (for example, see Patent Documents 3 to 4).

Japanese Unexamined Patent Publication No. 2015-89934 Japanese Unexamined Patent Publication No. 2014-159507 Japanese Unexamined Patent Publication No. 2003-226788 Japanese Patent Publication No. 2009-504851

However, since the terephthalic acid ester represented by the following general formula (1) has inferior weather resistance compared to the phthalic acid ester represented by the following general formula (2), there is a problem in using it outdoors for wire applications (each formula R in represents an alkyl chain).

(Formula 1)

(Formula 2)

In addition, among additives, there is a problem that it is difficult to be compatible with PVC or terephthalic acid ester and bleeds to the surface of the composition to generate stickiness.

Accordingly, an object of the present invention is to provide a vinyl chloride resin composition having good weather resistance and bleed resistance even when terephthalic acid ester is used as a plasticizer, and electric wires and cables using the same.

According to the present invention for achieving the above object, the following polyvinyl chloride resin composition and electric wires and cables using the same are provided.

[1] A vinyl chloride resin composition containing a terephthalic acid ester as a plasticizer, which contains 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass or more of a silicone rubber based on 100 parts by mass of the vinyl chloride resin.

[2] The vinyl chloride resin composition according to the above [1], containing 10 to 100 parts by mass of the terephthalic acid ester with respect to 100 parts by mass of the vinyl chloride resin.

[3] The vinyl chloride resin composition according to [1] or [2] above, containing 0.1 to 5 parts by mass of the silicone rubber based on 100 parts by mass of the vinyl chloride resin.

[4] The vinyl chloride resin composition according to any one of [1] to [3], wherein the terephthalic acid ester is a terephthalic acid ester having 8 to 10 carbon atoms in each alkyl chain.

[5] A polyvinyl chloride resin composition containing terephthalic acid ester as a plasticizer, based on 100 parts by mass of the vinyl chloride resin, 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass or more of a silicone rubber Composed of a vinyl chloride resin composition containing Electrical wire with an insulating layer.

[6] A polyvinyl chloride resin composition containing terephthalic acid ester as a plasticizer, based on 100 parts by mass of the vinyl chloride resin, 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass or more of a silicone rubber Composed of a vinyl chloride resin composition containing Cable with sheath.

[7] The cable described in [6] above, provided with the wire described in [5] above.

According to the present invention, a vinyl chloride resin composition having good weather resistance and bleed resistance even when terephthalic acid ester is used as a plasticizer, and electric wires and cables using the same are provided.

1 is a cross-sectional view schematically showing an example of an electric wire according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view schematically showing an example of a cable according to an embodiment of the present invention.

[Vinyl chloride resin composition]

A vinyl chloride resin composition according to an embodiment of the present invention is a vinyl chloride resin composition containing a terephthalic acid ester as a plasticizer, and 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass of a silicone rubber with respect to 100 parts by mass of the vinyl chloride resin contain more than

The present inventors considered that the reason why terephthalic acid esters have poor weatherability is that terephthalic acid esters have an open carboxyl group structure, so that contact with water penetrating from the outside is easy and hydrolysis is high.

Therefore, as a result of examining the addition of various additives in order to suppress the deterioration of weather resistance when using terephthalic acid ester, it was found that weather resistance can be improved by adding silicone rubber having excellent water repellency.

On the other hand, liquid silicone oil has improved weather resistance, but has a problem that it is difficult to be compatible with PVC or terephthalic acid ester and bleeds to the surface of the composition to cause stickiness.

Therefore, as a result of examining in consideration of weather resistance as well as bleed resistance, it was found that a solid silicone rubber can make these compatible, and the polyvinyl chloride resin composition of the present invention was developed.

(terephthalic acid ester)

As the terephthalic acid ester used as a plasticizer in the vinyl chloride resin composition according to the embodiment of the present invention, terephthalic acid esters having 8 to 10 (C8 to C10) carbon atoms in each alkyl chain are suitable. If it is less than C8, it is difficult to obtain required heat resistance. This is because as the number of carbon atoms in the alkyl chain decreases, that is, as the molecular weight decreases, volatilization of the plasticizer by heating is promoted, and the vinyl chloride resin composition is cured. On the other hand, if it is C11 or more, it is difficult to obtain alcohol necessary for ester synthesis of the plasticizer and the cost increases, so practicality is poor, and C10 or less is preferable.

The alkyl chain of the terephthalic acid ester may have either a straight chain structure or a branched chain structure, but it is preferably a branched chain structure. Specifically, although di-2-ethylhexyl terephthalate (DOTP) as C8, diisononyl terephthalate (DINTP) as C9, and diisodecyl terephthalate (DIDTP) as C10, it is limited to these. it is not going to be

In the embodiment of the present invention, the addition amount of the terephthalic acid ester is 100 parts by mass or less with respect to 100 parts by mass of the vinyl chloride resin. It is preferable to add 10 parts by mass or more. Although the addition of silicone rubber exerts an effect on the addition of terephthalic acid ester, if the added amount of terephthalic acid ester exceeds 100 parts by mass, the plasticizer itself bleeds and stickiness occurs on the surface.

(silicone rubber)

As the silicone rubber used in the vinyl chloride resin composition according to the embodiment of the present invention, dimethyl silicone rubber, methylphenyl silicone rubber, vinylphenyl silicone rubber, and methylvinylphenyl silicone rubber are suitable, for example.

In the embodiment of the present invention, the addition amount of the silicone rubber is required to be 0.1 parts by mass or more with respect to 100 parts by mass of the vinyl chloride resin. If the addition amount is less than 0.1 parts by mass, the necessary weather resistance cannot be obtained. Moreover, it is preferable that the addition amount is 5 parts by mass or less. When it exceeds 5 parts by mass, it is easy to cause problems in workability.

(Polyvinyl chloride resin)

Examples of the vinyl chloride resin include homopolymers of vinyl chloride (ie, polyvinyl chloride), copolymers of vinyl chloride with other monomers copolymerizable with them, and mixtures thereof. As a monomer copolymerizable with vinyl chloride, vinyl acetate, vinylidene chloride, (meth)acrylic acid, acrylonitrile, etc. are mentioned.

As the vinyl chloride resin, it is preferable to use one having an average polymerization degree of 1000 to 2500. Those having an average polymerization degree of 1000 to 2000 are more preferable from the viewpoint of heat resistance, cold resistance, and moldability. When the polymerization degree is lowered, moldability is improved, but heat resistance and cold resistance are lowered. Conversely, when the degree of polymerization increases, heat resistance and cold resistance improve, but moldability deteriorates.

The vinyl chloride resin may be used in a blend of two or more types having different degrees of polymerization, if necessary.

(other ingredients)

In the embodiment of the present invention, as long as the effects of the present invention can be obtained, in addition to the above components, polymers other than PVC, inorganic fillers, stabilizers, antioxidants, plasticizers, lubricants, colorants, ultraviolet absorbers, light stabilizers , cross-linking agent, additives such as cross-linking aid can be mixed in various ways.

For example, when it is desired to improve heat resistance, cold resistance, insulation, etc., other plasticizers such as phthalic acid esters, isophthalic acid esters, trimellitic acid esters, pyromellitic acid esters, and epoxidized soybean oil may be blended and used as necessary. good night.

〔wire〕

An electric wire according to an embodiment of the present invention includes a conductor and an insulating layer coated on an outer circumference of the conductor and made of the above-described polyvinyl chloride resin composition according to the embodiment of the present invention. It is characterized by doing.

1 is a cross-sectional view schematically showing an example of an electric wire according to an embodiment of the present invention.

As shown in Fig. 1, an electric wire 10 according to this embodiment includes a conductor 1 and an insulating layer 2 coated on the outer periphery of the conductor 1. As the conductor 1 to be covered, for example, a conductor having an outer diameter of about 0.15 to 7 mmφ can be used. A conductor made by twisting tin-plated annealed wire can be suitably used, but is not limited thereto. The number of conductors 1 is not limited to one as shown in FIG. 1, but may be plural.

The insulating layer 2 is composed of the above-mentioned vinyl chloride resin composition according to the embodiment of the present invention. The electric wire 10 can be obtained by covering it as an insulating layer by means of forming means such as extrusion coating. If necessary, a crosslinking treatment may be performed by a method such as electron beam irradiation.

In this embodiment, although the insulating layer is constituted by a single layer as in Fig. 1, it is also possible to make it a multilayer structure. In this case, at least the outermost layer is formed using the above-mentioned vinyl chloride resin composition.

〔cable〕

A cable according to an embodiment of the present invention is characterized in that the polyvinyl chloride resin composition according to the embodiment of the present invention is used as a covering material (sheath or insulating layer and sheath).

Fig. 2 is a cross-sectional view schematically showing an example of a cable according to an embodiment of the present invention.

As shown in Fig. 2, the cable 20 according to the present embodiment includes three electric wires 10 according to the above embodiment in which the conductor 1 is covered with the insulating layer 2, and the inclusions such as paper A three-core stranded wire twisted together with an outer material (3), a pressure tape (4) wound around the outer periphery, and a sheath (5) extruded and coated on the outer periphery are provided. It is not limited to a 3-core twisted pair, but may be set as one electric wire (single core), or may be set as a multi-core twisted pair other than 3 cores. The pressure tape 4 may be omitted or may be replaced with a braid.

The sheath 5 is composed of the above-mentioned vinyl chloride resin composition according to the embodiment of the present invention. In this embodiment, although the insulating layer 2 was also comprised from the said vinyl chloride resin composition, it is not limited to this, Even if it is comprised from the other resin composition for insulating layers (it is preferable that it is a non-halogen flame retardant resin composition) good night. The sheath 5 may be crosslinked, if necessary, by a method such as electron beam irradiation.

In the present embodiment, although the sheath is composed of a single layer as in Fig. 2, it is also possible to make it a multilayer structure. In this case, at least the outermost layer is formed using the above-mentioned vinyl chloride resin composition.

(Example)

Hereinafter, the present invention will be described more specifically by examples. In addition, the present invention is not limited in any way by the following examples.

Examples are shown in Tables 1 and 2, and conventional examples and comparative examples are shown in Table 3.

<Method of producing test pieces (sheets)>

With respect to 100 parts by mass of PVC having an average polymerization degree of 1300, a plasticizer, silicone rubber, silicone oil, a calcium-zinc-based lead-free stabilizer as a stabilizer, and calcium carbonate as a filler were mixed in the proportions shown in Tables 1 to 3. Thereafter, a sheet having a thickness of 1 mm was molded by kneading (roll temperature: 160° C., 5 minutes) and pressing (press temperature: 180° C., preheating for 3 minutes, pressing for 2 minutes at 10 MPa). In addition, since the addition of 40 parts by mass or more of the plasticizer is required as an amount that can be kneaded with a roll, in the example where the addition amount of terephthalic acid ester is 10 parts by mass, DINP (diisononylphthalate) 30 parts by mass was blended and produced.

As the materials in Tables 1 to 3, the following were used.

(1) Vinyl chloride resin (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: TK-1300)

(2) plasticizer

· Terephthalic acid ester

DOTP (di-2-ethylhexyl terephthalate)

DINTP (diisononyl terephthalate)

Diisodecyl terephthalate (DIDTP)

· Phthalic acid ester

DINP (diisononyl phthalate)

DOP (di-2-ethylhexylphthalate)

(3) Silicone rubber (product of Shin-Etsu Silicone, trade name: KE-76)

(4) Silicone oil (Shin-Etsu silicone product, product name: KF-96-100cs)

(5) Stabilizer: Ca-Zn-based lead-free stabilizer

(6) Filler: Calcium carbonate (product of Marutou CO., LTD, product name: Softon 1500)

<Test Methods>

Weather resistance was evaluated by a metal halide lamp weathering acceleration tester (M6T) manufactured by Suga Test Instruments Co., Ltd. Sample surface irradiance 1.5kw/m ² , temperature 60°C, humidity 50%, distance between light source and sample 350mm, irradiation time 72 hours (120-minute cycles of 3-minute water fog + 117-minute irradiation × 36 cycles) conditions, the retention of elongation in the tensile test after/before irradiation and the appearance after irradiation were evaluated. Tensile tests were conducted in accordance with JISK 6723. In the evaluation judgment of the residual elongation rate, 60% or more was passed (◯), and less than 60% was made disqualified (×). In addition, the evaluation judgment of the external appearance was made into pass (○) when there was no crack (crack) on the sample surface after irradiation, and set it as fail (x) when there was. In the determination of weather resistance, a case where the elongation residual rate was acceptable and the external appearance was acceptable was regarded as a pass (○), and a case where any of the results were unacceptable was regarded as a failure (x). The results are shown in Tables 1 to 3.

The bleed resistance was evaluated in a constant temperature and humidity chamber at a temperature of 70°C and a humidity of 90%. After being left to stand for 72 hours and taken out, the case where there was no stickiness on the surface was regarded as pass (○), and the case where there was was regarded as disqualified (X). The results are shown in Tables 1 to 3.

(Table 1)

Examples (unit of compounding amount is parts by mass)

(Table 2)

Examples (unit of compounding amount is parts by mass)

(Table 3)

Conventional Examples and Comparative Examples (unit of blending amount is parts by mass)

In prior art examples 1 and 2 using DOP or DINP, which were carried out for reference, both weather resistance and bleed resistance were acceptable.

In Example 1 and Comparative Example 1, 10 parts by mass of DOTP was added. In Example 1 in which 0.1 part by mass of silicone rubber was added, weather resistance and bleed resistance were all acceptable, but in Comparative Example 1 in which silicone rubber was not added, weather resistance was improved. Since cracks occurred after the test and the appearance was disqualified, weather resistance was disqualified.

In Examples 2 and 3 and Comparative Examples 2 and 3, the amount of DOTP added was 40 parts by mass and 100 parts by mass, and Examples 2 and 3 in which 0.1 part by mass of silicone rubber was added were passed as in Example 1, whereas , Comparative Examples 2 and 3 to which silicone rubber was not added were disqualified in appearance as in the case of Comparative Example 1, and also disqualified in elongation retention, so the determination of weather resistance was disqualified.

From the above, it was found that at least 0.1 part by mass of silicone rubber is required for both weather resistance and bleed resistance.

From Examples 6, 11, and 13 and Comparative Examples 7 to 9, it was found that DOTP itself bleeds when the amount of DOTP exceeds 100 parts by mass, so that 100 parts by mass of DOTP is the limit.

From Examples 4 to 9, it was found that even when 2.5 to 5 parts by mass of silicone rubber was added, both weather resistance and bleed resistance were compatible.

From Examples 4 to 6 and Comparative Examples 4 to 6, it was found that both weather resistance and bleed resistance can be achieved with silicone rubber. However, although the weather resistance was improved in silicone oil, stickiness occurred due to bleeding on the surface of the composition.

From Examples 4, 6, and 10 to 13, it was found that the same tendency as the above results was observed for the number of carbon atoms C8 to C10 in the alkyl chain of terephthalic acid ester.

In addition, the present invention can be implemented with various modifications without being limited to the above embodiments and examples.

1: conductor
2: Insulation layer
3: inclusions
4: pressure tape
5 : Sith
10: wires
20: cable

Claims (7)

An electric wire having an insulating layer made of a polyvinyl chloride resin composition (PVC) containing terephthalic acid ester as a plasticizer, wherein the polyvinyl chloride resin composition is 40 parts by mass or more and 100 parts by mass or less of the terephthalic acid ester and 0.1 part by mass or more and 5 parts by mass or less of silicone rubber based on 100 parts by mass of the vinyl resin,
The terephthalic acid ester is a wire made of diisononyl terephthalate or diisodecyl terephthalate.
A cable equipped with a sheath made of a vinyl chloride resin composition containing terephthalate as a plasticizer, wherein the vinyl chloride resin composition comprises 40 parts by mass or more of the terephthalate ester with respect to 100 parts by mass of the vinyl chloride resin , 100 parts by mass or less, containing 0.1 parts by mass or more and 5 parts by mass or less of silicone rubber,
The terephthalic acid ester is a cable made of diisononyl terephthalate or diisodecyl terephthalate.
According to claim 2,
A cable having the wire of claim 1.
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