KR100803441B1 - Composition for producing of insulating material with low smoke and high elongation ratio - Google Patents

Abstract

The present invention relates to a composition for producing a low smoke high elongation insulating material. The composition for producing a low smoke and high elongation insulating material provided in the present invention may include 120 to 250 parts by weight of an inorganic flame retardant based on 100 parts by weight of a basic resin; And 2 to 50 parts by weight of a moisture absorbent. The composition for producing a low smoke high elongation insulating material provided in the present invention is preferably used for producing an insulating coating layer of an electric wire. According to the present invention, by using a mixed resin obtained by properly blending the basic resin, and by forming a composition to include additives such as metal hydroxide inorganic flame retardant and lubricant, processing aid, which is not surface treatment, tensile strength and high elongation and smoke It can be used for the production of an insulating material of an electric wire that can simultaneously satisfy the density characteristic and the like, for example, a sheath layer constituting an insulating coating layer.

Low smoke, high elongation, blending resin, smoke density, heat deformation

Description

Composition for producing of insulating material with low smoke and high elongation ratio

The following drawings attached to this specification are illustrative of preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a cross-sectional view for explaining the structure of an insulated wire according to the present invention.

<Description of main parts of drawing>

21 Insulated wire 11 Conductor 12 Inner semiconducting layer

13 Insulation layer 14 External semiconducting layer 15 Bedding layer

17 metal shield layer 19 sheath layer

The present invention relates to a composition for producing a low smoke and high elongation insulating material, and more particularly, using a metal hydroxide inorganic flame retardant which is not surface treated while using a blended resin blended as a proper resin, and absorbs moisture present in the composition. The present invention relates to a composition for producing a low smoke and high elongation insulating material that can reduce the amount of smoke that can be generated during combustion.

In the case of the basic resin and the flame retardant used in the composition for manufacturing a conventional insulating material, it contains a small amount of water. Such traces of water may cause crosslinking reactions during the compounding and extrusion process, which may render the process impossible, and even if the surface treatment is performed on the inorganic flame retardant or other inorganic materials included in the composition for preparing the insulating material, the minute moisture may be completely removed. Due to a problem that is difficult to exclude, there are still technical limitations that cannot solve the problems associated with crosslinking reactions.

On the other hand, if the inorganic flame retardant surface-treated for this purpose is used in the composition for producing an insulating material, the mechanical and flame retardant properties of the polymer composition are partially improved, but when performing the smoke density measurement test at a specimen thickness of 3.0 mm by the method of ASTM E662, It is known that there are technical limitations in that smoke density characteristics cannot meet the required thresholds. That is, the criterion for judging the pass and fail of the smoke density test is judged to be a pass when the maximum smoke density value is 150 or less based on the specimen thickness of 3.0 mm by the flame mode method of ASTM E662. In particular, in the applications where low smokeability is required, the production of insulating materials for electric wires meeting these standard conditions has become an important factor.

According to Korean Patent No. 10-0479529, a flame retardant mixture containing no halogen, including metal salts, metal hydroxides and silicone oils, is disclosed, based on a thermoplastic material having high heat resistance. However, it does not contain halogen, which is environmentally friendly, has high heat resistance and high oxygen index. However, the problem of high smoke density has been pointed out.

On the other hand, in the case of insulated wire, sufficient mechanical properties, heat resistance, etc. required according to the use purpose and environment should be secured sufficiently. When low smoke resistance and high elongation are required, the use of surface-treated metal hydroxide inorganic flame retardant is preferable. It is known that it did not.

In this way, in addition to the use of appropriately blended base resins, the selection of inorganic flame retardants and the use of appropriately blended base resins can be achieved simultaneously to sufficiently satisfy the general physical properties required for insulated wire materials, while also improving heat resistance, low smoke resistance and extrusion processability. Various measures and studies for the removal of moisture in the composition, which influences the amount of smoke, have been continuously made in the related field, and the present invention has been devised under this technical background.

Technical problem to be solved by the present invention based on the above-described conventional problems, the problem that the mechanical properties or processability deterioration occurs when an excessive amount of inorganic flame retardant is used in order to have a high heat resistance, low smoke resistance and high elongation It is an object of the present invention to provide a composition for producing a low smoke high elongation insulating material that can achieve the technical problem.

In order to achieve the technical problem to be achieved by the present invention, the composition for producing a low smoke and high elongation insulating material provided in the present invention, based on 100 parts by weight of the base resin, 120 to 250 parts by weight of an inorganic flame retardant; And 2 to 50 parts by weight of a moisture absorbent. On the other hand, the composition for manufacturing a low smoke high elongation insulating material provided by this invention is preferable when it is used for manufacture of the insulation coating layer of an electric wire.

Hereinafter, specific examples will be described in order to help the understanding of the present invention, and in the following case, with reference to the drawings will be described in more detail. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art.

The base resin of the composition for preparing a low smoke and high elongation insulating material according to the present invention is ethylene vinyl acetate (EVA) having a vinyl acetate content of 15 to 25% by weight, and ethylene ethyl acrylate having an ethyl acrylate content of 15 to 25% by weight (EEA). ), Ethylene butyl acrylate (EBA) having a butyl acrylate content of 15 to 25% by weight, and ethylene methyl acrylate (EMA) having a methyl acrylate content of 15 to 25% by weight 60 to 90 weight%; And 10 to 40% by weight of linear low density polyethylene having maleic anhydride introduced therein. Regarding the numerical range for the content of vinyl acetate, ethyl acrylate, butyl acrylate and methyl acrylate contained in each of the copolymerized resins of EVA, EEA, EBA and EMA, which are optionally included in the blended mixed resin, If it is less than the lower limit, the compatibility with the flame retardant is not preferable. If the upper limit is exceeded, smoke defects occur, which is not preferable. On the other hand, with respect to the content of the linear low density polyethylene in which the maleic anhydride optionally included in the blended mixed resin is introduced, if it is less than the lower limit, it is difficult to secure compatibility with the resin or to secure the heat deformation property, which is not preferable. If it is exceeded, it is not preferable because it is difficult to add the flame retardant and the physical properties are not maintained.

In addition, the base resin of the composition for producing a low-foam high elongation insulating material according to the present invention, ethylene vinyl acetate (EVA) having a vinyl acetate content of 15 to 25% by weight, ethylene ethyl acrylate having an ethyl acrylate content of 15 to 25% by weight (EEA), ethylene butyl acrylate (EBA) having a butyl acrylate content of 15 to 25% by weight, and ethylene methyl acrylate (EMA) having a methyl acrylate content of 15 to 25% by weight 60 To 90% by weight; 5-35 weight percent linear low density polyethylene; And 5 to 35% by weight of linear low density polyethylene having maleic anhydride introduced therein. In the blended mixed resin, with respect to the content of the copolymer resin optionally included, it is not preferable that the flame retardant is difficult to enter and the physical properties cannot be maintained when the content is lower than the lower limit. Not desirable to secure

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention comprises 120 to 250 parts by weight of an inorganic flame retardant based on 100 parts by weight of the base resin. In relation to the numerical range of the content of the inorganic flame retardant, when the lower limit is reached, the oxygen index value is 30 or less, so that the flame retardancy is not sufficiently expressed, and when the upper limit is exceeded, the specific gravity of the composition is increased so that the workability is significantly decreased. And the mechanical properties are lowered, which is undesirable. The inorganic flame retardant included in the composition for producing a low smoke and high elongation insulating material provided by the present invention is preferably a metal hydroxide in an untreated state, and the metal hydroxide is any one or two or more metal hydroxides selected from aluminum hydroxide and magnesium hydroxide. It is more preferable if it is.

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention comprises 2 to 50 parts by weight of a moisture absorbent based on 100 parts by weight of the base resin. Regarding the numerical range of the moisture absorbent content, if it is lower than the lower limit, the effect of reducing the smoke density is insignificant, and thus it is difficult to achieve the purpose of addition. If the upper limit is exceeded, the effect is not increased in proportion to the amount of addition. It is not preferable for the reason of lowering physical properties. The moisture absorbent included in the composition for producing a low smoke high elongation insulating material provided in the present invention is preferably any one of moisture absorbents selected from calcium oxide, magnesium oxide, aluminum oxide, and zinc oxide.

The composition for producing a low smoke and high elongation insulating material according to the present invention preferably further comprises any one material or two or more materials selected from a lubricant, a silicon processing aid, an antioxidant, and carbon black.

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention further comprises 0.5 to 5 parts by weight of a lubricant based on 100 parts by weight of the base resin. Regarding the numerical range of the lubricant content, it is not preferable that the lower limit is difficult to achieve the purpose of addition, and if the upper limit is exceeded, it may fail in the smoke density test result, and it acts as a reason for developing low tensile strength. Not desirable

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention further comprises 0.1 to 2 parts by weight of a silicon-based processing aid based on 100 parts by weight of the base resin. In relation to the numerical range for the content of the silicon-based processing aid, if the lower limit is not reached, the effect of reducing the load during processing does not occur and also the effect of reducing the smoke density does not occur, which is difficult to achieve the purpose of addition, which is not preferable. If exceeded, the load in processing decreases, but it is not preferable because the overadded portion diffuses from the finished product to the surface, resulting in poor appearance.

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention further comprises 0.5 to 5 parts by weight of an antioxidant based on 100 parts by weight of the base resin. In relation to the numerical range of the content of the antioxidant, if the lower limit is less than difficult to achieve the purpose of addition, it is not preferable, if the upper limit is exceeded, the effect of proportional to the addition amount is not achieved, of course, the blooming or bleed out effect is It is not desirable to occur.

It is preferable that the composition for manufacturing a low smoke high elongation insulating material according to the present invention further comprises 2 to 10 parts by weight of carbon black based on 100 parts by weight of the base resin. In relation to the numerical range of the carbon black content, the lower limit is not preferable because it can not act as a stabilizer against ultraviolet rays, and if the upper limit is exceeded, it is not preferable because the effect is not increased in proportion to the amount added.

The composition for producing a low smoke high elongation insulating material provided in the present invention is preferably used for producing an insulating coating layer of an electric wire. In addition, various additives conventionally used to prepare a cable insulation coating layer may be further used in the composition for preparing a low smoke and high elongation insulating material according to the present invention within a range that does not impair the effects of the present invention. Examples of such additives include, but are not limited to, heat stabilizers, lubricants, antiblocking agents, antistatic agents, waxes, coupling agents, pigments, and the like. The low smoke high elongation insulating material composition according to the present invention may be prepared by a method known in the art, but is not particularly limited in the method. At this time, it is apparent that a kneader, Benbury or an open roll can be used. The composition for producing a low-flammable flame retardant according to the present invention may be applied to various kinds of sheath layers, such as wires, telephone lines, cables, buffer layers, insulating layers, and the like, but is not limited thereto.

Example (1-4) and Comparative example (1-4)

As shown in Table 1 below, Examples (1-4) and Comparative Examples (1-4) according to the present invention having different compositions were set separately.

division Example (1-4) Comparative example (1-4) One 2 3 4 One 2 3 4 Resin A 70 80 70 85 - 70 70 95 Resin B - - - - 70 - - - Resin C 20 20 20 15 20 20 20 5 Resin D 10 - 10 - 10 10 10 - Inorganic flame retardant 130 140 130 140 130 130 130 130 Hygroscopic (Calcium Oxide) 5 5 5 5 - 55 - - Lubricant 2.5 2.5 2.5 2.5 2.5 2.5 6 2.5 Processing aid 0.5 0.5 0.5 0.5 0.5 0.5 2 0.5 Antioxidant 2 2 2 2 2 2 2 2 Carbon black 5 5 5 5 5 6 5 5

In Table 1, 'resin A' represents an ethylene vinyl acetate copolymer resin having a vinyl acetate content of 17 wt%, 'resin B' represents an ethylene vinyl acetate copolymer resin having a vinyl acetate content of 28 wt%, and 'resin C''Indicates a linear low density polyethylene resin in which maleic anhydride is introduced,' resin D 'refers to a linear low density polyethylene resin, ethylene vinyl acetate copolymer resin containing 19% by weight of vinyl acetate combined with an unsaturated organic silane,' inorganic Flame retardant 'refers to aluminum hydroxide (Al (OH) ₃ ) that has not been surface treated. In Table 1, the lubricant was used a fatty acid-based metal salt, the processing aid was a low molecular weight polyethylene wax, the antioxidant was used an amine antioxidant, respectively.

Each composition prepared according to Table 1 was kneaded in a kneader for 20 minutes, and then molded for 10 minutes in a press at a temperature of 170 ° C. to prepare specimens for measuring physical properties, respectively. In addition, using the respective compositions prepared in accordance with Table 1 to prepare a wire material specimen (cable) having a cross-sectional structure as shown in FIG.

1 is a cross-sectional view for explaining the structure of the insulated wire 21 according to the present invention.

Referring to FIG. 1, the inner semiconducting layer 12 surrounds the conductor 11 at the center, and the insulating layer 13 surrounds the inner semiconducting layer 12. The outer semiconducting layer 14 is wrapped. Subsequently, a bedding layer 15 covering the entire outer semiconducting layer 14 is formed, and the metal shielding layer 17 surrounds the outer surface of the bedding layer 15. Finally, the sheath layer 19 surrounds the outside of the metal shielding layer 17 as a whole. At this time, the thickness of the insulating layer 13 of the cable was 0.5 to 5mm.

Tensile strength and elongation at room temperature, volume resistivity, heating strain and smoke density were performed for each of the specimens prepared using the compositions prepared according to the compositional examples separately set according to Table 1, and the results are shown in Table 2, respectively. Based on these measured results, the general results of the productability is also shown in Table 2 together.

The room temperature characteristics are preferably 0.92kgf / mm2 or more and 200% or more elongation when the daughter tensile strength and elongation are measured according to the KSC-3004 standard, and the insulation resistance was measured using HP 4339B and HP 1600B volume resistivity measuring devices. In this case, the value of 10 ¹⁴ Ω · ㎝ or more is preferable, and in case of heating deformation, 1kg is added for 30 minutes at the temperature of 121 ℃ according to the KSC-3403 standard, the thickness reduction rate should be 50% or less. The smoke density is preferably 150 or less when the smoke density is measured in the flame mode of ASTM E662 for a specimen having a thickness of 3.0 mm.

division Example (1-4) Comparative example (1-4) One 2 3 4 One 2 3 4 Tensile strength (kgf / ㎡) 1.4 1.31 1.45 1.25 1.12 0.85 0.81 1.02 Elongation (%) 320 290 316 285 310 70 420 145 Volume wc resistance (10 ¹⁴ Ω · cm) 8.2 4.5 7.4 4.4 0.3 2.0 0.2 3.2 Heating strain (%) 18 25 21 28 28 15 43 58 Smoke density 121 85 85 90 90 110 280 135 General comment pass pass pass pass fail fail fail fail

As can be seen through Table 2, all of the examples (1 to 4) satisfy all of the reference values required for the tensile strength and elongation, which are room temperature characteristics, Comparative Example 2 is required for the tensile strength and elongation Not all of the standard values are satisfied, and Comparative Example 3 is not preferable because the tensile strength, Comparative Example 4 is less than the standard value required for the elongation. On the other hand, in relation to volume resistance, the reference values required in all the cases of Examples 1 to 4 are satisfied, but in Comparative Examples 1 and 3, the reference values are not met, which is not preferable. Regarding the heating strain, all the cases except for Comparative Example 4 satisfy the required reference values. Finally, with respect to the smoke density, all of the cases except for Comparative Example 3 satisfy the requirements.

As a result of considering all the results shown in Table 2 as a whole, all of the examples (1 to 4) are preferred because the present invention sufficiently expresses the above-described effects, but is comparative example (1 to 4). In all cases of), it can be seen that it is not preferable because it can be seen that it does not meet the standard value required in at least one property evaluation, and it is shown as passing or failing in the general evaluation.

Optimal embodiments of the present invention described above have been disclosed. Although specific terms have been used herein, they are used only for the purpose of describing the present invention in detail to those skilled in the art, and are not used to limit the scope of the present invention as defined in the meaning or claims.

According to the present invention, by using a mixed resin obtained by properly blending the basic resin, and by forming a composition to include additives such as metal hydroxide inorganic flame retardant and lubricant, processing aid, which is not surface treatment, tensile strength and high elongation and smoke It can be used for the production of an insulating material of an electric wire capable of simultaneously satisfying density characteristics, for example, a sheath layer constituting an insulating coating layer.

Claims (9)

For 100 parts by weight of basic resin, 120 to 250 parts by weight of an inorganic flame retardant; And 2 to 50 parts by weight of the moisture absorbent; comprising; The base resin is vinyl acetate content of 15 to 25% by weight ethylene vinyl acetate (EVA), ethyl acrylate content of 15 to 25% by weight ethylene ethyl acrylate (EEA), butyl acrylate content of 15 to 25 weight 60 to 90% by weight of a copolymer resin of any one selected from ethylene butyl acrylate (EBA) which is%, and ethylene methyl acrylate (EMA) having a methyl acrylate content of 15 to 25% by weight; And 10 to 40% by weight of linear low density polyethylene having maleic anhydride introduced therein; The inorganic flame retardant is a metal hydroxide in the surface untreated state, The moisture absorbent is a composition for producing a low smoke and high elongation insulating material, characterized in that any one of the moisture absorbent selected from calcium oxide, magnesium oxide, aluminum oxide, and zinc oxide. The method of claim 1, The metal hydroxide is any one or two or more metal hydroxides selected from aluminum hydroxide and magnesium hydroxide, the composition for producing a low smoke high elongation insulating material. For 100 parts by weight of basic resin, 120 to 250 parts by weight of an inorganic flame retardant; And 2 to 50 parts by weight of the moisture absorbent; comprising; The base resin is vinyl acetate content of 15 to 25% by weight ethylene vinyl acetate (EVA), ethyl acrylate content of 15 to 25% by weight ethylene ethyl acrylate (EEA), butyl acrylate content of 15 to 25 weight 60 to 90% by weight of a copolymer resin of any one selected from ethylene butyl acrylate (EBA) which is%, and ethylene methyl acrylate (EMA) having a methyl acrylate content of 15 to 25% by weight; 5-35 weight percent linear low density polyethylene; And 5 to 35 wt% of linear low density polyethylene having maleic anhydride introduced therein; The inorganic flame retardant is a metal hydroxide in the surface untreated state, The moisture absorbent is a composition for producing a low smoke and high elongation insulating material, characterized in that any one of the moisture absorbent selected from calcium oxide, magnesium oxide, aluminum oxide, and zinc oxide. The method of claim 3, The metal hydroxide is any one or two or more metal hydroxides selected from aluminum hydroxide and magnesium hydroxide, the composition for producing a low smoke high elongation insulating material. The method according to any one of claims 1 to 4, The composition for producing a low smoke high elongation insulating material, 0.5 to 5 parts by weight of lubricant based on 100 parts by weight of the base resin; 0.1 to 2 parts by weight of a silicon based processing aid based on 100 parts by weight of the base resin; 0.5 to 5 parts by weight of antioxidant based on 100 parts by weight of the base resin; And 2 to 10 parts by weight of carbon black based on 100 parts by weight of the base resin; The composition for producing a low smoke and high elongation insulating material, characterized in that it further comprises any one material selected from two or more materials. delete delete delete delete

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