JP2893284B2 - Outdoor trough - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a novel outdoor trough, and more specifically, a polyethylene resin molding material having excellent low-temperature impact resistance, rigidity and moldability, and having a certain degree of flame retardancy. The present invention also relates to a plastic outdoor trough (including a joint) made of a polyethylene resin molding material having excellent weather resistance in addition to the above-mentioned properties, which can greatly reduce the construction period and is inexpensive to construct.

[Related Art] Conventionally, concrete is generally used as a material for outdoor troughs such as cable troughs. However, since the concrete outdoor trough is heavy in weight, it has poor workability, and further has a drawback that, depending on the climate, there is a possibility that the delivery date will be delayed.

On the other hand, plastics are lightweight and are not affected by the climate, so the above-mentioned problem can be solved. However, impact properties, especially low-temperature impact properties and stiffness, and even weather resistance, make them outdoors. There is a drawback that the function (protection of the contents) as a trough cannot be sufficiently exhibited.

Therefore, in order to make the outdoor trough made of plastic, it is necessary to use an inexpensive plastic material that is excellent in low-temperature impact resistance, rigidity, moldability, and preferably weather resistance.

[Problems to be Solved by the Invention] Under such circumstances, the present invention provides an inexpensive plastic molding material that is excellent in low-temperature impact resistance, rigidity and moldability, and also has the above-mentioned properties and also has weather resistance. The object of the present invention is to provide an outdoor trough (including a joint) made of an excellent plastic molding material, which can greatly shorten the construction period and has a low construction cost.

[Means for Solving the Problems] As a result of intensive studies on a plastic outdoor trough, the present inventors have used a polyethylene resin as a plastic, and added a halogen-based flame retardant and a metal oxide to each of the predetermined materials. The molding material blended in a ratio is excellent in low-temperature impact resistance, rigidity and moldability, has some flame retardancy, is inexpensive, and further contains a light stabilizer and / or carbon black in a predetermined ratio. The compounded molding material is excellent in weather resistance in addition to the above properties, and by making an outdoor trough using these plastic molding materials, the construction period can be significantly reduced, and They found that the cost was low and completed the present invention based on this finding.

That is, the present invention relates to (A) 100 parts by weight of a polyethylene resin, (B) 1 to 25 parts by weight of a halogen-based flame retardant, and (C) 0.2 to 15 parts by weight of a metal oxide.
(D) An outdoor trough comprising a molding material containing 0.001 to 3 parts by weight of a light stabilizer and / or 0.0001 to 3 parts by weight of carbon black.

 Hereinafter, the present invention will be described in detail.

The polyethylene resin of the component (A) in the molding material used for the body of the outdoor trough of the present invention has a melt index (MI) of 0.02 to 5.5 g / 10 minutes, preferably 0.02 to 5.5 g / 10 minutes.
3~2.0g / 10 min, more preferably in the range of 0.1 to 1.0 g / 10 min, and a density 0.940~0.969g / cm ^3, preferably 0.945
Those in the range of 0.90.965 are preferred. The MI is 0.02 g / 1
If the time is less than 0 minutes, the extrudability is inferior, and if it exceeds 5.5 g / 10 minutes, the rigidity and the low-temperature impact resistance are reduced and the extrudability tends to be deteriorated. The density is 0.940g / c
It stiffness those less than m ³ is not sufficient, a tendency that low temperature impact resistance decreases exceeds 0.969 g / cm ^3.

The polyethylene resin of the component (A) in the molding material used for the joint of the outdoor trough of the present invention has a melt index (MI) of 0.2 to 15 g / 10 minutes, preferably 1.0 to 1.0.
10 g / 10 min, more preferably in the range of 3-7 g / 10 min,
And density 0.940~0.969g / cm ^3, preferably 0.945 to 0.96
Those in the range of 8 g / cm ³ are preferred. The MI is 0.2 g / 10
If it is less than 15 minutes, the injection moldability is inferior, and if it exceeds 15 g / 10 minutes, the rigidity and low-temperature impact resistance tend to decrease. If the density is less than 0.940 g / cm ³ , the rigidity is not sufficient,
If it exceeds 9 g / cm ³ , the low-temperature impact resistance tends to decrease.

Note that MI is 190 ° C under a load of 2.according to JIS K-7210.
It is a value measured under the condition of 16 kg, and the density is JIS K-7112
It is a value measured after annealing at a temperature of 120 ° C. for 1 hour in accordance with the above.

The halogen-based flame retardant used as the component (B) in the molding material includes a bromine-containing flame retardant and a chlorine-containing flame retardant. Examples of the bromine-containing flame retardant include decabromodiphenyl oxide, tetrabromobisphenol A, tetrabromo Bisphenol S, bistribromophenoxyethane, polydibromophenylene oxide, tetrabromobisphenol A carbonate oligomer, polytribromostyrene, brominated bisphenol A type epoxy polymer, ethylene bistetrabromophthalimide, hexabromocyclododecane, hexabromobenzene, etc. However, the present invention is not limited to these.
Among these, those with a molecular weight of 200-1500, and even 600
Those having a value of from 1000 to 1000 are remarkably preferable in improving the low-temperature impact resistance.

Examples of the chlorine-containing flame retardant include, for example, perchloropentacyclodecane, chlorinated paraffin, chlorinated polyethylene, and the like, but are not limited thereto.

Among these halogen-based flame retardants, bromine-containing flame retardants are preferred from the viewpoint of low-temperature impact resistance, and decabromodiphenyl oxide is particularly preferred.

The halogen-based flame retardants may be used alone or in combination of two or more, and the blending amount thereof is 1 to 25 parts by weight per 100 parts by weight of the polyethylene resin (A). It is necessary to select from preferably 3 to 17 parts by weight, more preferably 4 to 15 parts by weight. When the amount is less than 1 part by weight, the effect of improving the low-temperature impact property of the obtained composition is not sufficiently exhibited, and the effect of imparting flame retardancy is small. When the amount exceeds 25 parts by weight, the low-temperature impact property tends to be rather lowered. Be looked at.

In the molding material, examples of the metal oxide used as the component (C) include, for example, antimony oxide, titanium oxide, zinc oxide, molybdenum oxide, tin oxide, zirconium oxide, magnesium oxide, and iron oxide. However, the present invention is not limited to this. Among these metal oxides, antimony oxide, titanium oxide and zinc oxide are preferable, and those having an average particle size of 0.01 to 8 μm, preferably 0.3 to 0.7 μm are suitable.

These metal oxides may be used alone or in combination of two or more. The compounding amount thereof is 0.2 parts per 100 parts by weight of the polyethylene resin (A).
It is necessary to select in the range of ~ 15 parts by weight. If the amount is less than 0.2 part by weight, the effect of improving low-temperature impact resistance is not sufficiently exhibited, and the effect of imparting flame retardancy is small. If the amount exceeds 15 parts by weight, the low-temperature impact resistance tends to be rather lowered. The metal oxide is desirably used in a ratio of 1/4 to 1/2 times the weight of the halogen-based flame retardant of the component (B).

The molding material used for the outdoor trough of the present invention may optionally contain a light stabilizer and / or carbon black as the component (D) in order to improve weather resistance. Examples of the light stabilizer include, but are not limited to, benzophenone compounds, salicylic acid compounds, benzotriazole compounds, hindered amine compounds, nickel compounds, cyanoacrylate compounds, and the like. Among these, ultraviolet absorbers are preferable, and benzotriazole compounds are particularly preferable. Examples of the benzotriazole compounds include Tinuvin P, Tinuvin 326, and Tinuvin 327 (trade name, manufactured by Ciba Geigy). .

One of these light stabilizers may be used alone, or two or more thereof may be used in combination. The compounding amount thereof is 0.001 to 3 parts by weight, preferably 100 to 3 parts by weight, per 100 parts by weight of the polyethylene resin (A). It is selected in the range of 0.01 to 1.5 parts by weight. If the amount is less than 0.001 part by weight, the effect of improving weather resistance is not sufficiently exhibited, and if it exceeds 3 parts by weight, the low-temperature impact resistance tends to decrease, and the surface appearance due to yellowing and bleeding tends to deteriorate.

On the other hand, there is no particular limitation on the carbon black, but those obtained with a furnace having an average particle size of 10 to 30 μm are preferred in terms of rigidity and low-temperature impact resistance. The compounding amount of the carbon black is selected in the range of 0.0001 to 3 parts by weight, preferably 0.0001 to 1 part by weight, based on 100 parts by weight of the polyethylene resin (A). This amount is 0.
If the amount is less than 0001 parts by weight, the effect of improving the weather resistance is not sufficiently exhibited, and if it exceeds 3 parts by weight, the low-temperature impact resistance tends to decrease.

In the present invention, as the component (D), only the light stabilizer may be used, only carbon black may be used, or both may be used in combination.

In the molding material used for the outdoor trough of the present invention, as far as the purpose of the present invention is not impaired, if necessary, various known additives such as calcium carbonate and calcium sulfate,
Inorganic fillers such as magnesium sulfate, barium sulfate, talc, mica, silica, asbestos, glass beads, glass flakes, alumina, quartz powder, metal powder, reinforcing agents such as glass fiber, carbon fiber, metal fiber, metal whisker, and oxidation Additives such as antioxidants, other ultraviolet absorbers, heat stabilizers, release agents such as silicone oil and wax, lubricants, phosphorus-based and inorganic flame retardants, antistatic agents, coloring agents, and other heat Plastic resins, rubbers, elastomers and the like can be added.

The method of preparing the molding material is not particularly limited. For example, the component (A), the component (B), the component (C), and the component (D) and various additional components that may be used,
It can be prepared by melt-kneading using a ribbon blender, tumble mixer, Henschel mixer, oven roll, Banbury mixer, single screw extruder, twin screw extruder, single screw reciprocating screw kneader, or the like.

The outdoor trough of the present invention can be obtained by molding the molding material thus prepared into a desired shape by a known molding method, for example, an extrusion molding method, an injection molding method, a press molding method, or the like. An extrusion molding method is suitable as a method for molding the trough main body, and an injection molding method is suitable as a method for molding a joint for the outdoor trough.

Further, regarding the structure of the trough, since the molding material is excellent in low-temperature impact resistance and rigidity, a thin-walled hollow structure (double-wall structure) is possible.

[Examples] Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

In addition, each physical property of the molding material and the trough was obtained as follows.

-Physical properties of molding material (1) Low temperature impact property A DuPont impact test at -15 ° C was performed using a Dupont impact tester (manufactured by Tokyo Testing Machine Co., Ltd.) in accordance with JIS K-7121.

The test is performed by dropping a 2 kg load naturally from an arbitrary height, and hitting the hammer (1/2 inch φ) on the center of a 70 × 70 × 3 mm square plate specimen injection molded at a temperature of 230 ° C. Piece of 5
The height at which 0% breaks was determined. The test conditions were as follows: temperature -15 ° C (cooling time 1 hour or more), test plate holding pressure 4 ~
5 kg / cm ² , anvil 2 inch φ.

(2) Flame retardancy (A) Using a 1/8 inch thick test piece, the flame retardancy was determined in accordance with the US UL94 standard.

(B) A horizontal combustion test was performed using a 1/8 inch thick UL94 standard test piece. 1 inch blue flame (methane gas)
The specimen was contacted for 30 seconds, the flame was removed from the test piece, and the residual flame time was measured.

(3) Yield tensile strength JIS No. 2 dumbbell was used and determined in accordance with JIS K-7113.

(4) Weather resistance For a test piece obtained by punching a tensile impact S-type dumbbell from a 150 × 150 × 1.6 mm plate press-formed at 230 ° C. with a punching sword, a sunshine carbon arc lamp weather meter based on JIS B-7775 [ Suga Test Machine Co., Ltd.], at a temperature of 63 ° C., a humidity of 50% RH, and a precipitation of 12 minutes / 60 minutes.

A sample was taken out at an arbitrary time, and a tensile impact test was performed at 23 ° C. in accordance with ASTM D-1822, and a time at which the retention of tensile impact strength reached 50% was determined.

(5) Rigidity (tensile elastic modulus) Rigidity (tensile elastic modulus by 1% secant) was determined using JIS No. 2 dumbbell in accordance with JIS K-7113.

・ Trough physical properties (a) Low-temperature impact property A 70 × 70 × 3 mm square plate test piece was cut out from the upper surface of the trough lid, and this test piece was used. Then, a DuPont impact test at −15 ° C. was performed.

(B) Flame retardant 3.0 mm thick, 12 mm wide and 127 mm long from the top of the trough lid
Was cut out, and the flame retardancy was evaluated in accordance with the US UL94 standard.

(C) Yield tensile strength A test piece (JIS No. 2 dumbbell) was punched out from the top surface and the side surface of the trunk of the trough, and determined in accordance with JIS K-7113.

(D) Weather resistance A sample obtained by cutting the trough lid to a length of 150 mm was used as a sample, and the weather resistance of the molding material was determined in the same manner as in (4) the method of measuring weather resistance.

However, the irradiation surface is the upper surface of the trough lid, a sample is taken out at an arbitrary time, and a tensile impact S-type dumbbell is punched out.
A tensile impact test was performed.

(E) Rigidity (tensile elastic modulus) A test piece (JIS No. 2 dumbbell) was punched out from the upper surface and the side of the trunk of the trough, and the rigidity (1%) was measured in accordance with JIS K-7113.
Tensile modulus according to the score line) was obtained.

 The symbol of each component in the table means the following.

(B) Polyethylene A _1: MI0.26g / 10 min, density 0.964 g / cm ³ (manufactured by Idemitsu Petrochemical Co., Ltd. Idemitsu Polyethylene 520MB) A _2: MI0.24g / 10 min, density 0.949 g / cm ³ (Idemitsu oil chemical Co., Ltd. Idemitsu polyethylene 550P) A _3: MI11.0g / 10 min, density 0.956 g / cm ³ (manufactured by Idemitsu petrochemical Co., Ltd. Idemitsu polyethylene 130J) A _4: MI5.3g / 10 min density 0.968g / cm ³ (Idemitsu Petrochemical Co., Ltd. Idemitsu Polyethylene 210J) However, MI measurement conditions: 190 ° C, 2.16 kg load (JIS K-7210) Density measurement conditions: 120 ° C x 1 hour annealing (JIS K-7112) ( b) halogen-based flame retardant B _1: decabromodiphenyl oxide [Manac Co., EB-10WS] B _2: hexabromocyclododecane [Dai-ichi Kogyo Seiyaku Co., Ltd., SR-104] (c) a metal oxide object C _1: antimony trioxide [Nihonseiko Co., ATOX-S] C _2: titanium oxide [Thailand oxide group Co., R-TC30, a chlorine method Chirutaipu] C _3: titanium oxide [manufactured by Ishihara Sangyo Kaisha Ltd., TIPAQUE CR-60-2, chlorine method rutile type] (d) light stabilizer D _1: benzotriazole ultraviolet absorbers [Nippon Ciba-Geigy Corp., Tinuvin 326 (e) carbon black E _1: Cabot Corporation, Vulcan 9A-32 examples 1-9 were dry blended components of types and amounts shown in Comparative examples 1 and 2 table 1,
Pellets were prepared by kneading using a 50 mmφ single-axis kneader at a temperature of 200 ° C. and a screw rotation speed of 80 rpm.

Using these pellets, injection molding, low-temperature impact,
Test pieces for evaluating flame retardancy, tensile strength and rigidity were prepared, while test pieces for evaluating weather resistance were prepared by press molding. The molding temperature was 23 for both injection molding and press molding.
It was 0 ° C.

The physical properties of these test pieces were measured, and the results are shown in Table 1.

Example 10, Comparative Example 3 The components of the types and amounts shown in Table 1 were dry blended,
Pellets were prepared by kneading using a 50 mmφ single-axis kneader at a temperature of 200 ° C. and a screw rotation speed of 80 rpm.

Using these pellets, by extrusion molding (forming temperature
230 ° C), trough lid (60m high) as shown in Fig. 1
m, width 165mm, length 2000mm) and trunk (depth 150mm, width 150)
mm, 2000 mm in length) and their physical properties were determined. The results are shown in Table 1.

Examples 11 and 12 Each component of the type and amount shown in Table 1 was dry blended,
Using a twin-screw kneader (FCM), the temperature is 200 ° C and the rotor speed is
Pellets were prepared by kneading at 700 rpm.

A test piece was prepared using the pellets in the same manner as in Example 1, and each physical property was measured. The results are shown in Table 1.

[Effects of the Invention] The outdoor trough of the present invention comprises a molding material in which a halogen-based flame retardant, a metal oxide, and optionally a light stabilizer and carbon black are blended with a polyethylene resin. In addition to being excellent in rigidity or weather resistance, it also has a certain degree of flame retardancy, and can greatly shorten the construction period and is cheaper in construction costs than concrete.

The outdoor trough of the present invention is suitably used in the fields of civil engineering and construction and telecommunications.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing the shape of a lid and a trunk of a trough prepared according to an embodiment of the present invention.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Koide 1-1, Anesaki Beach, Ichihara City, Chiba Prefecture Idemitsu Oil Chemicals Co., Ltd. (56) References Japanese Utility Model No. 3-40827 (JP, U) Akira Miyuki 62-29243 (JP, Y2) Jiko 43-14584 (JP, Y1) Jiko 43-19 (JP, Y1) Jiko 50-15189 (JP, Y1) (58) Fields surveyed (Int. Cl. ⁶ , DB name) H02G 9/00-9/12

Claims (4)

(57) [Claims] An outdoor trough comprising a molding material comprising (B) 1 to 25 parts by weight of a halogen-based flame retardant and (C) 0.2 to 15 parts by weight of a metal oxide per 100 parts by weight of a polyethylene resin (A). . 2. (A) 100 parts by weight of polyethylene resin, (B) 1 to 25 parts by weight of halogen-based flame retardant, (C) 0.2 to 15 parts by weight of metal oxide, and (D) 0.001 to 3 parts of light stabilizer. An outdoor trough comprising a molding material containing 0.0001 to 3 parts by weight of carbon black. 3. The outdoor trough according to claim 1, wherein the halogen-based flame retardant is a bromine-containing flame retardant. 4. The outdoor trough according to claim 1, wherein the metal oxide is at least one selected from antimony oxide, titanium oxide and zinc oxide.