KR102578733B1 - Flame-retardant polyamide composition, method for preparing the same and method for preparing molding product containing the same - Google Patents

Abstract

The present invention relates to a flame-retardant polyamide resin composition, a method for producing the same, and a molded article containing the same, and more specifically, to a flame retardant polyamide resin composition, a method for producing the same, and a molded article containing the same. More specifically, the present invention relates to a flame-retardant polyamide resin composition, 50 to 75% by weight of polyamide resin, 5 to 30% by weight of glass fiber with a filament diameter of 10.6 to 11.9㎛, and phosphorus. A flame retardant polyamide resin composition comprising 13 to 20% by weight of a flame retardant, wherein the glass fibers are E-glass type ?h strands and the ?h length is 2 to 6 mm, It relates to manufacturing methods and molded products containing the same.
According to the present invention, tensile strength and impact strength are greatly improved by using specific glass fibers, and high-grade flame retardancy is provided by using eco-friendly flame retardants.

Description

Flame-retardant polyamide resin composition, method for manufacturing the same, and method for manufacturing molded articles containing the same {FLAME-RETARDANT POLYAMIDE COMPOSITION, METHOD FOR PREPARING THE SAME AND METHOD FOR PREPARING MOLDING PRODUCT CONTAINING THE SAME}

The present invention relates to a flame-retardant polyamide resin composition, a method of manufacturing the same, and a method of manufacturing a molded product containing the same. More specifically, the tensile strength and impact strength are greatly improved by using specific glass fibers, and the tensile strength and impact strength are greatly improved by using an eco-friendly flame retardant. It relates to a flame retardant polyamide resin composition that provides the effect of providing high-grade flame retardancy.

Aliphatic polyamides, such as nylon 6 and nylon 66, are used in many applications as engineering plastics because they have excellent heat resistance, chemical resistance, rigidity, wear resistance, and moldability. In the case of engineering plastics used in the electrical and electronic fields, additional glow-resistant wire characteristics are required in addition to flame retardant standards based on the UL 94 standard, and this can be seen as a way to prevent fires in advance by understanding more practical flame retardant behavior. there is. The flame retardant evaluation method based on the UL 94 standard is a method of simulating flame retardant behavior on the premise that a fire has already occurred by using a flame as a heat source, and the glow-resistant wire characteristic evaluation method based on the International Electrotechnical Commission (IEC) standard (Glow Wire) Flammability Index (GWFI) can be viewed as an advanced flame retardant testing method that considers safety in the event of a fire by providing a heat source that can cause a fire as a glow wire and identifying its behavior.

Halogen-based flame retardants used to provide flame retardancy to polyamide decompose due to a decrease in thermal stability due to the high temperature and pressure generated during processing, and as a result, corrosive and toxic gases are generated, which has a negative impact on the working environment and the human body. there is. Accordingly, non-halogen-based flame retardants, especially melamine-based flame retardants, are being replaced. However, melamine-based flame retardants have the advantage of being able to achieve flame retardancy with a lower content compared to halogen-based flame retardants, but when applied to resin reinforced with inorganic fillers, flame retardancy grade V- It is difficult to achieve 0, and mechanical properties such as tensile properties are deteriorated.

Accordingly, the polyamide resin is given a high level of flame retardancy that passes the GWFI measured at 960 ℃ according to the International Electrotechnical Commission (IEC) standard IEC 60695-2-12, and has excellent mechanical properties, especially high tensile properties. There is a need for research into technologies that can implement this.

Korean Patent Publication No. 2017-0023960

In order to solve the problems of the prior art as described above, the present invention is a flame-retardant polyamide resin that realizes flame retardancy using a phosphorus-based flame retardant, and E-glass type ?h strand (chopped strands) glass with a filament diameter of 10.6 to 11.9㎛. The purpose is to provide a flame-retardant polymide resin composition that combines fibers and has excellent flame retardancy as well as mechanical properties such as tensile strength and impact strength, a method of manufacturing the same, and a molded article containing the same.

The above and other objects of the present invention can all be achieved by the present invention described below.

In order to achieve the above object, the present invention includes 50 to 75% by weight of polyamide resin, 5 to 30% by weight of glass fiber with a filament diameter of 10.6 to 11.9㎛, and 13 to 20% by weight of a phosphorus-based flame retardant, wherein the glass fiber Provided is a flame-retardant polyamide resin composition with ?h strands of the E-glass type, characterized in that the ?h length is 2 to 6 mm.

In addition, the present invention includes the step of kneading and extruding 50 to 75% by weight of polyamide resin, 5 to 30% by weight of glass fibers with a filament diameter of 10.5 to 12 ㎛, and 13 to 20% by weight of a phosphorus-based flame retardant, wherein the glass fibers Provides a method for producing a flame-retardant polyamide resin composition, which is an E-glass type ?h strand (chopped strands), characterized in that the ?h length is 2 to 6 mm.

Additionally, the present invention provides a molded article comprising the flame-retardant polyamide resin composition.

According to the present invention, E-glass type ?h strands (chopped strands) glass fibers with a filament diameter of 10.6 to 11.9㎛ are mixed at a specific content ratio to a flame-retardant polyamide resin that implements flame retardancy using a phosphorus-based flame retardant to achieve UL94 V. It has the effect of providing a flame-retardant polyamide resin composition that secures a high level of flame retardancy of grade -1 or higher and has excellent mechanical properties, especially tensile strength and impact strength, a method of manufacturing the same, and a molded article containing the same.

The flame-retardant polyamide resin composition of the present invention includes 50 to 75% by weight of polyamide resin, 5 to 30% by weight of glass fiber, and 13 to 20% by weight of a phosphorus-based flame retardant, wherein the glass fiber has a filament diameter of 10.6 to 11.9㎛. In this case, it is possible to secure a high level of flame retardancy that passes GWFI and has excellent mechanical strength.

Hereinafter, the flame-retardant polyamide resin composition of the present invention will be described in detail for each component.

polyamide resin

For example, the polyamide may be included in an amount of 50 to 75% by weight or 56 to 65% by weight, preferably 56 to 61% by weight, based on the flame retardant polyamide resin composition, and within this range, mechanical properties, extrusion processability and appearance quality It has the advantage of excellent physical property balance.

The polyamide resin is a polymer having an amide bond (-NHCO-) in the main chain, and can be used as a ring-structured lactam or w-amino acid alone or as a condensation polymerization of two or more types.

The ring-structured lactam may be, for example, ε-caprolactam or ω-laurolactam, and the w-amino acid may be, for example, 6-aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, and para-amino acid. It may be one or more selected from the group consisting of methylbenzoic acid.

As another example, the polyamide resin may be a condensation polymerization of diacids and diamines.

Examples of the divalent acids include malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, 2-methyladipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethylglutaric acid, 3,3 -Diethylsuccinic acid, azelaic acid, sebacic acid, suberinic acid, dodecanoic acid, eicodioic acid, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid. , 5-sodium sulfoisophthalic acid, hexahydroterephthalic acid, diglycolic acid, etc., may be at least one selected from the group consisting of aliphatic, alicyclic, or aromatic dicarboxylic acids, and the diamine is, for example, tetramethylenediamine, hexamethylene. Diamine, 2-methylpentamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4-trimethylhexamethylenediamine, 2,4,4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, metaxylene Diamine, paraxylylenediamine, 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane , bis(4-aminocyclohexyl)methane, bis(3-methyl-4-aminocyclohexyl)methane, 2,2-bis(4-aminocyclohexyl)propane, bis(aminopropyl)piperazine, aminoethyl pipe It may be one or more types selected from the group consisting of aliphatic, alicyclic, or aromatic diamines such as razine.

For example, the polyamide resin may be one or more selected from the group consisting of nylon 6, nylon 66, nylon 610, nylon 1010, nylon 46, nylon 11, nylon 12, nylon MXD6, and polyphthalamide, preferably nylon 6. In this case, it has excellent heat resistance, chemical resistance, and mechanical properties.

The polyamide resin may be, for example, a semi-crystalline or amorphous polyamide resin, and is preferably semi-crystalline, in which case it has excellent chemical resistance, etc.

In this description, the semi-crystalline polyamide resin and the amorphous polyamide resin are not particularly limited as long as they are polyamide resins that are commonly recognized as semi-crystalline polyamide resin and amorphous polyamide resin, respectively, in the technical field to which the present invention pertains.

The polyamide resin may have a melting temperature of, for example, 150 to 350°C, 200 to 300°C, or 220 to 280°C, and has excellent heat resistance within this range.

The polyamide resin may have a relative viscosity (RV) of, for example, 1.5 to 5.0, 2 to 4, or 2.0 to 3.5, preferably 2.1 to 2.5, and has excellent moldability and processability within this range.

In this description, unless otherwise specified, relative viscosity can be measured at 20°C using a solution prepared by dissolving 1 g of polyamide in 100 ml of 96 wt% sulfuric acid aqueous solution.

The polyamide resin may have a number average molecular weight of, for example, 8,000 to 100,000 g/mol, 10,000 to 700,000 g/mol, 10,000 to 500,000 g/mol, or 10,000 to 50,000 g/mol, and the appearance of the final molded product within this range. It provides the advantage of improved properties, mechanical strength, etc.

The number average molecular weight of this substrate is a relative value to a standard PS (Standard polystyrene) sample using tetrahydrofuran (THF) as a solvent at a temperature of 40°C through gel chromatography (GPC) packed with porous silica as a column packing material. can be measured.

glass fiber

For example, the glass fiber may be included in an amount of 5 to 30% by weight or 15 to 30% by weight, preferably 20 to 25% by weight, based on the flame retardant polyamide resin composition, and within this range, the glass fiber has excellent surface appearance and tensile properties. It works.

For example, the glass fiber may have a filament diameter of 10.6 to 11.9 ㎛ or 10.6 to 11.5 ㎛, preferably 11.0 to 11.5 ㎛, and within this range, the tensile strength and impact strength are more excellent.

For example, the glass fiber may be E-glass type ?h strands (chopped strands).

In this substrate, the E-glass type conforms to ASTM D578-00, for example, 52 to 62% by weight silicon dioxide, 12 to 16% by weight aluminum oxide, 16 to 25% by weight calcium oxide, 0 to 10% by weight borax, 0 to 10% by weight. It consists of 5% by weight magnesium oxide, 0 to 2% alkali metal oxide, 0 to 1.5% titanium dioxide and 0 to 0.3% iron oxide. As another example, the E-glass type is 52 to 62% by weight silicon dioxide, 12 to 16% by weight aluminum oxide, 16 to 25% by weight calcium oxide, 0.1 to 10% by weight borax, 0.1 to 5% by weight magnesium oxide, 0.01 to 10% by weight. It consists of 2% by weight alkali metal oxide, 0.01 to 1.5% titanium dioxide and 0.001 to 0.3% iron oxide.

The glass fiber is, for example, characterized in that it is chopped strands with a chopped length of 2 to 6 mm or 3.0 to 4.5 mm, preferably 3.0 to 3.5 mm, and has a tensile strength within this range. and has superior impact strength.

The filament diameter and ?h length of the glass fiber were measured 30 times each using a SEM (Scanning Electron Microscope), and then the average value was calculated.

For example, the glass fiber may be surface-treated with a silane-based compound. In this case, it has excellent compatibility with the polyamide resin, so the glass fiber is evenly dispersed within the polyamide resin, and as a result, it has excellent mechanical and thermal properties and can be molded into an injection molded product. It has excellent surface properties.

The silane-based compound is not particularly limited in the case of amino silane, which is generally used as a coating agent for glass fiber, but examples include gamma-glycidoxypropyl triethoxy silane, gamma-glycidoxypropyl trimethoxy silane, and gamma-glycidoxypropyl triethoxy silane. Sidoxypropyl methyldiethoxy silane, gamma-glycidoxypropyl triethoxy silane, 3-mercaptopropyl trimethoxy silane, vinyltrimethoxysilane, vinyltriethoxy silane, gamma-methacryloxypropyl trimethoxy Silane, gamma-methacryloxy propyl triethoxy silane, gamma-aminopropyl trimethoxy silane, gamma-aminopropyl triethoxy silane, 3-isocyanato propyltriethoxy silane, gamma-acetoacetatepropyl trime It may be at least one selected from the group consisting of oxysilane, acetoacetate propyl triethoxy silane, gamma-cyanoacetyl trimethoxy silane, gamma-cyanoacetyl triethoxy silane and acetoxyaceto trimethoxy silane, In this case, the mechanical and thermal properties are excellent while the surface properties of the injection molded product are excellent.

For example, the glass fiber may be CPIC's ECS301HP-3-H (filament diameter 11㎛). In this case, it is readily available, and the quality or composition is confirmed and there is no change, so reproducibility is excellent. In particular, the tensile properties and composition of the composition are excellent. It has superior mechanical properties such as impact strength.

For example, the glass fiber may be characterized as having a limiting oxygen index (LOI) of 0.45 ± 0.1% by volume, and in this case, the composition has excellent physical properties such as tensile strength and impact strength.

The limiting oxygen index of the glass fiber is a value measured according to ISO 1887.

For example, the glass fiber may have a moisture content of 0.05% by weight or less, and in this case, the composition has excellent mechanical properties.

The moisture content of the glass fiber is measured according to ISO 3344.

For example, the glass fiber may be characterized as having a bulk density of 0.7 ± 0.1 g/cm ³ , and in this case, the product molding and physical property balance of the composition are excellent.

The bulk density of the glass fiber is measured according to ISO 15100.

For example, the glass fiber may be a fiber with a circular cross-section, in which case both the appearance quality and mechanical properties of the final product may be excellent.

phosphorus flame retardant

For example, the phosphorus-based flame retardant may be included in an amount of 13 to 20% by weight, or 15 to 20% by weight, preferably 15 to 19% by weight, based on the flame retardant polyamide resin composition, and within this range, it complies with the IEC 60695-2-12 standard. It passes GWFI measured at 960 ℃ and has excellent flame retardancy and mechanical properties.

For example, the phosphorus-based flame retardant may include one or more selected from the group consisting of phosphoric acid ester, phosphonate, phosphinate, phosphine oxide, and phosphazene.

In the flame retardant polyamide resin composition of the present invention, the weight ratio of the phosphorus-based flame retardant and the polyamide resin may be, for example, 1:3 to 1:5 or 1:3.5 to 1:4.5, and within this range, the tensile strength and impact strength There are further advantages such as:

Other additives

The flame-retardant polyamide resin composition of the present base may further include a flame-retardant auxiliary if necessary. The flame-retardant auxiliary may be, for example, magnesium hydroxide, aluminum hydroxide, or a mixture thereof. In this case, the flame retardancy is improved and the surface appearance is excellent. There is.

The magnesium hydroxide and/or aluminum hydroxide may be surface-treated with phosphorus, for example, and in this case, flame retardancy is improved and the surface appearance is excellent.

For example, the flame retardant auxiliary may be included in less than 3% by weight, or 0.01 to 3% by weight, based on the flame retardant polyamide resin composition. Within this range, there is an advantage in that the flame retardancy is excellent while the surface appearance and mechanical properties are high.

In addition, the flame-retardant polyamide resin composition of the present base may optionally be selected from the group consisting of lubricants, colorants, antistatic agents, plasticizers, heat stabilizers, antioxidants, light stabilizers, anti-dripping agents, pigments, and inorganic fillers (excluding glass fiber). It may include one or more selected types.

Flame retardant polyamide resin composition

The flame retardant polyamide resin composition of the present invention has, for example, a tensile strength (thickness of 40 mm, ASTM D638) of 148 MPa or more or 148 to 170 MPa, preferably 150 to 165 MPa, and a tensile elongation (thickness of 40 mm, ASTM D638) of 3.0% or more. 3.0 to 4.0%, flexural strength (thickness 40 mm, ASTM D790) is 7800 MPa or more or 7800 to 8200 MPa, preferably 8000 to 8200 MPa, and Charpy impact strength (thickness 40 mm, ASTM D256) is 12 kJ/m ² or more or 12 to 8200 MPa. It is 15kJ/m ² and the flame retardancy (UL 94 V TEST) is V-1 or higher, V-1 or VO, and within this range, it is effective in providing molded products with excellent flame retardancy and mechanical properties.

This disclosure provides a method for manufacturing the flame-retardant polyamide resin composition, and in describing this, descriptions that overlap with the above will be omitted. It is obvious that the content previously described in the flame-retardant polyamide resin composition is equally included in the method for producing the flame-retardant polyamide resin composition described later.

The method for producing the flame-retardant polyamide resin composition of the present invention includes, for example, 50 to 75% by weight of polyamide resin, 5 to 30% by weight of glass fiber with a filament diameter of 10.6 to 11.9㎛, and 13 to 20% by weight of phosphorus-based flame retardant, kneading and It may include the step of extruding, wherein the glass fibers are E-glass type ?h strands, and the ?h length is 2 to 6 mm. The composition prepared in this way may be It has the advantage of excellent flame retardancy and excellent mechanical properties.

The kneading and extruding steps include, for example, 200 to 280°C and 200 to 400 rpm; or 220 to 260° C. and 200 to 300 rpm; It may be performed under conditions, but is not limited thereto, and may be appropriately selected and performed within the range commonly practiced in the art.

The kneading and extrusion steps may be performed using, for example, a banbari mixer, a single-screw extruder, a twin-screw extruder, a kneader reactor, etc., and are not particularly limited.

The extrusion step is, for example, one selected from the group consisting of flame retardant auxiliaries, lubricants, colorants, antistatic agents, plasticizers, heat stabilizers, antioxidants, light stabilizers, anti-dripping agents, pigments, and inorganic fillers (excluding glass fiber) in addition to the ingredients described above. It may include more.

The flame-retardant polyamide resin composition manufactured according to the above manufacturing method can be provided as a molded product through injection molding.

The molded article according to the present invention is characterized in that it contains the flame-retardant polyamide resin composition.

The molded product may be, for example, a housing for an MCCB circuit breaker, a housing for an ACB circuit breaker, and a housing for an MCB circuit breaker.

Hereinafter, preferred embodiments are presented to aid understanding of the present invention. However, the following examples are merely illustrative of the present invention, and it is clear to those skilled in the art that various changes and modifications are possible within the scope and technical spirit of the present invention. It is natural that such variations and modifications fall within the scope of the attached patent claims.

The materials used in the following examples and comparative examples are as follows.

* Polyamide resin: Nylon 6 (melting temperature 250~270℃, relative viscosity 2.2~2.4, number average molecular weight 30,000g/mol)

* Phosphorus-based flame retardant: Clariant's OP1312 product or Solvay's PA2 product

* Glass fiber 1: A ?h strand glass fiber with a circular cross section, a filament diameter of 10㎛, and a ?h length of 3mm, CPIC's ECS301HP-3 (filament diameter 10㎛) was used.

* Glass fiber 2: A ?h strand glass fiber with a circular cross-section, a filament diameter of 11㎛, and a ?h length of 3mm, ECS301HP-3-H (filament diameter 11㎛) from CPIC was used.

* Glass fiber 3: A ?h strand glass fiber with a circular cross-section, a filament diameter of 13㎛, and a ?h length of 3mm, CPIC's ECS301HP (filament diameter 13㎛) was used.

[Example]

Examples 1 to 3 and Comparative Examples 1 to 4

After mixing with a mixer according to the ingredients and contents shown in Table 1 below, a flame-retardant polyamide resin composition was prepared by melt-kneading and extruding in a temperature range of 220 to 290 ° C. using a twin-screw extruder. After extrusion, it was pelletized using a pelletizer, dried at 120°C for more than 4 hours, injection molded, and left for more than 48 hours while blocking contact with air, and the physical properties were measured.

[Test example]

The properties of the specimens prepared in Examples 1 to 3 and Comparative Examples 1 to 4 were measured by the following method, and the results are shown in Table 1 below.

* Tensile strength (MPa) and tensile elongation (%)

Tensile strength and elongation at break were measured using a universal testing machine (UTM) according to ASTM D638. At this time, the thickness of the specimen was 40 mm and the tensile speed was measured at 5 mm/min.

* Flexural strength (MPa)

The flexural strength was measured under the condition of a span of 64 mm using a 40 mm thick specimen according to ASTM D790.

* Impact strength (kJ/m ² )

Charpy impact strength was measured using 40 mm thick specimens according to ASTM D256.

* Flame retardancy (UL 94 V TEST)

UL 94 requires that a specimen of a certain thickness be produced by injection molding, the specimen be placed vertically, and the specimen be ignited with a burner. The fire on the specimen should be extinguished on its own within a certain period of time. Here, depending on the degree to which the specimen is extinguished, V It was classified into grades -2, V-1, and V-0. Grade V-0 has the best flame retardancy.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 PA 56 61 61 56 70 57 56 flame retardant 19 15 19 19 10 23 19 Glass fiber 1 (diameter 10㎛) - - - 25 - - - Glass fiber 2 (diameter 11㎛) 25 25 20 - 20 25 - Glass fiber 3 (diameter 13㎛) - - - - - - 25 Physical property measurement results tensile strength 163 165 150 140 145 145 145 tensile elongation 3.3 3.0 3.5 2.8 3.0 2.8 3.0 flexural strength 8080 8200 7800 7700 7800 7600 7700 impact strength 12 14 14 10 12 12 10 Flame retardant V-0 V-1 V-0 V-0 V-1 V-0 V-0

As shown in Table 1, it can be seen that the flame retardant polyamide resin compositions of Examples 1 to 3 according to the present invention have excellent flame retardancy of grade V-1 or higher, and are excellent in tensile strength, tensile elongation, flexural strength, and impact strength. In particular, it can be seen that the tensile strength and impact strength are greatly improved compared to Comparative Examples 1 and 4 using different types of glass fibers than those of the Examples.

On the other hand, when the phosphorus-based flame retardant is applied in a small or excessive amount, the weight ratio of the phosphorus-based flame retardant and the polyamide resin is 1:7, which is outside the scope of the present invention (Comparative Example 2) and 1:2.5, which is outside the scope of the present invention (Comparative Example 3). It can be seen that the tensile strength drops significantly compared to the example, and the remaining physical properties also fall below the same level.

Claims (11)

Containing 56 to 61% by weight of polyamide resin, 20 to 25% by weight of glass fiber, and 15 to 19% by weight of phosphorus-based flame retardant,
The glass fibers are E-glass type ?h strands, with a ?h length of 2 to 6 mm, a filament diameter of 10.6 to 11.5 ㎛, and a circular cross-section.
Flame retardant polyamide resin composition. According to clause 1,
Characterized in that the phosphorus-based flame retardant and the polyamide resin are contained in a weight ratio of 1:3 to 1:5.
Flame retardant polyamide resin composition. According to clause 1,
The glass fiber is characterized in that the limiting oxygen index (LOI) is 0.45 ± 0.1% by volume.
Flame retardant polyamide resin composition. According to clause 1,
The glass fiber is characterized in that the moisture content is 0.05% by weight or less.
Flame retardant polyamide resin composition. According to clause 1,
The glass fiber is characterized in that the bulk density is 0.7 ± 0.1 g/cm ³
Flame retardant polyamide resin composition. delete According to clause 1,
The polyamide resin is characterized in that at least one selected from the group consisting of nylon 6, nylon 66, nylon 610, nylon 1010, nylon 46, nylon 11, nylon 12, nylon MXD6, and polyphthalamide.
Flame retardant polyamide resin composition. According to clause 1,
The flame retardant polyamide resin composition has a tensile strength (thickness of 40 mm, ASTM D638) of 148 MPa or more and a flame retardancy (UL 94 V TEST) of V-1 or more.
Flame retardant polyamide resin composition. Comprising the steps of mixing and extruding 56 to 61% by weight of polyamide resin, 20 to 25% by weight of glass fiber, and 15 to 19% by weight of phosphorus-based flame retardant,
The glass fibers are E-glass type ?h strands, with a ?h length of 2 to 6 mm, a filament diameter of 10.6 to 11.5 ㎛, and a circular cross-section.
Method for producing a flame retardant polyamide resin composition. Claims 1 to 5, and comprising the flame-retardant polyamide resin composition according to any one of claims 7 to 8.
Molded product. According to clause 10,
The molded product is characterized in that it is a housing for an MCCB circuit breaker, a housing for an ACB circuit breaker, and a housing for an MCB circuit breaker.
Molded product.