JPS61130367A - Outer shell of electric equipment - Google Patents

Abstract

PURPOSE:To provide an outer shell of class II electric equipment, which has excellent mechanical strength and resistance to tracking and heat, by molding a compsn. contg. an arom. polycarbonate, an acrylic elastomeric polymer and glass fiber. CONSTITUTION:5-70pts.wt. glass fiber having a diameter of 6-20mu and a length of 0.05-0.5mm and optionally additives such as filler, stabilizer, antioxidant, colorant, tc. are blended with 100pts.wt. compsn. consisting of 99.5-80wt% arom. polycarbonate having an average MW of 10,000-100,000 and 0.5-20pts.wt. acrylic elastomer. The mixture is melt-kneaded and molded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to the outer shell of electrical equipment, and more specifically to a glass fiber reinforced resin that has excellent electrical properties, particularly tracking resistance, as well as excellent mechanical strength and heat resistance. The outer shell of a class I electrical device consists of:

<Prior Art> The exterior of electrical equipment is generally required to have excellent mechanical strength, heat resistance, dimensional stability, and electrical properties, especially tracking resistance, although it depends on the intended use and environment. For example, in terms of mechanical strength, when an electrical device is in use, it will not crack or deform even if it is accidentally dropped or other hard materials, such as metals such as iron, are dropped on top of the device. is necessary. In order to prevent detailed damage due to contamination, it is necessary for the exterior of electrical equipment to have excellent tracking resistance. Especially electric drills, electric planers,
For the exterior of class electric equipment such as electric saws and electric grinders, the bending elastic modulus is 40, OO0kllf/- or more,
Tracking resistance (xg.

Publication 112) PTI 1
75 V or more is required.
Traditionally, these electrical appliances have been made of glass fiber reinforced BB resin, glass fiber reinforced polypropylene resin, glass fiber reinforced polystyrene resin, glass fiber reinforced polyamide resin, glass fiber reinforced polycarbonate resin, etc.

However, the above-mentioned glass fiber-reinforced polypropylene/resin or glass fiber-reinforced polystyrene resin has poor mechanical strength and heat resistance, so that the fields in which it can be used are limited.

Those made of glass fiber reinforced polyamide resin have mechanical strength,
Although it has good heat resistance, its dimensions change more easily than when WK is warmer, and its dimensional stability as an external shell is poor. Further, those made of glass fiber reinforced polycarbonate resin have good mechanical strength, heat resistance and dimensional stability, but have unstable tracking resistance.

<Objective of the Invention> The object of the present invention is to provide excellent tracking resistance and to
It has excellent mechanical strength and heat resistance, and is used to provide outer shells for electrical equipment.

<Structure of the Invention> The present invention relates to (A) aromatic polycarbonate) 99.5 to 8
0% by weight (B) Class ■ characterized by being molded by blending 5 to 70 parts by weight of glass fiber to 100 parts by weight of a composition consisting of 0.5 to 20% by weight of an acrylic elastic polymer. This is the exterior of electrical equipment.

Aromatic polycarbonate (A) used in the present invention
is the average molecule JIL 1 derived from dihydric phenol
0,000-100,000, preferably 15,00
Q~6 Q,000 polycarbonate, usually 2
Typical examples of 62-valent phenols produced by a solution method or a melting method using a phenol and a carbonate precursor include bis72/-[2F2-bis(4-human diphenol) boupan]; bis(4-human-xy7
enyl)methane, 1,1-his(4-hydoxyphenyl)ethane, 2,2-bis(4-hydroxy-3-methylphenyl)pusiban, and the like. Preferred dihydric phenols are bis(4-t-droxyphenyl)alkanes, especially bisphenols. Dihydric phenols can be used alone or in combination of two or more types.

Examples of the carbonate precursor include carbonylpallite, carbonate, and haloformate.

Representative examples include phosgene, diphenyl carbonate, dino-10 formate of divalent heptaenol, and mixtures thereof.

When producing aromatic polycarbonate, a suitable molecule m
Conditioners, branching agents, catalysts, etc. can also be used.

Acrylic elastic polymer (B) used in the present invention
is a copolymer with a copolymerizable monomer such as methacrylic ester, butadiene, styrene, or acrylonitrile containing acrylic ester as the main component. -ethylhexyl acrylate, n-butyl acrylate, etc.) 40-95% by weight and butadiene 5-40mff
1% and methyl methacrylate 0-30% by weight and 0.0
A mixed monomer consisting of 1 to 3% by weight of a crosslinking agent (for example, ethylene dimethacrylate, etc.) is emulsion polymerized, and a flocculant is added to this to obtain a crosslinked rubber with an average calibration diameter of OJ ~ 0.3μ. First, 20-80% by weight of styrene and 20-80% by weight of methyl methacrylate are added to a latex containing 50-80 parts by weight of a polymer.
50!1ffi% and acrinitrile O~60Jij1
% and im agent (e.g., ethylene dimethacrylate, divinylbenzene, etc.), 0.1 to 2 m [m%] after addition and polymerization of 10 to 40 parts by weight of monomer, crosslinking agent (e.g., ethylene dimethacrylate, divinylbenzene, etc.). etc.) 0.1
-4% by weight of alkyl methacrylates whose alkyl group has 1 to 4 carbon atoms (e.g. methyl methacrylate, etc.) 5 to 4% by weight
It is a multi-component resin obtained by further adding 25 parts by weight. A specific example of the acrylic elastomeric polymer mentioned above is one commercially available from Kureha Chemical Industry Co., Ltd. under the product name HI-Jin-15. Acrylic elastic polymer (B)
By adding , the tracking properties of polycarbonate are improved.

The glass fibers used in the present invention may be of any type as long as they can be used for common i+:U carbonates. The preferred glass fibers have a diameter of 6 to 20μ, and the length of the glass fibers in the molded product is 0. 05 to 0.5m.Glass fibers are surface treated with silane coupling agents, etc., in order to improve their compatibility with the resin, and handling precautions: Same as above, for the purpose of rustling, glass fibers are bundled with acrylic thread #greasy, urethane resin, etc. It may be processed.

The outer shell of the electrical equipment of the present invention can be obtained by mixing and molding the three components mentioned above. The mixing ratio is 5 to 80 parts by weight of aromatic polycarbonate, 0.5 to 20 parts by weight of acrylic elastic polymer, and 5 to 70 parts by weight of glass fiber. range.

If the risk of acrylic elasticity exceeds 20 layers, the mechanical strength of the outer shell of the electrical equipment will decrease, and the stability of 1-tracking performance will be low with 0.5 degrees of strength. Also glass fiber 5
If it is less than part by weight, the mechanical strength of the outer shell of electrical equipment will decrease,
If it exceeds 70 parts by weight, molding becomes difficult. In other words, electrical equipment molded from the composition in the above range has excellent tracking resistance when exposed to external scratches, and also has excellent mechanical strength, heat resistance, and dimensional stability (
is also excellent.

The electrical device outer shell of the present invention is obtained by mixing and molding the components of 3411 above.

Known methods can be applied to mixing and shaping. For example, the components of the above 34I [tumbler 1V@
The mixture is mixed in a mixer such as a grinder or a Nautamikiner, and then formed into pellets as they are, or passed through an extruder to form pellets at °C, and then molded by injection molding, extrusion molding, compression molding, or the like. Alternatively, the mixture of polycarbonate and acrylic elastic polymer may be supplied to a hopper of an extruder, and glass fibers may be supplied from the middle of the extruder for extrusion molding. In addition, various mixtures,
A molding procedure can be carried out.

In addition, fillers such as polyester, other resins such as polymethyl methacrylate, calcium carbonate, and silica may be used during mixing or molding within a range that does not impair the purpose of the present invention. stabilizer, antioxidant, one-color agent,
An ultraviolet absorber, a ring absorber, etc. may be used as fBa.

The outer shell of the electrical equipment of the present invention is a class ■ electric A! Examples include magnetic saws, electric drills, electric planers, and electric grinders.

<Effects of the Invention> The outer cover of the electrical equipment covered in this way has improved tracking resistance compared to the conventional outer cover of electrical equipment, and has improved mechanical gl.
It has excellent heat resistance and can withstand use as the outer shell of class FF electrical equipment.

<Examples> The present invention will be described in detail with reference to Examples. In addition, the tracking resistance is according to I'kJOPublication Yuki 112, and the flexural modulus is A8'1i-1)-790.
(Accordingly, 'C was measured.

Examples 1 to 3 Aromatic polycarbonate (Teijin Kagaku Co., Ltd. ■ Back: Panlite L-1250C front with PC inside) Acrylic bullet am combination (% Ha Kagaku Kogyo ■; llijin-15) and then glass powder
a (Nittobo 11 was mixed with a grinder in the proportion shown in #l composition in Table 1 & a 30 mφ vented extruder (Nakatani ■a)
; V8JC-30), cylinder temperature 300
It was extruded into pellets at ℃. This pellet was heated to 125°C.
After drying for 5 hours, use an injection molding machine (using a domestic electric saw with a cylinder temperature of 320°C and a metal wire temperature of 110°C) to form a cylindrical piece, and cut it with force. Ta1
Tracking resistance was measured using a test piece measuring 8 x 18 x 3.2 m. Also, under the same conditions, 6A x 12.7X127s
A bending test piece of m was formed and the bending elastic modulus was measured. Table out those results! Shown below.

Comparative Example 1 A similar molded article was obtained and measured in the same manner as in Example 1 except that the acrylic elastic polymer was omitted. The results are shown in Table-■.

Comparative Example 2 A similar molded article was obtained in the same manner as in Example 2 except that the glass fibers were removed, and measurements were taken.

View the results directly.

Procedure Ina Sei Oath January J, 1985

Claims (2)

[Claims] (1) 5 to 7 parts by weight of glass fiber to 100 parts by weight of a composition consisting of (A) 99.5 to 80% by weight of aromatic polycarport and (B) 0.5 to 20% by weight of acrylic elastic polymer.
Class I characterized by being molded with 0 parts by weight
I Outer shell of electrical equipment. (2) The outer shell of an electrical device according to claim 1, wherein the outer shell of the electrical device is a power tool outer shell.