JPS5927947A - Polycarbonate resin composition - Google Patents

Abstract

PURPOSE:To provide a resin compsn. which is suitable for use in the production of electrical appliance parts, has excellent moldability and gives moldings having excellent electrical conductivity, impact resistance, etc., by blending an unsaturated acid-modified polyolefin with a blend consisting of a polycarbonate and a carbon filler. CONSTITUTION:99-60wt% polycarbonate (A), 1-40wt% carbon filler (B) such as carbon fiber or carbon black and 0.1-40pts.wt. (per 100pts.wt. of combined amount of components A and B) unsaturated acid-modified polyolefin are mixed together to obtain the desired polycarbonate resin compsn. The unsaturated acid- modified polyolefin can be obtd. by reacting a polyolefin such as polyethylene or polypropylene with an unsaturated acid (anhydride) such as acrylic acid or maleic anhydride in the presence of a peroxide and, if necessary, in the presence of a liquid synthetic rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polycarbonate resin composition, and more particularly to a polycarbonate resin composition whose physical properties are improved by adding an unsaturated acid-modified polyolefin to a blend of polycarbonate and a carbon filler.

Polycarbonate resin has excellent strength, deployment impact properties, transparency, etc., so it is widely used as an engineering resin in various fields of rods.By the way, in order to improve the conductivity of polycarbonate resin, Various combinations of polycarbonate with carbon fiber or carbon black have been proposed.As a result, the electrical conductivity of polycarbonate has been improved, but the mechanical properties are significantly deteriorated due to the decomposition of polycarbonate during molding, making it difficult to use various materials in practice. A problem is occurring.

On the other hand, although adding carphone fiber or glass fiber to polycarbonate improves rigidity,
Because the impact resistance is significantly reduced, its applications are limited, making it difficult to use it for housings of optical equipment and power tools, home appliance parts such as insulating chassis and connectors, and industrial material parts for automobiles and the like.

The inventors of the present invention have conducted intensive research to solve the above-mentioned problems regarding polycarbonate, and as a result, they added unsaturated acid-modified polyolefin to a blend of polycarbonate and a carbon-based filler or a blend of glass fiber. They discovered that the object could be achieved by doing this, and based on this knowledge, they completed the present invention.

The present invention also includes a blend consisting of polycarbonate and a carbon-based filler (-< is a polycarbonate resin composition obtained by mixing an unsaturated acid-modified polyolefin with a blend further containing glass fibers).

In the polycarbonate resin composition of the present invention, the carbon filler d is used to improve the conductive box properties of polycarbonate, and carbon fiber or carbon black is used alone, but these two may be mixed in an appropriate ratio. use When used as a mixture, it is desirable to use carbon fibers in a ratio of 41) ik it 96 or more.

In addition, glass fiber is used as a component of the polycarbonate resin composition of the present invention in the second test, but when the composition is used for VCf applications requiring high rigidity, the glass fiber w is In addition, in the present invention, the unsaturated acidity 1<IE polyolefin is added in order to reduce the impact 1'J- of the polycarbonate resin composition.

Bo? L carbonate can be used as a substitute for the #method of Ren7sen, for example ←1: Pisphenol A.
The phosgene method in which phosgene is reacted with bisphenol A
Polycarbonate may be used alone or in combination of two or more types. Note that for applications requiring flame retardancy, it is desirable to use a copolymer of halogenated bisphenol. There are no particular restrictions on the molecular weight of the polycarbonate used, but it is usually 10,000.
~100,000 degrees are used, and 20,000~5
0000 is preferable - carbon fiber is a carbon-based filler, and rayon yarn, polyacrylonitrile, lignin poval, pitch, and carbon whiskers can all be used. Among these, rayon-based, polyacrylonitrile-based, and lignin poval-based materials are preferable because they have a large effect of improving conductivity and rigidity. Also,
Carphone black may be obtained by any method such as the furnace method or the impact method, such as Ketjen black and acetylene black. By adding carbon black, the dimensional stability and processability of the molded product are simultaneously improved.
The addition of carbon black is desirable for applications such as large injection molded products. Also, carbon whiskers can be used instead of carbon black. Next, glass fibers can be replaced with polycarbonate, as mentioned above.
1. Tree 11h' It is added when high rigidity is required for the composition, and any type of fiber can be used, but alkali-free glass fiber is preferable. Polyolefin stripes Polyolefins, especially polyethylene and polypropylene, are mixed with unsaturated carboxylic acids in a solvent or in a molten state in the presence of peroxide and, if necessary, with the addition of a liquid rubber containing a diene monomer as a main component.
or the unsaturated carboxylic acid used in this reaction, which may be obtained by reacting with the anhydride thereof.
-For example, there are acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, methaconic acid, ntraconic acid, crotonic acid, isocrotonic acid, angelic acid, etc., and these anhydrides are also Can be used similarly. In addition, the addition rate of unsaturated carboxylic acid and its anhydride in unsaturated acid-modified polyolefin is 0.1
~15 weight, Hakaze's weight is 0.5~10 weight 11 inch.

Regarding the blending ratio of each component in the polycarbonate resin composition of the present invention, in the first invention, polycarbonate is 99 to 60 years old, preferably 95 to 80 degrees, and 1 to 100 carbon fillers are used. 40 parts by weight, preferably 6-2
The amount of the unsaturated acid-modified polyolefin is 0.1 to 40 parts by weight, preferably 5 to 20 parts by weight, per 100 parts by weight of the compound. Here polycarbonate is 99
If the weight is on the windward side, the conductivity and rigidity of the resulting composition cannot be sufficiently improved.

On the other hand, if it is less than 60% by weight, the fluidity and impact strength of the composition will decrease and the appearance will be poor, which is not preferable. Well, if the amount of carbon thread filler is less than 1 weight,
The conductivity of the composition becomes poor, which is undesirable;
If it is above the heavy needle level, the polycarbonate will decompose and the mechanical properties will deteriorate, so this is preferable. (If the amount of the 8-unsaturated acid-modified polyolefin is less than 0.1 parts by weight and 11 parts, the desired effect will not be sufficiently achieved, and
J, 118 or more, the composition's ntij attack value suddenly increases (Attack (C low - T +, Ilf O L,
In the second invention, the blending proportions of polycarbonate and carbon filler are the same as in the first invention, and glass fibers are further added in a ratio of 1 to 40, preferably 1-<
is 5 to 20ΦFIqb7Jl] The unsaturated acid-modified polysilane resin obtained by cutting and kneading is obtained from these polycarbonates 1. 11 trigrams to carbon-based filling and gold side of glass fiber ('d100 car (
Against Shinto (), 1 to -40L%,', ifi part,
Preferably 5 to 20 J$ If the blended amount of glass fiber is less than 1 fold, the rigidity of the 6′ former Iy′ snout can be increased by 414 feet] 7 (・This improvement 11 If more than 401 (< jQ ratio) is added, the fluidity of the resulting composition decreases, and screw wear occurs during molding, resulting in poor performance.

[Polycarbonate of the present invention] Tree Jlrr composition' If necessary, other additives may be added, such as) 1) a retardant, t'
tlt, mold agent.

Oxidation 1υ) inhibitor 1(su, weather resistance imparting agent + ':ii 'l
'lc R) 11t1111, heat resistant agent.

A coloring agent, a plasticizer, a reinforcing agent, a surfactant, an inorganic filler, a lubrication agent, a nucleation agent, etc. can be added as appropriate.

The polycarbonate resin composition of the present invention is prepared by blending the above-mentioned components and using a conventional mixing method such as a tumbler, a ribbon blender, a high-speed mixer, a V-type blender, a kneader, etc.
The desired composition is obtained by kneading it using a pelletizer, etc. When producing molded products from this composition, injection molding or extrusion molding is used.

Although various molding methods such as pressure molding and 9-rotation molding can be applied, injection molding is suitable for manufacturing home appliances, automobile parts, and the like.

Unlike conventional polycarbonate thread compositions, the polycarbonate resin composition of the present invention suppresses decomposition of polycarbonate during molding, and has improved fluidity and excellent workability. Furthermore, according to the present invention, a polycarbonate resin composition which maintains the effect of improving the conductivity ratio of polycarbonate by incorporating a carbon-based filler and has improved impact resistance, rigidity, etc. Therefore, the polycarbonate resin composition of the present invention is extremely suitable for producing housings for optical instruments and power tools, as well as parts for home appliances, automobile parts, etc. Examples 1 to 13 The ingredients shown in Table 1 were mixed thoroughly using a twin-screw kneading extrusion mill, and kneaded 1. Dry the pellets with a pelletizer; φ, use a part of this plate to make 1llll of the molecule, and use the remaining pellets for injection molding.
! Create a test piece for strength sub-specification and a test piece for volume resistivity sub-shelf, and evaluate the physical properties of this test piece.
．． 7. Although the results shown in Table 1 were obtained, the experiment was carried out under the following conditions for the physical properties.

Qli? Tzod impact strength +y according to JISK6719 (measurement temperature 280℃, stress 16oKp/d): JIs K711 (volume resistivity: 1) Comparative example 1 according to ASTM D257
~12 Unsaturated [1] acid modified polyolefin is distributed in proportions f'l' l/Nakatsuno here or in proportions outside the scope of the present invention.
A test piece was prepared in the same manner as in Example 1.1 except for the above.

Table 2 shows the measurement results of the physical properties of this test piece.

■1　Carphone 7' Rack　Made by Axo!

Claims (1)

[Claims] J. Polycarbonate resin composition prepared by mixing unsaturated acid-modified polyolefin with a blend of polycarbonate and carbon filler 2. Polycarbonate 99-6
The composition according to claim 1, wherein 0.1 to 40 parts by weight of an unsaturated acid-modified polyolefin is mixed with 100 parts by weight of a blend consisting of 0MfL'A and a carbon filler of 1 to 40 parts by weight. . 3. The composition according to claim 1 or 2, wherein the carbon filler is carbon fiber and/or carbon black. 4. The composition comprising polycarbonate, carbon filler and glass fiber is unsaturated. A polycarbonate resin composition prepared by mixing acid-modified polyurethane and 3-v fins. 5. A blend consisting of polycarbonate 98-60%, carbon unfiller 1-40% carbon and glass fiber 1-40% 100% unsaturated acid-modified polyolefin in an amount of 0.1-40%. The composition according to item 4, wherein the carbon filler is carbon fiber and /'
! ! The composition according to claim 4 or 5, which is carbon black.