JPH08311327A - Thermoplastic resin composition for profile extrusion molding - Google Patents

Abstract

PURPOSE: To obtain a composition having light weight, excellent rigidity and impact strength, heat resistance and extrusion moldability, and suitable as a thermoplastic resin composition for deformed extrusion molding of building materials, especially window frames or door sashes, etc. CONSTITUTION: This thermoplastic resin composition for deformed extrusion molding is composed of (A1) 50-95wt.% a thermoplastic aromatic polycarbonate resin, (A2) 0-40wt.% a thermoplastic resin other than the thermoplastic aromatic polycarbonate resin, (B) 2-30wt.% polyethylene and (C) 5-30wt.% a filler.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a thermoplastic aromatic polycarbonate resin, or a thermoplastic resin containing a thermoplastic aromatic polycarbonate resin as a main component, polyethylene,
And a thermoplastic resin composition for profile extrusion comprising a filler, particularly rigidity, strength, heat resistance, impact resistance,
The present invention relates to a thermoplastic resin composition for profile extrusion, which is excellent in appearance, drawdown property, and swelling property.

[0002]

2. Description of the Related Art Aromatic polycarbonate resins have excellent mechanical strength, durability, and dimensional stability, and are used for electrical and electronic, O and
It is used in a wide range of fields including A, precision machinery, medical care, automobiles, sundries, and building materials. Aromatic polycarbonate resin is often molded by injection molding, and many materials suitable for injection molding are provided. On the other hand, in the field of building materials, it is required to obtain a complicated shape by profile extrusion, but there are many problems in applying aromatic polycarbonate to profile extrusion.

Aromatic polycarbonate resins have a strong temperature dependence of melt viscosity and a small melt strength (melt strength), so that they have drawbacks such as poor drawdown property or shapeability during profile extrusion molding. Have

High-viscosity aromatic polycarbonate resins and branched polycarbonate resins have been known to compensate for this drawback, but there is a limit to profile extruded products having a complicated shape.

When strength and rigidity are required for building materials, an appropriate amount of fillers such as inorganic fillers and glass fibers must be added in order to design the material to have a flexural modulus of elasticity of 50,000 kg / cm 2 or more. . As a result, the specific gravity increases, making it difficult to reduce the appearance and weight of the product.

[0006]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a thermoplastic resin composition for profile extrusion which overcomes the conventional drawbacks, is lightweight, has excellent rigidity, impact strength, heat resistance and extrusion processability. To do.

[0007]

SUMMARY OF THE INVENTION In view of the above-mentioned current situation, the inventors of the present invention have proposed a profile extrusion molding heat excellent in rigidity, strength, heat resistance, impact resistance, appearance, drawdown property and swelling property. As a result of diligent study to obtain a thermoplastic resin composition, a thermoplastic aromatic polycarbonate resin having excellent heat resistance and impact resistance, drawdown property, etc. Polyethylene excellent in moldability, filling for imparting rigidity and strength The inventors have found that the intended problem can be solved by mixing the materials in a predetermined ratio, and have reached the present invention.

That is, the gist of the present invention is (A1) 50 to 95% by weight of a thermoplastic aromatic polycarbonate resin,
2) Thermoplastic resin other than thermoplastic aromatic polycarbonate resin 0-40% by weight, (B) polyethylene 2-3
A thermoplastic resin composition for profile extrusion molding, which comprises 0% by weight and (C) a filler of 5 to 30% by weight. Hereinafter, the present invention will be described in detail.

The thermoplastic aromatic polycarbonate resin in the present invention is an optionally branched thermoplastic aromatic polycarbonate produced by reacting an aromatic dihydroxy compound or a small amount of this polyhydroxy compound with phosgene or carbonic acid diester. It is a polymer. An example of an aromatic dihydroxy compound is 2,2-bis (4-
Hydroxyphenyl) propane (= bisphenol A), tetramethylbisphenol A, tetrabromobisphenol A, bis (4-hydroxyphenyl) -P-
Diisopropylbenzene, hydroquinone, resorcinol, 4,4'-dihydroxydiphenyl, etc.,
Bisphenol A is particularly preferable.

To obtain a branched aromatic polycarbonate resin, chloroglycine, 4,6-dimethyl-
2,4,6-tri (4-hydroxyphenyl) heptene-2,4,6-dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 2,6-dimethyl-2,
4,6-tri (4-hydroxyphenyl) heptene-
3,4,6-Dimethyl-2,4,6-tri (4-hydroxyphenyl) heptane, 1,3,5-tri (4-hydroxyphenyl) benzene, 1,1,1-tri (4-) Polyhydroxy compounds exemplified by hydroxyphenyl) ethane, and 3,3-bis (4-hydroxyaryl) oxindole (= isatin bisphenol), 5-chloroisatin bisphenol, 5,7-dichlorluisa Tin bisphenol, 5-bromoisatin bisphenol and the like are partially replaced with the polyhydroxy compound, for example, 0.1 to 2 mol% of the dihydroxy compound.

Furthermore, monovalent aromatic hydroxy compounds suitable for controlling the molecular weight are m- and p-methylphenol, m- and p-propylphenol, p-bromophenol, p-tert-butylphenol and p-tert-butylphenol. -Long-chain alkyl-substituted phenols and the like are preferred. The aromatic polycarbonate resin is typically a bis (4-hydroxyphenyl) alkane compound, particularly bisphenol A.
The main raw material is a polycarbonate, a polycarbonate copolymer obtained by using two or more kinds of aromatic dihydroxy compounds together, and a branched polycarbonate obtained by using a small amount of a trivalent phenol compound together. . The aromatic polycarbonate resin may be used as a mixture of two or more kinds.

Examples of the thermoplastic resin other than the thermoplastic aromatic polycarbonate resin in the present invention include polyamide resin, acrylic resin, modified polyphenylene ether, polyacetal, polypropylene, polyvinyl chloride resin, styrene resin, aromatic polyester resin, liquid crystal polyester. Resin etc. are mentioned. The blending amount of the thermoplastic resin other than the thermoplastic aromatic polycarbonate resin is 0 to 40% by weight, preferably 0 to 30% by weight.

In order to lower the melt viscosity of the thermoplastic aromatic polycarbonate resin and lower the molding temperature, it is preferable to mix a styrene resin. Examples of styrene resins include GPPS, HIPS, ABS, AES, AAS, M
BS, SBR, SEBS, SEPS, etc. are mentioned. These styrenic resins can be used alone or in admixture of two or more, and the amount of the styrenic resin is preferably 50% by weight or less of the polycarbonate resin.

Further, in order to improve the chemical resistance of the polycarbonate, an aromatic polyester resin can be mixed. As the aromatic polyester resin, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polybutylene naphthalate,
A polyester obtained from an aromatic dicarboxylic acid such as polycyclohexane diterephthalate and a dialcohol can be given. One or two of these aromatic polyester resins
Although more than one species may be mixed with the polycarbonate for use, the blending amount of the aromatic polyester resin is preferably 50% by weight or less of the polycarbonate resin.

The polyethylene of the present invention has the effect of improving the moldability during extrusion molding. That is, the temperature dependence of the melt viscosity is improved as compared with polycarbonate alone, and the die swell ratio is increased to prevent drawdown and excellent in shapeability.

The polyethylene used in the present invention is obtained by the high pressure method,
Any polymerization process of the medium and low pressure method may be used,
Long-chain branched, short-chain branched, and straight-chain ones can be used. In addition, α-olefins (butene-1, hexene-1,
A copolymer with 4-methylpentene-1, octene-1) or the like can also be used. The polyethylene of the present invention has a melt index (MI) of 0.01 to 50 and a density of 0.88 to 0.
97 is used, but MI of 0.01 to 5 is particularly preferable.

The blending amount of polyethylene in the present invention is
It is 2 to 30% by weight. When the compounding amount is less than 2% by weight, drawdown of the resin occurs during profile extrusion, and the effect of improving the shapeability is small. Further, if the blending amount exceeds 30% by weight, heat resistance and mechanical strength are deteriorated, which is not preferable. The preferable range of the blending amount of polyethylene is 5 to
It is 20% by weight.

The filler in the present invention is glass fiber, glass flake, glass beads, carbon fiber, needle-shaped titanium oxide, potassium titanate whiskers, aluminum borate whiskers, zinc oxide whiskers, magnesium sulfate,
Calcium sulfate, wollastonite, clay, talc,
One or more selected from mica, silicon carbide and silicon nitride.

The glass fiber in the present invention is the average fiber 2
Chopped strands having a length of up to 30 μm, especially 3 to 10 mm, milled fibers having a length of 30 to 1000 μm, and roving type fibers can be used. Glass flakes have an average thickness of 0.1 to 50 μm and an average maximum length of 10 to 2
000 μm. The average particle size of the glass beads is 5 to 500 μm.

The carbon fibers are commercially available PAN type, pitch type chopped strands, roving strands,
Milled fibers having a diameter in the range of 1 to 30 μm are used. Further, as the carbon fiber, those treated with a coupling agent, an organic compound having an oxazoline ring, or other surface treatment agent can be preferably used, and those converged with polycarbonate are preferable.

The potassium titanate whiskers having an average fiber diameter of 0.1 to 2 μm and an average fiber length of 5 to 50 μm can be used. As the potassium titanate whiskers, those treated with a coupling agent or other surface treatment agent can be preferably used.

Aluminum borate whiskers having an average fiber diameter of 0.1 to 2 μm and an average fiber length of 5 to 50 μm can be used. Aluminum borate whiskers which have been treated with a coupling agent or other surface treatment agent can also be preferably used.

The amount of the filler added in the present invention is 5 to 30% by weight based on the total amount of the composition of the present invention. This addition amount is 5
If it is less than%, the dimensional stability (low shrinkage), strength or rigidity is poor, and the function as a filler-reinforced resin material is difficult to be exhibited. On the other hand, if it exceeds 30%, the fluidity becomes insufficient, extrusion molding becomes difficult, and the wear of the cylinder becomes severe, which is economically disadvantageous. The preferable range of the addition amount of the filler is 8 to 20% by weight.

As described above, the thermoplastic resin composition for profile extrusion of the present invention further comprises various additives such as UV absorbers, stabilizers, pigments, dyes, lubricants, etc., or organic fiber materials, if desired. A reinforcing material can be blended, and further, a resin component other than the above can be blended within a range not impairing the characteristics of the present invention.

In preparing the thermoplastic resin composition of the present invention, a conventionally known method may be adopted, and a method of kneading with an extruder, Banbury, mixer, roll or the like is appropriately selected.

[0026]

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited to the following examples unless it exceeds the gist thereof. In the examples, "%"
Indicates “% by weight”.

Examples 1 to 10 and Comparative Examples 1 to 4 Aromatic polycarbonate resin PC (a) made from bisphenol A as a raw material (Mitsubishi Gas Chemical Co., Ltd., trade name Iupilon E-2000; molecular weight 28, 000) and polyethylene (b1) (manufactured by Mitsubishi Chemical Corporation, trade name Mitsubishi Polyech HDHB310), polyethylene (b2) (manufactured by Mitsubishi Chemical Corporation, trade name Mitsubishi Polyech HD HB420)
R) or polyethylene (b3) (manufactured by Mitsubishi Chemical Corporation,
Trade name Mitsubishi Poly LD LD SF520) and chopped strand glass fiber (c1) (Nippon Electric Glass Co., Ltd., trade name ECS03T531DE fiber diameter 6μ
m), carbon fiber (c2) (manufactured by Toho Rayon Co., Ltd., trade name Besfight HTA-C6-CI), potassium titanate whiskers (c3) (manufactured by Otsuka Chemical Co., Ltd., trade name)
Tismo D) or aluminum borate whiskers (c4) (manufactured by Shikoku Chemicals Co., Ltd., trade name Arbolex) and ABS resin (d) (manufactured by Mitsubishi Rayon Co., Ltd., trade name Diapet ABS SE-3) Polyester resin (e) (manufactured by Japan Unipet Co., Ltd., polyethylene terephthalate, trade name Unipet RT-543C)
Were mixed in a tumbler at the ratios shown in Table-1 and extruded with a single-screw vent type extruder to form pellets, which were dried in a hot air dryer at 120 ° C for 5 hours or more, and then The product having the shape 1 was subjected to profile extrusion at a resin temperature of 260 ° C. Each physical property value was measured by cutting out a test piece from this profile extruded product. The results are shown in Table 1.

Flexural strength and flexural modulus are measured according to ASTM D
It was measured based on -790.

The die swell was obtained by cooling the resin extruded from the die in a free state, measuring the wall thickness of the upper surface portion of FIG. 1, and expressing the ratio with the wall thickness dimension of the die.

The drawdown property during extrusion was evaluated by the deformation of the central rib shown in FIG.

[0031]

[Table 1]

[0032]

EFFECTS OF THE INVENTION The thermoplastic resin composition for profile extrusion of the present invention overcomes the conventional drawbacks, is lightweight, has excellent rigidity and impact strength, has heat resistance and extrusion processability, and is a building material, especially a window frame, It is suitable as a thermoplastic resin composition for profile extrusion such as a door sash.

[0033]

[Brief description of drawings]

FIG. 1 shows a perspective view of a hollow test profile extruded product using the resin composition of the present invention.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI technical display location // (C08L 69/00 23:04 101: 00) (72) Inventor Goro Shimaoka East of Hiratsuka City, Kanagawa Prefecture 5-6-2 Yawata Sanryo Engineering Plastics Co., Ltd. Technical Center

Claims (4)

[Claims] 1. (A1) thermoplastic aromatic polycarbonate resin 50 to 95% by weight, (A2) thermoplastic resin other than thermoplastic aromatic polycarbonate resin 0 to 40% by weight, (B) polyethylene 2 to 30% by weight, And (C)
A thermoplastic resin composition for profile extrusion molding, which comprises 5 to 30% by weight of a filler. 2. The thermoplastic resin composition for profile extrusion molding according to claim 1, wherein the thermoplastic resin other than the thermoplastic aromatic polycarbonate resin (A2) is a styrene resin. 3. The thermoplastic resin composition for profile extrusion molding according to claim 1, wherein the thermoplastic resin (A2) other than the thermoplastic aromatic polycarbonate resin is an aromatic polyester resin. 4. The filler (C) is glass fiber, carbon fiber,
One or more selected from acicular titanium oxide, potassium titanate whiskers, aluminum borate whiskers, zinc oxide whiskers, magnesium sulfate, calcium sulfate, wollastonite, clay, talc, mica, silicon carbide, and silicon nitride. The thermoplastic resin composition for profile extrusion molding according to any one of claims 1 to 3, wherein: