JP3508448B2 - Polypropylene resin composition for profile extrusion molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to a large-scale building member and the like.
VariantSuitable polypropylene for extrusion moldingResin composition
objectAbout. [0002] 2. Description of the Related Art Polypropylene resins are inexpensive,
Due to its excellent physical and chemical properties, bumpers,
Instrument panel, steering wheel, etc.
Seed car parts, beer bottle case, soy sauce bottle case, cool
Various containers such as containers for drinking water and containers for collecting vegetables
Widely used for instruments, various audio housings, etc.
You. These molded products are mainly manufactured by injection molding
Use of polypropylene resin in the field of extrusion molding
Is due to the molding residual stress due to the crystallinity of polypropylene itself.
Release of distortion caused by deformation, twist, sink marks, etc. on molded products
Use in shape fields other than pipes and films
Is very little at present. [0003] Propylene-based resins include
Homopolymer, block copolymer, lander
There are various types such as copolymers and graft copolymers,
Generally, a random copolymer is required to have transparency or
A preferred lunch box and a costume box where the contents can be checked from the outside,
Cases and boxes such as tool boxes etc. are injection molded
Although it is used as a material for manufacturing, it is relatively large
It is not used for extrusion molding of building components. [0004] These problems in the extrusion molding field should be overcome.
And more research has been done than before, for example,
And residual stresses formed by mixing fillers such as calcium carbonate and calcium carbonate
Or ethylene-propylene copolymer rubber or
E. Ethylene-propylene-non-conjugated diene copolymer rubber
Adds lastomer to reduce crystallinity of polypropylene
Attempts have been made. However, such poly
Propylene compositions are too brittle and difficult to use in practice
With a title or too soft
There is a problem of poor thermal properties, in any case, the shape,
There remain problems such as insufficient improvement in dimensions and wall thickness.
Was. [0005] SUMMARY OF THE INVENTION The present inventor has set forth the above problems.
In view ofVariantExtruded products, especially large profile extruded products
ToPolypropylene that can be molded to desired shape, size, thickness, etc.
As a result of thorough examination of resin materials,Echile
NMade by random copolymerization ofAnd certain inorganic
Polypropylene resin composition comprising fillerUse
By doing so, we found that the above objectives could be achieved,
The invention has been completed. That is, the object of the present inventionIs differentform
Extruded and excels in accuracy of desired shape, size and thickness
Polypropylene from which molded products can be obtainedResin composition
To provide. [0006] SUMMARY OF THE INVENTION Accordingly, the gist of the present invention is as follows.
Where ethylene is a comonomer and is 2 to 8
%, The melt flow rate (MFR) is 0.1 to
Ethylene-propylene lander in the range of 3 g / 10 minutes
The average particle size is 0.7 to 8 μm per 100 parts by weight of the copolymer.
m, specific surface area 2700-32000cm²/ G of carbonic acid
Lucium, length 15μm or less, average particle size 1.5-6μ
m, talc having an aspect ratio of 5 or more, or an average particle size of 8 to
Mica with 100μm, aspect ratio 5 or moreAny of 1
seedExtrusion comprising 25 to 150 parts by weight of
It exists in the polypropylene resin composition for molding. [0007] DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail. The present invention
ofFor polypropylene-based resin compositionPolypropylene is
2 to 8% by weight of propyleneethyleneTo contain
Random copolymerization is required, and ethylene
The higher the content, the better the shape, dimensions and wall thickness accuracy. run
When the ethylene content of the dam copolymerized polypropylene is
If the amount exceeds%, the rigidity of the molded product is insufficient due to the decrease in the elastic modulus.
If less than 2% by weight, randomness is insufficient.
As a result, the shape and dimensions of the molded product deteriorate. [0008] The random copolymerized polypropylene is
Based on JIS K6758 (230 ° C, 2.16kg)
Melt flow rate (MFR) is 0.1-3 g /
It must be in the range of 10 minutes. Small MFR
The more complex and large shaped products are superior in moldability. M
If the FR exceeds 3 g / 10 minutes, the dimensions of the molded product deteriorate.
Or deformation tends to occur, while if it is less than 0.1,
Meltability in the extruder decreases, resulting in inhomogeneous molded products
And the strength decreases. The production of the random copolymerized polypropylene is as follows:
Gas phase weight using Ziegler catalyst or metallocene catalyst
In the case of bulk polymerization or slurry polymerization,
It is manufactured continuously or batchwise. The polymerization temperature is
The temperature is usually 50 to 100 ° C., and the polymerization time is appropriately set.
You. Also, the MFR of the polymer regulates the hydrogen concentration in the polymerization tank.
Is controlled by [0010] The present inventionPolypropylene resin compositionTo
Is the random copolymerized polypropylene described above,
Homopolymerized polypropylene or brass as long as the effect is not impaired.
Lock copolymerized polypropylene can be used in combination. The polypropylene resin composition of the present invention comprises:
A specific inorganic filler is added to the above random copolymerized polypropylene.
It is obtained by blending a filler. Specific inorganic filler
Is extruded from the extrusion die during extrusion.
Improved shape retention of molten polypropylene
The extrusion characteristics of molded products have been improved,
This has the effect of further improving the accuracy of thickness. As an inorganic filler
Calcium carbonate, talc or micaAny of
1 seedIs used. Calcium carbonateas,Average particle size 0.7
-8 m, specific surface area 2700-32000 cm²/ G
rangeAre used,Fatty acid, fatty acid
Treated with steal, resin acid, surfactant, coupling agent, etc.
Can be used. talcas,Length is real
It is qualitatively 15 μm or less and the average particle size is in the range of 1.5 to 6 μm.
Are in the box and have an aspect ratio of 5 or moreUsed
Be. Micaas,Average particle size is 8-100μ
m and an aspect ratio of 5 or moreUse
UsedAny of white mica, gold mica, black mica
May beNo. ThisHere, the average particle size refers to the laser light scattering
It is a value measured using a particle size distribution analyzer.
Used LA-500 type manufactured by Horiba, Ltd. Also, diameter
Is measured using a microscope to determine the aspect ratio.
Was. Inorganic filler random copolymerized polypropylene
The amount added to the copolymer is 100
25 parts by weight to 150 parts by weight per part by weight
Should be limited to 150 wt.
Exceeding the part, the surface of the extruded product becomes rough,
The impact strength of the molded product is reduced, and it is difficult to put it to practical use. Inorganic charge
FillerAppendageOf the present inventionPolypropylene resin set
AdultIs suitable for relatively small or small extruded products.
As the shape becomes larger and more complex, inorganic filling
Increased the amount of additivePolypropylene resin compositionNasu
Molding products with excellent shape, dimensions and wall thickness accuracy
Can be obtained. The present inventionPolypropylene resin compositionIs
For the purpose of improving extrudability and improving the performance of molded products,
Various additives are added within a range that does not impair the effects of the present invention.
I can do it. Various additives include, for example, antioxidants
Agent, ultraviolet absorber, antistatic agent, lubricant, flame retardant, dispersion
Agents, light stabilizers, colorants, and other elastomers.
I can do it. The present inventionPolypropylene resin compositionIs
Random copolymer polypropyleneAndMixture with inorganic filler
To,If necessary, compound the above various additives and extrude
Machine, twin-screw extruder, Banbury mixer, roll mill, etc.
Knead uniformly using a kneading machine, strand cut method,
Granulating by cut-cut method or sheet-cut method
It is thus prepared. And of the present inventionPolypropylene type
Resin compositionOf the above-mentioned granulated material or uniform ungranulated mixture
In the state, a single screw extrusion with an extrusion die of the desired shape
Extruders such as screw extruders, twin screw extruders and conical twin screw extruders
Supply toAnd differentExtrusion molding for building components and vehicles
Various molded products such as exterior members. [0017] Next, the present invention will be described.Polypropylene resin composition
Will be described in detail in Examples, but the present invention departs from the gist thereof.
The present invention is not limited to the following examples unless otherwise specified. What
OhPolypropylene resin compositionThe ingredients used for
As follows. [0018] [Table 1] (2) Block copolymer MFR 0.7g / 10min, ethylene content 5% by weight, melting
Temperature 161 ° C (3) Homopolymer MFR 0.6g / 10min, melting temperature 163 ° C The melting temperature was raised by DSC (differential scanning calorimetry).
At a rate of 10 ° C, the ethylene content of the copolymer
It was measured by spectral analysis. B inorganic filler Talc: average particle size 2.4 μm, average aspect ratio 6 Calcium carbonate: average particle size 1.80 μm, specific surface area 12
000cm^Two/ G Mica: white mica, average particle size 72 μm, average aspect
G ratio 45 C Other additives EPM (ethylene-propylene copolymer rubber): ethylene
Content: 74% by weight, MFR: 1.2 g / 10 min, density: 0.8
7g / cm^Three SEBS (styrene-ethylene-butylene-styrene)
Rock copolymer): Styrene content 15% by weight, MFR3
g / 10 min, density 0.90 g / cm^Three Embodiment 110, Comparative Examples 1 to 11 Table-1 and
A predetermined amount (parts by weight) of the above-mentioned components described in Table 2;
Resin temperature using a bi-directional twin screw extruder (diameter 65 mmφ)
Adjusting to 210 ± 5 ° C, kneading and granulating, extrusion molding
A polypropylene for use was prepared. This extrusion molding polypropylene
Use a 65mm φ screen for polypropylene
Equipped with a profile extrusion die on a single screw extruder equipped with a screw
And remove the sizer mold, cooling water tank, take-off machine, and cutting machine.
Are arranged in the order shown in FIG.
An extruded product having a thickness of 2 mm was extruded. Single screw extruder temperature
The degree setting is 200 ° C at the barrel tip and 210 ° at the extrusion die.
° C, and the extrusion speed was reduced at a linear speed of 2 m / min. The shape, thickness, and dimensions of the resulting shaped article
For each location shown in the perspective view of the heteroformed article of FIG.
An evaluation was performed. The results are shown in Table-3. Evaluation in the figure
Location, 1 is sink of molded product, 2 is side wall falling down, 3 is meat
The thickness, 4 were bent, and 5 was evaluated for the overall width dimension according to the following criteria.   In Table-3, ◎: extremely good ○: good --- Within the specified cross-sectional shape             △: Slightly poor ×: Poor ------ Outside the specified cross-sectional shape [0023] [Table 2] [0024] [Table 3] [0025] [Table 3] The present inventionPolypropylene resin compositionFor
The molded article was molded as shown in the examples.
They also have good shape, size and thickness, while the structure of the present invention
Comparative examples lacking composition are either shape, size, thickness, or both
Failed. [0027] According to the present invention,Polypropylene resin composition
Is2-8% by weight of ethylene and propylene
A copolymer having a specific MFR and a specific copolymer
Excellent shape, obtained by blending inorganic filler,
We can manufacture profile extrusion products with dimensions and wall thickness accuracy
SoEffective for molding architectural members and interior / exterior parts for vehicles
Used for [0028]

[Brief description of the drawings] Fig. 1 Cross-sectional view of an extruded product FIG. 2 is a perspective view of an extruded molded product. [Explanation of symbols] 1 Mold sink 2 Side wall collapse 3 wall thickness 4 bend 5 Full width dimensions

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-139441 (JP, A) JP-A-63-281945 (JP, A) JP-A-57-8235 (JP, A) JP-A-62 209152 (JP, A) JP-A-8-12825 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C08L 1/00-101/16 C08K 3/00-13/08

Claims (1)

(57) [Claim 1] 2 to 8% by weight of ethylene as a comonomer
Contains, melt flow rate (MFR) 0.1-3g
With respect to 100 parts by weight of the ethylene-propylene random copolymer in the range of / 10 minutes, the average particle size is 0.7 to 8 μm,
Calcium carbonate having a specific surface area of 2700 to 32000 cm ² / g, a length of 15 μm or less, an average particle size of 1.5 to 6 μm, and a talc having an aspect ratio of 5 or more, or an average particle size of 8 to 100
μm, any one of an aspect ratio of 5 or more of mica 2
A polypropylene resin composition for profile extrusion molding, which is contained in the range of 5 to 150 parts by weight.