JPH0880526A - Glass fiber reinforced polyolefin resin composition, manufacture thereof, and molded body formed thereby - Google Patents

Abstract

PURPOSE: To provide, easily and at comparatively low cost, a composition which heightens impact resisting strength without degrading much of flexural strength and tensile strength and provides a glass fiber reinforced PO resin moldability capable of developing a balanced strength, and a molded body having high function. CONSTITUTION: A chopped strand of a reinforcing glass fiber flux and an acid decomposed polyolefin resin powder are mixed air current so that the reinforcing glass fiber flux is opened. To the surface of the opened reinforcing glass fiber, the acid decomposed polyolefin resin, or a metal with the same or a metal compound are deposited, and the reinforcing glass fiber on which there are deposited is mixed in the polyolefin resin powder uniformly.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a glass fiber reinforced PO resin composition and a glass fiber reinforced PO resin composition having excellent surface properties and giving a molded article excellent in both mechanical properties, particularly impact properties and bending strength. Regarding the production method and a molded article using the composition, the resin composition should be effectively utilized as a raw material for various molded articles used in various fields such as interior / exterior parts of automobiles, home electric appliances, etc. You can

[0002]

2. Description of the Related Art Polyolefin (hereinafter abbreviated as PO) resins such as polyethylene and polypropylene are typical plastics because they have low specific gravity, excellent chemical stability and moldability, and are extremely inexpensive. It is widely used as one of the materials, and a fiber-reinforced PO-based resin obtained by compounding this with glass fiber has also been put to practical use in various fields.

However, it has been pointed out that the fiber-reinforced PO resin lacks impact resistance. This is because the PO-based resin is non-polar and has poor affinity with polar and hydrophilic glass fibers and the like, and as a measure for improving it, a polar group is grafted or copolymerized to the PO-based resin at an appropriate ratio. Attempts have been made to modify the polypropylene, graft-modify polypropylene with nylon, and the like. Among these, the method of using the PO-based resin constituting the matrix and the acid-modified PO-based resin together is the simplest and most effective method. It can be said (for example, JP-B-61-37299, JP-A-60-9).
No. 0239, No. 63-264651, No. 64-902
38, JP-A-1-240545).

However, in the prior arts other than JP-B-45-36421, the affinity between the PO resin and the glass fiber is improved, and the tensile strength, bending strength and bending elastic modulus are improved accordingly, but on the other hand The drawback is that the impact resistance decreases. That is, one of the reasons why the impact resistance is enhanced by the combination with the reinforcing fiber is that the energy absorption when the reinforcing fiber is pulled out from the matrix resin when the fiber-reinforced resin molded product is broken is considered. Therefore, when a PO-based resin whose affinity has been increased by adding an acid-modified PO-based resin or the like is combined with the glass fiber, the glass fiber is less likely to be pulled out from the matrix resin and the impact resistance is improved. On the contrary, it decreases.

Moreover, in this method, since the acid-modified PO-based resin is simply mixed with the reinforcing fibers and the PO-based resin, it is assumed that the acid-modified PO-based resin is evenly attached to the surface of all the reinforcing fibers. However, it is pointed out that many acid-modified PO-based resins are dispersed in the PO-based matrix without adhering to the surface of the glass fiber, and a modifying effect depending on the added amount cannot be obtained.

Further, as means for reducing the above-mentioned deterioration of impact resistance, for example, Japanese Patent Publication No. 63-35179.
JP-B-1-40854 and the like disclose a method of enhancing impact resistance as a composite material by blending an elastic material having excellent impact resistance such as synthetic rubber with a PO-based resin forming a matrix. Is proposed.

However, when an elastic material such as synthetic rubber is blended with a PO-based resin which is a matrix, the impact resistance itself is improved, but the bending strength and tensile strength most expected of the glass fiber reinforced PO-based resin are improved. There is a problem in that the characteristics are significantly reduced and the original required characteristics cannot be satisfied.

As an improvement method other than the above, Japanese Patent Publication No.
No. 36421 discloses a silane coupling agent and α,
The glass fiber is pre-coated with a reaction product of an acid-modified PO resin modified with β-ethylenically unsaturated carboxylic acid or an acid anhydride thereof, whereby the bonding integrity between the matrix resin and the glass fiber is improved. A method of enhancing is disclosed.

However, this method also basically aims to improve the physical properties by increasing the bonding force between the glass fiber and the matrix resin, and therefore the bending strength and the tensile strength are improved by improving the bonding integrity of the two. However, the same drawbacks as those of the above-mentioned prior art arise in that the glass fiber is less likely to be pulled out at the time of breaking and the impact resistance is poor. Moreover, when the silane coupling-treated glass fiber is used as the means for applying the modified PO-based resin to the glass fiber, the glass fiber is immersed in the modified PO-based resin that has been heated and melted, and the silane and the modified PO
The method of chemically reacting the base resin, when using the glass fiber which is not silane coupled, silane and modified P
A method of applying the reaction product obtained by chemically reacting the O-based resin to the glass fiber is adopted, but it takes a considerably long time to perform a sufficient chemical reaction in these steps, and the productivity is remarkably impaired.

Due to the rapid progress of industrial technology and the complication of social needs, the required properties for various materials tend to become more and more severe, and glass fiber reinforced PO-based resins also have excellent bending strength which is the original property. There is a need for establishment of a technique that can increase the impact strength without deteriorating the tensile strength and the tensile strength and can be provided at a relatively low cost.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and its purpose is to enhance impact resistance strength and balance without significantly lowering bending strength and tensile strength. The present invention aims to provide a glass fiber reinforced PO resin composition capable of exhibiting excellent strength characteristics and a high-performance molded product using the resin composition.

[0012]

A method for producing a glass fiber reinforced PO resin composition according to the present invention, which has been able to solve the above-mentioned problems, is a method for producing a chopped strand of a reinforcing glass fiber bundle and an acid-modified PO resin. By mixing the resin powder in an air stream, the bundle of reinforcing glass fibers is opened, and at the same time, the acid-modified PO-based resin is attached to the surface of the opened reinforcing glass fiber. The gist exists in uniformly mixing the adhered glass fiber for strengthening with the PO resin powder.

In carrying out the present invention described above,
Mixing in the above airflow is performed under heating conditions to melt and adhere the acid-modified PO-based resin to the surface of the opened glass fiber, or chopped strands of the reinforcing glass fiber bundle and the acid-modified PO-based resin powder It is effective to melt-adhere the acid-modified PO-based resin to the surface of the opened glass fiber by heating the mixture after mixing in the inside.

Further, the acid-modified PO-based resin is adhered to the surface of the opened reinforcing glass fiber, or after the acid-modified PO-based resin is adhered, a metal and / or a metal compound is further adhered to form a PO-based resin powder. A homogeneous mixture or a homogeneous mixture of glass fibers having an acid-modified PO-based resin adhered to the surface thereof and a PO-based resin powder containing a metal and / or a metal compound is used as described below. After heat-pressing, the formation of crystallized products having a trans-crystal structure is promoted at the interface between the glass fiber and the PO-based resin constituting the matrix, and a resin molded product with further improved performance is provided.

Therefore, the present invention is also characterized by the resin composition obtained by the above method and the molded product obtained by molding the resin composition. The structure of the molded product is acid-modified on the surface. The reinforcing glass fiber having the PO resin or the resin and the metal and / or the metal compound attached thereto is uniformly dispersed in the PO resin matrix, or the reinforcing glass fiber having the acid-modified PO resin attached to the surface is It has a gist in that a crystallized product having a trans crystal structure is uniformly dispersed in a PO resin matrix containing a metal and / or a metal compound, and a crystallized product having a trans crystal structure is present at the interface between the reinforcing glass fiber and the PO resin matrix. There is.

[0016]

As described above, the composition of the glass fiber reinforced PO resin composition according to the present invention is reinforced by mixing the chopped strands of the reinforcing glass fiber bundle and the acid-modified PO resin powder in an air stream. The glass fiber bundles for application are opened and acid-modified P is formed on the surface of the opened reinforcing glass fibers.
An O-based resin is adhered, and the glass-reinforcing fiber having the resin adhered to the surface is uniformly mixed with PO-based resin powder, and the mixing in the air stream is performed under heating conditions. Acid-modified PO resin powder is melted and adhered to
Alternatively, after mixing the chopped strands of the reinforcing glass fiber bundle with the acid-modified PO-based resin powder in an air stream,
By heating the mixture, the acid-modified PO-based resin is uniformly melted and adhered to the surface of the open-fiber glass fiber, thereby improving the affinity of the open-fiber glass fiber for the PO-based resin efficiently and efficiently. can do.

That is, when the above-mentioned method is adopted, the opening of the glass fiber bundle and the adhesion of the acid-modified PO-based resin to the surface of the opened glass fiber can be efficiently carried out at the same time, and the fibers are opened. Since the acid-modified PO-based resin is evenly attached to the surface of the thin glass fiber, mixing the surface-treated glass fiber treated in this way with the PO-based resin powder does not waste the acid-modified PO-based resin. All of the acid-modified PO-based resins used are effective in improving the affinity with the PO-based resin, and the glass fiber modification treatment with acid-modified PO is significantly simplified as compared with the conventional method. With
A high modifying effect can be obtained with a small amount of the acid-modified PO resin.

Glass fiber reinforced P obtained as described above
The reasons why the O-based resin composition exhibits excellent physical properties have not been clarified at present, but the above-mentioned modification of the glass fiber is carried out uniformly and uniformly. It is considered that the affinity between the open fiber glass and the PO-based resin is appropriately increased by the above, and a composite composition having excellent tensile strength and bending strength is provided. In particular, the inventors of the present invention have confirmed through experiments that the composition containing the surface-modified open fiber glass and the PO resin obtained as described above can be obtained by heating and pressing. A crystallized product with a trans crystal structure is formed at the interface between the glass fiber and the PO-based resin constituting the matrix in the molded product, and the presence of the crystallized product with the trans crystal structure allows the above physical properties to be exhibited in a better balance. It was confirmed that

When the acid-modified PO resin is attached to the surface of the opened glass fibers, if a metal and / or a metal compound is further attached at an arbitrary time, the opened glass modified by the metal and / or metal compound is added. A molded body obtained by heating and pressurizing a reinforced PO resin composition obtained by uniformly mixing fibers with a PO resin powder has a trans-crystal of the above-mentioned transcrystal by coexistence of the metal and / or the metal compound. Crystallization is further promoted. Further, for the same purpose, glass fiber having an acid-modified PO-based resin adhered to its surface is
Also in a molded article obtained by heat-press molding a reinforced PO resin composition obtained by uniformly mixing with a PO resin containing a metal and / or a metal compound, the coexistence of the metal and / or the metal compound Crystallization of the aforementioned trans crystal is promoted.

Therefore, the present invention is also characterized by a molded body obtained by heat-press molding the above resin composition, and the constitution thereof is an acid-modified PO-based resin on the surface or the resin and metal and The reinforcing glass fibers having the metal compound attached thereto are uniformly dispersed in the PO resin matrix, or the glass fibers having the acid-modified PO resin attached to the surface of the reinforcing glass fiber contain metal and / or a metal compound. It is characterized in that it is uniformly dispersed in the system resin matrix, and crystallized substances having a trans crystal structure are present at the interface between the reinforcing glass fiber and the PO system resin matrix.

That is, the trans-crystal structure means a crystal structure developed in the direction perpendicular to the fiber axis. In the present invention, the crystal of the PO-based resin constituting the matrix resin is glass on the surface of the opened glass fiber. It is generated in the direction perpendicular to the fiber axis, which enhances the integrity of the glass fiber and the matrix resin, and significantly increases the bending strength and tensile strength of the composite material.

By the way, the trans crystal structure itself is already known. For example, at the interface between a high elastic modulus carbon fiber or aramid fiber and a crystalline polymer, a crystallized product of such a trans crystal structure is produced to form fibers and a resin. It has been confirmed that the interlocking property is improved and the interfacial adhesive strength and other mechanical properties are enhanced.

Therefore, it is conceivable that the glass fiber reinforced PO resin molded article may be modified in its physical properties by crystallizing such a trans crystal structure. However, with glass fiber reinforced resin, for example, A. Lustiger et.
al; ANTEC'93 p2559-2565, J. Varga, J. Karger-Kocsis;
Composites Science and Technology, Vol.48 (1993) p19
As described in 1-198 etc., crystallized substances with a trans crystal structure will be generated unless tension is applied to the glass fiber or a method of strictly controlling the cooling rate during molding is adopted. It is thought that trans-crystals are not always generated reliably, even though the operation is complicated and strict control is required, and an example in which such an idea is effectively utilized practically Does not exist.

However, as described above, the surface-modified spread glass fiber to which the acid-modified PO resin is attached at the same time in the opening process of the glass fiber bundle or to which the metal and / or the metal compound is further attached is used. , A composition in which this is uniformly mixed with a PO-based resin, or a composition in which glass fibers to which an acid-modified PO-based resin has been attached in the opening step are uniformly mixed with a PO-based resin containing a metal and / or a metal compound. It was confirmed that, when used, a crystallized product with a trans crystal structure was formed at the interface even under cooling conditions in a very general molding process.

By the way, when the affinity between the glass fiber and the PO-based resin matrix is increased by the formation of the trans crystallized product as described above, the bending strength and the like are improved as described above, but the impact resistance is improved. It is possible that it will decrease. However, in the fiber-reinforced PO-based resin molded product of the present invention in which crystallized substances having a trans-crystal structure are present, such a decrease in impact strength is not observed, and very well-balanced mechanical properties are obtained.

The reason for this is considered as follows. That is, since the PO-based resin, which is a crystalline polymer, forms spherulites by the resin alone even in the portion where glass fiber does not exist, a new interface is formed between the trans crystallized product and the spherulite, and this portion is In addition to exerting the effect of dividing the progress of cracks when impact fracture occurs, in such a system, a new interface formed between the spherulite and the trans crystal in the matrix resin creates a surrounding trans crystal crystallization product. Every glass fiber pulls out and absorbs impact energy,
It is considered that the combination of these results in favorable improvement in impact strength.

The acid-modified PO resin used here is
A polyolefin acid-modified with an α, β-ethylenically unsaturated carboxylic acid such as maleic acid, fumaric acid, or acrylic acid, or an acid anhydride thereof, and a preferable acid modification amount is 5 to 100 mgKOH / g in terms of acid value. The average molecular weight is preferably 5,000 to 100,000, more preferably 1 to 80 mgKOH / g.
It is in the range of 50,000 to 50,000. Also,
When the glass fiber bundle is opened, the average particle diameter is 8 μm so that the glass fiber bundle is efficiently and uniformly attached to the surface.
It is preferable to use a resin having a thickness of not more than about, more preferably 1 to 6 μm.

The polyolefin in the acid-modified PO-based resin or the PO-based resin constituting the matrix is polyethylene, polypropylene or ethylene-
Examples include propylene copolymers, blends thereof, and blends obtained by blending a small amount of other polymers therein. Among them, highly crystalline polyethylene and polypropylene produce the most trans-crystal crystallization. It is preferable because it is easy.

Further, in order to effectively exert the trans-crystal crystallization accelerating effect by the adhesion of the acid-modified PO-based resin, the preferred adhesion amount of the acid-modified PO-based resin is 0.0001 to 0.001 to the glass fiber weight. 50% by weight,
The range is more preferably 0.1 to 20% by weight, the content of the acid-modified PO resin in the glass fiber reinforced PO resin composition is 0.00001 to 30% by weight, and more preferably 0.03 to 8% by weight. % Range.

The metal and / or metal compound is
The coexistence with the acid-modified PO-based resin has the effect of further promoting the crystallization of the trans crystal as described above. Specific examples thereof include alkali metals such as potassium and sodium, calcium, magnesium and the like. Alkaline earth metals, metals such as aluminum or hydroxides, oxides, carbonates, chlorides, nitrates, sulfates, carboxylates, phenolates and the like of these metals are exemplified, and among them, particularly preferred Are calcium and aluminum and their compounds. The preferable amount of these used is 0.0001 to 5% by weight, more preferably 0.1% by weight in the total amount of the glass fiber reinforced PO resin composition.
It is in the range of 001 to 0.1% by weight.

The glass fiber bundle for strengthening, which is the subject of the above surface modification, is homogeneous and excellent in the state that the finer filaments are bundled, the filaments are opened and dispersed in the PO resin matrix. In addition to exhibiting the effect, the obtained molded article is preferable because it has a high surface smoothness, and is most preferable in consideration of the uniform dispersibility in the matrix resin at the final stage and the molding workability. Is
200 to 40 filaments with a diameter of 8 to 20 μm
About 100 fibers, more preferably about 400 to 1200 fibers, are bundled, and the fiber length varies depending on the required characteristics of the final molded product, so it cannot be specified uniformly, but the openability and homogeneity due to air flow 1-5 considering mixing
It is desirable to use one having a diameter of about 0 mm, more preferably about 5 to 20 mm.

In carrying out the present invention, as reinforcing fibers other than the above-mentioned glass fibers, inorganic fibers such as carbon fibers, metal fibers, ceramic fibers, SiC whiskers, S ₃ N ₄ whiskers, etc., or polyester fibers, polyamide fibers are used. It is also possible to use an appropriate amount of organic synthetic fibers such as acrylic fiber and aramid fiber, as well as various kinds of natural fibers, and to reduce the weight by using an appropriate amount of crushed fibers of recycled paper recovered as recycled resources. It is also possible to reduce costs.

As a concrete method of mixing in an air stream,
For example, an airflow mixing device as shown in FIG. 1 is used. That is, in the air flow mixing using this device, the chopped strands of the glass fiber bundles and the acid-modified PO-based resin powder, and further, if necessary, from the plurality of hoppers 2a and 2b provided in the upper portion of the horizontal cylindrical container 1 are used. Metal and / or metal compound are separately or simultaneously supplied into the cylindrical container 1, and compressed gas (air or compressed nitrogen gas, inert gas, steam, etc.) is supplied from a nozzle 3 provided on the wall surface of the container 1. ) Is blown in and mixed, the chopped strands are opened, the acid-modified PO-based resin powder is mixed, and the resin powder is attached to the opened glass fiber surface in parallel.
The compressed gas is discharged to the outside through a filter (not shown). The opened glass fiber to which the acid-modified PO-based resin (further, metal and / or metal compound) is attached is the container 1
It may be taken out in batches from the discharge port provided at the appropriate place.
When the acid-modified PO-based resin is melted and adhered to the surface of the glass fiber, heated compressed gas may be blown in or the cylindrical container 1 may be heated by an arbitrary method.

While the long fiber strands of glass fiber are pre-opened by passing them through a roll, etc., acid-modified PO
These are attached to the glass fiber strands in advance by spraying the system resin powder and the metal and / or metal compound, and while cutting this into a suitable length with a cutter, it is fed into the air flow mixing device and opened. It is also possible to mix and attach. At this time, in order to more efficiently adhere the acid-modified PO-based resin powder to the glass fiber surface,
It is also effective to give an electric charge to the glass fiber, the acid-modified PO-based resin powder, or the like to electrostatically adhere them.

The mixing ratio of the PO-based resin constituting the matrix resin and the reinforcing glass fiber cannot be uniformly determined because it varies depending on the application and required characteristics, but if it is mentioned as a standard ratio, the fiber-reinforced resin The PO resin is in the range of 40 to 90% by weight, more preferably 60 to 70% by weight, and the glass fiber is 10 to 60% by weight, more preferably 30 to 40% by weight.

The essential constituents in the present invention are as described above, but in addition to these, other synthetic resins, inorganic fillers, antistatic agents, ultraviolet absorbers, plasticizers are also used within the range not impairing the features of the present invention. Of course, it is also possible to include an appropriate amount of a colorant, a pigment, a dye and the like.

There is no particular limitation on the kneading method or molding method using the constituent materials as described above, and the method may be carried out in accordance with the conventional glass fiber reinforced resin manufacturing method or molding method. The fiber-reinforced resin composition in the present invention is provided as a bulky mixture containing the glass fiber surface-treated as described above and a PO-based resin. The composition is compressed and the surface is heated. Then, the preform in the state of being covered by melting the PO-based resin in the surface layer is formed, or these are processed into pellets or rods, or formed into a plate or the like for secondary molding. It can be used for extrusion molding, injection molding, injection compression molding, compression molding and the like.

[0038]

EXAMPLES Next, examples of the present invention will be shown, but the present invention is not limited by the following examples, and may be carried out with appropriate modifications within a range compatible with the gist of the preceding and following description. Of course, it is possible, and all of them are included in the technical scope of the present invention.

Example 1 As the glass fiber, a chopped fiber having a diameter of 13 μm, a length of 13 mm, and a bundle of 1200 filaments, which was treated with an aminosilane, was used, and the chopped fiber was mixed by an air mixing method as shown in FIG. Mixing conditions: compressed air pressure: 2 kg / cm ² ) While opening the fibers, average molecular weight: 20,000, average particle size:
An acid-modified polypropylene of 30 μm and an acid value of 70 mgKOH / g was added and mixed, and 0.3% by weight of the acid-modified polypropylene powder was adhered to the surface of the opened glass fiber.

After the surface-treated open glass fiber and the highly crystalline polypropylene powder (average particle size: 500 μm) were uniformly mixed in a weight ratio of 30:70,
Heated and pressurized using a heating press device, 30 cm ^L x 30
cm ^W × 0.4 cm ^T , formed into a plate-like body, and cut out 10 test pieces from each of the X- and Y-axis directions of the formed body, and 3
A point bending test (JIS K 7055) and a notched Izod impact test (JIS K 7110-84) were performed to examine the physical properties thereof.

Comparative Example 1 The glass fiber (same as above) was used as it was without the surface treatment as described above so that the total amount thereof was 30 parts by weight, and the same acid as used in Example 1 was used. 70 parts by weight of highly crystalline polypropylene powder pulverized with 1% by weight of modified polypropylene and then pulverized was uniformly kneaded by an air mixing method, and thereafter, heat and pressure molding and a strength evaluation test were performed in the same manner as in Example 1 above. I did.

Example 2 As the glass fiber, a chopped fiber having a diameter of 13 μm, a length of 13 mm and a bundle of 1200 filaments, which was treated with an aminosilane, was used. The chopped fiber was opened in the same manner as in Example 1 above. However, the same acid-modified polypropylene powder (average molecular weight: 20,000, average particle size: 30 μm, acid value: 70 mgKOH /) used in Example 1 was used while hot air of 200 ° C. was used as mixing air). g) was added and mixed, and 0.3% by weight of acid-modified polypropylene powder was melted and adhered to the surface of the opened glass fiber. The surface-treated open glass fiber and the highly crystalline polypropylene powder were uniformly mixed in the same mixing ratio and method as in Example 1, followed by hot press molding and further physical property test.

Example 3 As the glass fiber, a chopped fiber having a diameter of 13 μm, a length of 13 mm and a bundle of 1200 filaments, which was treated with an aminosilane, was used. However, the same acid-modified polypropylene powder (average molecular weight: 20,000, average particle size: 30 μm, acid value: 70 mgKOH /) used in Example 1 was used while hot air of 200 ° C. was used as mixing air). g) was added and mixed, and 0.3% by weight of acid-modified polypropylene powder was melted and adhered to the surface of the opened glass fiber. The surface-treated open glass fiber and the highly crystalline polypropylene were uniformly mixed at a weight ratio of 50:50, and
The heat press molding and the physical property test were performed in exactly the same manner as in.

Example 4 As glass fiber, 100 g of chopped fiber having a diameter of 13 μm, a length of 13 mm and a bundle of 1200 filaments, which was treated with aminosilane, was opened by the air mixing method in the same manner as in Example 2, Acid-modified polypropylene powder (same as above) was added and mixed, and 0.3% by weight of acid-modified polypropylene powder was melted and adhered to the surface of the opened glass fiber, and calcium was added thereto in an amount of 0.005-0.01. The highly crystalline polypropylene powder contained in an amount of 30% by weight was uniformly mixed in a weight ratio of 30:70, and hot press molding was performed in the same manner as in Example 1 and a physical property test was performed.

The results of the physical property tests are collectively shown in Table 1. Comparing Examples 1 to 4 satisfying the requirements of the present invention with Comparative Example 1, the present invention is obtained in both bending strength and impact strength. It can be seen that the example is superior, and in particular, the example 3 of the present invention is very excellent in impact strength. Incidentally, FIG. 2 shows the results of observing the cross section of the test piece obtained in Example 3 above with a microscope and observing the condition of the interface between the matrix resin and the glass fiber, as shown in this photograph. In addition, the formation of trans-crystallized crystallized substances was observed at the interface, and it can be seen that these have an excellent effect on the bending strength and impact properties.

[0046]

[Table 1]

[0047]

EFFECT OF THE INVENTION The present invention is constituted as described above, and glass fiber reinforced PO capable of exhibiting balanced strength characteristics while enhancing impact strength without significantly lowering bending strength and tensile strength. It has become possible to easily and relatively inexpensively provide a composition giving a resin moldability and a high-performance molded article.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view illustrating a method of opening and mixing in an air stream and a method of mixing and adhering an acid-modified PO-based resin and a nucleating agent, which are adopted in the present invention.

2 is a drawing-substitute micrograph showing the crystallization state of trans crystals in the molded product of the present invention obtained in Example 3. FIG.

Continuation of front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location // B29K 23:00 105: 08 C08L 23:00 (72) Inventor Takako Takeda 1 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo 5-5-5 Kobe Steel Co., Ltd., Kobe Research Institute (72) Inventor Takeki Otsuka 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Kobe Steel Co., Ltd. Kobe Research Laboratory (72) Invention Mika Anzai 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Works, Ltd. Kobe Research Institute

Claims (9)

[Claims] 1. A chopped strand of a reinforcing glass fiber bundle and an acid-modified polyolefin-based resin powder are mixed in an air stream to open the reinforcing glass fiber bundle and to open the fiber. Glass fiber reinforced polyolefin resin composition characterized in that an acid-modified polyolefin resin is adhered to the surface of the glass fiber for use and the reinforcing glass fiber having the resin adhered to the surface is uniformly mixed with the polyolefin resin powder. How to make things. 2. Mixing in an air stream under heating conditions,
The method for producing a glass fiber-reinforced polyolefin resin composition according to claim 1, wherein the acid-modified polyolefin resin is melt-adhered to the surface of the opened glass fiber. 3. A chopped strand of a reinforcing glass fiber bundle and the acid-modified polyolefin resin powder are mixed in an air stream, and then the mixture is heated to acid-modified the surface of the opened glass fiber. The method for producing a glass fiber reinforced polyolefin resin composition according to claim 1, wherein the prepared polyolefin resin is melted and adhered. 4. On the surface of the opened reinforcing glass fiber,
A polyolefin-based resin acid-modified by the method according to any one of claims 1 to 3 is adhered, or after being adhered, a metal and / or a metal compound is further adhered, which is uniformly mixed with the polyolefin-based resin powder. A method for producing a glass fiber-reinforced polyolefin-based resin composition, which comprises mixing with 5. The surface of the opened reinforcing glass fiber,
A glass fiber reinforced polyolefin resin, characterized in that the polyolefin resin is adhered by the method according to any one of claims 1 to 3 and then uniformly mixed with a polyolefin resin powder containing a metal and / or a metal compound. Method of making the composition. 6. A glass fiber obtained by the method according to any one of claims 1 to 3 in which acid-modified polyolefin resin is adhered to the surface of the glass fiber, and the polyolefin resin powder is uniformly mixed. A certain glass fiber reinforced polyolefin resin composition. 7. A surface-modified polyolefin resin obtained by the method according to claim 4, glass fibers having a metal and / or a metal compound attached thereto, and a polyolefin resin powder are uniformly mixed. A glass fiber reinforced polyolefin-based resin composition which is a product. 8. The glass fiber obtained by the method according to claim 5 and having an acid-modified polyolefin resin attached to the surface thereof, and a polyolefin resin powder containing a metal and / or a metal compound are uniformly mixed. A glass fiber reinforced polyolefin-based resin composition which is a product. 9. A resin composition according to any one of claims 6 to 8 is formed by heating under pressure, and a crystallized product having a trans crystal structure is present at the interface between the reinforcing glass fiber and the polyolefin resin matrix. A glass fiber-reinforced polyolefin-based resin molded article characterized by being.