JP2005187737A - Roving for long fiber-reinforced polyolefin resin and resin molding material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roving for a long fiber-reinforced polyolefin resin which can suppress an impregnated resin from getting fluffy and provide a molded product with excellent appearance and mechanical strength, and a resin molding material using the same. <P>SOLUTION: The roving for a long fiber-reinforced polyolefin resin is used as a reinforcing fiber for a long fiber-reinforced polyolefin resin molded product, and is a roving in which a sizing agent is adhered to a plurality of glass fibers, wherein the sizing agent comprises a silane coupling agent, a polyolefin resin and a polyethylene wax, and has preferably a polyethylene wax content of 1-20% by mass relative to the total solid of the sizing agent, the polyethylene wax having a softening point of 110°C or higher as measured by the ring and ball method and preferably an average particle size of 0.1-3.0 μm. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a roving made of glass fiber and a resin molding material using the same to obtain a long fiber reinforced polyolefin resin molded article having excellent mechanical strength.

  Conventionally, various long fiber reinforced polyolefin resin molding materials have been proposed for the purpose of improving mechanical properties, particularly impact resistance and heat resistance, of thermoplastic resin molded products reinforced with glass fibers.

  For example, in Patent Document 1 below, a continuous process is performed using a low-viscosity polypropylene resin as a raw material, mainly for the purpose of improving the impregnation property of a thermoplastic resin into a glass fiber bundle and not causing voids between single glass fibers. It is disclosed that the impregnation property of the resin into the glass fiber bundle is improved, and the glass fiber bundle introduced into the impregnation die is brought into contact with a protrusion or a roller provided in the impregnation die and applied with tension. It is disclosed that the glass fiber bundle is opened to improve the impregnation property of the thermoplastic resin into the glass fiber bundle.

Patent Document 2 listed below discloses a low-level nonionic and cationic surfactant for glass fiber bundling agents with respect to the generation of fluff in winding of glass fiber bundles and pulling out from wound bodies. It is disclosed that the generation of fuzz and the like is improved by adding the additive.
Japanese Patent Publication No. 63-37694 Japanese translation of PCT publication No. 2002-528661

  However, in the method of Patent Document 1 described above, the glass fiber bundle sizing agent is not considered, so that when the glass fiber bundle is pulled out from the glass fiber wound body, a pulling tension as a so-called back tension is applied. As a result, tangling and fluffing are likely to occur. This entanglement and fluffing of the yarn clogs the nozzle of the impregnation die and the fiber guide before the impregnation die, thereby causing a problem that the yarn is broken and the productivity and workability are lowered.

  Further, even when a surfactant as described in Patent Document 2 is added to the sizing agent, the above-described back tension does not sufficiently prevent the occurrence of yarn entanglement and fluffing, and yarn breakage also occurs. Thus, there has been a problem that productivity and workability are lowered.

  Further, in order to impregnate the continuous fiber bundle with the thermoplastic resin, the glass fiber bundle introduced into the impregnation die may be brought into contact with a protrusion or a roller provided inside the impregnation die to open the glass fiber bundle. However, if the spreadability is insufficient, the impregnation with the resin is inferior in the part where the glass fibers remain in a bundle, and the resulting molded product has poor appearance, poor strength, and cracks. There was a problem.

  Furthermore, when a polypropylene resin is used as the glass fiber sizing agent, the familiarity between the polypropylene resin sizing agent and the surfactant is particularly good, which results in poor yarn separation from the wound body, increasing back tension. Cheap. As a result, yarn tangling and fluffing are likely to occur, and there are also problems such as poor opening performance at low loads and poor opening uniformity.

  Therefore, in view of the above problems, the object of the present invention is to prevent the fiber fibers from being entangled or fluffed when the long fiber reinforced polyolefin resin molding material is produced by impregnating the resin with the roving, and the fiber opening property Another object of the present invention is to provide a long fiber reinforced polyolefin resin roving and a resin molding material using the same, which are excellent in the appearance and mechanical strength of the resulting molded product.

  That is, the roving for long fiber reinforced polyolefin resin of the present invention is a roving used as a reinforcing fiber of a long fiber reinforced polyolefin resin molded product, wherein a sizing agent is attached to a plurality of glass fibers, and the sizing agent is a silane. It contains a coupling agent, a polyolefin resin, and polyethylene wax.

  According to the roving for long fiber reinforced polyolefin resin of the present invention, the sizing agent contains polyethylene wax. This polyethylene wax has a particle diameter controlled within a certain range as compared with a sizing agent using a conventional surfactant. For this reason, since these particles are uniformly present in the glass fiber bundle, the yarn separation from the wound body wound up with the roving becomes good, and the glass fiber is applied by an external force received from a projection or a roller for opening the fiber. The bundle can be spread more uniformly. Therefore, generation | occurrence | production of fluff can be prevented and sufficient opening property can be obtained.

  In this invention, it is preferable that the softening point of the said polyethylene wax is 110 degreeC or more in a ring and ball method softening point. According to this aspect, when the ring and ball method softening point is 110 ° C. or higher, the effect of improving the yarn separation property and the fiber opening property of the strand from the wound body is brought about.

  Moreover, in this invention, it is preferable that the average particle diameter of the said polyethylene wax is 0.1-3.0 micrometers. According to this aspect, by setting the average particle diameter of the polyethylene wax to 0.1 μm or more, the particles are uniformly present in the glass fiber bundle, so that the external force received from the protrusions or rollers for opening the fiber The glass fiber bundle can be opened more uniformly. Moreover, by setting it as 3.0 micrometers or less, the fall of workability | operativity by the deterioration of convergence can be prevented.

  Furthermore, in this invention, it is preferable that content of the said polyethylene wax in the said sizing agent is 1-20 mass% with respect to the total solid content mass of the said sizing agent. According to this aspect, the glass fiber bundle is sufficiently opened, and the appearance and strength are not deteriorated, and workability is not deteriorated due to a decrease in take-up tension.

  On the other hand, the long fiber reinforced polyolefin resin molding material of the present invention is obtained by impregnating or applying a matrix resin composed of a polyolefin resin to the roving for the long fiber reinforced polyolefin resin, and a sizing agent adheres to the matrix resin. The glass fibers thus formed have substantially the same length and are arranged in parallel in the same direction.

  According to this long fiber reinforced polyolefin resin molding material, the glass fiber contained is not entangled or fluffed and is impregnated with the polyolefin resin in a sufficiently opened state, and thus obtained. Excellent appearance and mechanical strength of the molded product.

  According to the present invention, when producing a long fiber reinforced polyolefin resin molding material, the fiber fibers are not tangled or fuzzed, and the fiber opening is excellent. An impregnated long fiber reinforced polyolefin resin molding material can be obtained, and by using such a molding material, a resin molded product excellent in appearance and mechanical strength can be obtained.

  Hereinafter, the present invention will be described in detail. The present invention is characterized in that a sizing agent containing a silane coupling agent, a polyolefin resin, and polyethylene wax is used as a roving sizing agent.

  The polyolefin resin used for the sizing agent is not particularly limited, but an acid-modified polypropylene resin is preferably used. The acid-modified polypropylene resin can be converted into a sulfone group after chlorsulfonating the polypropylene resin, or directly sulfonated, or copolymerized with a polymerizable unsaturated carboxylic acid compound or derivative thereof at the time of production of the polypropylene resin. Furthermore, it can be obtained by a method such as graft polymerization of an addition polymerizable unsaturated carboxylic acid compound or a derivative thereof to a polypropylene resin.

  In addition, as the polypropylene resin, any one selected from a homopolymer of polypropylene or a copolymer of two or more types of polypropylene can be used. Specific examples thereof include, for example, polypropylene, polymethylpentene, and ethylene. -Propylene random copolymer, ethylene-propylene block copolymer, ethylene-α-propylene copolymer, propylene-α-propylene copolymer, and the like.

  Preferred examples of the sulfonated polypropylene resins include those obtained by reacting chlorine and sulfur dioxide or chlorosulfonic acid with the polypropylene resin as described above to convert it into a sulfonic group, and directly sulfonated polypropylene resins. Can be mentioned. More preferred are sulfonated polyethylene and sulfonated polypropylene.

  Examples of acid-modified polypropylene resins modified with unsaturated carboxylic acid compounds or derivatives thereof include polypropylene homopolymers or copolymers of two or more polypropylenes, for example, unsaturated carboxylic acids such as those exemplified above as polypropylene resins. A polymer obtained by graft polymerization of an acid compound or a derivative thereof, one or two or more monomers selected from polypropylene and one or more selected from an unsaturated carboxylic acid compound or a derivative thereof are randomly or block-copolymerized. Polymerized products and those obtained by graft polymerization of unsaturated carboxylic acids or derivatives thereof may be mentioned.

  Here, examples of the unsaturated carboxylic acid used for carboxylic acid modification include maleic acid, fumaric acid, itaconic acid, acrylic acid, and methacrylic acid. In addition, examples of unsaturated carboxylic acid derivatives include anhydrides, esters, amides, imides, and metal salts of these acids. Specific examples thereof include maleic anhydride, itaconic anhydride, methyl acrylate, and ethyl acrylate. , Butyl acrylate, glycidyl acrylate, methyl methacrylate, ethyl methacrylate, glycidyl methacrylate, maleic acid monoethyl ester, maleic acid diethyl ester, fumaric acid monomethyl ester, fumaric acid dimethyl ester, acrylamide, methacrylamide, maleic acid monoamide Maleic acid diamide, fumaric acid monoamide, maleimide, N-butylmaleimide, sodium methacrylate and the like. Among these compounds, those having no free carboxylic acid group generate a carboxylic acid group by hydrolysis or the like after polymerization.

  Of the unsaturated carboxylic acid compounds and derivatives thereof, preferred are glycidyl esters of acrylic acid and methacrylic acid and maleic anhydride. Preferred acid-modified polypropylene resins modified by these are ethylene and / or propylene. Copolymerized with polyolefin resin as the main resin structural unit modified by graft polymerization of maleic anhydride, polypropylene mainly composed of ethylene and / or propylene, and (meth) acrylic acid glycidyl ester or maleic anhydride. And acid-modified.

  The acid-modified polypropylene resin preferably has a weight average molecular weight of 5,000 or more, more preferably a weight average molecular weight of 10,000 or more, and a weight average molecular weight of 15,000 to 50,000. Most preferred. When the weight average molecular weight is less than 5,000, the converging property of the glass fiber is lowered, so that the workability is insufficient.

  Next, the silane coupling agent is not particularly limited as long as it has an amino group, but the amino group of the aminosilane is preferably a primary and / or secondary amino group, and more preferably γ-aminopropyl. Triethoxysilane, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl) -N′-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, γ- Aminosilanes such as anilinopropyltrimethoxysilane are preferred.

  Aminosilane is considered to have a particularly high reactivity with the acid-modified polypolypropylene in the sizing agent, and is preferable in terms of improving the sizing property of the fiber, improving the adhesion to the resin, and being excellent in mechanical strength. Further, it is more preferable to use γ-aminopropyltriethoxysilane because the color tone of the molded product is good.

  The silane coupling agent is used in an amount of 5 to 50% by mass, more preferably 10 to 35% by mass, based on the total mass of the solid content of the sizing agent. If the amount of the silane coupling agent used is too low, the bonding between the fiber and the sizing agent and the adhesion between the treated fiber and the matrix resin will be insufficient. Since the resin composition obtained in the above is yellowed, it is not preferable.

  Next, polyethylene wax will be described. The polyethylene wax contained in the sizing agent used in the present invention is an ethylene low polymer having a number average molecular weight of 500 to 10,000, more preferably 1000 to 5,000. If the value is less than 500, the physical properties of the polyethylene resin itself are low, so that the physical properties of the resulting resin composition are inferior, and if it exceeds 10,000, the amount of fluff generated increases, resulting in poor workability.

  Further, the softening point of the polyethylene wax is preferably 110 ° C. or higher, more preferably 120 to 140, as a ring and ball method softening point. If the temperature is less than 110 ° C., the properties are inferior due to softening of polyethylene, which is not preferable. The ring and ball softening point is a value measured according to JIS-K2207.

  The polyethylene wax used in the present invention is preferably used as an aqueous dispersion for use as a sizing agent. The aqueous dispersion can be used in the form of an emulsion, a dispersion or the like. Generally used surfactants often do not have a particle size, but the polyethylene wax has a controlled particle size within a certain range, and the particles are uniformly present in the glass fiber bundle. The glass fiber bundle can be opened more uniformly by an external force received from a protrusion or roller for opening the fiber. The average particle size of the polyethylene wax is preferably 7.0 μm or less, and more preferably 0.1 to 3.0 μm. When the value is 7.0 μm or more, the workability is inferior due to the deterioration of the convergence, which is not preferable.

  The polyethylene wax is preferably contained in an amount of 1 to 20% by mass, more preferably 3 to 15% by mass, based on the total mass of the solid content of the sizing agent. If the content is less than 1% by mass, the glass fiber bundle may not be fully opened, which may cause poor appearance and strength, and if it is 20% by mass or more, workability is reduced due to a decrease in take-up tension. Furthermore, the glass fiber bundle is not fully opened, which may cause a poor appearance and strength.

  In addition to the above components, the sizing agent is a resin component such as, for example, a resin such as vinyl acetate resin, acrylic resin, polyester resin, polyether resin, phenoxy resin, polyamide resin, epoxy resin, or a modified product thereof. Alternatively, oligomers such as waxes represented by polypropylene resin wax can be used in combination. However, the above resins and oligomers are usually water dispersions obtained by water dispersibility with surfactants, or water-soluble by neutralization or hydration of carboxylic acid groups or amide groups present in the skeleton of the resin or oligomer. In general, it is used in the form of an aqueous solution obtained by oxidization.

  In addition to the above components, the sizing agent may be an antistatic agent typified by an inorganic salt such as lithium chloride or potassium iodide, a quaternary ammonium salt such as an ammonium chloride type or an ammonium ethosulphate type, or an aliphatic group. A lubricant typified by an ester-based, aliphatic ether-based, aromatic ester-based, or aromatic ether-based surfactant may be included.

  About the glass fiber processed with the said sizing agent in this invention, it is preferable that the average diameter of a monofilament is 6-23 micrometers, More preferably, it is 10-17 micrometers. When the average diameter of the monofilament is less than 6 μm, the pellet becomes expensive when it is impregnated with a matrix resin later, and when it exceeds 23 μm, the mechanical properties of the pellet are inferior.

  The fiber treatment method using the sizing agent of the present invention is not particularly limited. For example, a silane coupling agent and a pH adjuster are prepared by emulsifying an emulsion obtained by adding an emulsifier and water to the polyolefin polymer as described above. And a method of sizing the fiber using a sizing agent obtained by blending polyethylene wax with a lubricant, an antistatic agent or the like.

  The sizing agent of the present invention is preferably applied in an amount of 0.1 to 2.0% by mass as a solid content with respect to the total amount of fibers to which the sizing agent is applied. If the applied amount is less than 0.1% by mass, the fiber is not sufficiently converged and easily fuzzed, and the adhesion between the fiber and the matrix resin is inferior. On the other hand, if the applied amount exceeds 2.0% by mass, The fiber bundles are not sufficiently opened when the matrix resin is impregnated, and this causes a defect due to the presence of unopened fiber bundles in the matrix resin.

  Next, the long fiber reinforced polyolefin resin molding material of the present invention using the roving of the present invention will be described. The long fiber reinforced polyolefin resin molding material of the present invention is obtained by impregnating the above roving into a matrix resin made of a polyolefin resin, and the glass fibers are substantially the same length and arranged in parallel in the matrix resin. It consists of the arranged wire-like or pellet-like material.

  In addition, the roving in the present invention includes a glass fiber of a wound body called a cake in addition to a glass fiber in a narrow sense wound in a cylindrical shape, and the roving includes multi-end roving and single-end roving. The roving of the present invention is preferably a glass fiber body made of the single end roving and the cake.

  The polyolefin resin used as the matrix resin is not particularly limited, and those selected from olefin homopolymers and two or more olefin copolymers can be used, and polypropylene is preferred. Moreover, in order to improve adhesiveness with glass fiber, it is preferable that it is acid-modified with maleic acid, acrylic acid or the like because of good compatibility with the sizing agent. Furthermore, if necessary, known additives such as colorants, modifiers and fillers other than glass fibers can be appropriately blended in the polyolefin resin according to the application and molding conditions. It can be used by kneading with a resin.

  In the present invention, “the glass fibers are substantially the same length and arranged in parallel in the same direction” means that most of the glass fibers are arranged in parallel in the same direction. However, some fibers may be partially curved or entangled with each other. In addition, since the glass fibers have substantially the same length, the cut cross-sections of the glass fibers are substantially aligned with the end faces of the wire-like or pellet-like material in the fiber direction, and the glass single fibers are substantially parallel to each other. It is arranged.

  And in the long fiber reinforced polyolefin resin molding material of the present invention, since the polyolefin resin is impregnated between the glass single fibers in the wire or pellet material, it exhibits high fiber dispersibility at the time of molding. In addition, a molded product having excellent mechanical properties can be obtained.

  Moreover, in this invention, although the fiber content rate of the long fiber-ized polyolefin resin molding material is not specifically limited, In order to bring out the effect of this invention notably, it is preferable to make a fiber content rate 25-70 volume%. That is, in the present invention, even when the glass content is relatively high, since the impregnation state of the matrix resin is good, when the fiber content is less than 25% by volume, the reinforcing effect by the glass fiber cannot be obtained, which is not preferable. Further, if it exceeds 70% by volume, the specific gravity of the long fiber reinforced polyolefin resin molding material is increased, which is not preferable.

  Furthermore, in the present invention, the length of the long fiber reinforced polyolefin resin molding material is not particularly limited, but is preferably 3 to 30 mm. When the length is less than 3 mm, fluff is likely to occur during the production of the wire-like or pellet-like material of the long-fiber reinforced polyolefin resin molding material, and the effect of reinforcing the long fiber is hardly exhibited. On the other hand, when the length exceeds 30 mm, the fiber may be dispersed or the fluidity of the fiber may be lowered during molding by injection molding.

  Further, the average diameter of the long fiber reinforced polyolefin resin molding material is preferably 0.3 to 3.0 mm. The long fiber reinforced polyolefin resin molding material of the present invention uses a special glass fiber sizing agent, which improves workability problems when producing a relatively thin diameter long fiber reinforced polyolefin resin molding material. However, if it is less than 0.3 mm, the bulk density of the molding material becomes small, and the transportability is inferior. On the other hand, if the thickness exceeds 3.0 mm, the dispersibility of the fibers is poor when molding by injection molding, which is not preferable.

  In the method for producing a long-fibre polyolefin resin molding material, for example, the roving drawn out from the inside or outside of the wound body is introduced into the impregnation die. The impregnation die is supplied with molten polypropylene resin or the like from the extruder, and the roving is impregnated with the polypropylene resin. The roving impregnated with polypropylene resin is drawn out through a die, thereby removing excess polypropylene resin to obtain a predetermined fiber content and forming into a predetermined shape to form a desired long fiber reinforced polypropylene resin. Material.

  In the above example, the melt impregnation method in which the polypropylene resin melted in the roving is impregnated is used as a method of applying or impregnating the continuous glass fiber bundle with the polypropylene resin, but other methods can also be adopted. For example, after applying or impregnating a roving with an emulsion of polypropylene resin, a suspension in which polypropylene resin powder is dispersed in water or other liquid, or a resin solution in which polypropylene resin is dissolved in a solvent, the dispersion medium Or the method of removing a solvent is also employable.

  In addition to the method of using an impregnation die, a method such as a roll coater or a curtain coater can also be adopted as the method of applying or impregnating. Furthermore, after making polypropylene resin powder adhere to a roving, the method of heat-melting as needed and then cooling can also be employ | adopted. According to this manufacturing method, as in the prior art, the glass fiber bundle is brought into contact with protrusions or rollers in the impregnation die, the fiber bundle is opened by applying tension, and cutting is performed without impregnation with polypropylene resin. The impregnation of the polypropylene fiber into the glass fiber bundle can be promoted by the heating process of the object. However, it is preferable to employ a melt impregnation method from the viewpoint that a drying or desolvation step is unnecessary and cost.

  Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

<Production example>
Robbings for long fiber reinforced polyolefin resins of Examples 1 to 4 and Comparative Examples 1 to 3, and long fiber reinforced polyolefin resins impregnated in the matrix resin with the blending ratio as shown in the upper stage of Tables 1 and 2 below A molding material (pellet) was produced. The following materials were used as specific raw materials for each sizing agent and matrix resin.

[Binder]
γ-aminopropyltriethoxysilane oxide polypropylene emulsion (weight average molecular weight 25,000, acid value 45)
Surfactant A (Polyoxyethylene derivative, HLB13)
Surfactant B (Polyoxyethylene derivative, HLB12.8)
Low molecular weight polyethylene wax dispersion (Mitsui Chemicals Co., Ltd .: part number is listed in the table)

[Matrix resin]
Polypropylene resin (HOMO, MI = 30)
Maleic acid-modified polypropylene resin (HOMO, MI = 10, acid value 10)
Hydroperoxide

Test example 1
The results of evaluating the rovings of Examples and Comparative Examples are summarized and shown in the middle of Tables 1 and 2 below. In addition, about the take-up tension, the generated fluff amount, and the spread width (opened state), the rovings of Examples and Comparative Examples were evaluated by the following procedure and measurement method using an evaluation apparatus as shown in FIG.

(Preparation)
a) An evaluation sample (glass fiber wound body) 3 was set at a designated position.
b) The end yarn of the glass fiber strand 4 was pulled out and passed through the pre-opening bar 1 and the pre-opening bar 2 having a diameter of 210 mm supported on the table 5.
c) The strand 4 is passed through an opening skewer consisting of five skewers (upper and lower, each having a pitch of 12 mm) in the opening BOX 6 having a diameter of 5 mm that are alternately arranged above and below, and the end of the strand 4 is passed through the take-up device 7. Threaded.
d) A predetermined weight was placed on the upper bar 8 of the opening skewer of the opening BOX 6 so as to be sandwiched between the upper and lower skewers, and a load was applied to the passing strand 4.
e) The take-up device 7 was started at a take-up speed of 18 m / min for a predetermined time.

(Tension measurement)
f) The take-up tension of the strand 4 was measured using a tension meter while the take-up device 7 was activated.

(Spread width measurement)
g) Subsequently, the width of the strand 4 passing through the opening skewer of the opening BOX 6 was measured with a caliper. In addition, the state of opening was visually observed and evaluated in three stages: ◯: good (uniformly opened), Δ: normal (partially opened), and x: bad (inferior opening).

(Fuzz amount measurement)
h) After picking up for a predetermined time, the fluff on the mesh in the opened BOX 6 sucked by suction was collected, and the fluff weight was precisely weighed.
i) After changing the measurement load and starting the take-up device 7 for a predetermined time, f) to h) were repeated.
j) At the time of sample exchange, the strand of the previous sample was cut in front of the pre-opening bar, a sample to be newly evaluated was set at the designated position, and the end yarn was bound.
k) The bound end yarn portion was passed to the take-up device, and after the inspection of the process, the procedures of d) to j) were repeated.

Test example 2
The physical properties of the pellets of Examples and Comparative Examples were evaluated. The results are summarized in the lower part of Tables 1 and 2.

  From the results shown in Tables 1 and 2, all of the materials added with low molecular weight polyethylene wax have low tension. This shows the yarn separation from the wound body of the glass strand, and the yarn breakage at the end of the glass filament due to the back tension at the time of drawing the strand is reduced, and the generation of fluff is suppressed. Therefore, the take-up tension is low, the amount of fluff generated is small, the occurrence of yarn breakage due to clogging of the nozzle of the impregnation die and the fiber guide before the impregnation die can be reduced, and productivity and workability are reduced. Absent. On the other hand, in the comparative example, the take-up tension is large and the amount of fluff generated is large, so that the productivity and workability are easily lowered due to the above-described fluffing. It can be seen that in the examples in which the low molecular weight polyethylene wax was added to the sizing agent, the uniformity of the spreadability in the low load region was improved. Since the physical properties are the same as those of the blank to which no lubricating component is added, the physical properties are hardly affected. On the other hand, in the comparative example in which a low molecular weight polyethylene wax is not contained in the sizing agent and a surfactant is added, the uniformity of fiber opening on the low load side is insufficient.

  Further, among the examples, the larger the polyethylene particle size, the wider the spread width, the smaller the penetration method hardness, the higher the ring and ball method softening point, the better the physical properties, and the workability ( From the balance of the amount of fluff generation, spreadability) and physical properties, it can be seen that the best results were obtained with W900 used in Example 1.

  The present invention can be suitably used as a molding material used for a long fiber reinforced polyolefin resin molded product.

It is a schematic block diagram of the evaluation apparatus in Test Example 1.

Explanation of symbols

1, 2 Pre-opening bar 3 Sample for evaluation 4 Strand 5 units 6 Opening BOX
7 Picking device 8 Bar

Claims (5)

  A roving used as a reinforcing fiber of a long fiber reinforced polyolefin resin molded product, wherein a sizing agent is attached to a plurality of glass fibers, and the sizing agent contains a silane coupling agent, a polyolefin resin, and a polyethylene wax. Roving for long fiber reinforced polyolefin resin, characterized by:   The roving for long fiber reinforced polyolefin resin according to claim 1, wherein the softening point of the polyethylene wax is 110 ° C. or more as a ring and ball softening point.   The roving for long fiber reinforced polyolefin resin according to claim 1 or 2, wherein the polyethylene wax has an average particle size of 0.1 to 3.0 µm.   The long fiber reinforced polyolefin resin roving according to any one of claims 1 to 3, wherein a content of the polyethylene wax in the sizing agent is 1 to 20% by mass with respect to a total solid mass of the sizing agent. .   A long fiber reinforced polyolefin resin roving according to any one of claims 1 to 4 is impregnated into a matrix resin made of a polyolefin resin, and the glass fiber to which a sizing agent is attached is substantially contained in the matrix resin. A long fiber reinforced polyolefin resin molding material characterized by having the same length and being arranged in parallel in the same direction.

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