JP2001113528A - Recycled resin composition, method for molding recycled resin composition, and molded article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recycled resin composition and a molded article holding mechanical characteristics equal or superior to ones of virgin resin, or being further given an effective mechanical characteristic balance according to the use, and being advantageous economically by using recycled resin as the main material. SOLUTION: This composition is constituted of a long-fiber-reinforced thermoplastic resin pellet wherein carbon fibers are arranged in parallel substantially to the direction of the length of the pellet, of which the length is in the range of 3.0-50 mm and of which the content of the carbon fibers is 10-80 mass %, of recycled resin and of virgin resin to be added arbitrarily, and the content of the reinforcing fibers of the composition is within the range of 0.5-50 mass % to the total amount of the above constituents. By molding the composition, a molded article of which the product of the value of bending strength and the value of notched Izot impact strength in the case of the long-fiber-reinforced thermoplastic resin pellet being mixed therein is 0.8-2.0 times as large as a molded article constituted of the recycled resin and the virgin resin, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the recycling of thermoplastics and, more particularly, to the recycling of thermoplastic resin pellets of a specific length and reinforced with long carbon fibers aligned in a specific direction. The present invention relates to a recycled resin composition obtained by adding to a mixture of virgin resin and virgin resin, a molding method thereof, and a molded article.

[0002]

2. Description of the Related Art Conventionally, landfill and incineration have been mainly used as a method of treating plastic garbage. However, due to the recent increase in environmental awareness, it has become difficult to increase the number of landfills and incineration plants. On the other hand, there is a movement to utilize crushed pieces (recycled resin) obtained by pulverizing plastic garbage by mixing them with virgin resin. However, compared to virgin resin, physical properties and hue are inferior. It was difficult to use. In addition, as disclosed in Japanese Patent Application Laid-Open No. 10-1287872, there is a method of using recycled resin as it is as a base resin of long fiber reinforced resin, but there is a problem that a step of applying the recycled resin to an extruder leads to an increase in cost. Further, in addition to the above-mentioned recycling method, a method of adding short glass fibers, and a method disclosed in JP-A-11-16605
As disclosed in Japanese Patent Application Laid-Open No. 4 (1999) -197, there is provided a method of increasing the rigidity mainly by adding long glass fibers, but at the same time, has a drawback that the impact resistance is remarkably reduced.

[0003] In this specification, an international unit system is used as a unit with the enforcement of the new measurement law. Therefore, "weight" conventionally used in the meaning of mass is described as "mass". In accordance with this, “% by weight”, “parts by weight” and the like are described as “% by weight”, “parts by weight” and the like.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to utilize a recycled resin as a main raw material and maintain mechanical properties equal to or higher than that of a virgin resin, or to obtain an effective machine according to the intended use. To provide a recycled resin composition and a molded article that are economically advantageous by imparting a balance of properties.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that reinforcing fibers are arranged substantially parallel to the length direction of the pellet, and It has been found that the mechanical properties of the recycled resin molded product are significantly improved by adding a carbon long fiber reinforced thermoplastic resin pellet having a diameter in the range of 3.0 to 50 mm to the recycled resin.

That is, a first aspect of the present invention is that the reinforcing fibers are arranged substantially parallel to the longitudinal direction of the pellet,
And the length of the pellet is in the range of 3.0 to 50 mm,
Consisting of a long fiber reinforced thermoplastic resin pellet (A) having a carbon fiber content of 10 to 80% by mass as a reinforcing fiber, a recycled resin (B), and a virgin resin (C) added as needed. And a recycled resin composition in which the content of the reinforcing fibers is in the range of 0.5 to 50% by mass based on the total amount of the above (A), (B) and (C) optionally added. . The second aspect of the present invention is that the composition ratio of the long fiber reinforced thermoplastic resin pellet (A), the recycled resin (B) and the virgin resin (C) is 0% by mass <A <80.
Mass%, 0 mass% <B <100 mass%, 0 mass% ≦ C <
The recycled resin composition according to the first aspect of the present invention, which has a range of 90% by mass, is provided. The third aspect of the present invention is the method according to any one of the first to second aspects, wherein the melting point of the base resin of the long fiber reinforced thermoplastic resin pellet is within ± 40 ° C. of the melting point of the recycled resin. Provide a recycled resin composition. A fourth aspect of the present invention is to mix the recycled resin composition according to any one of the first to third aspects of the present invention, and to heat and disperse and / or disperse the base resin in the composition,
Provided is a method for molding a recycled resin composition, characterized by molding. A fifth aspect of the present invention is the molding of the recycled resin composition according to the fourth aspect, wherein the molding is performed so that 15% by mass or more of the reinforcing fibers in the molded article has a length of 1 mm or more. Provide a way. Sixth Embodiment
Provides a recycled resin composition molded article obtained by the molding method according to the fourth or fifth aspect of the present invention. Seventh of the present invention
Means that the content of carbon fibers in the molded article composed of the recycled resin (B) and the virgin resin (C) added as required is the sum of (A), (B) and (C) On the other hand, when the long fiber reinforced thermoplastic resin pellets (A) are mixed so as to be 3% by mass, 5% by mass, and / or 10% by mass, respectively, the notched Izod impact strength of the molded product is at least each. 7. The method according to claim 6, wherein the flexural modulus is improved by at least 2 times, 3 times, and / or 4 times or more while maintaining 0.7 times, 0.6 times and / or 0.5 times. And a molded article of the recycled resin composition described above. An eighth aspect of the present invention is a molding method in which a long fiber reinforced thermoplastic resin pellet (A) is mixed with a molded product comprising a recycled resin (B) and a virgin resin (C) added as required. The product of the bending strength of the product and the value of the notched Izod impact strength is
A sixth aspect of the present invention, which is 0.8 to 2.0 times.
And a molded article of the recycled resin composition according to (1).

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION (1) Recycled resin In the present invention, a recycled resin (B) has a general concept of a plastic which is molded and recovered after being used for a target application, and is used after molding. It refers to those recovered as they are, those that have become unusable as virgin resins due to deterioration during storage and the like, and mixtures thereof.

Examples of the base resin of the recycled resin include thermoplastic general-purpose resins, engineering resins, alloy resins, and mixtures thereof. Specifically, a thermoplastic resin such as polyethylene, polypropylene, polystyrene, polybutylene terephthalate, polyethylene terephthalate, polycarbonate, polyvinyl chloride, polyvinyl acetate, polyacrylonitrile, homopolymer such as nylon, or a mixture of homopolymer and copolymer Alloy resin such as acrylonitrile-styrene copolymer resin (AS resin) acrylonitrile-butadiene-styrene copolymer resin (ABS resin), or a mixture of the above thermoplastic resin and alloy resin;
The present invention includes these as thermoplastic resins. In addition, the recycled resin is made of glass, mica, talc, aluminum, or any other known material using the above-mentioned thermoplastic resin as a base resin, and one type of reinforcing agent having any shape such as long fiber, short fiber, whisker, and powder. Alternatively, two or more kinds may be contained. In addition, stabilizers, plasticizers, coloring agents, various additives such as flame retardants, powdered inorganic fillers such as pigments,
It may contain various decorative materials such as paints and deposits. Therefore, the term “recycled resin” includes those containing the above-mentioned additives and fillers in addition to the base resin.

There is no particular limitation on the shape of the original molded article of the recycled resin (B). For example, home appliances such as computers, televisions, refrigerators, air conditioners, washing machines, desks, chairs,
Any plastic products can be used, including office supplies such as shelves, automobile parts, and the like. Recycled resin (B)
May be a molded article as it is, but is preferably chopped to a size approximately equal to or less than the size of the long fiber reinforced thermoplastic resin pellet (A) because it is mixed with the long fiber reinforced thermoplastic resin pellet (A). Or crushed.

(2) Resin of long fiber reinforced thermoplastic resin pellet and virgin resin Virgin resin refers to unused pellets, powders, and granular plastics. The base resin and the virgin resin of the long fiber reinforced thermoplastic resin pellets may be the same as or different from the base resin of the recycled resin. For example, polystyrene resins such as general-purpose polystyrene, impact-resistant polystyrene, AS resins and ABS resins, polyolefin resins such as polyethylene and polypropylene, thermoplastic polyester resins such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate resins, and chloride resins Vinyl, halogen-containing polyolefin resin such as chlorinated polypropylene, 6-nylon,
6,6-nylon, 4,6 nylon, 11-nylon,
Polyamide resins such as 12-nylon, polyacrylic resins such as polyethyl acrylate resin and polymethyl methacrylate resin, polysulfonic acid resins, polyphenyl ether resins, polyacetal resins, liquid crystalline aromatic polyester resins, polyphenylene sulfide resins, poly All thermoplastic resins from general-purpose resins such as ether ether ketone resins to super engineering plastics and alloy resins composed of two or more of these resins can be used. The resin forming the alloy is not limited to the thermoplastic resins listed here, but may be other known thermoplastic resins and their thermoplastic resins.
More than one type of alloy resin can be used. In addition to base resin, carbon long fiber reinforced thermoplastic resin and virgin resin, various resin additives such as stabilizers, plasticizers, coloring agents, flame retardants, and powdered inorganic fillers such as talc, silica, and pigments Materials may be included. Further, one or two or more kinds of reinforcing materials having various shapes such as long fibers, short fibers, whiskers, and powders may be included in glass, mica, talc, aluminum, and any other known materials. Therefore, the long fiber reinforced thermoplastic resin pellet and the virgin resin include those containing the above-mentioned additives, fillers, reinforcing materials, and the like in addition to the base resin. That is, according to the present invention, it is possible to cope with all kinds of recycled thermoplastic resins.

In the present invention, the term “recycled resin composition” refers to a mixture obtained by adding a recycled resin (B), a long fiber reinforced thermoplastic resin pellet (A), and, in some cases, a virgin resin (C). The resin molded product is obtained by molding the recycled resin composition.

Specific examples of "compatible" in the present invention are as follows: if the recycled resin, the long-fiber reinforced thermoplastic resin pellets, and the virgin resin base resin are the same, they can be used without any problem. However, other resins can also be used as long as the resins are mutually compatible in bulk, or if the compatibility is increased by adding a compatibilizer or the like. Even if the base resin of the long-fiber reinforced thermoplastic resin pellets and the base resin of the recycled resin are almost incompatible with each other, they have similar melting points and viscosities. Can be used if they are dispersed with each other to form a matrix and a domain. In this case, preferably, in the case of a polypropylene and a nylon resin, a material having a function of improving the interfacial adhesive strength between the resins is added, such as maleic acid-modified polypropylene, in terms of mechanical properties and appearance. A better recycled resin molded product can be obtained. As for the degree of compatibility and dispersion of the resins, the carbon long fiber reinforced thermoplastic resin pellet (A) is mixed with the recycled resin (B) or a mixture of the recycled resin (B) and the virgin resin (C), and molded. When the obtained recycled resin molded product is broken, the mixed resin can be used as long as the mixed resin is not uniformly dispersed and does not form a layer.

(3) Long Fiber Reinforced Thermoplastic Resin Pellets (A) In general, when reinforced fibers such as glass fibers are added to a non-reinforced resin, rigidity such as tensile strength and flexural strength and flexural modulus and the like are obtained. While the impact strength represented by the Izod impact strength decreases on the contrary. Therefore, it is preferable that the amount of the reinforcing fiber added is kept to the minimum according to the required characteristics of the application. However, when the length of the reinforcing fibers in the fiber-reinforced resin molded product becomes longer than a certain value, the impact strength increases according to the length. In this case, within a certain range, the impact strength further increases in accordance with the amount of the fiber added. Therefore, we tried to add long-fiber reinforced resin reinforced with various kinds of fibers.However, resin fibers such as aramid and nylon hardly contribute to the improvement of rigidity, and glass and stainless steel have bending elasticity. Although it contributed to the improvement in rigidity, including the rate, the initially recovered recycled resin often already contains various additives, reinforcing materials, and decorative materials depending on the application. In this case, the long fiber reinforcing material is liable to break during molding, and the long fibers in the molded product cannot maintain their length sufficiently. Therefore, depending on the addition of many long fiber reinforced resins,
The drop in impact strength cannot be sufficiently suppressed.

On the other hand, in the case of adding carbon long fiber thermoplastic resin pellets, the hardness of carbon fiber is significantly higher than that of glass fiber, so that it is hardly affected by the reinforcing material and the like added to the recycled resin from the beginning. The length of the fibers is maintained longer after molding. As a result, the impact strength of the molded article of the recycled resin composition is maintained at an extremely high value in various test methods, and high rigidity can be obtained with a small amount of addition. Therefore, in order to improve the mechanical properties of the recycled resin molded article or to maintain the mechanical property balance according to the application, the reinforcing fibers according to the present invention are arranged substantially parallel to the length direction of the pellet. It is preferable to use carbon long fiber reinforced thermoplastic resin pellets having a pellet length in the range of 3.0 to 50 mm.

The long fibers of the long fiber reinforced thermoplastic resin pellets used in the present invention may be those having a higher hardness for the above-mentioned reasons. Examples thereof include glass and carbon, and carbon fibers are preferable in order to keep the remaining fiber length in the recycled molded product longer. In addition, as a raw material for producing carbon long fiber reinforced thermoplastic resin pellets, there are suitable sizing agents (epoxy-based ones currently commercially available, but the carbon fibers are not limited thereto. However, it is more preferable to increase the adhesion and affinity with the resin.

The greater the amount of the carbon fiber reinforced thermoplastic resin pellets added to the recycled resin, the better the mechanical properties of the recycled resin molded product. However, actually, since the content of the reinforcing fiber added controls the mechanical properties, the content of the reinforcing fiber is the above (A),
When carbon long fiber reinforced thermoplastic resin pellets are added in an amount of 0.5 to 50% by mass, preferably 1 to 20% by mass with respect to the total amount of (B) and (C) added as needed. The cost objective improvement effect is more excellent.

The content of the reinforcing fibers in the long fiber reinforced thermoplastic resin pellets used in the present invention can be used in the range of 3 to 80% by mass. However, if the content of the reinforcing fibers is too small, the added amount of the long fiber reinforced thermoplastic resin pellets increases, so that the content of the reinforcing fibers in the long fiber reinforced thermoplastic resin pellets is substantially 10 to 80. mass%
It is preferable to use those in the range.

The length of the reinforcing fibers in the long fiber reinforced thermoplastic resin pellet used in the present invention is such that the reinforcing fibers are arranged substantially parallel to the length direction of the pellet, and Is in the range of 3.0 to 50 mm,
Substantially corresponds to the length of the pellet.

The diameter of the reinforcing fibers used is preferably in the range of 4 to 30 μm. As the diameter of the reinforcing fiber becomes smaller, the contact area with the resin becomes larger and the reinforcing effect increases, but if it is less than 3 μm, it may enter the respiratory system (“Guideline Manual on Occupational Health of Glass Fibers” / Glass Fiber Association) ) In addition, problems such as poor dispersion of the reinforcing fibers in the molten resin, insufficient reinforcement effect, and clogging of the air supply line by the reinforcing fibers separated from the pellets are likely to occur. In addition, when the fiber diameter becomes large, the contact area with the resin becomes small, and there is a problem that, depending on the kind of the fiber, the stimulation when touching the hand becomes strong (such as tingling). This can be said to be almost the same as in the case of glass.

The method for producing carbon long fiber reinforced thermoplastic resin pellets according to the present invention is not particularly limited.
The pellets produced in the manner of covering the electric wires have poor dispersibility of the reinforcing fibers during molding, and therefore, the pultruding method (USP-3)
It is more preferable to use long fiber reinforced pellets produced by the method described in U.S. Pat. The method of producing long fiber reinforced thermoplastic resin pellets is based on known techniques (roving shape of reinforcing fiber, plastic method (drawing method and apparatus in drawing method), preheating method of reinforcing fiber, Fiber method, impregnation method with thermoplastic resin and reinforcing fiber, shaping method after resin impregnation, cooling method, cutting method, etc.) and know-how can all be used.

The length of the long fiber reinforced thermoplastic resin pellets as the vitamin resin according to the present invention is 3.0 to 50.
Although the range of mm is preferable, a pellet having a length of 4.0 to 25 mm is particularly preferable. If the pellets are shorter than this range, the reinforcing fibers in the molded article using the recycled resin having improved physical properties become short, and a sufficient reinforcing effect cannot be obtained. In addition, if the length is longer than this range, the bulk density when packed in a bag increases, the transport efficiency decreases, and bridging occurs in the hopper at the time of molding, resin is clogged, biting into the screw becomes worse. Can occur. Further, the aspect ratio of the long fiber reinforced thermoplastic resin pellet is preferably 2 or more.

Generally, a recycled resin is used for various purposes, and therefore contains various additives such as a colorant, a reinforcing material, and a flame retardant. The effect of improving the physical properties changes depending on the type and content of these additives, but 15% by mass or more of the reinforcing fibers in the recycled resin molded product is 1 m.
If the length is maintained at least m, a sufficient reinforcing effect can be obtained.

The recycled resin composition comprising the long fiber reinforced thermoplastic resin pellets and the recycled resin according to the present invention may be a reinforcing material other than the above carbon long fibers (short carbon fibers, glass fibers, aramid fibers, etc.) according to the purpose. , Filler (glass beads, calcium carbonate, aluminum hydroxide, aluminum oxide, talc, mica, zeolite,
Ferrite, etc.), colorant (carbon black, titanium white, red iron, etc.), flame retardant (hydroxide, brominated bisphenol A (TBA), decabromobiphenyl ether, antimony oxide, molybdenum oxide, phosphate ester) And the like, and other well-known additives as functional additives may be added in appropriate amounts.

The method of mixing the long fiber reinforced thermoplastic resin pellets and the recycled resin according to the present invention is not particularly limited, and various known mixing devices (extruder, brabender, kneader, Banbury mixer, etc.) are used. be able to. In general, long fiber reinforced thermoplastic resin pellets are liable to be broken due to their pellet form and high reinforcing fiber content, and therefore it is preferable to mix them with a mixing device and mixing conditions with as little impact as possible.

The mixture of the long carbon fiber reinforced thermoplastic resin pellet and the recycled resin thus obtained can be formed into a molded product by a known molding means such as injection molding, extrusion molding, press molding and the like. Also, depending on the molding machine used, the components may be directly charged into the molding machine cylinder without mixing the long fiber reinforced thermoplastic resin pellets and the recycled resin before molding beforehand and mixed in the molding process. Then both methods are said to be mixed. In the molding step, the mixed carbon long fiber reinforced thermoplastic resin pellets and recycled resin are heated to a temperature equal to or higher than the melting point of the base resin, and the two are substantially uniformly dispersed. As a result, the base resin of the long fiber reinforced resin, the reinforcing fibers, and the recycled resin are well dispersed with each other, and when observing the fracture surface of the obtained recycled resin composition molded article, the bias to a part of the fibers, Phase separation and the like are reduced. Furthermore, the compatibility of two or more resins can be improved by all known compatibilizers and dispersants. In addition, when the carbon long fiber reinforced thermoplastic resin pellets and the recycled resin are heated to a melting point of the base resin or higher, and those which have undergone a step in which both are in a compatible state are added to a molding machine and then molded,
It is included in "mixing and molding" of the present invention. In addition, a material using recycled resin as a base resin of carbon long fiber reinforced thermoplastic resin pellets, or a material obtained by mixing a proper amount of recycled resin with carbon long fiber reinforced thermoplastic resin pellets can be used as a master batch.
In addition to the long fiber reinforced thermoplastic resin pellets and the recycled resin, a virgin resin can be added for the purpose of adjusting the carbon fiber content or improving the surface condition of the recycled resin molded product.

The molded article of the recycled resin composition obtained according to the present invention can be used for various kinds of products, as long as the thermoplastic resin can be used.

The properties of the obtained recycled resin molded product are as follows:
It is evaluated based on the degree of improvement in tensile physical properties such as tensile strength, bending physical properties such as bending strength and bending elastic modulus, and impact physical properties such as notched Izod impact strength. Of these, tensile properties and bending properties are increasing by the addition of reinforcing fibers,
Impact resistance tends to decrease. Therefore, as an indicator of the balance of these physical properties, the product of the tensile strength, bending strength and flexural modulus and the Izod impact strength, for example, the notched Izod impact strength, more specifically, the bending strength and the Izod impact strength The value of the product can be used. According to the present invention, a long fiber reinforced thermoplastic resin pellet (A) is mixed with a molded article comprising a recycled resin (B) and a virgin resin (C) optionally added, and The carbon fiber content is 0.5 to 50% by mass based on the total amount of (B) and (C), generally 1%.
The product of the value of the bending strength and the value of the notched Izod impact strength of the molded product in the case of adjusting to 20% by mass is 0.
8 to 2.0 times, 0.9 in general carbon fiber content
It was found to be 1.5 times, preferably 1.0 times or more. On the other hand, in the conventional glass fiber, the product of the bending strength of the molded product and the value of the notched Izod impact strength can be improved to less than about 0.7 at most.

[0028]

The following are some examples and comparative examples, but the present invention is not limited to them. [Example 1] Pellets in which reinforcing fibers are arranged substantially parallel to the length direction of a pellet in a bumper recycled resin crushed product (base resin; bumper grade polypropylene, color; black, talc 8 mass% added product) Length 11.2
mm long carbon fiber reinforced polypropylene resin pellets (PP-CF30-01, manufactured by Daicel Chemical Industries, Ltd.
The carbon fiber content is set to 30% by mass (carbon fiber content is 30% by mass) so that the carbon fiber content becomes 0% by mass (carbon fiber-reinforced polypropylene resin pellet is not added (reference value)), 3% by mass, 5% by mass, and 10% by mass, respectively. Add, mix well,
A recycled resin mixture consisting of long fiber reinforced thermoplastic resin pellets and a resile resin was obtained. Next, this mixture was injection-molded to form a test piece used for a physical property measurement test. Using this test piece, a tensile test, a bending test, an Izod impact test, and a load deflection test (stress σ = 0.45 MPa)
Was done. As can be seen from the results shown in Table 1, by adding the carbon long fiber reinforced polypropylene resin pellets to the bumper recycled resin pulverized product, other mechanical properties can be remarkably improved without greatly reducing the impact strength. Was.

Example 2 The carbon long fiber reinforced resin pellets added were grades using thermoplastic polyurethane as a matrix resin (TPU-CF40-01, Ticon).
a, manufactured by Celstran Incorporated, carbon fiber content 40% by mass, pellet length 11.
The mechanical property test was performed in the same manner as in Example 1 except that the length was 7 mm). As a result, as shown in Table 2, by adding carbon long fiber reinforced thermoplastic polyurethane resin pellets to the bumper recycled resin, other mechanical properties could be remarkably improved without greatly reducing the impact strength. .

Example 3 A grade (RP-CF) in which the added carbon long fiber reinforced resin pellets were obtained by repelling bumper recycled resin into a matrix resin.
30-01, manufactured by Daicel Chemical Industries, Ltd., with a carbon fiber content of 30% by mass and a pellet length of 11.3 mm). As a result, as shown in Table 3, by adding the carbon long fiber reinforced thermoplastic polyurethane resin pellets to the bumper recycled resin, other mechanical properties could be remarkably improved without greatly reducing the impact strength. .

[Comparative Example 1] Except that the addition of the reinforcing material was short glass fiber reinforced polypropylene resin pellets (Ube Polypro, CG230, manufactured by Ube Industries, Ltd., glass concentration: 30% by mass) A mechanical property test was performed in the same manner as in Example 1. In short fiber reinforced polypropylene resin pellets, the short fibers are not oriented in the length direction of the pellet. As a result, as shown in Table 4, by adding the short glass fiber reinforced polypropylene resin pellets to the bumper recycled resin, the rigidity including the flexural modulus was slightly improved, but the impact strength was significantly reduced.

[Comparative Example 2] A glass fiber reinforced polypropylene resin pellet (Plastron PPG50-01, manufactured by Daicel Chemical Industries, Ltd., glass concentration: 50% by mass, pellet length: 12) was added as a reinforcing material. 8mm)
A mechanical property test was performed in the same manner as in Example 1 except for the following. As a result, as shown in Table 5, by adding short glass fiber reinforced polypropylene resin pellets to the bumper recycled resin, the rigidity including the flexural modulus was improved, but the impact strength was significantly reduced.

That is, the long fiber reinforced thermoplastic resin pellets are mixed with the recycled resin to reduce the carbon fiber content to 3%.
%, 5% by weight, and 10% by weight, respectively, to maintain the notched Izod impact strength at least 0.7 times, 0.6 times, and 0.5 times, respectively, before mixing. However, the flexural modulus can be improved by a factor of 2, 3, and / or 4 or more, respectively. In addition, for a molded article composed of the recycled resin (B) and the virgin resin (C) added as needed, the long-fiber-reinforced thermoplastic resin pellet (A) is mixed with a carbon fiber having a content of:
As an index of the improvement of the physical properties of the molded article when mixed so as to be 3% by mass, 5% by mass, and / or 10% by mass with respect to the total of (A), (B) and (C), The value of the product of the bending strength and the notched Izod impact strength was about 1 times or more. Regarding impact resistance,
For example, in a falling ball impact test, the ratio was maintained at 95% or more for a molded product composed of the recycled resin (B) and the virgin resin (C) added as needed. Table 1
Then, the deflection temperature under load test is performed under a load condition of 1.82 MPa, and other tests are performed at 23 ° C. and relative humidity (RH).
Performed under 50% conditions. In Tables 2-5, each test was 23
C. and a relative humidity (RH) of 50%.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

[0039]

According to the present invention, a recycled resin can be used to reduce the impact resistance in a notched Izod impact test without significantly lowering the impact resistance in the notched Izod impact test, and to reduce the impact resistance in a falling ball impact test with almost no impact resistance. The resin can be improved to a resin having mechanical properties equal to or higher than that of the resin, and plastic recycling activities are promoted. In particular, it can be used as a substitute for engineering resins such as polyethylene terephthalate, polycarbonate and nylon 6,6.

Claims (8)

[Claims] The reinforcing fibers are arranged substantially parallel to the length direction of the pellet, and the length of the pellet is in the range of 3.0 to 50 mm, and the reinforcing fibers contain carbon fibers. Long fiber reinforced thermoplastic resin pellets having an amount of 10 to 80% by mass (A), recycled resin (B),
And a virgin resin (C) added as needed, and the content of the reinforcing fiber is 0.1% with respect to the total amount of (A), (B) and (C) optionally added. 5-5
A recycled resin composition in the range of 0% by mass. 2. A long fiber reinforced thermoplastic resin pellet (A), a recycled resin (B), and a virgin resin (C).
Are 0 mass% <A <80 mass%, 0 mass% <B
The recycled resin composition according to claim 1, wherein <100% by mass, 0% by mass ≦ C <90% by mass. 3. The recycled resin composition according to claim 1, wherein the melting point of the base resin of the long fiber reinforced thermoplastic resin pellet is within ± 40 ° C. of the melting point of the recycled resin. . 4. A method comprising mixing the recycled resin composition according to claim 1 and heating to dissolve and / or disperse the base resin in the composition, followed by molding. A method for molding a recycled resin composition. 5. The method for molding a recycled resin composition according to claim 4, wherein the molding is performed such that 15% by mass or more of the reinforcing fibers in the molded product maintain a length of 1 mm or more. 6. A recycled resin composition molded article obtained by the molding method according to claim 4. 7. A molded article comprising a recycled resin (B) and a virgin resin (C) optionally added, wherein the carbon fiber content is (A), (B) and (C).
3% by mass, 5% by mass, and / or
Alternatively, when the long fiber reinforced thermoplastic resin pellets (A) are mixed so as to be 10% by mass, the notched Izod impact strength of the molded product is at least 0.7 times and 0.1% respectively.
The molding of the recycled resin composition according to claim 6, wherein the flexural modulus is improved by at least 2, 3, and / or 4 times or more, respectively, while maintaining at 6 times and / or 0.5 times. Goods. 8. A molded product obtained by mixing a long fiber reinforced thermoplastic resin pellet (A) with a molded product comprising a recycled resin (B) and a virgin resin (C) optionally added. The molded product of the recycled resin composition according to claim 6, wherein the product of the value of the bending strength and the value of the notched Izod impact strength is 0.8 to 2.0 times.