KR101362069B1 - A thermoplastic resin composite composition for long fiber reinforced thermoplastic - Google Patents

Abstract

The present invention relates to a thermoplastic resin composite composition for a long fiber reinforced thermoplastic and a long fiber reinforced thermoplastic prepared by using the same. The composition of the present invention comprises: 35 to 50 parts by weight of a polyamide resin having a relative viscosity of 2.5-3; 5 to 20 parts by weight of a polypropylene resin; 0.1 to 20 parts by weight of a compatibilizer; 0.1 to 20 parts by weight of an additive; and 10 to 60 parts by weight of a hardness reinforcing member. The mixing weight ratio of the polyamide resin and the polypropylene resin is adjusted to be 7:3 to 9:1, thereby improving the wetting property of a matrix resin to the hardness reinforcing member while being favorable in lightweight materials, improving adhesiveness between different surfaces, and maintaining high impact strength and high hardness. [Reference numerals] (AA) Covalent bond; (BB) Matrix resin; (CC) Hardness reinforcing member

Description

A thermoplastic resin composite composition for long fiber reinforced thermoplastic

The present invention relates to a thermoplastic resin composite composition for thermoplastic long fiber reinforced plastics and a thermoplastic long fiber reinforced plastic prepared using the same.

Countries around the world are tightening environmental regulations along with warnings about depletion of energy sources. Therefore, researches to improve energy efficiency have been actively conducted throughout the industry.

This is usually a problem that can be solved by developing mechanical complementary or alternative energy sources, but is only a shortsighted alternative. In addition, the development of mechanical supplementation has already reached a saturation level, and the development and use of alternative energy sources require further research.

On the other hand, it is possible to maximize the fuel efficiency by reducing the weight using lightweight materials and plastics, it can be expected to improve the fuel economy according to the weight reduction. For example, if the weight of the material is reduced by 10%, fuel economy is known to increase by 6-8%.

As the demand for polymer materials is gradually being functionalized, diversified and diversified, a small number of industries are required to replace metals and recycle the final product while maintaining the uni-material, that is, the original performance of the product. It demands the material which considered. Therefore, the application of thermoplastic long fiber reinforced plastic (LFT) material, which is a high-impact and high-strength composite material exhibiting performance that cannot be achieved with a single material, is absolutely necessary.

Among the thermoplastic LFT materials, polypropylene (PP) not only has high chemical stability, but also has excellent corrosion resistance, and has been used in various parts materials throughout the industry as a lightweight material, and many studies have been made. However, the use of PP-LFT has been studied relatively little.

However, when using a PP material alone, due to the characteristics of the material has a disadvantage in that the interfacial binding energy is difficult to play a role as an assembly during bonding or bonding.

Recently, due to the development of LFT processing technology, complex mold design is possible, and mechanical properties are also improved, and research on metal replacement of LFT materials is actively conducted. For automotive parts, LFT replaces lift door modules, front end module carriers, door armrests, paddle blocks and door module plates.

If LFT is replaced with automotive parts, it is possible to reduce the weight and mass production of complex parts through mold design. In addition, when produced using the injection molding method, it can be modularized to integrate each part and maximize the weight reduction rate. Moreover, modularization is at the heart of the automotive industry, a matter of life and death for each automaker. For this reason, the use of LFT is expected to expand gradually.

In the case of PP-LFT manufactured by a conventional pultrusion process, there is a disadvantage in that the interfacial bonding energy is weak due to the characteristics of the PP material, so that it is difficult to serve as an assembly at the time of bonding or bonding, and to compensate for the insufficient mechanical properties. There is a limit to this. Therefore, there is a need to produce an LFT that is not only advantageous in weight reduction but also excellent in back-to-side adhesion, in particular to metal or amorphous transparent material, for example, polycarbonate.

The present invention is advantageous in weight reduction when manufacturing long fiber reinforced plastics (LFT), and has excellent adhesion to other materials, especially metals or amorphous transparent materials, and maintains high impact and high rigidity. And it aims to provide an LFT manufactured using the same.

The present invention as a means for solving the above problems,

35 to 50 parts by weight of a polyamide resin having a relative viscosity of 2.5 to 3 relative to a sulfuric acid solvent; 5 to 20 parts by weight of polypropylene resin; 0.1 to 20 parts by weight of a compatibilizer; 0.1 to 20 parts by weight of the additive; And 10 to 60 parts by weight of the rigid reinforcement,

Provided is a thermoplastic resin composite composition for long fiber reinforced plastics having a mixed weight ratio of polyamide resin and polypropylene resin of 7: 3 to 9: 1.

Moreover, this invention is another means for solving the said subject,

Provided is a long fiber reinforced plastic prepared by using the thermoplastic resin composite composition for long fiber reinforced plastic according to the present invention.

The thermoplastic resin composite composition for long-fiber reinforced plastics (LFT) of the present invention is advantageous in lightening the material at the time of manufacturing the LFT using the same, and has a back side adhesive property, in particular a metal or amorphous transparent material such as polycarbonate It is excellent in adhesion, and can maintain the high impact and high strength to improve the mechanical properties and adhesion of the LFT.

1 is a schematic diagram showing the internal coupling structure of the LFT according to the present invention.
Figure 2 is a schematic diagram of the adhesive for measuring the A-type adhesive strength according to the present invention.
3 is a schematic view showing the adhesion of the test piece for measuring the bond strength of the B-type according to the present invention.

The present invention, 35 to 50 parts by weight of a polyamide resin having a relative viscosity of 2.5 to 3 relative to the sulfuric acid solvent; 5 to 20 parts by weight of polypropylene resin; 0.1 to 20 parts by weight of a compatibilizer; 0.1 to 20 parts by weight of the additive; And 10 to 60 parts by weight of a rigid reinforcing material, and a mixed weight ratio of the polyamide resin and the polypropylene resin is 7: 3 to 9: 1.

Hereinafter, the thermoplastic resin composite composition for long fiber reinforced plastics (henceforth "LFT") of this invention is demonstrated concretely.

The thermoplastic resin composite composition for LFT of the present invention contains 35 parts by weight to 50 parts by weight of polyamide resin, preferably 35 parts by weight to 45 parts by weight, based on 100 parts by weight of the composition. By adjusting the content of the polyamide resin within the above range, the present invention can be advantageous in weight reduction of the material, while improving the adhesion between the back surface. Hereinafter, the term "parts by weight" used in the present invention means a weight ratio.

The said polyamide resin is excellent in adhesiveness between back surfaces, and is suitable for use as a matrix resin for LFT which requires the outstanding adhesiveness with another raw material.

As used herein, the term "matrix resin" refers to a resin composition consisting of the remaining components other than the rigid reinforcing material, i.e., polyamide resin, polypropylene resin, compatibilizer and additives, in the thermoplastic resin composite composition for LFT according to the present invention. .

The polyamide resin is a thermoplastic resin, a polymer having 6 or more repeating units having a -CONH- group, preferably a crystalline aliphatic polyamide.

Specific examples of the crystalline aliphatic polyamides include polyamide 3, polyamide 4, polyamide 6, polyamide 8, polyamide 9, polyamide 11, polyamide 12, polyamide 6,6, and polyamide 6, 10, but is not limited thereto.

The relative viscosity of the polyamide resin relative to the sulfuric acid solvent is 2.5 to 3, preferably 2.7 to 2.9. When the relative viscosity of the polyamide resin is less than 2.5, the impregnability to the rigid reinforcing material may be lowered, and when the relative viscosity of the polyamide resin exceeds 3, the fluidity may increase so much that the impact strength may be lowered. have.

The thermoplastic resin composite composition for LFT of the present invention contains 5 parts by weight to 20 parts by weight of polypropylene resin, preferably 5 parts by weight to 17 parts by weight based on 100 parts by weight of the composition. By adjusting the content of the polypropylene resin in the above range, the present invention is advantageous in lightening the material, while maintaining excellent impregnation for the rigid reinforcing material, it is possible to improve the adhesion between the back.

The polypropylene resin is not only excellent in chemical stability and corrosion resistance, but also useful for weight reduction of the material and suitable for use as a matrix resin for LFT.

The polypropylene resin may be a polypropylene homopolymer or a polypropylene copolymer.

The polypropylene homopolymer is preferably an isotactic polymer containing 99% by weight or more of propylene monomer, because the isotactic polymer has high crystallinity, high melting point and high mechanical strength.

The polypropylene copolymer is a copolymer of a propylene monomer and an ethylene monomer, and contains the ethylene monomer in an amount of 0.5% to 10% by weight, preferably 1% to 5% by weight, thereby increasing the high mechanical properties of the polypropylene homopolymer. The impact resistance can be greatly improved without significantly reducing the strength.

The weight average molecular weight of the polypropylene resin may be 100,000 to 150,000. By adjusting the weight average molecular weight of the polypropylene resin within the above range, while being advantageous in weight reduction of the material, it is possible to maintain excellent impregnation to the rigid reinforcing material, not only improve the impact strength, but also improve the adhesion between the back surface have. The weight average molecular weight in the present invention is measured using gel permeation chromatography (GPC).

At a temperature of 230 ° C. and a load condition of 2.16 kg, the melt index of the polypropylene resin is 30 g / 10 min to 100 g / 10 min, preferably 60 g / 10 min to 100 g / 10 min. When the melt index of the polypropylene resin is less than 30 g / 10 min, impregnation of the rigid reinforcing material may be lowered, and when the melt index of the polypropylene resin exceeds 100 g / 10 min, the fluidity may increase so much that Impact strength may be lowered.

In the composition of the present invention, the mixed weight ratio (polyamide: polypropylene) of the polyamide resin and the polypropylene resin may be 7: 3 to 9: 1. When the mixing weight ratio is less than 7: 3 (for example, 6: 4), the interfacial bonding strength is weak, and the backside adhesion may be lowered, and the mixing weight ratio is greater than 9: 1 (for example, 9.5: 1), but the interfacial bonding force may be improved, but the elastic modulus is low, the dimensional stability is lowered, and the weight of the material may be disadvantageous.

The thermoplastic resin composite composition for LFT of the present invention is also 0.1 parts by weight to 20 parts by weight of a compatibilizer with respect to 100 parts by weight of the composition in order to improve the interfacial bonding force between the polyamide resin and the polypropylene resin, which is a matrix resin, and the rigid reinforcing material. Preferably 1 to 10 parts by weight, more preferably 3 to 7 parts by weight. The compatibilizer may function as a coupling agent or adhesive between the matrix resin and the rigid reinforcement. In the present invention, by adjusting the content of the compatibilizer in the above range, it is possible to improve the interfacial bonding force between the matrix resin and the rigid reinforcing material to improve the impregnation of the rigid resin of the matrix resin.

As the compatibilizer of the present invention, one or more selected from the group consisting of a furan polymer or a derivative thereof, and a polymer or copolymer comprising a vinyl acetal-containing monomer or a derivative thereof can be used. Preferred examples of the compatibilizer include maleic anhydride graft polypropylene, maleic anhydride graft EPDM (ethylene-propylene-diene terpolymer) rubber or mixtures thereof, and preferably maleic anhydride graft. It may be polypropylene.

The thermoplastic resin composite composition for LFT of the present invention also contains 0.1 to 20 parts by weight of additives, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of the composition, for further improving the performance of the composition.

The additive may be at least one selected from the group consisting of flame retardants, lubricants, antioxidants, light stabilizers, mold release agents, pigments, antistatic agents, metal deactivators, glass fibers, and coupling agents.

The specific types of flame retardants, lubricants, antioxidants, light stabilizers, mold release agents, pigments, antistatic agents, metal deactivators, glass fibers, and coupling agents used as the additives are not particularly limited, and those commonly used in the art may be used. Can be.

The thermoplastic resin composite composition for LFT of the present invention also contains 10 parts by weight to 60 parts by weight, preferably 35 parts by weight to 45 parts by weight, based on 100 parts by weight of the composition. The rigid reinforcing material functions as a component that exhibits the high rigidity of the LFT. The present invention can improve the molding processability while maintaining the high rigidity by adjusting the content of the rigid reinforcing material within the above range.

In order to improve the interfacial bond between the matrix resin and the rigid reinforcement, in addition to the compatibilizer, the rigid reinforcement may be surface treated with a silane-based polymer. The silane polymer surface-treated on the rigid reinforcement may improve the interfacial bonding force between the matrix resin and the rigid reinforcement through chemical bonding with the compatibilizer, specifically covalent bonding.

The silane-based polymer may be at least one selected from the group consisting of polysiloxanes, oligosiloxanes, polysiloxanes substituted with amino groups and oligosiloxanes substituted with amino groups.

As the rigid reinforcing material, long glass fiber (inorganic reinforcing material) or carbon fiber (inorganic reinforcing material) may be used.

When the long glass fiber is used as the rigid reinforcing material, the long glass fiber may contain 1 wt% to 10 wt% of an alkali metal, the long glass fiber may have a diameter of 10 μm to 24 μm, and an elastic modulus of 70 Gpa or more.

In addition, when the carbon fiber is used as the rigid reinforcing material, the carbon fiber is prepared using polyacrylonitrile or silicon carbide as a pitch-based carbon fiber as a precursor, the diameter of the carbon fiber is 5 ㎛ To 20 μm, and the elastic modulus may be 230 Gpa or more.

The thermoplastic resin composite composition for LFT of the present invention may further include 1 part by weight to 10 parts by weight of an adhesion enhancer based on 100 parts by weight of the composition in order to improve adhesion between the back surfaces. In the present invention, by adjusting the content of the adhesion enhancer within the above range, while maintaining excellent impregnation for the rigid reinforcing material, it is possible to improve the adhesion between the back.

The adhesion enhancer may be polybutene or thermoplastic polyurethane (TPU), preferably polybutene, which is easy to control viscosity and may improve impact strength and adhesiveness between back surfaces.

At a temperature of 190 ° C. and a load condition of 2.16 kg, the melt index of the adhesion promoter is between 50 g / 10 min and 100 g / 10 min, preferably between 50 g / 10 min and 80 g / 10 min. When the melt index of the adhesion enhancer is less than 50 g / 10 min, impregnation to the rigid reinforcement may be lowered, and when the melt index of the adhesion reinforcement exceeds 100 g / 10 min, the fluidity is increased so much that the impact strength is rather high. Can be lowered.

When polybutene is used as the adhesion enhancer, the weight average molecular weight of the polybutene may be 800 to 2200, preferably 900 to 1400. By adjusting the weight average molecular weight of the polybutene within the above range, it is possible to improve the impact strength and back-to-back surface adhesiveness while preventing impregnation of the rigid reinforcing material with increasing viscosity of the matrix resin.

The polybutene includes at least one butene monomer selected from the group consisting of 1-butene, 2-butene and isobutene and at least one paraffin monomer selected from the group consisting of isobutane and normal butane, wherein the isobutene The content of may be 30% to 50% by weight. By controlling the content of isobutene in the polybutene within the above range, impregnation and adhesion can be improved at the same time. In addition, derivatives of the polybutenes may also be used as adhesion enhancers.

At least 70% by weight of the total weight of the polybutene may have one double bond, preferably vinylidene per one polybutene molecule. Thereby, the compatibility and adhesiveness of polybutene can be improved.

The present invention also relates to a long fiber reinforced plastic prepared using the thermoplastic resin composite composition for long fiber reinforced plastic (LFT) according to the present invention.

Using the thermoplastic resin composite composition for LFT according to the present invention as a raw material, the LFT can be produced by a draw molding method.

The LFT of the present invention includes all without limitation as long as it is manufactured using the thermoplastic resin composite composition for LFT according to the present invention as a raw material.

 The draw molding method includes conditions and processes commonly used in the art, and the conditions and processes are not particularly limited.

LFT prepared from the thermoplastic resin composite composition for LFT according to the present invention as a raw material is advantageous in weight reduction of the material, but excellent in adhesion with other materials, especially metal or amorphous transparent material, and maintains high impact and high rigidity It can be used as a material for a bonding assembly in which a relatively large number of adhesive portions are present.

In addition, the LFT prepared by using the thermoplastic resin composite composition for LFT according to the present invention may be used as a polymer composite material of automotive interior parts, particularly crash pad core parts or cowl crossmembers, which require high strength physical properties.

1 is a schematic diagram showing the internal coupling structure of the LFT according to the present invention. As shown in FIG. 1, the LFT according to the present invention can improve the interfacial bonding force between the matrix resin and the long glass fiber by including the polyamide resin together with the polypropylene resin in the matrix resin. Specifically, a covalent bond is induced between oxygen of maleic anhydride present in the compatibilizer molecule in the matrix resin and the amine group present in the polyamide molecule, and also treated on the surface of the carbonyl group and the long glass fiber present in the polyamide molecule. It can be confirmed that the interfacial bonding force was improved by inducing additional covalent bonds between the amine groups of the amine-substituted polysiloxanes.

[ Example ]

In the following examples, the present invention will be described in more detail through examples according to the present invention and comparative examples not according to the present invention, but the scope of the present invention is not limited to the following examples.

Example  One

As a polyamide resin, 49.5 parts by weight of polyamide 6 (EN200, manufactured by KP Chemtech) having a relative viscosity of 3 to a sulfuric acid solvent; As a polypropylene resin, 5.5 parts by weight of a polypropylene homopolymer (HA5029, manufactured by PolyMirae) having a melt index of 60 g / 10 min (measured at a temperature of 230 ° C. and a load condition of 2.16 kg) and a weight average molecular weight of 100,000; 4.5 parts by weight of maleic anhydride graft polypropylene (GP090C, manufactured by Hyundai EP) as a compatibilizer; As rigid reinforcing material, 40 parts by weight of long glass fibers (SE-4121, manufactured by Owens Corning) surface-treated with polysiloxane substituted with an amino group; And as an additive, 0.5 parts by weight of antioxidant (ADK-A21B, manufactured by Adeka Korea) was mixed to prepare a thermoplastic resin composite composition for long-fiber reinforced plastic (LFT) by a pultrusion method, which was prepared in pellet form using an extruder. . The prepared pellet was sufficiently dehumidified and then put into an injection molding machine to obtain an LFT specimen for measuring physical properties using an ASTM mold. The weight ratio of the polyamide resin and the polypropylene resin was 9: 1.

Example  2

The polyamide resin content was changed from 49.5 parts by weight to 44 parts by weight, and the polypropylene resin content was changed from 5.5 parts by weight to 11 parts by weight, thereby changing the weight ratio of the polyamide resin and the polypropylene resin to 8: 2. Except for the LFT specimen was obtained in the same manner as in Example 1.

Example  3

By changing the content of the polyamide resin from 49.5 parts by weight to 38.5 parts by weight, and by changing the content of the polypropylene resin from 5.5 parts by weight to 16.5 parts by weight, the weight ratio of the polyamide resin and polypropylene resin to 7: 3 Except for the LFT specimen was obtained in the same manner as in Example 1.

Example  4

Except for changing the content of polyamide resin from 38.5 parts by weight to 34.7 parts by weight, the content of polypropylene resin from 16.5 parts by weight to 14.8 parts by weight, and the content of the compatibilizer is changed from 4.5 parts by weight to 9 parts by weight. An LFT specimen was obtained in the same manner as in Example 3.

Example  5

Except that the type of compatibilizer was changed from maleic anhydride graft polypropylene (GP090C, manufactured by Hyundai EP) to maleic anhydride graft EPDM rubber (KEPA 1130, manufactured by Kumho Polychem) LFT specimens were obtained.

Example  6

Change the content of polyamide resin from 38.5 parts by weight to 34.7 parts by weight, change the content of polypropylene resin from 16.5 parts by weight to 14.8 parts by weight, and change the content and type of compatibilizer from 4.5 parts by weight to 9 parts by weight, respectively, maleic anhydride. An LFT specimen was obtained in the same manner as in Example 3, except that acid graft polypropylene (GP090C, manufactured by Hyundai EP) was changed to maleic anhydride graft EPDM rubber (KEPA1130, manufactured by Kumho Polychem).

Example  7

LFT specimens were obtained in the same manner as in Example 3 except that the type of compatibilizer was changed from maleic anhydride graft polypropylene (GP090C, manufactured by Hyundai EP) to polyurethane (Elastollan soft 50A, manufactured by BASF).

Example  8

Change the content of polyamide resin from 38.5 parts by weight to 34.7 parts by weight, change the content of polypropylene resin from 16.5 parts by weight to 14.8 parts by weight, and change the content and type of compatibilizer from 4.5 parts by weight to 9 parts by weight, respectively, maleic anhydride. An LFT specimen was obtained in the same manner as in Example 3, except that acid graft polypropylene (GP090C, manufactured by Hyundai EP) was changed to polyurethane (Elastollan soft 50A, BASF).

Comparative Example  One

An LFT specimen was obtained in the same manner as in Example 1 except that the polypropylene resin was not used and the content of the polypropylene resin was changed from 5.5 parts by weight to 55 parts by weight.

Comparative Example  2

By changing the content of the polyamide resin from 49.5 parts by weight to 33 parts by weight, and by changing the content of the polypropylene resin from 5.5 parts by weight to 22 parts by weight, the weight ratio of the polyamide resin and polypropylene resin to 6: 4 Except for the LFT specimen was obtained in the same manner as in Example 1.

Test Example

After drying the thermoplastic resin composite composition pellet for long-fiber reinforced plastic (LFT) prepared in Examples 1 to 8 and Comparative Examples 1 and 2 for 2 hours at 90 ℃, using a dehumidifying dryer cylinder temperature 150 ~ 170 ℃, mold An LFT specimen was prepared at a temperature of 50 ° C. The A-type adhesive strength and the B-type adhesive strength of the LFT specimens were measured by the following method, and the results are shown in Tables 1 and 2.

(1) Measurement of Type A Adhesion Strength

As shown in FIG. 3, two LFT specimens having a width × length × height of 20 mm × 13 mm × 2.5 mm were prepared, and the end length of the specimen was placed on the other specimen so that the two specimens were overlapped. 10 mm were overlapped and bonded using a polyurethane adhesive (thickness of 2.5 ± 0.5 mm). Thereafter, the resultant was allowed to stand for 72 hours at a temperature of 40 ° C. and a relative humidity of 50%, and then a force required to peel off the bonded portion, that is, adhesive strength, was measured by applying a force to the bonded portion.

(2) Measurement of type B adhesive strength

As shown in FIG. 4, two LFT specimens having a width × length × height of 25 mm × 19 mm × 3 mm were prepared and one end surface of one specimen was bonded to another so that the end sides of the two specimens were bonded. A polyurethane adhesive (thickness of 2.5 ± 0.5 mm) was attached to the distal side of the. Thereafter, the resultant was allowed to stand for 72 hours at a temperature of 40 ° C. and a relative humidity of 50%, and then the force required to peel off the bonded portion, that is, the adhesive strength, was measured by applying a force to the bonded portion.

Sample compositions and physical property measurement results of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1 below.

division Example Comparative Example One 2 3 One 2

Furtherance Polyamide ^a 49.5 44 38.5 - 33 Polypropylene ^b 5.5 11 16.5 55 22 Compatibilizer ^c 4.5 4.5 4.5 4.5 4.5  Substituted with amino groups With polysiloxane  Surface-treated sheet glass fiber 40 40 40 40 40 additive 0.5 0.5 0.5 0.5 0.5 Properties A-type adhesive strength Mpa ) 131 125 93 20 34 Type B adhesive strength Mpa ) 40 35 23 7 10 Polyamide ^a : Polyamide 6 (EN200, KP Chemtech)
Polypropylene ^b : Polypropylene homopolymer with a melt index of 60 g / 10 min (HA5029, Polyfuture)
Compatibilizer ^c : Maleic anhydride graft polypropylene (GP090C, Hyundai EP)

Specimen composition and physical property measurement results of Examples 3 to 8 are shown in Table 2 below.

division Example 3 4 5 6 7 8 Furtherance Polyamide ^a 38.5 34.7 38.5 34.7 38.5 34.7 Polypropylene ^b 16.5 14.8 16.5 14.8 16.5 14.8 Compatibilizer ^c 4.5 9 - - - - Compatibilizer ^d - - 4.5 9 - - Compatibilizer ^e - - - - 4.5 9  Long Glass Fiber Surface-treated with Amino Group Substituted Polysiloxane 40 40 40 40 40 40 additive 0.5 0.5 0.5 0.5 0.5 0.5 Properties A-type adhesive strength Mpa ) 93 58 85 76 59 58 Type B adhesive strength Mpa ) 23 30 19 25 13 31 Polyamide ^a : Polyamide 6 (EN200, KP Chemtech)
Polypropylene ^b : Polypropylene homopolymer with a melt index of 60 g / 10 min (HA5029, Polyfuture)
Compatibilizer ^c : Maleic anhydride graft polypropylene (GP090C, Hyundai EP)
Compatibilizer ^d : Maleic anhydride graft EPDM rubber (KEPA1130, Kumho Polychem)
Compatibilizer ^e : Polyurethane (Elastollan soft 50A, BASF)

As shown in Table 1, in Examples 1 to 3, by adjusting the weight ratio of the polyamide resin and polypropylene resin to 9: 1 to 7: 3, both the A-type adhesive strength and the B-type adhesive strength is remarkable On the other hand, in Comparative Example 1, since the polyamide resin is not used, the A-type and B-type adhesive strengths are poor, and in Comparative Example 2, the weight ratio of the polyamide resin and the polypropylene resin is 6: It is out of the above range as 4, it can be seen that the A-type adhesive strength and B-type adhesive strength is low.

In addition, as shown in Table 2, in Examples 3 to 8, by maintaining the weight ratio of the polyamide resin and polypropylene resin 7: 3, even if the content or type of the compatibilizer is changed, the A-type adhesive strength And it can be confirmed that the type B adhesive strength can be improved. In particular, it can be seen from Table 2 that the use of maleic anhydride graft polypropylene or maleic anhydride graft EPDM rubber as the compatibilizer is more useful for improving the adhesive strength.

As described above, the thermoplastic resin composite composition for long-fiber reinforced plastics of the present invention contains a polypropylene resin having a melt index of 30 g / 10 min to 100 g / 10 min in a matrix resin together with a polyamide resin having a relative viscosity of 2.5 to 3. By adjusting the weight ratio of the polyamide resin and the polypropylene resin to 7: 3 to 9: 1, it is advantageous to reduce the weight of the material, while improving the impregnation of the rigid resin of the matrix resin, It can improve and maintain high impact and high strength.

1: LFT Specimen 2: Polyurethane Adhesive

Claims (16)

35 to 50 parts by weight of a polyamide resin having a relative viscosity of 2.5 to 3 relative to a sulfuric acid solvent; 5 to 20 parts by weight of polypropylene resin; 0.1 to 20 parts by weight of a compatibilizer; 0.1 to 20 parts by weight of the additive; And 10 to 60 parts by weight of a rigid reinforcing material, the thermoplastic resin composite composition for long fiber reinforced plastic,
The mixed weight ratio of the polyamide resin and the polypropylene resin is 7: 3 to 9: 1,
The thermoplastic resin composite composition for long fiber reinforced plastics whose melt index of the polypropylene resin is 60 g / 10min-100 g / 10min under the temperature of 230 degreeC, and the load condition of 2.16 kg. The method of claim 1,
The thermoplastic resin composite composition for long fiber reinforced plastics whose polyamide resin is crystalline aliphatic polyamide. 3. The method of claim 2,
The crystalline aliphatic polyamide is selected from the group consisting of polyamide 3, polyamide 4, polyamide 6, polyamide 8, polyamide 9, polyamide 11, polyamide 12, polyamide 6,6 and polyamide 6,10 Is at least one thermoplastic resin composite composition for long fiber reinforced plastics. delete The method of claim 1,
The thermoplastic resin composite composition for long fiber reinforced plastics whose polypropylene resin is a polypropylene homopolymer or a polypropylene copolymer. The method of claim 1,
A thermoplastic resin composite composition for long fiber reinforced plastics having a weight average molecular weight of 100,000 to 150,000 of a polypropylene resin. The method of claim 5, wherein
A thermoplastic resin composite composition for long fiber reinforced plastics, wherein the polypropylene copolymer comprises 0.5 to 10 weight percent ethylene monomer. delete The method of claim 1,
A thermoplastic resin composite composition for long fiber reinforced plastics, wherein the compatibilizer is a copolymer comprising a furan polymer or a monomer containing vinyl acetal. The method of claim 9,
A thermoplastic resin composite composition for long fiber reinforced plastics wherein the compatibilizer is maleic anhydride graft polypropylene, maleic anhydride EPDM rubber or a mixture thereof. The method of claim 1,
A thermoplastic resin composite composition for long fiber reinforced plastics, wherein the additive is at least one selected from the group consisting of flame retardants, lubricants, antioxidants, light stabilizers, mold release agents, pigments, antistatic agents, metal deactivators, glass fibers, and coupling agents. The method of claim 1,
The rigid reinforcing material is a thermoplastic resin composite composition for long fiber reinforced plastics is long glass fiber or carbon fiber. The method of claim 1,
A thermoplastic resin composite composition for long fiber reinforced plastics in which a rigid reinforcing material is surface treated with a silane polymer. The method of claim 13,
The silane-based polymer is a thermoplastic resin composite composition for long-fiber reinforced plastics selected from the group consisting of polysiloxanes, oligosiloxanes, polysiloxanes substituted with amino groups and oligosiloxanes substituted with amino groups. The long fiber reinforced plastic manufactured using the thermoplastic resin composite composition for long fiber reinforced plastics of any one of Claims 1-3, 5-7, and 9-14. The method of claim 15,
Long-fiber reinforced plastic used as a core part of crash pads or as a polymer composite material of cowl crossmembers.

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