JP3186858B2 - Liquid crystal resin composite molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a liquid crystal resin composite, and more particularly, to a method for forming a liquid crystal resin composite in which a region where a liquid crystal resin can be fiberized or a region where fiberization is appropriate is a high content region relative to a matrix resin. It relates to a method suitable for molding.

[0002]

2. Description of the Related Art In recent years, the recyclability of a fiber-reinforced plastic composite obtained by adding a glass fiber or carbon fiber reinforcing material to a thermosetting resin or a thermoplastic resin as a synthetic resin composite has become a problem. There has been proposed a liquid crystal resin composite as disclosed in
No. 320128). However, since liquid crystal resins are expensive, the present situation is that the cost cannot be inferior to conventional fiber reinforced plastics unless sufficient structural reinforcement properties are obtained with a relatively small amount of the matrix resin.

[0003]

When a composite is formed by using these liquid crystal resins, as shown in FIG. 1, both of them are heated to a temperature higher than the melting point of the liquid crystal resin (region (c)) and once melted. And mixing at a moldable temperature (region (b)) below the melting point of the liquid crystal resin, a room temperature region ((a)
In the region, the fibers of the liquid crystal resin are oriented in the molding direction in the matrix resin to obtain predetermined physical properties. However,
As shown in FIG. 2, the proper area where the liquid crystal resin is fiberized in the matrix resin after the extrusion molding is located between the non-fiberizable area and the phase inversion area. It has been found that there is a case where the liquid crystal resin is present in a region, and when a relatively small amount of the liquid crystal resin is blended, the liquid crystal resin is not formed into a fiber within the matrix resin, and thus the predetermined physical properties cannot be obtained. here,
Phase inversion means two-component L (liquid crystal resin) macroscopically separated,
M (matrix resin) is changed from L in M type to M in
It means that the phase is reversed to the L-shape or the opposite direction, and the fibrillable region is a region where the liquid crystal resin has an aspect ratio of 3 or more after molding. Therefore, the present invention provides a molding method in which a relatively small amount of liquid crystal resin is fiberized into a matrix resin and dispersed and molded even when the fiberizable region or the appropriate fiberization region of the liquid crystal resin is in the high content region. Aim.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a matrix resin comprising a thermoplastic resin and a reinforcing material having a liquid crystal transition temperature higher than a moldable temperature of the thermoplastic resin .
Use a composition comprising a liquid crystal resin, said Mato
In forming a liquid crystal resin composite in which the liquid crystal resin is fiberized and dispersed in the resin mixture, the liquid crystal resin component is a matrix resin and the liquid crystal resin is a matrix resin.
Into fiber with aspect ratio of 3 or more inside
The amount of available area and the liquid crystal resin on the matrix side
The mixture is melt-extruded at a moldable temperature of the matrix resin equal to or higher than the liquid crystal transition temperature to obtain a composite in which the liquid crystal resin is fiberized and dispersed in the matrix resin. Matrix resin
For the liquid crystal resin, it may deviate from the fiberable area amount
And the mixture is added to the mixture at a temperature lower than the liquid crystal transition temperature.
The present invention relates to a method for molding a liquid crystal resin composite molded at a moldable temperature of a matrix resin .

In the present invention, the liquid crystal resin component may be a liquid crystal resin alone or may be added in the form of a composite with a matrix resin containing a high content of liquid crystal resin.

[0006] When the molded article formed by the above method is regenerated, the crushed pieces are used, but the content of the liquid crystal resin in the crushed pieces is not in the region where the fiber can be formed. Accordingly, the present invention provides a liquid crystal device in which
Resin is 3 or more in matrix resin
Upon re-forming a used molded article comprising a liquid crystal resin composite having a content of less than the fiberizable region amount to be in a fibrous state , the liquid crystal resin component as a whole composition in a crushed piece of the used molded article, In the above fibrillable area amount and above
The liquid crystal resin is less than the phase inversion amount on the matrix side, additionally adjusted and blended, and this mixture is melt-extruded at a moldable temperature of the matrix resin equal to or higher than the liquid crystal transition temperature, and the liquid crystal resin is fiberized and dispersed in the matrix resin. And a matrix resin is added to the composite by the liquid crystal.
Added to the resin in an amount that can deviate from the above fiberizable area
Then, the mixture is heated to a temperature lower than the liquid crystal transition temperature.
It is intended to provide a method of molding at a moldable temperature of the resin .

The region where the liquid crystal resin can be formed into fibers varies depending on the type of the matrix resin. For example, when the matrix resin is a polyamide resin represented by nylon, as shown in FIGS. 4 and 5, 50 to 70% by weight, and when the matrix resin is an ABS (acrylonitrile-butadiene-styrene copolymer) resin, FIG. As shown in FIG. 7, the matrix resin is only in the high content region of 40 to 70% by weight, whereas the matrix resin is polycarbonate (PC) / A
3 to 70% by weight for BS resin, 2 to 65% by weight for polyphenylene oxide / nylon, 3 to 60% by weight for modified polyphenylene oxide, 2 to 75% by weight for polypropylene, and 2 to 75% by weight for polycarbonate There is a wide range from 3 to 70% by weight, from the high content region to the low content region, where liquid crystal resin fibers can be formed. However, in the vicinity of these lower limits, most liquid crystal resins may have a grain shape with an aspect ratio of 3 or less, Also in these cases, the melt extrusion for forming the liquid crystal resin fibers is preferably performed in a region where the liquid crystal resin content is relatively high. for that reason,
In the latter case, in consideration of the obtained physical properties such as the tensile strength and the flow length ratio, it is possible to select a preferable fiberizable region (fiberization suitable region) in the fiberizable region. That is, the matrix resin is PC / AB
In the case of the S resin, the liquid crystal resin is preferably 3 to 70% by weight as shown in FIGS. 8 and 9. In the case of the PPO / PA6 resin, as shown in FIGS.
0 to 65% by weight is preferable. In the case of the modified PPO resin, as shown in FIGS.
14 and FIG. 1 in the case of PP resin.
As shown in FIG. 5, the content of the liquid crystal resin is preferably 40 to 70% by weight.
-20% by weight, and in the case of PBT resin, as shown in FIGS. 17 and 18, the liquid crystal resin is 30-70% by weight.
In the case of a PC / PBT resin, the content of the liquid crystal resin is preferably 2 to 60% by weight as shown in FIGS.

The physical properties of the ABS resin as the above matrix resin are not particularly limited. The matrix resin is commercially available. Specifically, commercially available products include, for example, Clastic MH (manufactured by Sumitomo Nogatack Co., Ltd.), Psycholac T (manufactured by Ube Sycon Co., Ltd.) and GR-20.
00 (manufactured by Denki Kagaku Kogyo KK). The physical properties of nylon, which is a matrix resin used in the resin composition of the present invention, are not particularly limited, but nylon-6 is particularly preferred. The above matrix resin is
It is available as a commercial product. Specifically, as a commercial product,
For example, 1013B (manufactured by Ube Industries, Ltd.), CM1017
(Manufactured by Toray Industries, Inc.) and Technil C216 (Showa Denko
Co., Ltd.). As other matrix resins, commercially available resins can be used. PC / ABS
In the case of resin, Techniace T105 (manufactured by Sumitomo Nogatack Co., Ltd.), T-2600 (manufactured by Teijin Chemicals Limited), and Psychoroy 800 (manufactured by Ube Sycon Co., Ltd.) can be used.
In the case of the above PPO / PA6 resin, Noryl GTX6006
(Nippon GE Plastics Co., Ltd.), Iupiace NX-7000 (Mitsubishi Gas Chemical Co., Ltd.), PPA26
3 (manufactured by Toray Industries, Inc.) can be used. In the case of a modified PPO resin, Noryl PX2623 (manufactured by Nippon GE Plastics Co., Ltd.), Iupiace AN30 (Mitsubishi Gas Chemical Co., Ltd.)
And Xylon X5055 (manufactured by Asahi Kasei Corporation). In the case of PP resin, H501 (Sumitomo Chemical Co., Ltd.)
J440 (manufactured by Mitsui Petrochemical Industries, Ltd.), J95
0H (made by Idemitsu Petrochemical Industry Co., Ltd.) can be used. PC
In the case of resin, 141 (manufactured by Nippon GE Plastics Co., Ltd.) and Panlite L1250 (Teijin Kasei Co., Ltd.)
Manufactured), Iupilon S-1000 (manufactured by Mitsubishi Gas Chemical Co., Ltd.)
Can be used. 1401XO7 for PBT resin
(Manufactured by Toray Industries, Inc.), C7000 (manufactured by Teijin Limited), Plastic BT-100 (manufactured by Dainippon Ink and Chemicals, Inc.)
Made) can be used. When the liquid crystal resin is PC / PBT resin, XENOY 1101 (GEPlastics Japan)
AM-9060 (manufactured by Teijin Chemicals Ltd.).

[0009] The composite material of the present invention contains a liquid crystal resin.
The liquid crystal resin has a fiber shape having an aspect ratio described later in a molded product of the resin composition, and serves as a reinforcing material for the molded product. As such a liquid crystal resin, one having a liquid crystal transition temperature higher than the moldable temperature of the matrix resin, preferably higher than 20 ° C. may be selected. If the liquid crystal transition temperature is lower than the moldable temperature of the matrix resin, the liquid crystal resin does not become fibrous in the molded product, the orientation is not constant, and sufficient strength cannot be obtained. Various conventionally known liquid crystal resins can be applied and are not particularly limited. Various types of liquid crystal resins are known, and particularly preferably used in the present invention are thermoplastic liquid crystal polyesters and liquid crystal polyesteramides. Particularly preferred examples of such a material include those described below. That is,

[0010]

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[0011]

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[0012]

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[0013]

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[0014]

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Here, Δni = 100. It is particularly preferable that ni of each structural formula is 4 or more. In each formula, various substituents such as halogen may be added. These are particularly preferable because they are easily melt-molded with the modified polyester of the present invention. Moreover, it is easy to make a composite fiber having high strength and high elastic modulus. Similarly, conventionally known liquid crystal polyesteramides can be applied, and there is no particular limitation. Particularly preferred are those represented by the following structural formulas.
That is,

[0016]

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[0017]

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[0018]

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Here, Δni = 100 in each structural formula. It is particularly preferable that ni of each structural formula is 15 or more. Further, in each formula, various substituents such as halogen may be added. These compounds have melt moldability and high strength similarly to the liquid crystal polymer composed of polyarylate. As long as the resin composition of the present invention does not prevent fiber formation of the liquid crystal resin, other additives such as a light stabilizer, an antioxidant, and a plasticizer may be added. In particular, a compatibilizer for improving the bonding strength between the matrix resin phase and the liquid crystal resin fiber phase may be added.
As the compatibilizer, the matrix resin is an ABS resin,
In the case of a polystyrene resin, a polycarbonate resin, or a polyphenylene oxide resin, those resins modified with a compound having an epoxy group and / or an acid anhydride, for example, EGMA-g-AS, acid anhydride modified polystyrene, N-substituted maleimide copolymer In the case of a polyolefin resin, those obtained by modifying a polyolefin resin with a compound having an epoxy group and / or an acid anhydride, for example, EGMA,
EGMA-g-olefin is preferable, and in the case of polyester resin, polyarylate resin or polyamide resin, a compound having two or more epoxy groups, carboxyl groups, oxazolinyl groups, amino groups, etc., for example, EGMA, epoxy resin, acid anhydride modification Polyester and the like are preferred.

In the molding method of the present invention, the resin composition containing the liquid crystal resin in the appropriate fiberization region is once heated to a molten state, that is, a temperature higher than the melting point of the liquid crystalline polymer, to give the polymer molecules an orientation. It is molded or made into a molding material in the state. The state of imparting orientation to the polymer molecule is generally given by a method such as extrusion molding, injection molding or the like. By directly molding in this manner, a molded article having high orientation (molecular orientation) may be obtained. However, usually, after extrusion molding, it is made into a pellet-like molding material. The molding material may be melted and molded again using an extruder, an injection molding machine, or the like. It is preferable that the re-melting temperature be higher than the melting point of the matrix resin and lower than the melting point of the liquid crystal polymer, since the liquid crystal resin maintains a fibrous state. The fibrous liquid crystalline polymer composited in the molded article has an aspect ratio (that is, length / thickness).
It has 3 or more, preferably 10 or more. Aspect ratio is 3
If it is less than 10, there is no anisotropy with respect to the strength of the molded product, and a large strength cannot be obtained in the orientation direction. In order to manufacture a composite material or a product containing liquid crystal resin fibers having an aspect ratio of 3 or more, the shear rate of the extruded resin composition is 3 × 10 ² to
10 ⁵ sec ⁻¹ , preferably 3 × 10 ² to 10 ⁴ sec ⁻¹
Range is good. Further, the obtained composite is preferably stretched. This is because the tensile strength of the liquid crystal resin composite is improved by stretching.

[0021]

According to the present invention, the resin composition in which the liquid crystal resin is fibrillated and the matrix resin are mixed and molded. Therefore, even when the content of the liquid crystal resin is not in the region where fiberization is possible or in the region suitable for fiberization. The fibrous liquid crystal resin is distributed to the matrix resin of the molded product, and desired physical properties can be obtained. Also, as shown in FIG. 3, when the molded article made of the liquid crystal resin composite is reused, the recovered material generally has a liquid crystal resin content not in the region where fiberization is possible or in the region where fiberization is appropriate. A plastic is appropriately added to adjust to a proper fiberization region. This is melt-extruded, stretched after cooling, and a liquid crystal resin is fiberized to obtain a composite material (strand) dispersed in a matrix resin. By mixing this with the existing plastic to make the liquid crystal resin content below the fiberizable region or the proper fiberization region and performing molding such as injection molding, the liquid crystal resin is dispersed in the molded product in a fibrous state. Will be. Therefore,
Also at the time of reuse, the liquid crystal resin can be fiberized and dispersed in the molded product.

[0022]

The present invention will be described below in more detail with reference to examples. Example 1 First, Vectra A950 (aromatic polyester, liquid crystal transition temperature: about 280 ° C.) manufactured by Polyplastics Co., Ltd. was used as a liquid crystal resin, and 1013B manufactured by Ube Industries, Ltd. was used as nylon-6. The two were mixed at a predetermined ratio to obtain a liquid crystal resin composite material. Next, the liquid crystal resin composite material was initially extruded. The extrusion conditions in this case were as follows: a twin screw extruder (screw diameter: 30 mm, manufactured by Plastics Engineering Laboratory Co., Ltd.) was used as the extruder, the resin temperature was 290 ° C., the screw rotation speed was 100 rpm, and the die diameter was 2 mm. The shear rate was set to 1700 sec -1 and the stretching ratio was set to 2. Then, the above liquid crystal resin composite was extruded while being stretched, and was used for the initial forming of a 1.4 mm diameter strand for testing. After obtaining the raw material, a part of the raw material for initial molding was cut into a length: 3 mm to obtain an initial pellet material, which was then injection molded to obtain a liquid crystal resin composite. The injection molding conditions in this case were as follows: a 220 Ton injection molding machine manufactured by Toshiba Machine Co., Ltd. and a test piece mold were used, and the resin temperature was set to 250 ° C.
In this case, using the above-described injection molding machine and a mold of a spiral flow type (semicircle having a diameter of 6 mm), and setting the resin temperature to 2
A fluidity evaluation test was performed at 50 ° C. and an injection pressure of 1000 kg / cm ² .

Next, the liquid crystal resin composite was pulverized with a pulverizer of V-360 manufactured by Horai Co., Ltd., and the length was 3 to 4 mm.
After obtaining the crushed pieces of the above, the crushed pieces are recycled and extruded to obtain a strand-shaped recycle molding material having a diameter of 1.4 mm for a test. It was cut into 3 mm to obtain a recycled pellet material. The extrusion molding conditions in this case were the same as in the case of the initial extrusion molding. Next, a tensile test was performed on the strand-shaped initial molding material and the recycled molding material. A universal testing machine (Autograph) manufactured by Shimadzu Corporation was used as a measuring machine, and the tensile speed was set to 20 mm / min. FIG. 4 shows the results of a tensile test performed on the material for initial molding and the material for recycling molding. In a region where the content of the liquid crystal resin exceeds 40%, the liquid crystal resin becomes fibrous and the liquid crystal resin content is increased. It was confirmed that the tensile strengths of the two were substantially the same over the entire amount range, that is, the strength did not decrease even though the high-strength synthetic resin was re-formed by the above-mentioned re-forming method. FIG. 5 shows the relationship between the liquid crystal resin content and the flow length ratio. When the liquid crystal resin content exceeds 80%, the fluidity was extremely reduced, and it was revealed that it was difficult to use as a molding material. . From the above considerations, when nylon-6 (PA6) is used as the thermoplastic resin, the content of the liquid crystal resin is preferably in the range of 50 to 70%. When the morphological observation of the material for initial molding and the material for recycling molding was performed by an electron microscope (SEM), when the content of the liquid crystal resin was 40%, most of the liquid crystal resin was granular, and a part of the liquid crystal resin was fiber. It was. When the content of the liquid crystal resin was 50%, the liquid crystal resin was fibrous. From this result, it can be understood that when the content of the liquid crystal resin is 40% or more, the liquid crystal resin is fiberized and the tensile strength is improved.

Therefore, a material having a liquid crystal resin content of 70% was prepared (sample A), and the matrix resin P required for this was prepared.
Injection molding was performed by adding A6 so that the content of the liquid crystal resin became 30% (sample B). Thereafter, the product was pulverized, a liquid crystal resin was added, and a liquid crystal resin content of a blend of the pulverized product and the new liquid crystal resin was set to 70%, and the material was adjusted in the same manner as the above initial conditions (sample C). . PA6 was added to this material so that the liquid crystal resin content became 30%, and injection molding was performed under the same conditions as the initial stage (sample D). The tensile strength of each sample was measured in the same manner as above, and the results are shown below. Table Sample ABCD Tensile strength 180MPa 75MP 170MPa 73MPa (Strand) (Molded product) (Strand) (Molded product) Also, the tensile strength of the strand when directly adjusting the composite material containing 30% of liquid crystal resin by melt extrusion Was 35 MPa. This seems to be because the region where the liquid crystal resin content is 30% is outside the region where the fiberization is possible, and the fiberization of the liquid crystal resin is not performed in the matrix resin. On the other hand, although the strand and the molded product molded by the method of the present invention have the liquid crystal resin content outside the fiberizable region as a whole, the fiberized liquid crystal resin is dispersed in the matrix resin, and the tensile strength is increased. Have been obtained. Example 2 First, Vectra A950 (aromatic polyester, liquid crystal transition temperature: about 280 ° C.) manufactured by Polyplastics Co., Ltd. was used as a liquid crystal resin, and CLASTIC MH manufactured by Sumitomo Dow was used as an ABS resin. The mixture was mixed at a ratio of 60% by weight of a liquid crystal resin and 40% by weight of a matrix resin to obtain a liquid crystal resin composite material. Next, the liquid crystal resin composite material was initially extruded under the same conditions as in Example 1. The necessary matrix resin ABS resin was added to the composite material (sample E) having a liquid crystal resin content of 60%, and injection molding was performed so that the liquid crystal resin content became 20% (sample F). Thereafter, the product was pulverized, a liquid crystal resin was added, and the liquid crystal resin content of the blend of the pulverized product and the new liquid crystal resin was adjusted to 60%, and the material was adjusted in the same manner as the above initial conditions (sample G). . This material has a liquid crystal resin content of 2
An ABS resin was added so as to be 0%, and injection molding was performed under the same conditions as the initial stage (sample H). The tensile strength of each sample was measured in the same manner as above, and the results are shown below. Table Sample EFGH Tensile strength 154MPa 63MP 148MPa 60MPa (Strand) (Molded product) (Strand) (Molded product) Also, the tensile strength of the strand when the composite material containing 20% of the liquid crystal resin is directly adjusted by melt extrusion. Was 50 MPa. This seems to be because the region where the liquid crystal resin content is 20% is outside the region where the fiberization is possible, and the fiberization of the liquid crystal resin is not performed in the matrix resin. On the other hand, although the strand and the molded product molded by the method of the present invention have the liquid crystal resin content outside the fiberizable region as a whole, the fiberized liquid crystal resin is dispersed in the matrix resin, and the tensile strength is increased. Have been obtained. Example 3 First, Vectra A950 (aromatic polyester, liquid crystal transition temperature: about 280 ° C.) manufactured by Polyplastics Co., Ltd. was used as a liquid crystal resin, and Nippon GE Plastics Co., Ltd. was used as a PPO / PA6 resin. The liquid crystal resin composite material was obtained by using Noryl GTX6006 manufactured by Nissan Co., Ltd., and mixing them at a ratio of 40% by weight of liquid crystal resin and 60% by weight of matrix resin. Next, the liquid crystal resin composite material was initially extruded under the same conditions as in Example 1. The required matrix resin PPO / PA6 resin was added to the composite material (sample I) having a liquid crystal resin content of 40% to obtain a liquid crystal resin content of 10%.
% (Sample J). Thereafter, the product was pulverized, a liquid crystal resin was added, and the liquid crystal resin content of the blend of the pulverized product and the new liquid crystal resin was adjusted to 40%, and the material was adjusted in the same manner as the above initial conditions (sample K). . PPO / PA6 resin was added to this material so that the content of the liquid crystal resin became 10%, and injection molding was performed under the same conditions as the initial stage (sample L). The tensile strength of each sample was measured in the same manner as above, and the results are shown below. Table Sample IJKL Tensile strength 110MPa 54MP 105MPa 52MPa (Strand) (Molded product) (Strand) (Molded product) In addition, the tensile strength of the strand when directly adjusting the composite material containing 10% of liquid crystal resin by melt extrusion. Was 40 MPa. This is probably because the region where the liquid crystal resin content is 10% is outside the region suitable for fiberization, and the fiberization of the liquid crystal resin is not performed in the matrix resin. On the other hand, in the strand and the molded product molded by the method of the present invention, the fibrous liquid crystal resin is dispersed in the matrix resin even though the liquid crystal resin content is out of the proper fiberization region as a whole, and the tensile strength is increased. Have been obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a change in state between a matrix resin and a reinforcing material (liquid crystal resin) of a liquid crystal resin composite material.

FIG. 2 is a diagram showing a state change of a composite material exerted by a content of a liquid crystal resin with respect to a matrix resin in the liquid crystal resin composite material.

FIG. 3 is a process chart showing an example of a molding method according to the present invention.

FIG. 4 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is PA6 resin.

FIG. 5 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained in an example in which the matrix resin is a PA6 resin.

FIG. 6 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is an ABS resin.

FIG. 7 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is an ABS resin.

FIG. 8 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained by an example in which the matrix resin is a PC / ABS resin.

FIG. 9 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is a PC / ABS resin.

FIG. 10 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is a PPO / PA6 resin.

FIG. 11 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is a PPO / PA6 resin.

FIG. 12 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is a modified PPO resin.

FIG. 13 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is a modified PPO resin.

FIG. 14 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in Examples in which the matrix resin was a PP resin.

FIG. 15 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is a PP resin.

FIG. 16 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is a PC resin.

FIG. 17 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained by an example in which the matrix resin is a PBT resin.

FIG. 18 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example in which the matrix resin is a PBT resin.

FIG. 19 is a graph showing the results of a tensile test on an initial molding material and a recycled molding material obtained in an example in which the matrix resin is a PC / PBT resin.

FIG. 20 is a graph showing a liquid crystal resin content and a flow length ratio in a molded product obtained by an example when the matrix resin is a PC / PBT resin.

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29B 15/08 B29B 11/16 C08J 3/20 C08L 1/00-101/16

Claims (9)

(57) [Claims] 1. A matrix resin comprising a thermoplastic resin.
And a liquid crystal resin as a reinforcing material having a liquid crystal transition temperature higher than the moldable temperature of the thermoplastic resin.
In forming a liquid crystal resin composite in which the fibers are dispersed into fibers, the liquid crystal resin component is mixed with the matrix resin to form the liquid crystal.
Resin is 3 or more in matrix resin
The amount of fiber that can be converted into a fiber state
Fat is blended less than the amount of phase inversion on the matrix side, and this mixture is melt-extruded at a moldable temperature of the matrix resin equal to or higher than the liquid crystal transition temperature to obtain a composite in which the liquid crystal resin is fiberized and dispersed in the matrix resin. A matrix resin in the composite, a liquid crystal resin, and the fiber
The amount that can deviate from the amount of
Moldable temperature of the matrix resin below the liquid crystal transition temperature
A method for molding a liquid crystal resin composite, comprising: 2. The method according to claim 1, wherein the liquid crystal resin component is compatible with the matrix resin.
As a result, the liquid crystal resin
Less than the amount of fiberizable area that becomes a fiber state with an
In re-forming a used molded article comprising a liquid crystal resin composite having a content , the liquid crystal resin component as a whole composition in a crushed piece of the used molded article, in the above fibrillable area amount, And the above liquid crystal resin
Is less than the phase inversion amount on the matrix side, additionally adjusted and blended, and this mixture is melt-extruded at a moldable temperature of the matrix resin equal to or higher than the liquid crystal transition temperature, and the liquid crystal resin is fiberized and dispersed in the matrix resin. And a matrix resin is added to the composite with the liquid crystal resin.
Then, an amount that can deviate from the above-mentioned fiberizable area amount is added, and
The mixture is mixed with the matrix resin below the liquid crystal transition temperature.
A method for molding a liquid crystal resin composite, characterized in that the molding is performed at a moldable temperature . 3. The matrix resin is a polyamide resin, the liquid crystal resin has a fibrillable region amount of 50 to 70% by weight of the resin composite, and the final composite product has a fiber-forming liquid crystal resin content of 50% by weight. 3. The molding method according to claim 1, wherein the amount is less than % by weight. Wherein said matrix resin is a ABS resin, 40 to 70 wt% of the fiberizing area weight resin composite of the liquid crystal resin, the fiber-forming liquid crystal polymer content of the final composite product 40 3. The molding method according to claim 1, wherein the amount is less than % by weight. 5. The liquid crystal resin according to claim 5, wherein the matrix resin is a polycarbonate (PC) / ABS resin, and the liquid crystal resin has a fiberizable area of 3 to 70% by weight of the resin composite. The molding method according to claim 1 or 2, wherein the resin content is less than 3% by weight. 6. A resin composite according to claim 1, wherein said matrix resin is polyphenyl oxide (PPO) / PA6 (nylon) resin, and said liquid crystal resin has a fiber- forming area of 2 %.
The molding method according to claim 1 or 2, wherein the fiber composite liquid crystal resin content of the final composite product is less than 2 % by weight. 7. The matrix resin is a modified polyphenyl oxide (PPO) resin, wherein the liquid crystal resin has a fiberizable region amount of 3 to 60% by weight of the resin composite, and fiber formation of a final composite product is performed. 3. The molding method according to claim 1, wherein the liquid crystal resin content is less than 3 % by weight. 8. A region in which the matrix resin is a polypropylene (PP) resin and the liquid crystal resin is capable of forming fibers.
The molding method according to claim 1 or 2, wherein the amount is 2 to 75 % by weight of the resin composite, and the content of the fiber-forming liquid crystal resin in the final composite product is less than 2 % by weight. 9. The matrix resin is a polycarbonate (PC) resin, fiberizable territory of the liquid crystal resin
The molding method according to claim 1 or 2, wherein the area amount is 3 to 70 % by weight of the resin composite, and the content of the fiber-forming liquid crystal resin in the final composite product is less than 3% by weight.