KR101155073B1 - Manufacturing method of fiber glass reinforced plastics material using the unsaturated polyester resin comprising carbon nanotube - Google Patents

Abstract

The present invention relates to a method for producing a glass fiber reinforced plastic using an unsaturated polyester resin containing carbon nanotubes, and more particularly, to preparing a carbon nanotube dispersion, mixing a saturated acid and an unsaturated acid, Heating and stirring the mixture of the unsaturated acid and the carbon nanotube dispersion, adding a polymerization inhibitor to the compound prepared by heating and stirring to prepare an unsaturated polyester resin by adding a styrene monomer, and applying an unsaturated polyester resin. By laminating and impregnating the glass fiber on the coated upper surface, and curing the unsaturated polyester resin impregnated with the glass fiber, it is possible to provide a glass fiber reinforced plastic having electrical conductivity and improved mechanical strength.

Description

Manufacturing Method of Fiber Glass Reinforced Plastics Material Using the Unsaturated Polyester Resin Comprising Carbon Nanotube}

The present invention relates to a method for producing a glass fiber reinforced plastic having electrical conductivity using an unsaturated polyester resin containing carbon nanotubes and further improving mechanical strength.

In general, Fiber Reinforced Plastics refers to plastics having excellent mechanical strength and heat resistance by using reinforcing materials such as fibers, and fiber reinforced resins and reinforced plastics. Also called.

As the reinforcing material of the fiber-reinforced plastic, glass fibers, carbon fibers and aromatic nylon fibers called Kevlar (trade name DuPont, USA) are used, but glass fibers are preferably used for excellent mechanical strength. Moreover, it is preferable to use thermosetting resins, such as unsaturated polyester and an epoxy resin, as plastic.

Glass-fiber reinforced plastics have excellent resistance to corrosion of acids, alkalis, salts, solvents, etc., and are excellent in corrosion resistance, and are semi-permanent materials that are lighter than aluminum and have better corrosion, heat and corrosion resistance. It is widely used in the process of each industrial field in advanced industrial countries of the United States, Japan and Europe.

Glass fiber reinforced plastics with excellent heat resistance, water resistance, corrosion resistance, and corrosion resistance are used in modern industrial fields such as construction, petrochemical, leisure, automobile industry, and environmental business as well as high-tech industries of the 21st century. In addition, it is used for back box, ancient architectural pillar, ceiling DENjo, relief, signboard, frame, trash can, chair, table, fountain, statue, rock, artificial waterfall, exterior panel in relation to interior and exterior decoration, and shape sculpture in relation to landscape. It is used for various sculptures.

In order to apply such glass fiber reinforced plastics in more various places, there is a need for glass fiber reinforced plastics having electrical conductivity and having improved mechanical strength.

An object of the present invention is to provide a method for producing a glass fiber reinforced plastic containing carbon nanotubes and having electrical conductivity.

In addition, another object of the present invention is to provide a method for producing a glass fiber reinforced plastic having improved mechanical strength than conventional glass fiber reinforced plastics.

1. preparing a carbon nanotube dispersion by mixing and dispersing 0.6 to 20 parts by weight of carbon nanotubes to 100 parts by weight of one or more glycols selected from the group consisting of polyethylene glycol, propylene glycol and neopentyl glycol; Preparing an acid mixture for mixing with the carbon nanotube dispersion by mixing saturated and unsaturated acids; Mixing the carbon nanotube dispersion and the acid mixture in an equivalent ratio of 1.00 to 1.05: 1 and stirring the mixture at 150 to 170 ° C. for 50 to 70 minutes, followed by heating and stirring at 200 to 210 ° C. for 150 to 200 minutes; Preparing an unsaturated polyester resin by adding a polymerization inhibitor to the intermediate prepared by heating and stirring, and then mixing the intermediate and styrene monomer in a weight ratio of 50:50 to 70:30; And impregnating the unsaturated polyester resin with the glass fiber.

2. In the above 1, the step of impregnating the unsaturated polyester resin and the glass fiber is a step of applying the unsaturated polyester resin to which the accelerator and the curing agent is added and laminated the glass fiber thereon to impregnate with a roller; And curing the glass fiber impregnated unsaturated polyester resin at 15 to 35 ° C. for 6 to 12 hours to cure.

3. In the above 1, the styrene monomer is a glass fiber reinforced plastic manufacturing method that will include 1 to 3 parts by weight of carbon nanotubes based on 100 parts by weight of styrene monomer.

4. In the above 1 or 3, the carbon nanotubes have an average diameter of less than 100 nm glass fiber reinforced plastic manufacturing method.

5. In the above 1 or 3, the carbon nanotubes have an average length of less than 1,000 ㎛ glass fiber reinforced plastic manufacturing method.

6. according to the above 1, a method for producing glass fiber reinforced plastic using ultrasonic dispersion or ball milling method to disperse carbon nanotubes in glycol.

7. In the above 1, when the saturated acid and unsaturated acid when the equivalent ratio of saturated acid and unsaturated acid is 1: 1 to 3 manufacturing method of glass fiber reinforced plastic.

8. The method according to the above 1, wherein the saturated acid is selected from the group consisting of phthalic anhydride, phthalic acid and isophthalic acid.

9. The method according to the above 1, wherein the unsaturated acid is selected from the group consisting of maleic anhydride, fumaric acid and itaconic acid.

10. In the above 1, the carbon nanotube dispersion mixed with the acid mixture is selected from carbon nanotube dispersion made of polyethylene glycol, carbon nanotube dispersion made of propylene glycol and carbon nanotube dispersion made of neopentyl glycol Method for producing a glass fiber reinforced plastic that is a mixture of more than one species.

11. In the above 2, after the curing step of 100 ~ 250 minutes at 110 ~ 120 ℃ added step of producing a glass fiber reinforced plastic.

The glass fiber reinforced plastics of the present invention have electrical conductivity, including carbon nanotubes, and mechanical strengths such as tensile strength and flexural strength are improved compared to conventional glass fiber reinforced plastics, and thus can be variously applied.

In particular, the glass fiber reinforced plastic of the present invention can be applied to the bus cargo door (luggage door), ship engine valve cover, dust collector exterior material, barn heat floor material, etc. because the current flows smoothly.

1 is a flowchart illustrating a method of manufacturing glass fiber reinforced plastic according to an embodiment of the present invention.

The present invention comprises the steps of preparing a carbon nanotube dispersion, preparing an acid mixture, heating and stirring the acid mixture and the carbon nanotube dispersion, adding a polymerization inhibitor to the intermediate prepared by heating and stirring to add a styrene monomer Preparing an unsaturated polyester resin, coating the unsaturated polyester resin and impregnating the glass fiber on the coated upper surface, and curing the unsaturated polyester resin impregnated with the glass fiber. It relates to a method of manufacturing a glass fiber reinforced plastic containing.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention provides a method of manufacturing glass fiber reinforced plastics (FRP) using unsaturated polyester resins prepared to include carbon nanotubes as shown in FIG. 1.

First, dispersing carbon nanotubes in glycol to prepare a carbon nanotube dispersion (S110).

The carbon nanotube dispersion is dispersed by including 0.6 to 20 parts by weight of carbon nanotubes (CNT) based on 100 parts by weight of glycol. When the content of carbon nanotubes is less than 0.6 parts by weight, glass fiber reinforced plastics do not have electrical conductivity, and when the content is more than 20 parts by weight, carbon nanotubes cannot be dispersed.

The carbon nanotube dispersion is prepared by ultrasonic dispersion or ball milling for uniform dispersion of carbon nanotubes, and preferably by ultrasonic dispersion. The carbon nanotube dispersion has a frequency of 10 to 60 depending on the capacity of the carbon nanotubes and the amount of glycol. It is applied for 10 to 100 minutes with an ultrasonic disperser having a KHz and a power of 100 to 700 W so that carbon nanotubes are uniformly dispersed in glycol.

The glycol may be polyethylene glycol, propylene glycol or neopentyl glycol, and the like, and as carbon nanotubes (CNT), acid-treated carbon nanotubes or acid-free carbon nanotubes may be used. In this case, the acid-treated carbon nanotubes are acid-treated to the extent that they do not damage the carbon nanotubes.

Carbon nanotubes are a kind of carbon nanofibers, and a six-membered ring network made of carbon consists of a single layer or a multilayer coaxial tube.

The average diameter of the carbon nanotubes used in the present invention is 100 nm or less, preferably 0.7 to 100 nm, the average length is 1,000 μm or less, preferably 2 nm to 1,000 μm, multi-walled, double-walled or single-walled structure. Can be used alone or in combination of two or more.

If the average diameter of the carbon nanotubes is more than 100 nm, the dispersibility with the glycol is lowered, the unsaturated polyester resin and the carbon nanotubes may be separated from each other or the carbon nanotubes may be gathered in one place in the course of the subsequent process. .

In addition, when the average length of the carbon nanotubes are more than 1,000 μm, there is a problem that the dispersibility with glycol is lowered.

Apart from the carbon nanotube dispersion prepared as described above, an acid mixture is prepared by mixing saturated acid and unsaturated acid in an equivalence ratio of 1 to 3 (S120).

When unsaturated acid is used alone, the glass fiber-reinforced plastic produced may be easily broken or cracks may occur due to a rapid exothermic reaction, and strong shrinkage may occur, and therefore, it is preferable to use it with a saturated acid. In the case of using an acid mixed solution in which unsaturated and saturated acids are mixed, mechanical properties such as elongation, toughness and strength are improved.

At this time, when saturated acid and unsaturated acid are out of the equivalence ratio of 1: 3, for example, when the unsaturated acid is excessive, the intermediate and styrene monomer prepared by the acid mixture are reacted rapidly and the unsaturated polyester resin is prematurely gelled to impregnate with the glass fiber. It can be difficult.

  If the carbon nanotubes are dispersed using the acid mixture in step S110, the carbon nanotubes may be damaged by the acid, thereby deteriorating the characteristics of the carbon nanotubes. In order to overcome this problem, it is difficult to prepare an unsaturated polyester resin through an ongoing process when the acid mixture is added in such a small amount that the carbon nanotubes are not damaged.

Therefore, it is preferable to prepare an acid mixture (S120) separately from the dispersion (S110) in which carbon nanotubes are dispersed in glycol, and then mix the dispersion and the acid mixture (S130).

The saturated acid used in the acid mixture is one selected from phthalic anhydride, phthalic acid and isophthalic acid, and the unsaturated acid is preferably one selected from maleic anhydride, fumaric acid and itaconic acid.

Next, the carbon nanotube dispersion prepared in step S110 and the acid mixture prepared in step S120 are mixed at an equivalent ratio of 1.00 to 1.05: 1, stirred at 150 to 170 ° C. for 50 to 70 minutes, and then 150 to 200 ° C. at 200 to 210 ° C. Compound is prepared by heating and stirring for 200 minutes (S130).

When the equivalent ratio of the carbon nanotube dispersion and the acid mixture is less than 1: 1, unreacted glycol may be present, thereby causing delay in curing or lowering the mechanical strength. When the equivalent ratio is more than 1.05: 1, unreacted acid may be present. The turbidity may be severe in the unsaturated polyester resin itself and the mechanical strength may be reduced.

The final acid value of the carbon nanotube dispersion and the acid mixture is 40 mgKOH / g or less, preferably 30 mgKOH / g or less, and then stirred at 150 to 170 ° C. for 50 to 70 minutes, and then 150 to 200 ° C. at 200 to 210 ° C. Heat stir for minutes.

If the temperature is less than 150 ℃ and 200 ℃ it takes a lot of time to reach the final acid value, the carbon nanotubes can be damaged by the acid, if the temperature is higher than 170 ℃ and 210 ℃ acid at high temperature reaction The carbon nanotubes may be more easily damaged by the carbon nanotubes, and thus may not exhibit the properties of the carbon nanotubes, and the unsaturated polyester resin produced may be gelled to impregnate the glass fiber.

In addition, when the reaction time is less than 50 minutes and 150 minutes, the reaction of the carbon nanotube dispersion and the mixed solution of saturated acid and unsaturated acid may not be properly performed, thus making it difficult to prepare unsaturated polyester resins. The unsaturated polyester resin produced may be gelled and difficult to impregnate with glass fibers.

The carbon nanotube dispersion used may be one or two or more selected from carbon nanotube dispersions made of polyethylene glycol, carbon nanotube dispersions made of propylene glycol, and carbon nanotube dispersions made of neopentyl glycol. In the case of using two or more kinds of carbon nanotube dispersions, there is a limit to the amount of carbon nanotubes dispersed in glycol when high concentrations of carbon nanotubes are required to improve the electrical conductivity and mechanical strength of glass fiber reinforced plastics. Therefore, two or more kinds of glycols in which carbon nanotubes are dispersed are used.

Intermediate (hereinafter referred to as intermediate) and styrene monomer prepared in step S130 is mixed by a weight ratio of 50:50 ~ 70:30 to prepare an unsaturated polyester resin (S140).

In this case, in order to prevent a natural radical polymerization reaction between the styrene monomer and the double bond of the compound, it is preferable to add hydroquinone to the compound as a polymerization inhibitor and then mix the compound and the styrene monomer. The polymerization inhibitor is added in an amount of 0.0001 to 0.0005 parts by weight based on 100 parts by weight of the compound.

In addition, the styrene monomer may be added and dispersed by adding 1 to 3 parts by weight of carbon nanotubes with respect to 100 parts by weight of styrene monomer and then mixed with a compound containing a polymerization inhibitor. The carbon nanotubes used here are the same as the carbon nanotubes used when preparing the carbon nanotube dispersion.

When the unsaturated polyester resin is cured, 1 to 2 parts by weight of a curing agent and 1 to 3 parts by weight of an accelerator are added to 100 parts by weight of the unsaturated polyester resin prepared in step S140 to generate radicals necessary for inducing a polymer condensation polymerization reaction. S150).

As the curing agent, it is preferable to use a low-temperature curing agent made of a peroxide-based material and a high-temperature curing agent made of any one material selected from a substance of a peroxide-based or tertiary butyl group (TBPB).

In addition, it is preferable to use N, N- dimethyl paratoluidine (DMA) as an accelerator.

The unsaturated polyester resin prepared in step S150 is applied and the glass fiber is laminated on the coated upper surface and the glass fiber is impregnated in the unsaturated polyester resin with a roller (S160).

Glass fibers are mats in the form of chopped strands, and may be laminated in more than one layer.

Glass fiber mat in the shape of a spun strand is a fiber mat molded into a mat shape using a binder after pressing the fibers to be uniform thickness after appropriately cut the length of the fiber yarn. The glass fiber mat of this type is not only easy to manufacture because it does not need to be arranged regularly, but also provides a passage through which invasion holes are formed between irregularly arranged fiber yarns so that unsaturated polyester resin can invade. Therefore, even when the glass fiber mat is laminated in several layers, the bonding force between the unsaturated polyester resin and the glass fiber mat can be increased.

Unsaturated polyester resin impregnated with glass fibers is left to cure at room temperature, such as 15 to 35 ℃ for 6 to 12 hours to prepare a glass fiber reinforced plastic (S170). After the initial curing, if necessary, after curing at 110 ~ 120 ℃ 100 ~ 250 minutes. Post-curing is preferably carried out when the curing is poor enough to exceed 12 hours in the initial curing.

When curing the unsaturated polyester resin impregnated with glass fibers, when the temperature is less than 15 ℃ takes a long time to cure, if the temperature is over 35 ℃ may cause cracks in the glass fiber reinforced plastic.

In addition, when the curing time is less than 6 hours can be less hardened, if the curing time is more than 12 hours may increase the production time as well as cracks in glass fiber reinforced plastics.

When re-curing, if the temperature is less than 110 ℃ takes a lot of time to cure, if the temperature exceeds 120 ℃ may cause cracks in the glass fiber reinforced plastic. In addition, when the curing time is less than 100 minutes, less curing may be achieved, when the curing time is more than 250 minutes may increase the manufacturing time as well as cracks in glass fiber reinforced plastics.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Example 1.

100 parts by weight of polyethylene glycol and 0.91 part by weight of carbon nanotubes were dispersed with an ultrasonic disperser having a frequency of 40 KHz and a power of 200 W. Separately, phthalic anhydride and maleic anhydride were mixed in an equivalent ratio of 1: 1. After mixing the carbon nanotube dispersion and the acid mixture dispersed in the ultrasonic disperser with an equivalent ratio of 1.05: 1, the mixture was stirred at 150 ° C. for 70 minutes and heated at 200 ° C. for 190 minutes to have a final acid value of 30 mgKOH / g or less. It was. Thus, 100 parts by weight of the intermediate was prepared by adding 0.0001 parts by weight of hydroquinone and then mixing the intermediate and styrene monomer in a 60:40 weight ratio to prepare an unsaturated polyester resin.

1 part by weight of the curing agent and 2 parts by weight of the accelerator are mixed with respect to 100 parts by weight of the unsaturated polyester resin, and then the above-described unsaturated polyester resin is coated on the glass plate coated with the release agent, and the glass fiber mat in the form of chopped strand is coated on the upper surface thereof. By laminating in layers and rolling with a roller, the unsaturated polyester resin and glass fiber were impregnated. Thereafter, the glass fiber-impregnated unsaturated polyester resin was cured at 25 ° C. for 10 hours and then recured at 120 ° C. for 120 minutes to prepare a glass fiber reinforced plastic.

Example 2.

In the same manner as in Example 1, each carbon nanotube dispersion in which 2.27 parts by weight of carbon nanotubes and 1.85 parts by weight of carbon nanotubes are dispersed based on 100 parts by weight of polyethylene glycol as a carbon nanotube dispersion. Was prepared in a weight ratio of 43:57 (polyethylene glycol: propylene glycol) and phthalic anhydride and maleic anhydride were mixed in an equivalent ratio of 1: 3 to prepare an unsaturated polyester resin.

Example 3.

In the same manner as in Example 1, each of the carbon nanotube dispersion in which the carbon nanotube dispersion is dispersed in the carbon nanotube 4.5 parts by weight and 3.7 parts by weight of carbon nanotubes based on 100 parts by weight of polyethylene glycol 100 parts by weight of polyethylene glycol Was prepared in a weight ratio of 43:57 (polyethylene glycol: propylene glycol) to prepare an unsaturated polyester resin.

Example 4.

In the same manner as in Example 1, each carbon nanotube dispersed in the carbon nanotube dispersion liquid 4.92 parts by weight of carbon nanotubes and 2.93 parts by weight of carbon nanotubes based on 100 parts by weight of neopentyl glycol as 100 parts by weight of polyethylene glycol The dispersion was mixed in a weight ratio of 37:63 (polyethylene glycol: neopentyl glycol) to prepare an unsaturated polyester resin.

Example 5.

In the same manner as in Example 1, an unsaturated polyester resin was prepared using a mixture of 2.5 parts by weight of carbon nanotubes based on 100 parts by weight of styrene monomer as the styrene monomer.

Comparative Example 1.

The same procedure as in Example 1 was carried out, but an unsaturated polyester resin was prepared by mixing a glycol and acid mixture in an equivalent ratio of 1.05: 1 without using carbon nanotubes.

Comparative Example 2

In the same manner as in Example 1, each carbon nanotube dispersion of 0.25 parts by weight of carbon nanotubes and 0.15 parts by weight of carbon nanotubes based on 100 parts by weight of neopentyl glycol as a carbon nanotube dispersion The dispersion was mixed in a weight ratio of 37:63 (polyethylene glycol: neopentyl glycol) to prepare an unsaturated polyester resin.

Comparative Example 3

In the same manner as in Example 1, each carbon nanotube dispersed in 24.8 parts by weight of carbon nanotubes and 8.8 parts by weight of carbon nanotubes based on 100 parts by weight of neopentyl glycol as a carbon nanotube dispersion The dispersion was mixed in a weight ratio of 37:63 (polyethylene glycol: neopentyl glycol) to prepare an unsaturated polyester resin.

Comparative Example 4

In the same manner as in Comparative Example 1, an unsaturated polyester resin was prepared using a mixture of 2.5 parts by weight of carbon nanotubes based on 100 parts by weight of styrene monomer as the styrene monomer.

Test example.

1. Dispersibility: The carbon nanotube dispersion was visually observed to maintain the dispersion for each period after the dispersion.

-○: The dispersion state of carbon nanotubes lasts more than 20 days.

△: dispersed state of carbon nanotubes for more than 10 days.

-X: The dispersion state of carbon nanotubes lasts less than 10 days.

2. Tensile strength (MPa): Tensile strength was measured by a universal test machine (UTM) using glass fiber reinforced plastic specimens of 10 X 10 cm.

3. Flexural Strength (MPa): Flexural strength was measured by a universal test machine (UTM) using glass fiber reinforced plastic specimens of 10 × 10 cm.

4. Surface resistance: Surface resistance was measured by a surface resistance measuring instrument (Mitsubishi Chemical, MCP-T610) using a glass fiber reinforced plastic specimen of 5 X 5 cm.

5. Workability: The workability during impregnation of unsaturated polyester resin and glass fiber was evaluated.

-○: It is easily impregnated with unsaturated polyester resin and glass fiber by rolling less than 5 times by hand roller.

?: Impregnated with unsaturated polyester resin and glass fiber by rolling more than 10 times with a hand roller.

-X: not impregnated.

division Dispersibility The tensile strength
(MPa) Flexural strength
(MPa) Surface resistance
(Ohm / sq) Workability Example 1 ○ 110 182 2 x 10 ⁷ ○ Example 2 ○ 117 185 ⁶ x 10 ⁶ ○ Example 3 ○ 120 190 8 x 10 ⁵ ○ Example 4 ○ 117 187 1 x 10 ⁵ ○ Example 5 ○ 112 180 9 x 10 ⁴ ○ Comparative Example 1 ○ 98 159 9x10 ¹² ○ Comparative Example 2 ○ 100 161 1 x ^{10 10} ○ Comparative Example 3 X 91 156 ⁷ x 10 ⁷ X Comparative Example 4 ○ 109 175 ⁷ x 10 ⁷ △

As shown in Table 1, it can be seen that the glass fiber-reinforced plastics of Examples 1 to 5 prepared according to the present invention have a low surface resistance compared to Comparative Examples 1 to 4, so that the current flows smoothly. In addition, it was confirmed that the glass fiber-reinforced plastics of Examples 1 to 5 were superior in tensile strength and flexural strength as compared with Comparative Examples 1 to 4.

In addition, when saturated and unsaturated acids were mixed in an equivalent ratio of 1: 4, unsaturated polyester resins gelled, so that impregnation with glass fibers was not easy, and thus glass fiber reinforced plastics could not be produced.

Claims (11)

Preparing a carbon nanotube dispersion by mixing and dispersing 0.6-20 parts by weight of carbon nanotubes to 100 parts by weight of one or more glycols selected from the group consisting of polyethylene glycol, propylene glycol and neopentyl glycol;
Preparing an acid mixture to be mixed with the carbon nanotube dispersion by mixing saturated acid and unsaturated acid so that the equivalent ratio of saturated acid and unsaturated acid is 1: 1 to 3;
Mixing the carbon nanotube dispersion and the acid mixture in an equivalent ratio of 1.00 to 1.05: 1 and stirring the mixture at 150 to 170 ° C. for 50 to 70 minutes, followed by heating and stirring at 200 to 210 ° C. for 150 to 200 minutes;
Preparing an unsaturated polyester resin by adding a polymerization inhibitor to the intermediate prepared by heating and stirring, and then mixing the intermediate and styrene monomer in a weight ratio of 50:50 to 70:30; And
Method for producing a glass fiber reinforced plastic comprising the step of impregnating the unsaturated polyester resin and glass fiber.
The method of claim 1, wherein the impregnating of the unsaturated polyester resin and the glass fiber comprises the steps of: applying an unsaturated polyester resin to which an accelerator and a curing agent are added, and laminating the glass fiber on the impregnated with a roller; And curing the glass fiber impregnated unsaturated polyester resin at 15 to 35 ° C. for 6 to 12 hours to cure.
The method of claim 1, wherein the styrene monomer comprises 1 to 3 parts by weight of carbon nanotubes based on 100 parts by weight of styrene monomer.
The method according to claim 1 or 3, wherein the average diameter of the carbon nanotubes is 100 nm or less.
The method according to claim 1 or 3, wherein the average length of the carbon nanotubes is 1,000 µm or less.
The method for producing glass fiber reinforced plastics according to claim 1, wherein ultrasonic dispersion or ball milling is used to disperse the carbon nanotubes in the glycol.
delete The method of claim 1, wherein the saturated acid is selected from the group consisting of phthalic anhydride, phthalic acid and isophthalic acid.
The method of claim 1, wherein the unsaturated acid is selected from the group consisting of maleic anhydride, fumaric acid, and itaconic acid.
The carbon nanotube dispersion mixed with the acid mixture is selected from carbon nanotube dispersion made of polyethylene glycol, carbon nanotube dispersion made of propylene glycol, and carbon nanotube dispersion made of neopentyl glycol. Method for producing a glass fiber reinforced plastic which is a mixture of the above.
The method of claim 2, wherein the step of post-curing at 100-250 minutes at 110-120 ° C. after curing is added.

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