JP2005335296A - Manufacturing method of tow prepreg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a tow prepreg which can impregnate a flat tow with a matrix resin sufficiently and uniformly, which can inhibit the fluctuations of tensile strength due to the individual difference at the time when the obtained tow prepreg is cured, and which can produce the tow prepreg excellent in the average tensile strength with a good yield. <P>SOLUTION: The manufacturing method of the tow prepreg comprises the step of sufficiently and uniformly dispersing a resin and a curing agent into the tow by supplying a specific amount of a resin containing material (X) containing the resin and the curing agent through a nozzle from both sides of the continuous flat tow, or by supplying a given amount of a curing agent aqueous solution (Y) through a nozzle from the surface of the continuous flat tow and then supplying a given amount of a resin solution (Z) through a nozzle from the surface of the continuous flat tow. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a tow prepreg used for molding fiber reinforced plastics, particularly FW (filament winding method) molding, braids, woven prepregs and the like.

Composite materials consisting of carbon fiber, glass fiber, aromatic polyamide fiber and other reinforcing fibers and epoxy resin are excellent in specific strength and specific elastic modulus, so it can be used for sports applications, structural materials for aircraft, civil engineering materials, rolls, etc. Widely used in the field.
In order to produce these composite materials, reinforcing fibers may be used as processing materials as they are, but in many cases, they are impregnated with resin and used as intermediate processing materials such as woven prepregs, chopped fiber prepregs, sheet prepregs, and tow prepregs. Often used as.
In any case, it is desired to reduce the manufacturing cost of the composite material molded product, which is the final product, while increasing the quality. In particular, controlling the ratio of fibers and matrix resin in composite material molded products is extremely important for improving the properties of composite material molded products such as strength, elastic modulus, and coefficient of thermal expansion, and obtaining products with stable quality. It is a thing.
Toe prepregs are used in the manufacture of FW molding, braided cords, woven fabrics, etc. When using toe prepregs, compared to existing methods, there is less fuzz and high yield and high work efficiency and no resin impregnation step is required. Thus, the manufacturing cost can be reduced.

By the way, the tow prepreg exhibits excellent strength by curing the resin impregnated at the time of molding. In order to develop such excellent strength, it is necessary to impregnate the tow with a matrix resin as uniformly as possible during the production of the tow prepreg.
Therefore, in Patent Document 1, a resin is quantitatively supplied to at least one side of a flattened tow, and the resin is infiltrated in the thickness direction of the tow at the same time or immediately after the resin is brought into contact with the tow. There has been proposed a method for producing a tow prepreg in which resin is uniformly impregnated in the tow by moving in the direction, and then cooled and wound. Further, in Patent Document 2, a resin is quantitatively supplied to at least one side of a tow that is flat and has a dense filament density that is configured in the width direction, and at the same time or immediately after the resin is brought into contact with the tow, the thickness direction of the tow A tow prepreg manufacturing method has been proposed in which resin is uniformly impregnated in the tow by lateral movement of the filaments constituting the tow and then cooled and wound. Further, Patent Document 3 proposes a method for producing a tow prepreg characterized in that a matrix resin is supplied to the tow through a nozzle at a constant supply amount, and the tow passing over the nozzle has a constant speed. Has been.
In these production methods, the matrix resin can be impregnated almost uniformly into the tow, and it exhibits superior strength compared to the tow prepreg produced by the conventional resin bath method, rotating roll method, on-paper transfer method, etc. Can do.
However, even if the tow prepreg produced by the method described in the above-mentioned patent document has a sufficient amount of resin impregnation, for example, when the obtained tow prepreg is cured, the average tensile strength is determined from the amount of resin impregnation. There may be a case where the theoretical value is 10% or more lower than the required theoretical value, or a case where the variation in tensile strength is large. Further, such a tendency seems to be high when a flat yarn bundle having a high fineness (TEX) is used.
Therefore, development of a method for producing a tow prepreg that can further suppress variation in strength due to individual differences in the obtained tow prepreg and that can be expected to further improve the average tensile strength is desired.
JP-A-8-73630 Japanese Patent Laid-Open No. 9-31219 JP-A-9-176346

  An object of the present invention is to sufficiently and uniformly impregnate a matrix resin into a flat tow and to suppress variation in tensile strength due to individual differences when the obtained tow prepreg is cured. Furthermore, another object of the present invention is to provide a method for producing a tow prepreg capable of producing a tow prepreg excellent in average tensile strength with a high yield.

The present inventors diligently studied to solve the above problems. First, even if the matrix resin can be sufficiently and uniformly impregnated into flat tow, for example, when the obtained tow prepreg is cured, the average tensile strength obtained is determined from the amount of resin impregnation. The cause of the occurrence of a case where the value is considerably lower than the required theoretical value or a case where the variation in the average tensile strength is increased may be examined. As a result, the curing agent used for curing the resulting tow prepreg is usually dispersed in a resin-containing material containing a matrix resin and impregnated in the tow together with the matrix resin. It was speculated that the curing agent might not be uniformly dispersed even if the resin itself could be sufficiently and uniformly impregnated in the tow due to the fiber diameter of the flat tow and the like. .
Based on this assumption, we considered a process that can uniformly disperse the curing agent together with the matrix resin with tow, and when it was executed, it was found that the above-described decrease and variation in average tensile strength could be suppressed. The present invention has been completed.

That is, according to the present invention, there is provided a method for producing a tow prepreg in which a matrix resin is supplied to a flat tow, uniformly impregnated and wound, and the resin-containing material (X) containing the matrix resin and the curing agent is first Supplying a specific amount from one surface of the continuous flat tow via the nozzle of the second and the resin-containing material (A-1) from the other surface of the continuous flat tow via the second nozzle ( A specific amount of X), and the continuous flat tow feeds the first nozzle in step (A-1) and the second nozzle in step (B-1) at a constant speed. And the step (C-1) of winding the tow prepreg by controlling so as to pass through each of the specific amounts for supplying the resin-containing material (X) in the step (A-1) and the step (B-1). In step (A-1) and step (B-1), control is performed so that the flat tow is uniformly impregnated with the matrix resin and the curing agent. A method for producing a tow prepreg (hereinafter sometimes referred to as the first method of the present invention) is provided.
Further, according to the present invention, there is provided a method for producing a tow prepreg in which a matrix resin is supplied to a flat tow, uniformly impregnated and wound up, and the curing agent aqueous solution (Y) containing a curing agent for the matrix resin is first The step (A-2) of supplying a certain amount from the surface of the flat tow continuous through the nozzle of the nozzle and the surface of the flat tow continuous through the second nozzle of the resin solution (Z) containing the matrix resin (B-2) in which a constant amount is supplied from the nozzle, and the continuous flat tow passes through the first nozzle in the step (A-2) and the second nozzle in the step (B-2) at a constant speed. A step (C-2) of winding the tow prepreg so as to control the resin, and after supplying the aqueous solution of the curing agent (Y) in the step (A-2), the resin in the step (B-2) A method for producing a tow prepreg characterized by supplying the solution (Z) (hereinafter referred to as the second method of the present invention) There are Ukoto) is provided.

  The method for producing a tow prepreg of the present invention includes the step (A-1), the step (B-1), and the step (C-1), and includes the resin in the step (A-1) and the step (B-1). Curing agent according to the step (A-2), because each specific amount to be supplied with the product (X) is controlled or includes the step (A-2), the step (B-2) and the step (C-2) After supplying the aqueous solution (Y), the resin solution (Z) is supplied by the step (B-2), so that the flat tow is sufficiently and uniformly impregnated with the matrix resin and the curing agent. Moreover, when the obtained tow prepreg is cured, variations in tensile strength due to individual differences can be suppressed, and furthermore, a tow prepreg excellent in average tensile strength can be produced with high yield.

Hereinafter, the production method of the present invention will be described in more detail.
As a flat tow used in the production method of the present invention, a bundle of reinforcing fibers applied as a tow is flatly bundled, and for example, the ratio of width to thickness is usually 10 to 1000: 1, preferably 30 to A flat tow that falls within a range of 100: 1 can be mentioned. The reinforcing fiber is not particularly limited, and examples thereof include carbon fiber, glass fiber, alumina fiber, silicon carbide fiber, boron fiber, and aramid fiber, and the use of carbon fiber is particularly preferable. Moreover, the desired effect of the present invention becomes more remarkable by using carbon fibers which are hard to be impregnated with resin, have a fiber diameter of 6 μm or less and a fineness of 800 g / km or more.
The matrix resin used in the production method of the present invention is not particularly limited, and examples thereof include a thermosetting resin used for tow prepreg, and an epoxy resin is particularly preferable in terms of handleability.

The resin-containing material (X) used in the first method of the present invention contains a curing agent for curing the resin in addition to the matrix resin. The curing agent can be appropriately selected according to the type of the matrix resin, and the blending ratio can also be appropriately determined according to the type and amount of the resin.
The resin-containing material (X) may contain a solvent or a curing accelerator that dissolves the matrix resin, and the viscosity thereof can be easily supplied to the flat tow from the first or second nozzle, for example, At 15 to 30 ° C., the viscosity can be adjusted to a low viscosity in the range of usually 0.01 to 300 poise, preferably 0.1 to 100 poise, most preferably 0.1 to 10 poise with a solvent or the like. If the viscosity exceeds 300 poise, impregnation into the tow tends to be insufficient and fluffing of the tow tends to occur. On the other hand, if the viscosity is less than 0.01 poise, the liquid may be easily drained. It is not preferable.
The ease of impregnation of the matrix resin into the tow differs not only with the viscosity of the resin-containing material (X) but also with the tow filament diameter and the sizing agent used. Since the tow using the agent is difficult to impregnate the matrix resin, it is desirable to appropriately determine the viscosity and the like of the resin-containing material (X) in consideration of these.

  In steps (A-1) and (B-1) in the first method of the present invention, the resin-containing material (X) is added in a specific amount from one surface of a flat tow that is continuous through the first nozzle. The temperature of the resin-containing material (X) when supplying a specific amount from the other surface of the flat tow continuous through the second nozzle may be a temperature at which the matrix resin does not cure, In order to facilitate the impregnation of the resin-containing material (X) inside the tow, it is usually preferable to adjust the temperature within the range of 15 to 150 ° C., with the upper limit being 30 ° C. lower than the curing temperature of the matrix resin. It is desirable to adjust to the range of 15 to 90 ° C. in order to make it.

Each specific amount for supplying the resin-containing material (X) in the step (A-1) and the step (B-1) is a matrix resin and a flat tow by the step (A-1) and the step (B-1). It is necessary to control the amount so that the curing agent is uniformly impregnated. Preferably, the supply amount of the resin-containing material (X) in the step (A-1) and the step (B-1) is controlled to be approximately the same so that the matrix resin is uniformly impregnated into the flat tow. Is preferred. By supplying a specific amount of the resin-containing material (X) from both sides of such a flat tow, a large amount is present on the surface side to which the curing agent contained in the resin-containing material (X) is supplied and into the tow. Decrease in the dispersibility of the curing agent due to a decrease in the supply amount of is suppressed, and the curing agent is easily dispersed uniformly together with the matrix resin.
Further, the shapes of the first nozzle and the second nozzle for supplying the resin-containing material (X) are not particularly limited, but in order to make the impregnation of the resin-containing material (X) into the tow easier, It is particularly preferable that the discharge port has a flat shape that substantially matches the width of the flat tow. More preferably, the resin-containing material (X) is stretched using a spatula made of soft silicone rubber or the like immediately after passing through the nozzle so that the resin-containing material (X) supplied on the tow is uniformly dispersed. That is good. A nozzle having such a preferable shape can also be preferably exemplified as the form of the first nozzle and the second nozzle used in the second method of the present invention described later.
Furthermore, the flat tow after supplying the resin-containing material (X) from both sides in the step (A-1) and the step (B-1), before the step (C-1) described later, for example, By heating and pressing through a heatable nip roll or the like, the resin-containing material (X) can be more uniformly impregnated into the tow.

On the other hand, in the second method of the present invention, the step (A-2) comprises a constant amount of a curing agent aqueous solution (Y) containing a matrix resin curing agent from the surface of the flat tow continuous through the first nozzle. It is a process of supplying.
The curing agent used in the step (A-2) is not particularly limited as long as it is a matrix resin curing agent used in the step (B-2) described later and is a water-soluble curing agent that can be used as the curing agent aqueous solution (Y). However, it can be appropriately selected depending on the type of the matrix resin. Further, the concentration of the curing agent can be appropriately selected according to the amount of the matrix resin used in the step (B-2) and so as to remain in the tow when supplied to the tow by the first nozzle.
In the step (A-2), for example, as in the resin-containing material (X) used in the first method of the present invention, the curing agent is not dispersed but a curing agent aqueous solution in which the curing agent is dissolved ( Since Y) is used, the curing agent can be easily infiltrated evenly into the inside and the back surface of the flat tow. Therefore, in the second method of the present invention, it is not always necessary to supply the aqueous curing agent solution (Y) from both sides of the flat tow as in the first method.

  After supplying the aqueous curing agent solution (Y) to the flat tow in step (A-2), before proceeding to the next step (B-2), the moisture supplied to the flat tow is supplied to the matrix resin. It is necessary to dry in consideration of adverse effects. The drying may be natural drying, but in industrial production, in order to perform each step continuously, after step (A-2), before step (B-2), etc. It is preferable to perform a drying step of forcibly drying using By forcibly performing such drying, moisture can be dried and the curing agent supplied in the step (A-2) can be quickly fixed in the flat tow.

In the second method of the present invention, the step (B-2) is a step of supplying a predetermined amount of the resin solution (Z) containing the matrix resin from the surface of the continuous flat tow through the second nozzle.
In the step (B-2), the resin solution (Z) is desirably adjusted by a solvent, heating or the like so as to have the same preferable viscosity and temperature as the resin-containing material (X) used in the first method. .
In the step (B-2), since the curing agent is already uniformly dispersed and fixed on the flat tow to which the resin solution (Z) is supplied, the second resin so that the matrix resin is uniformly dispersed on the flat tow. A certain amount may be supplied from the nozzle.

  In the second method of the present invention, the flat tow after the supply of the curing agent and the matrix resin in the step (A-2) and the step (B-2) is further performed in a step (C- Prior to 2), the matrix resin can be more forcibly uniformly impregnated with the matrix resin by, for example, heating and pressing through a heatable nip roll or the like.

In the first and second methods of the present invention, the first nozzle in step (A-1) or step (A-2) or the second nozzle in step (B-1) or step (B-2) In order to supply the resin-containing material (X) to the flat tow in a specific amount and a certain amount of the curing agent aqueous solution (Y) or the resin solution (Z), for example, each nozzle using gravity The desired liquid can be supplied to the nozzle, or the desired liquid can be forcibly supplied to each nozzle using a supply pump or the like.
When gravity is used, it is preferable to adjust the supply amount to the nozzle with a flow meter, a flow control valve or the like. When using a supply pump, it is preferable to supply to the nozzle using a pump excellent in quantitative supply, for example, a rotary pump, a plunger pump, a gear pump, a Mono pump, a spiral pump, a cascade pump, a midland pump, a diaphragm pump, etc. .

The matrix resin content in the tow prepreg controls the yarn speed when passing through each nozzle of the continuous flat tow in the step (C) to be described later, so that the resin-containing material (X) or the curing agent aqueous solution It can be easily controlled by adjusting the supply amounts of (Y) and the resin solution (Z).
Supply amount of resin-containing material (X) or aqueous curing agent solution (Y) and resin solution (Z) is (yarn speed) x (weight of tow per unit length) x (matrix resin content (mass%) Set value) / [100- (set value of matrix resin content (mass%))], but usually 0.1 to 240 g / min, preferably 1 to 100 g in terms of matrix resin content to be contained. It can be set in the range of / min.
Although the setting range of the matrix resin content by the above method is not particularly limited, it is usually 5 to 50% by mass, preferably 10 to 40% by mass with respect to the tow. When the content of the matrix resin exceeds 50% by mass, dripping occurs and it is difficult to control the resin content accurately, and when it is less than 5% by mass, it is difficult to uniformly impregnate the matrix resin inside the tow. Therefore, it is not preferable. The accuracy with respect to the set value of the matrix resin content is ± 2% or less, preferably ± 1% or less.

In the first and second methods of the present invention, the continuous flat tow comprises the first nozzle in the step (A-1) or the step (A-2) and the step (B-1) or the step (B Step (C-1) or step (C-2) (hereinafter referred to as step (C) for obtaining these tow prepregs by controlling to pass through the second nozzle at a constant speed in -2) A desired tow prepreg can be produced.
In the step (C), the speed at which the continuous flat tow passes through the first nozzle and the second nozzle at a constant speed, that is, the yarn speed, is the resin-containing material (X) containing a matrix resin or It can be appropriately selected according to the supply amount of the resin solution (Z), its viscosity, and the type of reinforcing fiber. The target yarn speed set for uniformly impregnating the matrix resin into the flat tow is preferably controlled so that the fluctuation is within ± 5%, preferably within ± 3%.
The yarn speed when the type of reinforcing fiber is carbon fiber is usually 5 to 200 m / min, preferably 5 to 150 m / min, from the viewpoint of workability. If the yarn speed is less than 5 m / min, the productivity of the tow prepreg is bad and not preferable, and if it exceeds 200 m / min, yarn breakage and fluff are likely to occur, which is not preferable.
When the viscosity of the resin-containing material (X) or the resin solution (Z) is 0.01 to 10 poise, the yarn speed is usually 5 to 200 m / min, preferably 5 to 150 m / min. The yarn speed when the viscosity of the resin-containing material (X) or the resin solution (Z) is more than 10 poise and not more than 100 poise is usually 5 to 150 m / min, preferably 5 to 120 m / min. Furthermore, the yarn speed when the viscosity of the resin-containing material (X) or the resin solution (Z) is more than 100 poise and not more than 300 poise is usually 5 to 120 m / min, preferably 5 to 100 m / min.
When the viscosity of the resin-containing material (X) or the resin solution (Z) is greater than 300 poise, the yarn speed can be reduced, and when the viscosity is less than 0.01 poise, the yarn speed can be increased. However, it is not preferable because dripping easily occurs.

Below, with reference to FIG.1 and FIG.2, the preferable embodiment of the manufacturing method of this invention is described.
FIG. 1 is a schematic diagram for explaining the first method of the present invention, in which 10 is a feeding portion of a tow 11, 20 is a resin impregnation portion, 30 is a multistage constant speed feed roller portion, and 40 is a tow. This is a winding portion of the prepreg 41.
The feeding unit 10 includes a creel 12, and the tow 11 is fed from the creel 12 to the resin impregnated unit 20 through the guide roller 13.

The resin-impregnated portion 20 includes a preheat pulley (21a, 21c), a heat pulley (21b, 21d), a resin-containing material (X) through a gear pump 23 from a tank 22 of a resin-containing material (X) containing a matrix resin and a curing agent. Are provided with a first flat nozzle 24a and a second flat nozzle 24b for supplying a specific amount of heat, and a heatable nip roll 25.
In the resin impregnation unit 20, the tow 11 fed from the feeding unit 10 is passed through the preheating pulleys (21a, 21c) and heated to a predetermined temperature, and at the same time, the tow 11 advances while making the cross-section of the tow flat. A specific amount of the resin-containing material (X) is supplied from the first flat nozzle 24a to the tow 11 that advances from the preheating pulley 21a to the heat pulley 21b from one surface side on the heat pulley 21b. Subsequently, the tow 11 is reversed by passing the preheating pulley 21c, and proceeds to the heat pulley 21d. A specific amount of the resin-containing material (X) is supplied from the second flat nozzle 24b to the other surface side of the tow 11 on the heat pulley 21d. At this time, it is preferable to control the supply amount of the resin-containing material (X) supplied from the first and second flat nozzles (24a, 24b) to the same amount.
The tow 11 supplied with the resin-containing material (X) from both sides is further forcedly impregnated with the resin-containing material (X) in the nip roll 25 uniformly in the tow 11 and rotated at a constant speed. 30 is passed, and is wound up as a tow prepreg 41 in the winding unit 40. At this time, since the linear velocity is constant, the tow prepreg can be manufactured with a constant resin content from start to finish even if the diameter of the bobbin in the winding portion 40 changes.

The tank 22 is preferably a sealed type so that the pot life of the matrix resin in the resin-containing material (X) can be increased. The resin-containing material (X) can be heated by heating the tank 22 and the first and second flat nozzles (24a, 24b).
By using flat nozzles as the nozzles (24a, 24b), the resin-containing material (X) is supplied to the tow 11 while being stretched over the entire width of the expanded tow.

  FIG. 2 is a schematic diagram for explaining the second method of the present invention. The drawing portion 10, the multistage constant speed feed roller portion 30 and the winding portion 40 are the same as those in FIG. The same reference numerals as those in FIG.

In FIG. 2, reference numeral 50 denotes a resin-impregnated portion for impregnating the tow 11 fed from the feeding portion 10 through the guide roller 13, with a heat pulley (51a, 51b) and a tank of a hardener aqueous solution (Y). The first flat nozzle 55a for supplying a fixed amount of the curing agent aqueous solution (Y) from 53a through the gear pump 54a, the resin solution (Z) from the tank 53b of the resin solution (Z) containing the matrix resin through the gear pump 54b Are provided with a second flat nozzle 55b for supplying a constant amount of water, a drying furnace 52 and a heatable nip roll 25 provided between the first and second flat nozzles (55a, 55b).
In the resin impregnation unit 50, the tow 11 fed from the feeding unit 10 is passed through the heat pulley 51a and heated to a predetermined temperature, and at the same time, the first cross section of the tow is made flat on the heat pulley 51a. A fixed amount of the curing agent aqueous solution (Z) is supplied from the flat nozzle 55a. Subsequently, the tow 11 is passed through a drying furnace 52 to dry the moisture, and the curing agent is fixed inside the tow. Then, the tow 11 proceeds to the heat pulley 51b, and reaches a certain amount from the second flat nozzle 55b on the heat pulley 51b. The resin solution (Z) is supplied to the tow 11.
The tow 11 supplied with the aqueous curing agent solution (Y) and the resin solution (Z) is further forcedly impregnated with the resin solution (Z) in the nip roll 25 uniformly in the tow 11 and rotated at a constant speed. The roller part 30 is passed through and taken up as a tow prepreg 41 in the take-up part 40. At this time, since the linear velocity is constant, the tow prepreg can be manufactured with a constant resin content from start to finish even if the diameter of the bobbin in the winding portion 40 changes.

1 and 2, the number of creels, guide pulleys, preheating pulleys, and the like can be selected as appropriate, and a plurality of tow prepregs can be manufactured simultaneously by installing them in parallel. The tow heating method may be any method, but preheating that allows tow heating, toe flattening, and impregnation with the resin-containing material (X), the curing agent aqueous solution (Y), and the resin solution (Z) simultaneously. The use of pulleys and heat pulleys is preferred. The use of the pulley can effectively promote the impregnation of the resin-containing material (X), the curing agent aqueous solution (Y), and the resin solution (Z). It is also easy to produce a plurality of tow prepregs by arranging two or more heat pulleys in parallel, and it is possible to perform mass production without taking up space.
In order to obtain a tow prepreg having a uniform resin content, the cross-sectional shape of the groove of each pulley may be affected. The cross-sectional shape of the preheating pulley and the groove of the heat pulley can be any of U shape, V shape, inverted U shape, U shape with flat bottom, etc., but U shape with flat bottom The mold is preferably used because the tow can be flattened to a uniform thickness and the resin-containing material (X) can be uniformly impregnated.
In the present invention, a drum, a roll or the like can be used instead of the pulley if the same effect as described above can be obtained.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited by this.
Example 1
Carbon fiber TRH50-12K manufactured by Mitsubishi Rayon Co., Ltd. (trade name, number of filaments 12,000, weight per unit length of tow 0.81 g / m) as tow, viscosity at 25 ° C. is 30 poise, and Using a resin-containing material (X) having a viscosity at 80 ° C. of 0.4 poise, a thermosetting epoxy resin having a curing temperature of 130 ° C. as a matrix resin, and dicyandiamide as a curing agent, it is shown in FIG. A tow prepreg was manufactured by a manufacturing process.
The yarn speed of the tow passing through the first nozzle and the second nozzle for supplying the resin-containing material (X) was 50 m / min. A tow prepreg having a resin content target value of 30% by mass was produced with the resin content (X) supplied at 17 g / min (each 8.5 g / min from the first nozzle and the second nozzle). The actual resin content of the obtained tow prepreg was measured. The results are shown in Table 1.
Further, using this tow prepreg, a sheet having a thickness of about 0.9 mm in which fibers were arranged in one direction was produced by a filament winding method, and heat-cured in an autoclave to obtain a molded plate. A tensile test was performed on the obtained plate according to the JIS K7073 test method. The results are shown in Table 1. In addition, the measurement frequency | count of each value is 7 times, and Table 1 shows the average value and standard deviation in the result.

Comparative Example 1
The tow similar to that in Example 1 is impregnated with the same resin-containing material (X) as in Example 1 using a rotating drum having a doctor blade, and the tow is adjusted so as to have the same resin content as in Example 1. A prepreg was produced. The resin content of the obtained tow prepreg was measured. The results are shown in Table 1.
Further, this tow prepreg was molded in the same manner as in Example 1, and a tensile test of the molded plate was performed. The results are shown in Table 1.

Comparative Example 2
In Example 1, the total supply amount of the resin-containing material (X) from the first nozzle and the second nozzle in Example 1 is set to the second without supplying the resin-containing material (X) from the first nozzle. This was done only from the nozzle. In short, a tow prepreg was produced in the same manner as in Example 1 except that only one side of the tow was impregnated. The results of measuring the resin content of the obtained tow prepreg are shown in Table 1.
Further, this tow prepreg was molded in the same manner as in Example 1, and a tensile test of the molded plate was performed. The results are shown in Table 1.

  From Table 1, the tow prepreg of Example 1 manufactured by the manufacturing method of the present invention and the tow prepreg manufactured by Comparative Example 2 have resin content uniformity compared to the tow prepreg manufactured in Comparative Example 1. It turns out that it is extremely expensive. Furthermore, although the tow prepreg of Example 1 manufactured by the manufacturing method of the present invention has the same degree of uniformity in resin content as the tow prepreg manufactured by Comparative Example 2, the machine as the final product It can be seen that the physical property (average tensile strength) is higher than that of the tow prepreg produced in Comparative Example 2 and has excellent performance that variation is small.

It is a schematic diagram for demonstrating one embodiment in the manufacturing method of the tow prepreg of this invention. It is a schematic diagram for demonstrating the other embodiment in the manufacturing method of the tow prepreg of this invention.

Explanation of symbols

10: Feeding part 11: Tow 12: Creel 13: Guide pulley 20, 50: Resin-containing part 21a, 21c: Preheating pulley 21b, 21d, 51a, 51b: Preheating pulley 22: Resin-containing material (X) tanks 23, 54a, 54b: Gear pump 53a: Curing agent aqueous solution (Y) tank 53b: Resin solution (Z) tank 24a, 55a: First flat nozzle 24b, 55b: Second flat nozzle 25: Nip roll 30: Multistage constant speed feed roller section 40: Winding part 41: Toe prepreg

Claims (3)

A method for producing a tow prepreg which supplies a matrix resin to a flat tow, uniformly impregnates and winds it up,
Supplying a specific amount of a resin-containing material (X) containing a matrix resin and a curing agent from one surface of a continuous flat tow via the first nozzle;
Supplying a specific amount of the resin-containing material (X) from the other surface of the continuous flat tow through a second nozzle (B-1);
A step of winding the tow prepreg by controlling the continuous flat tow to pass through the first nozzle in the step (A-1) and the second nozzle in the step (B-1) at a constant speed (C -1) and
Each specific amount for supplying the resin-containing material (X) in the step (A-1) and the step (B-1) is added to the matrix resin and the flat tow by the step (A-1) and the step (B-1). A method for producing a tow prepreg, wherein the amount is controlled so as to uniformly impregnate a curing agent. A method for producing a tow prepreg which supplies a matrix resin to a flat tow, uniformly impregnates and winds it up,
A step (A-2) of supplying a predetermined amount of a curing agent aqueous solution (Y) containing a matrix resin curing agent from the surface of a continuous flat tow through the first nozzle;
A step (B-2) of supplying a predetermined amount of a resin solution (Z) containing a matrix resin from the surface of a continuous flat tow through a second nozzle;
A step of winding the tow prepreg by controlling the continuous flat tow to pass through the first nozzle in the step (A-2) and the second nozzle in the step (B-2) at a constant speed (C -2)
A method for producing a tow prepreg, comprising: supplying the resin solution (Z) in the step (B-2) after supplying the aqueous curing agent solution (Y) in the step (A-2).   The drying step of drying the moisture of the aqueous solution of the curing agent (Y) supplied to the flat tow is performed after the step (A-2) and before the step (B-2). Manufacturing method.

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