JP2003159708A - Resin impregnating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin impregnating device which is the most suitable to manufacture a prepreg having a front and a back faces both with a uniform resin content, while stabilizing viscosity of resin varnish in an impregnation tank. <P>SOLUTION: In the resin impregnating device, the resin varnish is supplied to an impregnation tank from a resin varnish supply device, and a substrate is impregnated with the resin varnish in the impregnation tank. The device is provided with a resin varnish supply opening on a bottom wall surface of the impregnation tank, and also has an outlet to remove the resin varnish of a high viscosity at a central part of the place where the resin varnish in the impregnation tank is apt to stagnate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optimum resin impregnating apparatus for producing a prepreg having a uniform resin content on both front and back surfaces.

[0002]

2. Description of the Related Art A prepreg used for a metal-clad laminate is manufactured by using a resin impregnation apparatus as shown in FIG. From the resin varnish supply device 2 into the impregnation tank 1, the temperature,
The resin varnish 3 whose viscosity is controlled is supplied, and the base material 6 such as glass cloth is fed into the impregnation tank 1 from the direction A in the drawing. Base material 6 such as glass cloth sent into the impregnation tank 1
Is conveyed in the B direction by the in-tank roll 4 while being immersed in the resin varnish 3 in the impregnation tank 1, and the base material 6 sent out from the impregnation tank 1 in the B direction is coated with the excessive resin varnish. It is cut off and removed by the quantity control device 5,
In the next step, a semi-cured state is dried to form a prepreg. In general, the temperature and viscosity of the resin varnish have a great influence on the resin content of the prepreg, so the resin varnish 3 supplied from the supply device 2 is supplied while being controlled at a predetermined temperature and viscosity. Liquid level control and temperature control by the overflow method are also performed in the impregnation tank 1, and the resin varnish 3 is circulated so that the viscosity of the resin varnish 3 in the impregnation tank 1 becomes uniform.

By the way, when the resin varnish 3 cut off by the coating amount control device 5 flows down to the impregnation tank 1, the solvent content contained in the resin varnish 3 is volatilized, so that it is supplied into the impregnation tank 1. The resin varnish has a viscosity higher than that of the resin varnish 3 to be formed. In such a resin impregnation device,
Since the resin varnish 3 supplied to the impregnation tank 1 is supplied from the liquid supply port 7 of the supply device 2 provided on the lower surface side of the impregnation tank 1, the resin varnish 3 circulates in a part of the impregnation tank 1. A difficult place, that is, a place where the resin varnish 3 is likely to stagnate occurs. For example, as shown by hatching in FIG.
The portion 8 (the in-tank roll contact side) surrounded by the base material 6 on the side that comes into contact with the base material 6 serves as a baffle plate, and thus the resin varnish 3 is less likely to circulate in the impregnation tank 1. However, in this portion 8, the resin varnish having a high viscosity removed from the coating amount control device 5 has poor circulation and diffusibility, and thus becomes a stagnation point of the resin varnish having a high viscosity. In the portion 9 on the contact side, the resin varnish 3 whose temperature and viscosity are controlled can satisfactorily circulate, and the resin varnish state of the target viscosity can be maintained. Japanese Patent Laid-Open No. 08-22994
No. 3 gazette is provided with an auxiliary resin varnish supply device whose temperature and viscosity are controlled as means for eliminating a portion where the resin varnish formed by the base material serving as a baffle in the impregnation tank is difficult to circulate. A resin impregnating device is disclosed.

[0004]

As described above, the impregnation tank 1
When the viscosity of the resin varnish to be impregnated is different between the front and back surfaces of the base material 6, that is, the in-tank roll contact side and the in-tank roll non-contact side, the resin content on both front and back surfaces becomes different, resulting in a laminated plate. It may cause warpage.
Such a phenomenon has a great influence particularly when a varnish containing a filler is used, and deteriorates the properties of the laminated plate. The present invention has been made based on such a situation, the viscosity of the resin varnish in the impregnation tank is stabilized,
Provided is a resin impregnating apparatus most suitable for producing a prepreg having a uniform resin content on both front and back surfaces.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention [1] Resin impregnation in which a resin varnish is supplied from a resin varnish supply device into an impregnation tank, and a base material is impregnated with the resin varnish. In the device, a resin varnish supply port is provided on a bottom wall surface of the impregnation tank, and a resin impregnation device having a withdrawal port for taking out a highly viscous resin varnish is provided at a central portion of the impregnation tank where the resin varnish easily accumulates. . [2] In a resin impregnating device for supplying a resin varnish whose temperature and viscosity are controlled from a resin varnish supplying device into the impregnation tank and impregnating the base material with the resin varnish in the impregnating tank, the resin varnish is provided on the wall surface of the impregnating tank. A resin varnish supply port for feeding the resin varnish from the resin varnish injection port provided is provided, and the resin varnish formed in the impregnation tank becomes a baffle plate and is difficult to circulate, and the resin varnish is sucked up from a portion that easily accumulates. It is a resin impregnating apparatus having an extraction port for taking out the resin varnish. [3] In the above item [2], the temperature of the resin varnish supplied from the resin varnish supply device and the viscosity (η ¹ ) mPa · s of the resin varnish whose viscosity is controlled, and the base material serving as a baffle plate. The viscosity (η ² ) mPa · s of (η ¹ ) / (η ² ) of the resin varnish at the portion where the formed resin varnish is stagnate is 1.00.
/0.95-1.00/1.00. [4] The resin impregnating device according to any one of the items [1], [2], and [3], in which the resin varnish contains a filler.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the above-mentioned resin varnish supply device includes a supply port 10 for supplying a resin varnish as a jet stream to the upper part of the in-tank roll 4 on the side surface of the impregnation tank 1 in addition to the liquid supply port 7. On both sides. Further, an extraction port 11 for sucking up and removing the resin varnish is provided at the center of the portion 8 where the resin varnish having a high viscosity tends to stay on the roll contact side in the tank. The resin varnish is supplied at a ratio of the liquid supply port 7 and the jet flow supply port 10 of approximately 1: 1, and the amount of the resin varnish sucked up from the extraction port 11 is slightly smaller than the supply amount from the jet flow supply port 10.

In the present invention, the temperature of the resin varnish supplied from the resin varnish supply device and the viscosity (η ¹ ) mPa · s of the resin varnish whose viscosity is controlled, and the base material forms a baffle plate. The viscosity (η ² ) mPa · s (η ¹ ) / (η ² ) of the resin varnish at the portion where the generated resin varnish tends to stay is 1.00 / 0.95 to 1.00 / 1.00 Is preferred. If (η ¹ ) / (η ² ) is less than 1.00 / 0.95, the difference in viscosity between the in-tank roll contact side and the in-tank roll non-contact side becomes large, and the resin difference between the front and back surfaces of the prepreg expands. To do. Also, (η ¹ ) / (η ² ) is 1.00 /
The state of 1.00 is most preferable in order to make the resin varnish in the impregnation tank uniform.

Further, according to the present invention, since the base material serves as a baffle plate, the resin varnish with a high viscosity which is cut off by the coating amount control device at a place where the resin varnish is difficult to circulate in the impregnation tank and is easily stagnant. The resin varnish whose temperature and viscosity are controlled can be circulated by a varnish supply by a jet flow and a high-viscosity resin varnish removing device so as not to stay. As a result, the resin varnish in the impregnation tank is made uniform, and the occurrence of resin difference between the front and back surfaces of the prepreg is prevented.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing a resin impregnating apparatus of the present invention. In addition, the same configuration as the conventional one,
Description will be given by using the same reference numerals as those in FIG. In FIG. 1, a resin varnish 3 of which temperature and viscosity are controlled is supplied from a liquid supply port 7 of a resin varnish supply device 2 provided on the lower surface of the impregnation tank 1. A base material 6 such as a glass cloth is fed into the impregnation tank 1 from the direction A in the figure and immersed in the resin varnish 3 while being conveyed in the direction B by the in-tank roll 4. The base material 6 delivered from the impregnation tank 1 in the B direction is removed by removing the excessively attached resin varnish by the coating amount control device 5, and is dried in the next step to a semi-cured state. In the present invention, the supply port 10 for supplying the resin varnish as a jet flow above the in-tank roll 4 and the extraction port 11 for sucking and removing the high-viscosity resin varnish from the location where the high-viscosity resin varnish is likely to stay. Is provided. As a result, at a portion 8 surrounded by the base material 6 on the upper surface side of the impregnation tank 1 that is in contact with the in-tank roll 4, that is, a portion on the in-tank roll contact side, the same temperature as the in-tank roll non-contact side 9, The resin varnish 3 whose viscosity is controlled is forcibly supplied. As described above, this portion 8 is a portion where the base material 6 serves as a baffle plate and the resin varnish 3 is difficult to circulate in the impregnation tank 1 and easily stagnates. Therefore, the high viscosity dropped from the coating amount control device 5 is high. Of the resin varnish is likely to be stagnant, which causes a difference in viscosity of the resin varnish from the portion 9 on the non-contact side of the in-tank roll. However, in the present invention, the resin varnish 3 whose temperature and viscosity are controlled in the same manner as the non-tank roll non-contact side 9 is forcibly supplied by the resin varnish supply port 10 by the jet flow and the high-viscosity resin varnish extraction port 11. Therefore, it is possible to stabilize the viscosity of the resin varnish in the impregnation tank 1 and prevent the difference in resin between the front and back surfaces of the prepreg.

Next, the experimental results of the resin impregnating apparatus of the present invention by the present inventors and the conventional resin impregnating apparatus will be described. Brominated epoxy resin (epoxy equivalent 500,
Average molecular weight 1000) 100 parts (parts by weight, the same applies hereinafter),
3 parts of dicyandiamide, 0.17 part of 2-ethyl-4-methylimidazole, 25 parts of ethylene glycol monomethyl ether and 140 parts of aluminum hydroxide are mixed to prepare a resin varnish, and the temperature is 30 ° C. and the viscosity is 300 mPa · s. Using a filler-containing epoxy resin varnish that was adjusted and managed by adding methyl ethyl ketone as described above, a prepreg was produced by the resin impregnating apparatus of the present invention shown in FIG.
A B-type viscometer model BL manufactured by Tokyo Keiki Seisakusho Co., Ltd. was used to measure the viscosity. Moreover, the measurement conditions were measured at 30 rpm using a No. 2 rotor.

A resin varnish similar to that used in the above experimental example was used, and a prepreg was prepared as a comparative example by the conventional resin impregnating apparatus shown in FIG. The viscosity change of the resin varnish in the impregnation tank 1 was measured at each elapsed time when the prepreg was continuously manufactured by both devices. The measurement results are shown in Table 1. The unit is mPa · s.

[0012]

[Table 1] Table 1

According to the results shown in Table 1, in the resin impregnating apparatus of the present invention, the base material 6 serves as a baffle plate, and the resin varnish is difficult to circulate in the impregnation tank 1 and is easily stagnant (a portion 8 in the figure). It was found that the resin varnish 3 whose temperature and viscosity were controlled was forcibly circulated and the resin varnish was uniformly circulated in the impregnation tank 1.

[0014]

As described above, according to the present invention,
Even if the high-viscosity resin varnish dropped off by the coating amount control device drips, it does not stay in one place in the impregnation tank, and the circulation of the resin varnish in the impregnation tank becomes uniform,
The viscosity of the resin varnish can be stabilized. Therefore, the resin difference between the front and back surfaces of the prepreg can be reduced, and warpage of the laminated plate can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a resin impregnating apparatus of the present invention.

FIG. 2 is a schematic configuration diagram of a jet resin varnish supply port and a high viscosity varnish extraction port.

FIG. 3 is a schematic configuration diagram showing a conventional resin impregnation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Impregnation tank, 2 ... Resin varnish supply device, 3 ... Resin varnish, 4 ... In-tank roll, 5 ... Coating amount control device, 6 ... Base material,
7 ... Liquid sending port, 8 ... In-tank roll contact side, 9 ... In-tank roll non-contact side, 10 ... Jet resin varnish supply port, 11 ... High viscosity resin varnish extraction port.

Claims (4)

[Claims] 1. A resin impregnation device for supplying a resin varnish from a resin varnish supply device into an impregnation tank to impregnate a base material with the resin varnish, wherein a resin varnish supply port is provided on a bottom wall surface of the impregnation tank. A resin impregnating apparatus having a discharge port for taking out highly viscous resin varnish in a central portion of a portion of the impregnation tank where the resin varnish is likely to stay. 2. A resin varnish supply device is used to control the temperature in the impregnation tank,
In a resin impregnation device that supplies a resin varnish whose viscosity is controlled and impregnates a substrate with the resin varnish in the impregnation tank, a resin varnish supply that feeds the resin varnish from a resin varnish injection port provided on the wall surface of the impregnation tank. A mouth is provided, and the base material serves as a baffle and has a discharge port for sucking up the resin varnish from a portion where the resin varnish formed in the impregnation tank is difficult to circulate and easily accumulates, and takes out the resin varnish. Resin impregnation equipment. 3. The viscosity (η ¹ ) mPa · s of the resin varnish whose temperature and viscosity are controlled from the resin varnish supply device according to claim 2, and the substrate serves as a baffle plate. The viscosity (η ² ) mPa · s (η ¹ ) / (η ² ) of the resin varnish at the portion where the formed resin varnish is likely to stay is 1.0.
The resin impregnating device is characterized in that it is 0 / 0.95 to 1.00 / 1.00. 4. The method according to any one of claims 1, 2 and 3,
A resin impregnating device, wherein the resin varnish contains a filler.