JPS6090757A - Manufacture of laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminate used in electronic equipment and industrial equipment, and its purpose is to uniformly impregnate a base material with a resin, thereby improving the production of a laminate. The purpose is to improve warpage and improve electrical insulation.

Conventionally, glass nonwoven fabrics, glass-paper mixed nonwoven fabrics, and the like have been known as base materials used for laminates. The nonwoven fabric is generally supplied as a roll, and there are differences in the extent to which physical force is applied due to the winding and in the moisture absorption content between the ends and the center in the width direction, or in the machine direction. There are drawbacks such as uneven impregnation in the width direction and flow direction during impregnation, and furthermore, the ends of the prepreg in the width direction curl after impregnation and drying, and laminates using this prepreg have large warps at the ends and poor electrical insulation properties. There were problems such as variations. In order to improve this drawback, we have developed a method of reducing impregnation unevenness by using a large amount of resin diluting solvent during impregnation to reduce impregnation unevenness, or by adjusting the tension of the edge of the substrate during impregnation drying, or by mechanically Methods of suppressing curling at the ends are being considered.

However, in the former case, a large amount of solvent is required and there are problems with economic efficiency, as well as deformation due to partial physical force (specifically, the central part of the winding is compressed) and moisture absorption differences (specifically, (Moisture absorption is higher at the outer side and end of the winding), which results in warpage of the laminate and does not lead to improvement in insulation. In the latter case, it is extremely difficult to partially adjust the tensile strength, and there is a problem that the base material breaks during continuous impregnation, making it impossible for mass production.

The present invention aims to improve such drawbacks by pre-wetting a glass nonwoven fabric or a glass-paper mixed nonwoven fabric base material in order to equalize the moisture content of the base material. After adjusting the amount to 3 to 10% by weight, a prepreg obtained by impregnating and drying a thermosetting resin is used for lamination molding.

The details of the present invention will be explained using an example.

In FIG. 1, a glass nonwoven fabric or glass-paper mixed nonwoven fabric base material 2 is pulled out from a roll 1 and passed through a steam or spray water generating furnace 3.

At this time, it is preferable to heat the base material, and the treatment time is selected so that the physical deformation of the base material can be alleviated and the water content is uniform, so that the water content in the base material 2 is 3 to 10% by weight. You need to adjust it so that it is %. If it is less than 3% by weight, sufficient relaxation of deformation cannot be achieved and it is difficult to adjust the moisture content uniformly. In addition, if it exceeds 10% by weight, the subsequent impregnation with the thermosetting resin cannot be achieved at an economical impregnation speed, resulting in a decrease in electrical properties (
. That is, in the present invention, the glass nonwoven fabrics and glass-paper mixed nonwoven fabric substrates available in general markets are all rolled from the viewpoint of transportation and impregnation mass production, and the problems caused by the rolls are solved. The curling curl (distortion) and moisture absorption unevenness that are raised as a result of this process are alleviated and made uniform through wet treatment, and the warping of the prepreg and impregnation unevenness are eliminated, and the warpage and electrical properties of the final laminate are improved. It is.

Commercially available nonwoven glass fabrics or glass-paper mixed nonwoven fabrics can be used in carrying out the present invention. Further, the thermosetting resin can be selectively used by one-stage impregnation or two-stage impregnation, and water-soluble phenol resins, modified phenol resins, epoxy resins, etc. can be used.

Example As shown in FIG. 1, glass with a basis weight of 130 P/ff/
The paper mixed base material 2 was pulled out from the state of the roll 1 (2s o om), and held at a base material temperature of 50 ° C. for 3 minutes in a steam generating furnace 3, and after adjusting the water content to 7 ± 05 weight IIL96,
It was impregnated with a methylolated phenol resin solution in the first impregnating tank 4 and dried in the drying oven 7. Further, the prepreg 6 was impregnated with an epoxy resin in the second impregnation tank 5 and dried in the drying oven 8 to produce a prepreg 6 having the properties shown in Table 1. After cutting the prepreg, a 35μ thick copper foil was placed on one side of 8917 layers, and the prepreg was inserted into a press.

It was molded for 60 minutes at a pressure of 80 Kp/m and a temperature of 160° C., and then cooled to obtain a single-sided copper-clad laminate with a thickness of 1.6%. The properties of the laminate are shown in Table 2.

Comparative Example The base material 2 was pulled out from the same scroll 1 as in the example, and the
As shown in ζ, the base material was directly led to the first impregnating tank 4 and the second impregnating tank 5 without any wetting process, and was subjected to the same impregnating process with the same resin as in the example, and the properties shown in Table 1 were maintained. Prepreg 6' was manufactured. After cutting the prepreg, a single-sided copper-clad laminate with a thickness of 1.6% was obtained using the same configuration and pressing conditions as in the example. The properties of the laminate are shown in Table 2.

5-Table 1 The measured values in Table 1 are shown as the maximum and minimum values of the measured values of 20 samples, respectively.

The moisture content in the base material is the measured value after the wet treatment in Example 1, and the measured value after being pulled out from the roll in the comparative example. Further, the curl of the prepreg edge was determined by measuring the amount of rise of the end in the profit margin direction.

6- The measured values in Table 2 are shown as the maximum and minimum values of the measured values of 20 samples, respectively.

The amount of warpage A is the amount of lift in the center of a 330 x 330 mm sample piece cut from the corner of a 11000 x 1000 RI laminate, and the amount of warp B is the amount of rise in the center of a 330 x 330 mm sample piece cut from the center of the same laminate. The amount of lift at the center of the piece was measured.

In the above example, the laminate was constructed using only the base material subjected to the wet treatment, but the effect was also obtained with a laminate using this as a part and combining it with other base materials.

As shown in Table 1, the prepreg obtained by the method of the present invention has no curl phenomenon at the edges and less variation in the amount of resin. Its industrial value is extremely great in that it can produce a laminate with excellent quality stability and less variation in warpage in the center and less variation in electrical properties.

[Brief explanation of the drawing]

FIG. 1 is a simplified sectional view showing the prepreg manufacturing process of the laminate manufacturing method of the present invention, and FIG. 2 is a simplified sectional view showing the prepreg manufacturing process of the conventional laminate manufacturing method. 1 is a scroll, 2 is a base material, 3 is a steam acid spray water main furnace, 4 is a first impregnating tank, 5 is a second impregnating tank, 6 is a prepreg, 7.8 is a drying furnace Patent applicant

Claims (1)

[Claims] Part or all of the prepreg obtained by pre-wetting a glass nonwoven fabric or a glass-paper mixed nonwoven fabric base material to make the moisture content in the base material 3 to 10% by weight, and then impregnating and drying a thermosetting resin. A method for producing a laminate, characterized by lamination molding.