JPS6299140A - 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 Industrial Application W+ The present invention relates to a method for producing a glass nonwoven fabric base laminate with excellent properties.

BACKGROUND OF THE INVENTION In recent years, laminates have been widely used in which glass nonwoven fabric is used as a base material, and prepreg obtained by impregnating and drying this (as a thermosetting resin with epoxy resin) is formed into end layers. , usually cut the glass/fiber to an appropriate length,
It is made by dispersing it in water and making it on a net that runs down.Glass 4#1. As the male binder, there are two types that use organic binders such as epoxy resin and acrylic resin, and those that use cellulose fiber binders such as softwood and hardwood bulbs. f)
), each has a deficiency 4'P ○While the invention will solve the problem, one of the disadvantages of organic binders is that organic binders that can be applied in the papermaking process are inherently susceptible to thermal softening. , when impregnating the thermosetting resin 7 and forming the end layer, under normal high pressure conditions,
Its function as a binder decreases. In other words, the force between the fibers cannot withstand the flow of the thermosetting resin, and the glass fibers move with the flow of the resin and fold the nonwoven fabric, so it is necessary to mold at low pressure. Therefore, only a four-layer version with many voids can be obtained.

In addition, when applying a cellulose fiber binder, natural cellulose with a length of about 0.5 to 10 pieces is usually mixed with glass fibers, but the glass nonwoven fabric has the strength to not break during the bottom forming process of the laminate. The length of the descent is usually 20~40.
t% of cellulose fibers, and mixing a large amount of cellulose fibers will lead to a decrease in the moisture resistance of the laminate. In view of the above, the present invention has been developed to provide a method for producing laminates using glass nonwoven fabric as a base material. In manufacturing, the aim is to produce a laminate that does not cause glass nonwoven fabric breakage during the bottom forming process and has excellent moisture resistance. Means to solve the above objective r2! ! In contrast, Gl of the present invention is obtained by impregnating and drying a glass fiber nonwoven fabric with a thermosetting resin using an organic binder or a cellulose fiber binder,
In the construction of a laminated board in the form of 111 g of this material, it is characterized in that ochrofibrillated cellulose is contained during the production of the lath fiber nonwoven fabric.

What is microfifurylated cellulose? Is it processed into natural cellulose? In addition, it has been refined down to black fibrils, and has a very large surface area and pore volume, 50 to 100 times that of normal pulp. Normally, cellulose is the main component of plant cell walls such as cotton, hemp, and wood. It is a fibrous plant, which makes up 10 to 40% of the plant body, and has a fibrous shape. Its structure is that cellulose molecules are grouped and arranged to form a single cecrofibril, which is then tied together to form fibrils, which in turn form fibers.

Therefore, the 5-crofibrillated cellulose retains the original shape of normal cellulose fibers to the extent that the degree of polymerization of cellulose is not reduced.

Since it is microfifurylated cellulose C (as described in I above), it intertwines well with glass fibers and can produce a large binder effect with a small amount of addition. When the thermosetting resin χ is impregnated, it can penetrate deep into the cellulose and is well wetted by the resin, so there is a risk that the addition of old clofibrillated cellulose and C may reduce the moisture resistance of the laminate. There is no such thing.

When a glass fiber nonwoven fabric with an organic binder contains microfifurylated cellulose χ, the tensile strength of the glass fiber nonwoven fabric is increased without any deterioration of the properties of the #M plate, and it is In addition, by adding microfifurylated cellulose to glass fiber nonwoven fabrics made of cellulose fiber binders, even if the mixing ratio of cellulose fiber binders is lowered, sufficient tensile strength can be maintained at all. By lowering the mixing ratio of the cellulose fiber binder, the moisture resistance properties of the laminate can be improved.

Examples: Glass fiber non-woven fabric containing epoxy emulsion binder, which is most frequently used as an organic binder, approximately 100% Ovt, ζcrofibrillated cellulose T3-5wt
By adding about % to the properties of the laminate? Eliminates nonwoven fabric breakage during high-pressure molding without causing any harm. In addition, in the case of glass fiber nonwoven fabrics with cellulose fiber binders, which are usually mixed with about 20 to 40 wt%, it is recommended to add about 1 to 3 wt% of ochrofibrillated cellulose.
While maintaining the same tensile strength, it is possible to reduce the mixing ratio of cellulose fiber binder to about 3 to 5 W℃%, and 1
Significantly improves the moisture resistance of the 11-layer board.

The glass fibers used in the glass fiber nonwoven fabric used in the present invention are generally glass fibers, but they have excellent electrical properties and other types of glass fibers can also be used.

Methods for producing glass R fibers include cutting long fibers by melt spinning into lengths of about 5 to 20X, and directly obtaining short fibers by centrifuging or blowing molten glass. , non-limiting to any method Example 1 Epoxy emulsion total binder and shite 10w1. A prepreg was obtained by impregnating a glass fiber nonwoven fabric with 4 wt % of clofibrillated cellulose with epoxy resin to a resin amount of 60 wt % and drying. This prepreg was layered and heated and pressure molded at a temperature of 160°C and a pressure of 5oKf/- for 30 minutes to a thickness of 1.5%. A zJ-soaked laminate was obtained.

Example 2 A glass fiber nonwoven fabric containing 5 wt % of cellulose fibers as a binder and 2 wt % of dichlorofibrillated cellulose was used, and a thickness of 1.6 was prepared in the same manner as in Example 1.
X (to obtain D product 1-plate.

Conventional Example 1 A glass fiber nonwoven fabric containing 10 wt% of epoxy emulsion as a binder was used in the same manner as in Example 1, except that the molding pressure was Y15Kt/- and °C1 thickness was 1.6Xt/
) A laminate was obtained.

In the same case, when the molding pressure was set to ysOKf/-, the nonwoven fabric broke significantly and a proper laminate could not be obtained. Same as 1, thickness 1
．． Table 1 shows the characteristics of the f*J-board in the Example and Comparative Example in which the 6 They are shown in Table 2.

Table 1 I counted a.

Effects of the Invention As described above, according to the present invention, since the hot strength of the glass fiber nonwoven fabric is high, the nonwoven fabric can be molded under high pressure without causing breakage, and a laminate with fewer voids can be obtained. In addition, since the resin has good permeability into the glass fiber non-woven fabric, it is possible to create a laminate with excellent moisture resistance. By adding q f, the nonwoven fabric becomes 1111 dense!The degree increases, so when impregnating the resin face into the glass fiber nonwoven fabric, the solid content of the resin face can be lowered to a high degree, and the solvent can be used accordingly. Leads to a reduction in volume.

patent applicant

Claims (1)

[Claims] In the production of a laminate in which a glass fiber nonwoven fabric with an organic binder or a cellulose fiber binder is impregnated with a thermosetting resin and dried to obtain a prepreg, and the prepreg is laminated and molded, microfifurylated cellulose is contained during the papermaking of the glass fiber nonwoven fabric. A method for producing a laminate, which is characterized by allowing the laminate to stand.