JPH0661856B2 - Method for producing fiber-reinforced resin foam - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a fiber-reinforced resin foam.

[Conventional technology]

BACKGROUND ART Heretofore, a fiber-reinforced resin foam plate formed from an acid-curing phenol resin as a main material has been known as a lightweight and flame-retardant synthetic resin wall plate.

The production of this fiber-reinforced resin foam plate is generally carried out by impregnating a nonwoven fabric with an acid-curable phenolic resin using an SMC impregnation machine (for example, JP-A-62-7510 and JP-A-63-172634), and stacking a plurality of layers. It is in the form of a mat, and it is fed between two so-called double conveyors in which two belt conveyors are arranged facing each other with a certain interval, and is heated and foamed here to regulate the plate thickness by the facing distance between the double conveyors, and a plate material of a predetermined shape Was obtained (for example, JP-A Nos. 63-172633 and 166504).

[Problems of conventional technology]

By the way, in the case of the above-mentioned manufacturing method, since the foaming of the mat occurs in the entire inside of the tissue, air bubbles are naturally generated on and near the surface of the plate material, which may impair the appearance of the plate material. Also, there was a drawback that the paint did not ride well due to the exposed bubble marks.

Further, there is a defect that the surface hardness becomes low due to the foaming of the surface and the chip may be damaged or broken even with a slight impact.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention aims to obtain a method for producing a fiber-reinforced resin foam in which surface hardness and averageness are sufficiently improved and coating can be easily performed while using the same production apparatus as the conventional one. It was made.

[Technology that has solved the problem]

That is, the method for producing a fiber-reinforced resin foam of the present invention, the non-woven fabric laminate impregnated with the foaming resin, before being sent to the foaming double conveyor provided with the running surfaces facing each other, on the surface of the laminate is It is characterized in that a resin compound having the same quality as the foaming resin is sprayed.

[Action]

In the present invention, as the means for producing the fiber-reinforced resin foam, it is premised that the conventional means for laminating a conventional SMC laminate and foaming while controlling the plate thickness between the double conveyors is used. Before feeding the nonwoven fabric laminate to the double conveyor, the same kind of resin as that impregnated into the nonwoven fabric is sprayed in layers to form a so-called skin layer.

Therefore, when foaming occurs in the double conveyor, the surface layer portion becomes a resin rich layer and has a smooth surface.

The resin to be sprayed may be either a foaming resin or a homogeneous resin that does not foam.

〔Example〕

 Next, an embodiment of the present invention will be described.

FIG. 1 shows a side view of an apparatus for carrying out the present invention. First, an SMC impregnating machine 1 is used to impregnate a 0.5 mm-thick non-woven fabric with an acid-curable phenol resin for foaming, and 6 sheets of this are laminated, The resin was transferred by the conveyor 2, and the resin was evenly sprayed onto the surface of the laminate 3 by the spray 4, and then fed into the double conveyor 5 and foamed to produce a plate material.

Further, a homogeneous resin containing no blowing agent as a spraying resin was sprayed in the same manner to manufacture a plate material similar to the above.

The surface of each molded plate is extremely hard on average,
An excellent paintability and strength were obtained.

〔effect〕

As described above, according to the present invention, the same resin is separately sprayed on the surface of the main body to be foamed, and this is used as the skin layer, so that the foamed bubbles hardly open and leave bubble marks on the surface, and the subsequent coating The process can be performed smoothly, and inconveniences such as surface damage can be eliminated.

[Brief description of drawings]

 FIG. 1 is a side view of an apparatus for carrying out the present invention.

Claims (1)

[Claims] 1. A nonwoven fabric laminate impregnated with a foaming resin,
A method for producing a fiber-reinforced resin foam, which comprises spraying a resin mixture of the same quality as the foaming resin onto the surface of the laminated body before sending it to a foaming double conveyor having traveling surfaces opposed to each other.