JPH0722938B2 - Method for manufacturing sound absorbing and heat insulating material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a sound absorbing and heat insulating material used for a box body of a silencer or the like.

(Prior Art) Equipment that requires sound absorbing performance as well as sound absorbing performance such as a muffler box body is composed of a sound absorbing heat insulating material of a composite material in which an inorganic fiber body such as glass wool and a thermosetting resin are composited. . In recent years, such a silencer box body is composed of a laminated composite material in which composite materials having different composition of constituent materials are laminated, and a composite material having a large composition ratio of an inorganic fibrous body is formed on an inner wall that defines a silencer chamber. Use to improve sound absorption performance,
The rigidity of the structure is maintained by using a composite material having a large composition ratio of thermosetting resin for the outer wall.

Conventionally, as such a sound absorbing heat insulating material, those described in JP-A-58-15883 or JP-A-59-200297 are known, and JP-A-61-41525 or JP-A-61-41525. Akira
It is manufactured by the method described in JP-A-61-144317. For example, in the manufacturing method of JP-A-61-41525, the mat-shaped fibrous body is placed in a substantially horizontal state, and another fibrous body impregnated with a molding agent is superposed on the lower surface of the fibrous body, and these fibrous bodies are formed. It is designed to be pressed by a mold.

However, the composite material in which the composition ratio of the inorganic fiber body is large is fragile and may be peeled off by vibration. Therefore, in the above-described exhaust silencer, a bush made of a heat-resistant elastic material such as silicon rubber is provided between the exhaust pipe for guiding the exhaust gas from the engine and the box, and the bush is transmitted to the box. Engine vibration is reduced. And
The bush as described above is fixed to the box body with an adhesive, and is prevented from falling off due to vibration or the like.

(Problems to be Solved by the Invention) However, in the above-described exhaust silencer, since the bush must be attached to the box body with an adhesive, the attachment strength of the bush is the adhesion surface of the bush or the box body. There is a problem that it is difficult to obtain a stable quality because it is easily affected by the surface roughness of the adhesive surface.

The present invention has been made in view of the above problems, and provides a method for manufacturing a sound absorbing heat insulating material capable of firmly and reliably joining a resin such as a composite material, and stabilizing the quality of the sound absorbing heat insulating material. To aim.

(Means for Solving Problems) The present invention relates to a method for producing a sound heat insulating material by laminating resin-based composite materials, wherein the first inorganic fibrous body formed in a mat shape has a first thermosetting property. A step of manufacturing a first impregnated body by impregnating with a resin, a step of molding the first impregnated body into a molded body of a predetermined shape while heating and pressurizing the first impregnated body, and a second inorganic material molded into a mat shape Manufacturing a second impregnated body by impregnating a fibrous body with a second thermosetting resin having a composition different from that of the first thermosetting resin; and A step of forming a coating layer of a thermosetting resin, a step of bringing the second impregnated body into contact with the coating layer of the molded body, and molding the molded body and the second impregnated body while heating and pressing the same. The point is to include.

(Operation) According to the method of manufacturing the sound absorbing and heat insulating material of the present invention, the first
A heat-curable resin coating layer is formed on the molded article obtained by heating and pressurizing the above-mentioned impregnated article, and the second impregnated article is brought into contact with the coating layer of this molded article to form the second impregnated article and the molded article. And are pressed and heated to integrally mold them. For this reason, these can be firmly and reliably bonded regardless of the surface roughness of the bonding surface, etc., and stable quality can be obtained even in mass production.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 (a) to 1 (j) show a method of manufacturing a sound absorbing and heat insulating material according to an embodiment of the present invention, and are cross-sectional views of the sound absorbing and heat insulating material in the manufacturing process.

First, as shown in FIGS. 1 (a) and 1 (b), the manufacturing method in this embodiment is a thermosetting elastic body in which a cotton body 11 of inorganic fiber such as glass wool is stored in a container 12. (1st thermosetting resin) is immersed in 13 L of silicone rubber solution, and the cotton body 11 is impregnated with 13 L of silicone rubber solution.
The impregnated body 14 is prepared. Next, as shown in FIG. 1 (C), while heating the first impregnated body 14, pressure is applied by the upper mold 15 and the lower mold 16 to mold, and as shown in FIG. 1 (d). The molded body 17 is manufactured. Subsequently, as shown in FIG. 1 (e), a predetermined surface of the molded body 17 is coated with a thermosetting resin (second thermosetting resin) such as unsaturated polyester with a brush 18 or the like. Form layer 19a.

On the other hand, as shown in FIG. 1 (f) and FIG. 1 (g),
Cotton body 20 made of glass wool or other inorganic fiber in a matte shape
A solution of an unsaturated polyester resin (hereinafter abbreviated as polyester), which is a thermosetting resin, stored in a container 21
Then, the cotton body 20 is impregnated with the polyester solution 19L to form a second impregnated body 22. Then, as shown in FIG. 1 (h), polyester 19L is applied to the upper surface of the second impregnated body 22 with a brush 23 or the like to form a coating layer 19b. Next, as shown in FIG. 1 (i), a coating layer 19a is formed on the molded body 17 described above.
The second impregnated body 22 is overlaid on the above, and these are heated and pressed by the upper mold 24 and the lower mold 25 to mold. This time,
The second impregnated body 22 is firmly bonded to the molded body 17 by the polyester leached from the coating layer 19b and the polyester of the coating layer 19a of the molded body 17, and the silicone rubber layer 26a as shown in FIG. A sound absorbing and heat insulating material 26 is obtained as a finished product laminated with polyester 26b.

Since the sound absorbing heat insulating material 26 molded as described above does not use an adhesive whose adhesive strength is affected by the surface roughness of the adhesive surface, stable quality can be obtained.

(Effect of the invention) As described above, according to the method for manufacturing a sound absorbing and heat insulating material of the present invention, two resin materials having different compositions can be integrally and firmly bonded without using an adhesive,
Stable quality can be obtained.

[Brief description of drawings]

FIG. 1 shows a method of manufacturing a sound absorbing and heat insulating material according to an embodiment of the present invention, and is a sectional view of the sound absorbing and heat insulating material in the manufacturing process. 11 …… Cotton body 13L …… Silicon rubber solution 15 …… Upper mold 16 …… Lower mold 17 …… Molded body 19a …… Coating layer 19b …… Coating layer 19L …… Polyester solution 20 …… Cotton body 22 …… No. 2 Impregnated body 24 …… Upper mold 25 …… Lower mold 26 …… Sound absorbing heat insulating material 26a …… Silicone rubber layer 26b …… Polyester layer

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area B29L 31:00

Claims (1)

[Claims] 1. A method of manufacturing a sound absorbing and heat insulating material, which comprises laminating a resin-based composite material, wherein a first thermosetting resin is impregnated into a mat-shaped first inorganic fibrous body to form a first impregnation. A step of producing a body, a step of molding the first impregnated body into a molded body of a predetermined shape while heating and pressurizing the first impregnated body, and the first thermosetting to a second inorganic fibrous body molded in a mat shape. Of a second thermosetting resin having a composition different from that of the thermosetting resin to produce a second impregnated body, and forming a coating layer of the second thermosetting resin on a predetermined surface of the molded body. And a step of bringing the second impregnated body into contact with the coating layer of the molded body to mold the molded body and the second impregnated body while heating and pressurizing the molded body and the sound absorbing heat insulation. Method of manufacturing wood.