JPS6129537A - Molded soundproof material with note sticking section and manufacture thereof - 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 molded soundproofing material having a gold X-foil notes attached portion attached to the back side of an automobile hood, and a method for producing the molded soundproofing material.

On the back of a car's bonnet, precautions regarding ``loitering regulations'', ``periodic inspections'', ``engine oil'', etc., are usually attached as notes (common plates) printed on aluminum foil. ing.

In recent years, the noise inside the engine room of a car has generally been considered a problem as one of the noise pollution outside the car, and manufacturers have also made various efforts to deal with this problem. An increasing number of car models in the US are equipped with soundproofing materials. The molded soundproofing material attached to the back of the bonnet is a bulky nonwoven fabric made of organic discontinuous fibers containing thermosetting resin, or a breathable material with functions such as decorativeness and water resistance that is based on glass wool mat. Molded soundproofing materials are used, which are made by laminating layers of different skins and molding them under heat and pressure. The molded soundproofing material is subject to restrictions on the back of the bonnet and various equipment in the engine room, and for example, the shape of the molded soundproofing material is limited so as not to cover up the notes affixed to the back of the bonnet. Ta.

However, there is a strong demand for quiet cars,
In order to satisfy these demands, the area of the molded soundproofing material would have to be expanded, and for this reason, the notes, which were normally pressed and pasted to the steel plate on the back of the bonnet, were attached to the surface of the molded soundproofing material. It became necessary to paste it. However, the contact area between the soundproof material skin and the adhesive surface on the back of the notes is extremely small, and the soundproof material skin is soft.
A mold release agent such as silicone is usually coated on the mold to release the mold from the mold, so some mold release agent adheres to the surface of the molded soundproofing material, causing unnecessary In other words, the soundproofing material that covers the entire back of the bonnet, which effectively suppresses external noise inside the engine compartment, has a disadvantage in that the notes cannot be directly attached, and improvements are desired. .

In order to solve the drawbacks of such molded soundproofing materials, it has been proposed to fuse a thermoplastic film to the desired area on the surface of the molded soundproofing material where the notes are to be pasted, and then press and paste the notes thereon. , depending on the method, the generally accepted adhesion strength (1
, OKg/25a+m) is not satisfied, to 0.5/0.7
It had an adhesion strength of only 725 mm (kg) and could not be put to practical use.

In addition, the inventors of the present invention previously discovered that a coating can be applied to the surface of a soundproofing material to make the surface smooth and a note can be firmly attached. However, the adhesive strength is 1.0Kg/
Although it satisfies the requirement of 25 mm, the coating is absorbed into the soundproofing material rapidly, and the process of applying and drying must be repeated several times to ensure a coating amount of approximately 200 g/l112 (solid content) or more, which is extremely complicated. It had the disadvantages of poor workability (and not being economical).

In addition, it is not affected by gasoline, is heat resistant, moisture resistant,
In addition, there is a growing demand for a notes affixing part with excellent water resistance, and it is currently difficult to meet this demand with coating alone.

As a result of intensive research to improve the above-mentioned drawbacks and satisfy the above-mentioned needs, the present inventors have developed a molded soundproofing material that is not susceptible to gasoline and has excellent heat resistance, water resistance, and moisture resistance. We have developed a film layer that firmly adheres to the surface of the skin, and also to which the notes adhere firmly, solving the disadvantage of poor workability and economy of applying a large amount of coating over several times as in the past. To provide a molded soundproofing material having a note-attached part that exhibits good gasoline resistance, heat resistance, moisture resistance, and water resistance as well as a method for manufacturing the molded soundproofing material using an extremely simple process. be.

That is, the gist of the present invention is to form an integrated film layer made of a 2N polyester film on a molded soundproofing material made of a bulky nonwoven fabric containing a thermosetting resin and a skin material as a molded soundproofing material. The molded soundproofing material has a part for attaching notes, and as a simple manufacturing method for the molded soundproofing material, a skin material is laminated on a bulky nonwoven fabric containing a thermosetting resin, and then pressure molded. A method for manufacturing a molded soundproofing material having a note sticking part formed by heat-pressing an integrated film layer made of two layers of polyester film on a molded soundproofing material, and a bulky material containing a thermosetting resin. After laminating the skin material on the nonwoven fabric, an integrated film layer consisting of two layers of polyester film is placed, and the film layer is heat-pressed at the same time as the molded soundproofing material is pressure-molded to attach the notes. A method of manufacturing a molded soundproofing material having a part.

Below, a detailed explanation will be given of the essential components of the molded soundproofing material having a note sticking part according to the present invention.

First, the base material constituting the molded soundproof material of the present invention is a bulky nonwoven fabric containing a thermosetting resin, such as animal-based woven fabrics such as wool, cotton, flax, hemp, vegetable woven fabrics, and lath wool. , mineral fibers such as rock wool and asbestos fibers,
and one or more types of discontinuous m-fiber materials such as viscose rayon, acetate, acrylic, nylon 1, polyester, etc., and heat-based materials such as phenol-based, acrylic-melamine-based, polyester-based, epoxy-based, etc. It may be made of a curable resin, and the thermosetting resin powder of the resin type may be added in an amount of 50 to 97 parts by weight of the fibrous material.
3 parts by weight of the mixed thermosetting resin, and the mixed thermosetting resin must be molded as 7 leases with at least a portion of it uncured.

The skin material that forms the molded soundproofing material together with the above-mentioned bulky nonwoven fabric preferably has air permeability so as not to impede the sound absorption properties of the molded soundproofing material, and in addition has properties such as water resistance, oil resistance, and abrasion resistance. For example, what is called resin cotton can be used.

Resin cotton is a synthetic fiber 7 lease impregnated with a thermosetting resin, and the synthetic fiber that can be used for the synthetic fiber 7 lease should have a relatively high softening point and relatively low water absorption, such as Polyester WLM! ,, polyamide fiber,
Xiaomi also mentions acrylic fibers, etc.

Next, the sticking part of the notes according to the present invention has a structure in which two pieces of polyester film are integrated, one film side is firmly adhered to the notes, and the other film side is made of a skin material. By firmly adhering to the material, a satisfactory effect can be achieved as a part for pasting notes on the soundproofing material.

The polyester film in contact with the surface material has a thickness of 1
The adhesive film has a thickness of 0μ or more, and if it is less than 10μ, it lacks adhesiveness and there is a risk that the film will be torn. 10μ
If it is above, it can be preferably used and also has good adhesive properties. Although there is no particular upper limit, a film with a thickness exceeding 50 μm is economically unfavorable.

There is no limit to the thickness of the polyester film in contact with the back side of the note, and a film with excellent properties such as gasoline resistance and heat resistance should be used.

In the note sticking section having such a structure, polyester films are sequentially placed and integrated by heating. The integrated film layers are then stacked one on top of the other and punched out using a trim die having the desired shape of the attachment portion.

In order to form a note sticking part made of the film layer obtained in this way on a molded soundproofing material, a bulky nonwoven fabric and a skin material are laminated on the lower die of a molding die, and after heating and pressure molding, the desired part is The notes sticking part can be formed by heat-pressing the notes sticking part, or 82 layers of bulky nonwoven fabric or skin material can be formed on the lower die of the molding die, and the notes sticking part can be placed at the desired position from the beginning. At the same time as the molded soundproofing material is heated and pressure molded, the notes pasting section is formed by heat and pressure bonding.

The notes may be pasted by pressing the notes on a molded soundproofing material and then attaching the molded soundproofing material to the back of the hood of the car; or ,
The molded soundproofing material having a note-adhering part according to the present invention is formed by attaching the molded sound-insulating material to the back of the bonnet and then press-sticking it to the note-adhesive part. It is used and notes are attached.

The molded soundproofing material of the present invention, which allows for an expanded mounting area, has far superior sound absorption effects compared to conventional products.
It is a molded soundproofing material with excellent physical properties such as gasoline resistance and heat resistance, which allows notes to be firmly attached to the desired area, and is also economically efficient. be. Furthermore, the present invention also proposes a method for obtaining such a molded soundproofing material through a simple process.

Examples and comparative examples are given below to provide a more detailed understanding of the present invention. Naturally, the present invention is not limited to the following examples.

Example 20 parts by weight of recycled wool, 5 parts by weight of fallen cotton, and 30 parts by weight of 7-el resin (curing temperature 150°C) were defibrated and mixed, passed through a heating furnace at 140°C, to a thickness of 40 mm and an areal density of 680 g/m2. A bulky nonwoven fabric was obtained.

The bulky nonwoven fabric was placed on a mold that had a shape similar to that of a car hood, and then resin cotton made of polyester fiber 7 lease, which was approximately the same size as the bulky nonwoven fabric, was laminated as a skin material and heated at 200°C. 10kg/C at mold temperature
A molded soundproof material was obtained by applying a pressure of 112 for 1 minute.

From the top layer, polyester film, melting point 100℃, thickness 2
A film layer made of a 0μ adhesive polyester film was placed on the molded soundproofing material and heated and pressed to form a note-attached portion.

Comparative Example A 20 μm thick polyester film was fused onto the same molded soundproofing material as used in the example to form a note sticking area.

Test method (1) Adhesive strength test Measurement and comparison were performed using the 180 degree peel test method specified in JIS K 6854.

(2) Gasoline resistance test After being immersed in gasoline for 1 hour, it was subjected to a peel test.

In addition, 25. The method of applying pressure when pasting the notes cut into the n+7m area was to lightly adhere them to the extent that they were aligned and then roll a roll weighing 2 kg in one direction.

Measurement results Adhesion strength Gasoline resistance example 1.1kg725mm O, 8kg/2
5n+n comparative example 0.4kg/25mm' 0.2
kg/25 mm or more, it was revealed that the molded soundproofing material of the present invention was excellent in both the adhesion strength of the notes and the gasoline resistance to the part where the notes were reattached.

Claims (1)

[Claims] 1. An integrated film layer made of two layers of polyester film is formed on a molded soundproofing material made of a bulky nonwoven fabric containing a thermosetting resin and a skin material. A molded soundproofing material 2 having a feature where notes are attached, a skin material is laminated to a bulky nonwoven fabric containing a thermosetting resin, and then pressure molded, and two layers of polyester are placed on the molded soundproofing material. Manufacturing method 3 of a molded soundproofing material having a notes pasting part characterized by heat-pressing an integrated film layer made of a film, laminating a skin material on a bulky nonwoven fabric containing a thermosetting resin After that, an integrated film layer made of two layers of polyester film is placed, and the film layer is heat-pressed and bonded at the same time as the pressure molding of the molded soundproofing material. Method for producing molded soundproofing material having