JPS62132950A - Composition for resin layer of vibration-damping metal plate - Google Patents

Abstract

PURPOSE:A composition, obtained by blending an ionomer resin with an elastomer, having both high shear tensile strength and T-peel strength and used as a resin in a vibration damping metal plate with improved adhesive force and processability. CONSTITUTION:A composition obtained by blending (A) an ionomer resin with (B) 2-30wt%, based on the component (A), polyisobutylene, 2-25wt%, based on the component (A), nitrile rubber (crosslinked type) or 2-25wt%, based on the component (A), ethylene-propylene rubber as an elastomer. Both components are kneaded by kneading rolls for 10min.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to a resin layer in a vibration-damping metal plate (hereinafter referred to as a vibration-damping metal plate) used as a damping material for a noise source. The present invention relates to a resin composition having excellent adhesive strength and processability.

BACKGROUND OF THE INVENTION In recent years, noise pollution has become a major social problem, and various soundproofing measures are being considered, especially in order to tighten noise regulations for automobiles. The use of damping materials for sound sources such as motors or parts that generate sound due to vibration is becoming more widespread.
Various vibration damping metal plates have been proposed so far.

These vibration-damping metal plates are required to have the following performance against noise generated from various noise sources in automobiles, ships, etc.

(1) When applied to engines, motors, etc., the environmental temperature during use is 60 to 100°C, and the vibration damping effect exists in this lkk degree range.

(2) It has excellent adhesive strength that can withstand extremely severe molding conditions during the manufacture of engines, motors, etc.

Problems to be Solved by the Invention However, the resin compositions used for the resin layers of conventional vibration-damping metal plates do not sufficiently satisfy such requirements in terms of adhesive strength. In other words, when molding automobile oil pans, etc., the shear tensile strength is 100 kg.
f/cm2 or more, and T peel strength is 15 kgf/2
5 mm or more is required.

Conventionally, the ionomer resin used for the resin layer of the distributed metal plate has strong adhesion to metal, and according to research by the present inventors, the shear tensile strength is 130 to 140 kgf/cm.
', but the T peel strength is 10kgf/25m
It is quite low, around m.

Means for Solving the Problems: As a result of various studies in order to obtain a resin composition for damping metal plates that has both high shear tensile strength and T-peel strength, the present inventors have developed an elastomer suitable for the ionomer resin. The present inventors have discovered that by kneading, the T-peel strength can be significantly improved while suppressing the decrease in shear tensile strength, and the present invention has been completed.

The present invention provides a composition for a resin layer inserted between vibration-damping metal plates, which is characterized by blending an ionomer resin with an elastomer. The ionomer resin used in the present invention has a fj higher than room temperature (20°C), (150
It has high vibration damping properties over the entire usage environment temperature range (up to 30°F (°C)), and has strong adhesion to metals. Examples of such ionomer products include NOIMILAN 1652 and 1702 manufactured by Mitsui Polychemical Co., Ltd.

Further, as the elastomer used in the present invention, polyisobutylene (PIr3), crosslinked nitrile rubber (N
B fl) and ethylene propylene rubber (EPR)
can be mentioned.

The blending ratio of the elastomer and ionomer resin in the resin layer varies depending on the type of elastomer blended, but is 2 to 30% by weight for PIB, and 2% by weight for crosslinked NBR, based on the stacking of the ionomer resin. ~25
% by weight, and in the case of EPrt from 2 to 25% by weight.

If the blending amount m of the elastomer resin is more than this, the shear tensile strength will decrease, while if the blending amount is less than this, the T-peel strength will decrease.

To produce the resin composition of the present invention, predetermined amounts of the ionomer resin and elastomer are kneaded for about 10 minutes using a kneading roll (roll surface temperature 100 to 110°C).

In order to produce a damping metal plate using the resin composition of the present invention, the composition is formed into a film with a thickness of 30 to 400 μm, preferably 50 to 150 μm, and a metal plate is thermally bonded to this film. For bonding, a film may be produced in advance and bonded to the metal plate, or it may be melt-extruded directly onto the surface of the metal plate using an extruder or the like, followed by thermal bonding.

The resin composition of the present invention is inserted between two or more metal plates to form a damping metal plate. The types of these metal plates are not particularly limited, and these metal plates may be the same or different types of metal plates. Examples of such metal plates include steel plates (surface-treated steel plates,
(including stainless steel plates, etc.), aluminum plates, copper plates, and surface-treated plates thereof.

Therefore, the present invention has the advantage of improving tensile strength and
A resin composition for damping metal plates with a peel strength as high as 6 can be obtained. By using the resin composition of the present invention as a resin layer of a vibration-damping metal plate, the T-peel strength can be significantly improved without reducing the shear tensile strength.

Koi carp Next, the present invention will be explained in more detail based on Examples.

In the examples, all percentages refer to percentages by weight.

Example! A cold-rolled steel plate of 0.8 x 200 x 250 mm was used as the metal plate. On the other hand, for the laminated resin layer, an ionomer resin (Himilan 1652, manufactured by Mitsui Polychemical Co., Ltd.) was used as a base resin, and the elastomer shown in Table 1 was added thereto.

A 10,071 m thick substrate and the resin were sandwiched between the two plates, and heated at 170°C for 30 minutes using a surface pressure press.
Heat and pressurize for 5 minutes at kgf/cm2.

A rectangular sample was prepared from this damping material, and a vibration damping test was conducted by the resonance method using a towline elastic modulus manufactured by B & Co., Ltd. and a +t1 constant device. In addition, the adhesive strength was measured using the JIS method (shear tensile strength: JIS K6850, 'r peel strength: 1
It was held in 1854).

The obtained results are shown in FIGS. 1 to 4 (damping properties) and Table 1 (shear tensile strength, 'I' peel strength) below.

Figure 1 shows polyisobutylene (PIB), Figure 2 shows ethylene propylene rubber (EPr()), Figure 3 shows nitrile rubber (NBR) crosslinked type, and Figure 4 shows NBR non-crosslinked type elastomers. It is a graph comparing the damping properties of a damping metal plate using a resin layer made of resin as a base resin with the damping properties of a damping metal plate using a resin layer made only of a base resin.

Figures 1 to 4, 1: As is clear, 1 page indicates that the ionomer is dead. 113. When EPR and NBR elastomers are blended, vibration damping properties from room temperature (20°C) to around 40°C are improved. That is, by adding the elastomer, a vibration-damping metal plate whose damping properties are less dependent on temperature can be obtained than when the base resin is used alone.

Furthermore, as is clear from Table 1, the elastomers added in the resin include r'lB, El''R, and crosslinked Nr3R.
In this case, compared to the case without the added elastomer, the shear tensile strength is slightly lower, but the degree of peeling is significantly improved by 1°, and the adhesive strength is excellent overall. In contrast,
When non-crosslinked NBR is used, although the peel strength is greatly improved, the shear tensile strength is significantly lowered and the adhesive strength as a whole does not have favorable performance.

Therefore, according to the vibration-damping metal forming resin composition of the present invention, by adding a predetermined amount of the elastomer to the ionomer resin, the degree of peeling can be significantly increased by 1. The processability of damping metal plates can be significantly improved.

Table 1 is a graph comparing a damping metal plate having a resin layer made only of resin.

Patent Applicant: Kobe Steel, Ltd. 3 other representatives Patent attorney ± 11 yen Yamaboshi 2 others 1st figure * ("C1 2nd figure 1 degree 1'cl

Claims (2)

[Claims] (1) A composition for a resin layer of a vibration-damping metal plate, which is characterized by blending an ionomer resin with an elastomer. (2) Item (1) above, wherein the elastomer is 2 to 30% by weight of polyisobutylene, 2 to 25% by weight of nitrile rubber (crosslinked type), or 2 to 25% by weight of ethylene propylene rubber based on the weight of the ionomer resin. Composition of.