JPS6161846A - Vibration-damping steel plate - 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] [Technical Field] The present invention relates to structural members of vehicles, ships, machines, etc.
1iij) vibration damping' @ board, for river use.
Oil-resistant F1 for oil pans, cylinder head covers, safety plates, etc.
This invention relates to vibration-damping steel plates for structural members that require

[Prior art]

Conventionally, as a means of reducing vibration and noise generated from the above-mentioned T and RJ grooved parts and materials, a viscoelastic material was sandwiched between two steel plates as an intermediate layer.

A damper designed to absorb the vibration energy associated with steady vibration or impact and impact, and further convert it into thermal energy by the internal straw to attenuate the rl sound, that is, to have a vibration damping effect. Steel plates are well known, and generally resin-based viscoelastic bodies have been used.

As the required characteristics of the damping steel plate, the desired circumference ′e
, low temperature to high temperature e.g. O''C~100''C
It is preferable that the value of the loss coefficient η is large and kept constant over such a wide temperature range, and it is considered that there is no problem in practice if η is 0.03 or more.

[Problems to be solved]

However, the damping steel plates for structural members that require oil resistance as described above are viscoelastic bodies that have specific properties with excellent oil resistance.
It is necessary to use M resin, which not only limits the degree of freedom in design, but also has viscoelastic characteristics unique to the resin, that is, η has a sharp peak (maximum) near the glass transition temperature (Tg).
Therefore, the temperature range in which the damping effect is exhibited is narrow, and the temperature dependence of η is at most 7b.
If two types of resins with different .

In addition, generally speaking, the adhesive strength between resin and steel plate is not only low (T
Mold peeling strength is approximately 1 to 2 mm/cm (culm degree).

Strong against tension and compression, but weak against bending and peeling.
Furthermore, the resin flows at high temperatures (above the flow temperature), causing the steel plate to slip off, which is a serious problem in practice.

Based on the above circumstances, the present invention further provides that acrylonitrile-butadiene conjugate rubber (hereinafter referred to as NBR) is
'g is in the low temperature range (around -55 to -20'C), but η is broad over a wide temperature range, has little temperature dependence, and has excellent oil resistance;
is dependent on the elastic modulus (Young's modulus), and based on the knowledge that increasing the elastic modulus increases the value of η, the tax t! Vehicles, ships, etc. that were invented as a result of research.
For details on the structural parts of the machine, etc., see + 11T oil pan, cylinder head cover 1. ! Oil resistance is required for S panels etc., and for a wide temperature range from 0℃ to 100℃? The purpose of the present invention is to provide a vibration-damping copper plate that exhibits an excellent vibration-damping effect and has excellent durability without slipping of the steel plate at high temperatures.

[Solution]

In order to achieve this object, the present invention consists of a damping steel plate in which a damping steel plate is sandwiched between two steel plates by sandwiching a dry elastic body made of NBB and a non-PJ8 hardened phenol resin. It is.

NBR does not particularly limit its acrylonide IJ/l'-Fli- (hereinafter referred to as AON amount).

Considering oil resistance, a material with a weight ratio of about 30 to 50% is used. The peak temperature of η of such NBR is -25
It exists around °C-0'C.

Non-thermosetting phenol/L/resins include pure phenol, alkyl-modified phenol, cashew-modified phenol,
Novohook type phenol MJ such as Teno V ben modified phenol,! 10 to 90 parts by weight of NB is blended with 3100 parts by weight of NB.

In the present invention, we selected a non-thermosetting phenolic resin as the resin to be blended with NBB, and in addition to the fact that the phenolic resin itself has good compatibility with NBR, it also phenolic resin)
If you use

Heating accelerates curing, making the viscoelastic material too hard.
Although the desired vibration damping effect cannot be obtained, by blending a non-thermosetting phenolic resin in the specified M amount as described above, the elastic modulus is moderately increased, and the peak temperature of η is lowered from the total low temperature side to room temperature. It acts as if to shift it to the vicinity, and O'C~1
This is because the value of η can be maintained at 0.03 or more toward 00°C. In this respect, cashew-modified phenolic resin is preferable among the above-mentioned non-heat-transformable phenolic resins. In addition, if the amount of the semi-thermosetting phenolic resin is less than 10 parts by weight, the effect of shifting the peak temperature of η of NBB to the high temperature side (near room temperature) will be poor, and if it exceeds 90 parts by weight, the result will be a column-shaped viscoelastic material. The character of the product is damaged.

The temperature range in which the vibration damping effect is exerted becomes rapidly narrower.

The thickness of the steel plate is not particularly limited.

A relatively thin material of about 0.4 to 1.5 mm is used, and the thickness of the viscoelastic material depends on the thickness of the steel plate.

0.1-1. It is appropriately selected and used within a range of approximately Q m m.

Furthermore, the W4 plate and the viscoelastic body are bonded together by heating and vulcanization using a vulcanizing adhesive that has been applied to the surface of the steel plate in advance, resulting in a strong adhesive force with a T-peel strength of approximately 5 to 25"9/cm. and are combined.

In addition to the above-mentioned components, the viscoelastic body in the present invention includes fillers, M strength agents, softeners, and anti-aging agents.

A vulcanization accelerator, a vulcanizing agent, etc. are appropriately blended.

〔Effect of the invention〕

As explained above, one limitation of the present invention is that Ni2B has a peak of η on the low temperature side, this peak is broad and has little temperature dependence, and has excellent oil resistance.
By using a viscoelastic body made by blending a specific amount of non-thermosetting phenolic resin with good compatibility with R as an intermediate layer between two steel plates, the mechanical elongation of the viscoelastic body is impaired. without changing the peak of η near room temperature (10 to 25
°C).

In addition, the value of η can be maintained at 0.03 or more at O''C to 100''C, and the steel plate and the viscoelastic body are firmly bonded by vulcanization adhesion.

Moreover, the viscoelastic material that makes up the entire intermediate layer does not have any flow phenomenon at high temperatures, and this combined with the fact that the viscoelastic material itself is thermosetting, provides durability that prevents the steel plate from slipping at all even at high temperatures. Becomes excellent in sex.

The damping steel plate of the present invention is also suitable for mechanical processing such as shearing and press working.

〔Example〕

An example of the present invention is shown below.

Vulcanized adhesive was applied to the surfaces of two steel plates (thickness Q, 7 mtn) that were attached to the viscoelastic body, and a viscoelastic body of m shown in Table 1 was interposed between the two steel plates. A tii E'A plate was obtained by vulcanization at 160°C for 30 minutes. The thickness of the viscoelastic body is Q, 5 mm.

Table 1 also shows the physical properties of the viscoelastic body in the @ region.

Further, Table 9-2 shows the results of investigating the damping properties, adhesive properties, oil resistance, etc. of the damping steel plate.

The damping characteristics were measured by the mechanical impedance method. The adhesive properties are determined by bending the ends of the steel plate in opposite directions,
It was measured by so-called T-peeling. Oil resistance is clear from the results in Tables 1 and 2, where a test piece (damping steel plate cut into 50 mm squares) was immersed in lubricating oil at 100°C for 168 hours) and the degree of swelling of the viscoelastic body was examined. In contrast, all of the examples of the examples are simple in vibration damping properties, adhesive properties, oil resistance, and one sensitive property (viscoelastic body), whereas the vibration damping properties of the comparative examples are simple. Not only is it inferior, but it also has quite a few shortcomings in other characteristics.

In addition, when the steel plates of Example and Comparative Example 1 were loaded with a predetermined load in the shear direction and left in an atmosphere of 100°C, the steel plate of Comparative Example 1 fell off in 24 hours. On the other hand, all of the examples were tested after 168 hours.
It was confirmed that there was no abnormality after 1 hour.

Claims (3)

[Claims] (1) A damping steel plate characterized in that a viscoelastic body made of acrylonitrile-butadiene copolymer rubber mixed with a non-thermosetting phenol resin is sandwiched between two steel plates. (2) Non-thermosetting phenolic resin with acrylonitrile
10 to 9 per 100 parts by weight of butadiene copolymer rubber
The vibration-damping steel plate according to claim (1), which contains 0 parts by weight to form a viscoelastic body. (3) The non-thermosetting phenolic resin is a cashew-modified novolac type phenolic resin.
The vibration damping steel plate described in items 1) to (2).