JPH01141143A - Constrained material for vehicle - Google Patents

Abstract

PURPOSE:To perform fixation to a vibration base material of a constrained material and a damping material simply and surely by forming this constrained material with a constituent made up of mixing ethylenic resin and glass fiber in tackifier resin respectively at a specified wt. part rate. CONSTITUTION:A constrained material is laminated on a vibration base material for a vehicle or the like via a damping material. In this case, this constrained material is formed with a constituent made up of mixing at least an ethylenic resin 3-100wt. part and a glass fiber 3-75wt. part in a tackifier resin 200wt. part. This constrained material can be tightly fixed by heating the vibration base material and the damping material at the same time and, what is more, the number of manhour is reducible. In addition, there is not secular change in hardening capacity, and durability is improved, while such problems of fusion failure to the damping material and follow-up failure to the vibration base material are all solvable.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for forming a sandwich-type vibration damping structure on a vibrating base material that easily vibrates, such as a floorboard or an instrument panel of a vehicle. This invention relates to a restraining material that is sandwiched and laminated.

(Prior Art) A heat-fusible vibration damping material containing asphalt as a main component is often fused to the surface of a vibrating base material such as a vehicle floorboard or dash board.

In addition, in recent years, a metal sheet such as steel or aluminum is provided as a restraining material on the top surface of asphalt-based vibration damping material, or a sandwich structure is created by laminating thermosetting resin such as epoxy resin, diallyl phthalate resin, or acrylic resin. Efforts are also being made to improve vibration damping performance. (For example, JP-A-58-63542, JP-A-62
-19445, etc.) (Problems to be Solved by the Invention) However, these allocation structures have the following problems. In other words, in a double-layer damping structure in which the vibration base material is distributed using only a heat-adhesive damping sheet whose main component is asphalt, it is necessary to increase the thickness in order to improve its distribution performance. This increases vehicle weight and costs as well. In addition, in the case of a sandwich-type distribution structure in which steel plates, aluminum plates, etc. are laminated on the top surface of an asphalt-based heat-adhesive vibration damping sheet, the distribution performance as a structure improves; In order to adhere closely to the fusible damping sheet, it is necessary to fix it mechanically to a highly rigid vibration base material such as a steel plate, or by screwing it with bolts or the like. However, since the floorboards of vehicles are generally press-formed into an uneven shape for the purpose of imparting rigidity, it is necessary to form the restraining metal plate into a complementary shape, which requires an extra process. Another problem is that it is not easy to correctly position the device at a predetermined position during installation.

In addition, although the method of placing an uncured thermosetting resin on the damping layer and curing it during the painting process and using it as a restraining layer does not have the above disadvantages, the uncured thermosetting resin itself is stored during storage. There is a problem that it cannot be stored for a long time when the temperature is high because a curing reaction occurs, and furthermore, if the reaction is too fast during curing, it may not be able to follow the uneven shape of floorboards, etc., or it will not adhere well to the distribution layer. There were also problems such as defects such as , resulting in damage to vibration damping characteristics.

(Means for Solving the Problems) The present invention improves these problems, and is a restraining material in which a damping material is sandwiched and laminated on a vibration base material in a vehicle, etc. , 3 to 100 parts by weight of ethylene resin and 3 to 7 parts by weight of glass fiber per 100 parts by weight of tackifier resin.
The gist of the present invention is a restraining material characterized by being formed from a composition containing at least 5 parts by weight.

Here, the restraining material of the present invention has a high elastic modulus, is excellent in durability, is lightweight, and is required for use in this type of vehicle to completely adhere to the uneven vibrating base material by heat treatment during the painting process etc. In addition, preferred properties include a small decrease in elastic modulus even at relatively high temperatures and good workability. The restraining material according to the present invention satisfies these requirements by 10
At least 3 to 100 parts by weight of tackifying resin
This is achieved by forming a composition containing 3 parts by weight of an ethylene resin and 3 to 75 parts by weight of glass fiber.

The tackifying resin used in the present invention includes natural resins such as rosin and dammar, modified rosins such as polymerized rosin and partially hydrogenated rosin, derivatives of rosins and modified rosins such as glycerin ester rosin and pentaerythritol ester rosin, and β-
Polymers such as pinene polymers, modified terpenes such as terpene phenols, cyclopentadiene resins, aromatic stone fats, alkylphenol-acetylene resins, xylene resins, coumaron indene resins, vinyltoluene-α-methylstyrene A resinous tackifier such as a copolymer resin with a softening point of at least 60 to 1
It is at 80°C. These tackifying resins can be used alone or in combination of two or more.

The softening point of these tackifying resins is required to be 60°C to 180°C, more preferably 80°C to 140°C.
It is ℃. If the temperature is less than 60° C., the temperature range in which it functions as a restraining material for the sandwich-type distribution structure of the vehicle is narrow, resulting in the disadvantage that flow occurs even in the actual operating temperature range of the vehicle. Furthermore, the process of attaching vibration damping material to a vehicle is usually at 120°C to 15°C.
This is carried out using a paint baking process at 0°C for about 30 minutes, but if the softening point is less than 60°C, non-uniform flow will occur and a constrained structure with a uniform thickness will not be obtained.

On the other hand, if it is above 180°C, under the conditions of the paint baking process, the fusion with the damping material will be insufficient and it will not follow the unevenness of the steel plate, which will not only make it impossible to obtain good vibration damping properties. The appearance will also be extremely poor.

The ethylene resin blended in the present invention is blended for the purpose of improving the strength and brittleness of the tackifier resin, and includes polyethylene, ethylene-vinyl acetate copolymer (EVA),
Ethylene-ethyl acrylate copolymer (EEA),
It is selected from ethylene-acrylic acid copolymers and copolymers of ethylene and unsaturated carboxylic acids copolymerizable with ethylene, salts thereof, or esters thereof.

Among these, especially the amount of vinyl acetate copolymerized is 3 to 25
% and a melt index of 0.5 to 450 is preferable, and is excellent in terms of heat fusion properties with damping materials, melt viscosity at high temperatures, strength performance as a restraining material, etc.

The amount of the ethylene resin blended is 3 to 10 parts by weight per 100 parts by weight of the tackifying resin, although it depends on the amount of other compounding agents used.
0 parts by weight, preferably 5 to 50 parts by weight. If the amount is less than 3 parts by weight, there will be no improvement in performance as described above, and if it exceeds 100 parts by weight, the elastic modulus of the molded product will decrease and it will no longer function as a restraining material in a sandwich-type vibration damping structure.

The diameter and length of the glass fibers blended in the present invention are not particularly limited, but the length is usually 100 m.
Chopped strand fibers of less than 25 m, preferably less than 25 m, are used. Even if fibers with a length of 100 Tsuru or more are used, not only no improvement in strength is observed, but also many fibers break during mixing, and it may be difficult to obtain a uniform dispersion state. Although the amount used depends on the amount of other ingredients used, the tackifying resin 10
The amount is 3 to 75 parts by weight, preferably 5 to 50 parts by weight relative to 0 parts by weight. If it is less than 3 parts by weight, no significant strength improvement effect can be expected, and if it exceeds 75 parts by weight, the viscosity during molding will increase significantly and processing will become difficult, which is not preferable.

In the composition of the present invention, in addition to the above-mentioned compounding agents, for the purpose of improving moldability and heat-fusibility within the range of reducing the elastic modulus to an extent that does not impair the performance as a restraining material, Plasticizers can be added.

These plasticizers include phthalic acid derivatives such as dimethyl phthalate, dibutyl phthalate, di(2ethylhexyl) phthalate, and other higher alcohol phthalates;
Isophthalic acid derivatives such as dimethyl isophthalate and di(2ethylhexyl)isophthalate; tetrahydrophthalic acid derivatives such as di(2ethylhexyl)tetrahydrophthalate and diisodecyltetrahydrophthalate;
Adipic acid derivatives such as 2-ethylhexyl) adipate, diisodecyl adipate, diisononyl adipate, sebacic acid derivatives such as dibutyl phthalate, di(2-ethylhexyl) sebacate, trimellitate such as tri(2-ethylhexyl) trimellitate, triisodecyl trimellitate, etc. Acid derivatives, monoester derivatives of organic acids such as citric acid, itaconic acid, and oleic acid, and paraffin derivatives;
Epoxy derivatives, polyester polymerization plasticizers, paraffinic process oils, naphthenic process oils, etc.
Mineral oil softeners such as aromatic process oils, castor oil,
Vegetable oil softeners such as cottonseed oil, linseed oil, rapeseed oil, soybean oil, palm oil, and coconut oil are listed, and one of these
A species or a mixture of two or more species can be added.

Furthermore, in the present invention, inorganic fillers such as calcium carbonate, talc, clay, calcium sulfate, barium sulfate,
Flame retardants such as halogen compounds, antimony oxides, zinc borate hydrate, and aluminum hydroxide, heat stabilizers, lubricants, antiblocking agents, colorants, and ultraviolet inhibitors may be added. Further, in order to reduce the weight, fillers such as micro hollow bodies such as white glass balloons, glass balloons, and foamed stones can also be used.

The method of molding the restraining material according to the present invention is not particularly limited, but for example, the above-mentioned tackifying resin and a predetermined compounding agent are heated and mixed with various mixers such as a Banbury mixer, Henschel mixer, ribbon blender, etc., and extrusion molding, It may be formed into a sheet by roll molding, injection molding, press molding, or the like. In addition, special molding methods include melting and mixing in a container that can be heated and mixed, and then flowing and dripping this molten composition from a slit-shaped nozzle, etc. to form a sheet, or using a roll coater or knife coater to form a sheet. It can also be formed into a shape. In order to prevent inconveniences such as cutting of glass fibers and destruction of micro hollow bodies during processing, it is preferable to select a mixing method that does not apply such large shearing forces. Tackifying resins have significantly lower melt viscosity than ordinary resins such as polyethylene, polypropylene, and polyvinyl chloride, or rubbers such as butadiene rubber and isoprene rubber, so they cannot be used under strong shearing forces such as extrusion molding and candor molding. Simple heat melting,
By mixing, the ingredients can be easily dispersed homogeneously,
A sheet can be obtained by directly flowing out of the slit-shaped nozzle.

The thickness of the sheet obtained in this way is not particularly limited, but it is usually 0.5 to
A range of about 3n is sufficient.

Furthermore, the restraining material according to the present invention can be applied as a restraining layer by applying the restraining material according to the present invention to a vibration base material such as a vehicle, which is a layer to be distributed, through a sheet of a heat-sealing type distribution material such as asphalt. By stacking the material sheets and heating them in a subsequent coating process, etc., it is possible to form a strong sandwich-type vibration damping structure that is in close contact with the vibration base material.

(Effects of the Invention) As explained above, the restraint material according to the present invention is placed on a vibrating base material such as a vehicle together with a heat-sealing type distribution material, and in a painting process etc. By heating the vibration material and the restraining material at the same time, they can be tightly fixed, so there is no increase in the number of steps unlike when using a metal plate as the restraining material, and this restraining material is a heat-melting type, Because it does not utilize curing through cross-linking reactions, etc., it can withstand long-term storage without any change in curing performance over time, unlike constraining materials containing thermosetting resins, and can be used as an allocation material in the heat fusion process. There is no problem of poor fusion with the vibration base material or poor tracking of the uneven shape of the vibrating base material, and the resulting sandwich-inch vibration damping structure exhibits excellent damping effects over a wide temperature range. .

The materials with the respective compositions shown in Table 1 were melted and mixed in a stainless steel container heated to 230°C, and the resulting mixture was hot pressed to form a sheet-like restraining material for vibration damping structures with a thickness of 2 mm. Obtained.

Note that the units of numerical values are parts by weight.

The following tests were conducted on each restraining material having the above composition.

(Al Workability test The composition of sample Nal Nm9 shown in Table 1 was evaluated on a five-point scale for ease of melting and stirring in a stainless steel container, degree of dispersion of the mixture, and ease of handling of molded products. The criteria are as follows.

(Melting/stirability) 5 points: Easily melted, low viscosity, very easy to stir 4 points: Either meltability or melt viscosity is normal, but easy to melt/stir 3 points: Both meltability and melt viscosity are normal. Yes, melting/stirring possible 2 points: Either meltability or melt viscosity is poor and melting/stirring is difficult.

1 point: Poor melting, high viscosity, extremely difficult to melt and stir (dispersion/handling) 5 points: Bidispersion is uniform and the strength of the molded product is high 4 points: Either the degree of dispersion or the strength of the molded product is average It is.

3 points: The degree of dispersion and the strength of the molded product are generally 2 points.The strength of the molded product is either poor and may cause functional problems.

Both the one-point bidispersity and the strength of the molded product are poor and there are functional problems.

As a criterion for workability, it is determined that workability is possible if the workability is 3 or more points. The results are shown in Table 2.

Melting/stirring properties 345535221 Dispersion/handling properties 455541352 (b) Asphalt-based vibration damping sheet ("Melsheet", manufactured by Nippon Tokushu Toyo Co., Ltd., 2 m thick) was used as the vibration damping material in the allocation performance test, and the restraining materials and Conventional restraint material 150X3 each
00 (Dragon) steel plate (thickness: 0°, 8 fins) was used to create an allocation structure, and the loss coefficient of each structure was set at 20°C, 40°C,
Measured at 60°C. To bond the damping material and the restraining material, the damping material and the restraining material were laminated on a steel plate, and heat treatment was performed in an oven at 150° C. for 30 minutes to fuse each layer. The loss coefficient was calculated from the half-width from the resonance point of the mechanical impedance, and the loss coefficient of 20011z was determined by interpolation.

Note that the measurement frequency range is 1 to 100011z. The measurement results are shown in Table 3.

The restraining materials used for comparison are as follows.

! 1kLIO: 0.8m thick steel plate-11: Butadiene rubber 1001 diallyl phthalate 1
00, peroxide (t-BPB) 5, calcium carbonate 10
0. Carbon 5 was kneaded and rolled into a sheet with a thickness of 2 fins.

Table 3 1 0.2B 0.330.38 2 0.260.350.37 3 0.250.340.36 4 0.290.370.39 5 0.290.380.39 6"0.110. 150.08 790.180.290.30 8" 0.110,120.08 9"0.210.330.35 10" 0.190,330.35 11" 0.180.250.30 None" 0. 10 0.06 0.04* is a comparative example.

(C) Shape following test on uneven board The above-mentioned asphalt-based distribution material and each restraint material were each
0+n, length 250 m, placed on a steel plate with an uneven corrugated shape shown in Fig. 1 for 1 ru perpendicular to the direction of the waves, and heat-treated in an oven at 150°C for 30 minutes to form an uneven shape. The tracking performance was observed. The results are shown in Table 4. However, the judgment is based on those that are in close contact with each other without any gaps.
○”, and those with gaps remaining were rated “×”.

Table 4 Restraint material depth Judgment Adhesion condition 1 0 Complete adhesion 2 0 〃 3 0 〃 4 0 〃 50 ” 6” O Non-uniform thickness of sloped part 7 “ 0 8” 0 99 × Large corner gap 10° The damping layer and the restraining layer did not come into close contact with each other.* is a comparative example.

As can be seen from the test results in (a), (b), and (C) above, the restraint material of the present invention has excellent workability, sheet practical strength, distribution characteristics, and shape followability to the uneven steel plate surface, and is suitable for use in sandwich-type vehicles. It can be seen that it has an excellent function as a restraining material for vibration damping structures.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the shape and dimensions of the uneven corrugated steel plate used in the shape following test of the restraint material, (a) is a plan view, (b)
) is a side view. Patent Applicants Nippon Zeon Co., Ltd. Honda Motor Co., Ltd. Zeon Kasei Co., Ltd. (a) (b) Figure 1 Procedural Amendment (Bulletin February 3, 1988 Commissioner of the Japan Patent Office/J%Jll Moku ■ Husband) 1, 4q
Cow Pickpocket R Minamisai No. 296091 of 1988 2, Name of the invention: Vehicle restraint material 3, Relationship with Amendator Hanyu Patent W), Address: 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Name
Zeon Co., Ltd. and 2 others 4, agent 5, date of amendment order 6, Showa year, month, day 6, number of inventions increased by amendment 8, content of amendment 3 + content of amendment as per installment (
Patent Application No. 62-296091) 1, Specification page 4, No. 19
From line 5 to line 5 on page 5 of the same page, ``Dammar etc...''
- The description of acetylene resin, J, is corrected as follows. Glycerin ester of rosin, polymerized rosin, partially hydrogenated rosin, disproportionated rosin, rosin derivatives such as pentaerythritol ester, polyterpene resin obtained by cationic polymerization of α-pinene, β-pinene, dipentene, etc., terpene phenol, etc. Terpene resin modified product, dicyclopentadiene resin, aliphatic petroleum resin or its acid modified product, aromatic petroleum resin, aliphatic aromatic polymeric petroleum resin, alkylphenol resin, 2. On page 13 of the specification, "(1) Nippon Zeon, Finton C-20OL, softening temperature 101℃" under Table 1
``(1) Finton C-20OL manufactured by Nippon Zeon (
Softening point: 101℃, acid value: 17■KOH/g aliphatic petroleum resin)'' is corrected.

Claims (1)

[Claims] A restraining material that is laminated by sandwiching a damping material on a vibration base material in a vehicle, etc., which contains 3 to 100 parts by weight of ethylene resin and 3 parts by weight of glass fiber per 100 parts by weight of tackifying resin.
A restraining material for a vehicle, characterized in that it is formed from a composition containing at least 75 parts by weight.