JPH0453837A - Fiber-containing rubber sheet - Google Patents

Abstract

PURPOSE:To obtain a fiber-containing rubber sheet which is improved in vibration/sound damping properties and capable of providing a composite material with a higher strength by impregnating at least part, in the thicknesswise direction, of fibers selected from synthetic fibers, natural fibers, metal fibers and inorganic fibers with a specific rubber viscoelastic element. CONSTITUTION:A main agent containing a telechelic polymer which contains reactive groups at both ends of each molecule and being liquid at ordinary temperature; a curing agent containing two or more, per molecule, reactive groups which can react with and can be bound to the reactive groups of the main agent; and optionally a plasticizer, a filler, a flame retarder, a foaming agent or the like are compounded with a rubber viscoelastic element which will not change its shape even when heated to 80 deg.C and has a hardness at 20 deg.C of 0 to 20 (measured with a Type C hardness meter). At least part, in the thicknesswise direction, of fibers selected from synthetic fibers, natural fibers, metal fibers and inorganic fibers is impregnated with the above-obtained viscoelastic element, followed by curing, to obtain a fiber-containing rubber sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fiber-filled rubber sheet that buffers vibrations and shocks. In particular, applications where the shock absorbing sheet itself is required to be strong due to vibrations and shocks, or where it is constantly exposed to strong vibrations and difficult to maintain, such as protection of equipment with sharp edges. materials, housings that require vibration control, ducts, soundproof coating materials for water supply and drainage pipes, vibration isolating materials for precision equipment, damping materials for acoustic-related products, floor impact sound insulation materials for buildings or transmitted sound insulation materials for walls, and Fibers that can be applied to insulation materials for buildings, vibration damping materials for vehicles and ships, vibration damping materials for preventing NN waves, vibration damping materials for preventing static electricity, materials for preventing rockfall, etc., and are used to buffer and protect vibrations and shocks. Regarding rubber sheets.

(Prior Art) In recent years, improvements in living and working environments have been advocated as living standards have improved, and there has been a strong demand for the elimination of noise and vibrations in particular. For example, foams such as styrofoam and urethane foam, cardboard, hollow plastic laminates, and air-containing plastic sheets are known as impact-reducing materials.

Also used are vibration damping materials such as anti-vibration rubber, non-repulsion rubber, and insulators used in audio equipment. Further, glass wool, rock wool, etc. are commonly used as sound insulation materials. However, in recent years, even in areas that were relatively tolerant of noise and vibration, there has been a growing trend toward higher quality equipment, and with the increasing precision of equipment, there is a demand for extreme vibration elimination, and buildings, vehicles, There is a growing demand for ships to feature quieter spaces.

Various research and developments are being carried out in various fields as countermeasures against this problem, but effective means of preventing it are technically difficult and require a large amount of money. At present, we are waiting for a means to effectively suppress this.

(Problems to be Solved by the Invention) However, the above-mentioned foams such as styrofoam and urethane foam, cardboard, hollow plastic laminates, and air-containing plastic sheets are difficult to overcome. It is known that relaxation materials are easily deformed even under small stress and can alleviate the impact, but because they have low restoring force or strength, once they are compressed and deformed, they are difficult to restore, break, or break. Even if the pressure is relatively small, over a long period of time, the wear and tear becomes large, the original thickness cannot be maintained, and the effectiveness is relatively reduced.As a result, the material loses its function, which is a serious problem. It had some drawbacks.

In addition, anti-vibration rubber, non-repulsion rubber, etc. generally require a vulcanization process, making them expensive and difficult to use for general purposes.They also have a high specific gravity, which increases their weight, and they also have a large modulus of elasticity, making them difficult to absorb impact energy. It was. In addition, damping materials such as insulators used in audio equipment, etc. must have sufficient height to contain a large amount of air, and have the disadvantage of being complex and expensive. was. In addition, it is difficult for sound insulating materials such as glass wool and rock wool to maintain their shape when used alone, and it is necessary to use other materials such as plywood, gypsum board, lead plates, etc., and in order to achieve sufficient effect. requires an air layer, which poses problems in terms of cost, man-hours, and space.

Therefore, when conventional viscoelastic materials are used alone, they are expensive and unsuitable as general-purpose impact cushioning sheets.
Because it is a rubber viscoelastic material that must be handled after curing, there are significant manufacturing restrictions, poor workability, and the disadvantages of requiring equipment.

The purpose of the present invention is to solve the above-mentioned drawbacks, and to provide a member that is low in cost, has a high vibration damping and sound insulation effect, has a high composite material strength, has small dimensional changes over time, and can maintain vibration damping and sound insulation effects. It is about providing.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have developed a material that is low cost, has a small thickness, effectively absorbs impact energy, has good restorability, and has high material strength. As a result of extensive research into composite materials that are strong, long-lasting, and workable, we have found that we have developed a rubber viscoelastic material that is highly effective in absorbing impact energy, as well as restoring force, compressive strength, and tear resistance. By integrating a fibrous material with excellent physical properties such as strength,
The present invention was completed based on the knowledge that the rubber viscoelastic material not only has a greater strength effect than the rubber viscoelastic material alone, but also has a synergistic effect that increases the ability to absorb impact energy. .

That is, the present invention provides a material that is low in cost, has high vibration damping and sound insulation effects, has high composite material strength, has small dimensional changes over time, and can maintain vibration damping and sound insulation effects in the thickness direction of a fibrous material. By impregnating part or all of the rubber viscoelastic material, it has both the characteristics of fibrous material and the characteristics of the rubber viscoelastic material, and also has a shock-absorbing effect superior to that of the rubber elastic material alone. and can also be expected to have a sound absorption effect.
A fiber-containing rubber sheet that is easy to handle and has excellent compression and recovery properties. The fiber-containing rubber sheet of the present invention makes maximum use of the tensile strength and tear strength of the fibers and the vibration damping and compression properties of the rubber viscoelastic body within one layer.

Specifically, the fiber-containing rubber sheet of the present invention includes synthetic fibers such as polyester, polyethylene, polypropylene, acrylic, vinylon, rayon, nylon, and polyamide;
Natural fibers such as linen, silk, cotton, palm, etc., metal fibers such as stainless steel, aluminum, lead, iron, etc., and inorganic fibers such as glass wool, glass fiber, carbon, ceramic, etc., or combinations thereof, in the thickness direction. A rubber sheet partially or entirely impregnated with a rubber viscoelastic material, that is, a rubber sheet in which the rubber viscoelastic material is embedded in a network structure of fibrous materials.
The rubber viscoelastic body retains its shape even when heated to 80°C,
The hardness exhibits a hardness of 0 to 20 on a C-type hardness meter (Japan Rubber Association Standard S RI S-0101) at 20°C.

The rubber viscoelastic material is impregnated into a part or the entire thickness of one of the above fibrous materials or a combination thereof, and then foamed and cured, and the foaming ratio is 1.1 to 10 times. be.

Such a rubber viscoelastic material is mainly composed of a telechelic polymer having reactive groups at both ends of the molecule, and contains a base material that is liquid at room temperature and a reactive group that can react and bond with the telechelic polymer of the base material per molecule. The main component is a curing agent having two or more of them, and is cured in a temperature range of 5 to 80°C, and has flame retardant properties and a specific gravity of 2.3 or more.

The fiber-filled rubber sheet of the present invention is a composite member obtained by impregnating one or both of the above fibrous materials with a rubber viscoelastic material into a part or the entire thickness of the fibrous material. polyester, polyethylene, vinyl chloride,
Film-like products such as ethylene-vinyl acetate copolymer (EVA), foamed sheet-like products thereof, and chloroprene rubber (CR).

Ethylene-propylene terpolymer (EPT).

One type or combination of reinforcing members made of sheet materials such as butyl rubber (IIR) and nitrile rubber (NR), or foamed sheet materials thereof, or film materials such as nonwoven fabric, split cloth, glass cloth, cheesecloth, and paper. Formed by laminating.

The fiber-filled rubber sheet of the present invention has an excellent shock-absorbing effect because the rubber viscoelastic substance enters the network structure of the fibrous material, so the contact area with the rubber viscoelastic substance is dramatically increased compared to a flat surface. However, this leads to an increase in the damping effect due to shear deformation, and the ability to absorb impact energy increases. In terms of compression properties, it is thought that the penetration of the rubber viscoelastic body into the network structure of the fibrous material reinforces the strength of the rubber viscoelastic body itself, increasing the restoring force. In addition, in terms of cost, since the rubber viscoelastic material is reinforced with fibers, handling work is extremely easy when processing the sheet of the present invention, and processing time and
In addition to being very effective in shortening working time, the sheet of the present invention can be processed into long sheets, which is advantageous in terms of cost. In addition, in the construction work of the present invention, impact resistance,
Functions such as vibration damping and heat insulating properties are imparted, and the capacity of the rubber viscoelastic body itself can be reduced by using the fibrous material, thus leading to cost reduction.

Furthermore, by blending a flame retardant into the rubber viscoelastic body, it is possible to add a flame retardant function to the fiber-filled rubber sheet of the present invention, or by blending a foaming agent into the rubber viscoelastic body, It can be made into a foamed rubber viscoelastic body, and high functionality can be easily added.

As shown in FIGS. 1 and 2, the cross-sectional structure of the fiber-filled rubber sheet of the present invention includes synthetic fibers such as polyester, polyethylene, polypropylene, acrylic, vinylon, rayon, nylon, polyamide, hemp, silk, cotton, etc. One type of fibrous material or a combination of fibrous materials, such as natural fibers such as palm, metal fibers such as stainless steel, aluminum, lead, and iron, and inorganic fibers such as glass wool, glass fiber, carbon, and ceramics, in the thickness direction. part or the whole,
There are two types of rubber viscoelastic materials that are impregnated with a rubber viscoelastic material and bonded directly to a protective surface or a vibration surface, and this adhered surface is used as a restraining material. Film-like materials such as vinyl and EVA, or foamed sheet-like materials thereof, CR, EPT, IIR
sheet-like materials such as or foamed sheet-like materials thereof, film-like materials such as non-woven fabric, split cloth, glass cloth, cheesecloth, paper, etc., metal film-like materials and plates such as iron, aluminum, lead, copper, stainless steel, etc. wooden restraining materials such as plywood, veneer, cork, particle board, homoloment board, flexible board, plaster board, calcium silicate board, FRP,
There are products that are used by laminating inorganic restraining materials such as ceramic boards and bonding them to the protective surface or vibration surface.
In order to improve vibration damping characteristics, it is desirable to provide constraining layers on both the upper and lower surfaces as shown in FIG. If a very soft contact surface is required, a flocked base material, a rubber sheet, or the like may be used as the restraining material, or it may be attached to the restraining material surface.

That is, FIG. 1 shows a cross section of an example of a fiber-filled rubber sheet of the present invention in which the entire fibrous material 2 is impregnated with the rubber viscoelastic material 1 and is attached to the impact surface 4, and a portion of the fibrous material 2 is shown in FIG. is impregnated with rubber viscoelastic material l and attached to the impact surface 4.
The fibrous material 2 shown in FIG. thing 20
A part of the rubber viscoelastic body 1 is impregnated, and a restraining material layer 3 (perforated iron plate) 5 is laminated on both sides of the rubber viscoelastic body 1, which is attached to the impact surface 4, as shown in FIG.

There are four types of rubber viscoelastic bodies: hot melt type, water-based or solvent-based dispersion type, type obtained by curing a reactive liquid, and type obtained by obtaining an elastomer by dispersing oil-swellable polymer powder in a plasticizer. However, any type can be applied to achieve the present invention. Each of them has its own unique characteristics, but in particular, crosslinked viscoelastic bodies obtained by curing reactive liquid substances can respond to temperature changes over a wide temperature range.
In particular, viscoelastic bodies obtained using polymers that are reactive at room temperature not only require no energy for heating or drying during the manufacturing process, but also do not require equipment for recovering solvents during the drying process. It is excellent in that there is no corrosion of manufacturing equipment due to moisture, etc.

Among crosslinked viscoelastic bodies, substances that meet the following conditions are particularly desirable as viscoelastic bodies to be applied to the present invention. That is, the rubber viscoelastic material referred to in the present invention is liquid at room temperature, and the cured material after reacting at room temperature is 80°C.
It maintains its shape even when heated to
1) satisfies the condition of 50 or less. Examples of reactive substances that can satisfy the above conditions include combinations of a liquid rubber having a functional group and a crosslinking agent as shown in Table 1.

Table 1 Functional group OH of liquid rubber Functional group of crosslinking agent NGO υ Gold N oxide, -011, -NGO R2 Metal oxide, -NGO peroxide polyvalent halogen compound (-Br) NGO 0)1. -NH,, -NHR-COOR-5Rr NRz, -NHR, -Nl(z, all 8M compound C-0R OtoriNH2 In particular, polyols with a hydroxyl group at the end and a main chain such as polybutadiene, hydrogenated polybutadiene, polybutadiene-nitrile, polybutadiene-styrene, isoprene, etc., polyether polyols, polyester polyols, urethane acrylic polyols, aniline derivative polyols, etc. It is desirable to use these alone or in combination, and in order to impart flame retardancy, it is desirable to add hydroxyl group-terminated liquid chloroprene rubber or to use it alone.Also, as a curing agent for the above-mentioned reactive substance As such, isocyanate-based curing agents are suitable, and it is necessary that two or more incyanate groups exist per molecule.

Specific examples thereof include toluylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and prepolymers having isocyanate groups at both ends, which can be used alone or in combination. Also, isocyanate curing agents can be used in combination with plasticizers due to problems such as blending ratio and viscosity, but the plasticizers must be dehydrated and must not react with isocyanate groups. be. Although it is possible to obtain a rubber viscoelastic body that satisfies the present invention by combining only the essential components for the room-temperature reaction described above, various additives may be added in order to improve cost, workability, and physical properties. Above all,
A wide range of stable rubber viscoelastic bodies can be obtained.

Additives that can satisfy the rubber viscoelastic body of the present invention include, for example, plasticizers, fillers, bituminous substances, tackifying resins, anti-aging agents,
Contains anti-mold agents, flame retardants, catalysts, surfactants, coupling agents, foaming agents such as water, anti-foaming agents, etc., and the blending amounts are 50-300 phr of plasticizer and 10-500 phr of filler.
hr, '1m greens 20-300 phr, and tackifying resin 0-100 phr are preferred.

The plasticizer is blended for the purpose of adjusting the viscosity, adjusting the workability, adjusting the physical properties of the rubber viscoelastic body, imparting flame retardance, etc., and obtains the desired physical properties by adding it in an amount of 50 to 300 phr. Above 300 phr, the shape retention is reduced due to plasticizer bleed, that is, the restoring force is poor;
If the amount is less than phr, the above purpose cannot be achieved.

Examples of plasticizers include naphthenic oil, paraffinic oil, aromatic oil, castor oil, cottonseed oil,
Examples include pine oil, tall oil, phthalic acid derivatives, maleic acid derivatives, and liquid rubbers without functional groups, which can be used alone or in combination. In addition, if flame retardancy is required, halogen compound-based or phosphorus compound-based plasticizers may be used alone or
Alternatively, flame retardancy can be imparted by using them in combination.

Examples of bituminous substances include straight asphalt, proniasphald, tar, etc. In order to obtain the desired rubber viscoelastic body, it is desirable to add 20 to 300 phr of the bituminous material. It can also be modified and used.

Examples of tackifying resins include natural resins, rosins, modified rosins, derivatives of rosins and modified rosins, polyterpene resins, modified terpenes, aliphatic hydrocarbon resins, cyclopentadiene resins, aromatic petroleum resins, and phenolic resins. , alkylphenol-acetylene resin, xylene resin, coumaron-indene resin, vinyltoluene-α-methylstyrene copolymer, etc. alone in an amount of 0 to 100 phr,
Alternatively, by adding them in combination, the adhesion to the fibers can be increased.

The filler can be added in an amount of about 500 phr, but from the viewpoint of workability and physical properties, it is preferable to add the filler in an amount of 10 to 100 phr.Addition of the filler is effective in improving vibration damping properties, sound insulation properties, and flame retardancy. It is used for the purpose of adjusting the blending ratio of main ingredient/curing agent, adjusting viscosity, and reducing blending costs, and preferably those commonly used in rubber and coatings, such as mica, graphite, vermiculite, and talc. ,
Scale-like inorganic powder such as clay, general-purpose fillers such as calcium carbonate, finely divided silica, carbon, magnesium carbonate, aluminum hydroxide, and asbestos can be used alone or in combination.

In addition, by adding ferrite powder, metal powder, and barium sulfate to the filler at 200 phr or more, the specific gravity can be reduced to 2.3.
The above can be used, and a high specific gravity sheet can be obtained. The higher the specific gravity, that is, the higher the areal density, the more difficult it is to transmit vibrations, but considering the workability of viscosity and blending ratio, and the physical properties of the cured product, it is 300 to 500 p.
It is desirable to add hr.

On the other hand, the main components of the rubber viscoelastic body of the present invention are replaced with hydroxyl group-terminated liquid chloroprene rubber, 50 to 200 phr of chlorinated paraffin, which is a flame retardant plasticizer, and 50 to 200 phr, aluminum hydroxide, which is a flame retardant. By substitution, a flame-retardant rubber viscoelastic body can be obtained, and 5 to 10 p of antimony oxide, zinc borate, etc.
By adding hr, higher flame retardance can be achieved. Further, the flame retardant effect increases as the amount of each compounded increases, but the above-mentioned amounts are desirable in consideration of cost and workability.

In addition, a foamed rubber viscoelastic body can be obtained by adding 1 to 5 phr of water or lower alcohol.
If too large a quantity is added, the foaming ratio will be as high as 10 times or more, causing problems with recovery and shape retention, making it inappropriate. If too small a quantity is added, the foaming ratio will be less than 10%, which will reduce the cost of foaming and reduce vibration damping properties. It is undesirable because it cannot be effective.

As mentioned above, the rubber viscoelastic body has been described, but the hardness of the viscoelastic body is affected by compressive stress and impact! The materials mentioned above must be selected depending on the purpose and use, as they have a significant influence on the buffering force and restorability.

The fibrous materials used in the present invention include synthetic fibers and strings such as polyester, polyethylene, polypropylene, acrylic, vinylon, rayon, nylon, and polyamide, natural fibers such as cotton and palm, metal fibers such as stainless steel, aluminum, and iron. Refers to one type of fibrous material or a combination of inorganic fibers such as glass wool, glass fiber, carbon, and ceramic, even if the fibrous material itself is hollow or coated with a resin such as SBR. good. Also, the thickness depends on the desired thickness of the buffer sheet.
You can choose arbitrarily, but considering the cost, 14
A thickness of m to 4 cm is desirable. Further, a film laminate of polyester, EVA, or polyethylene, a foam thereof, or a urethane foam may be laminated on one side of this fibrous material.

A film-like material laminated on one or both sides of a buffer sheet in which part or all of the thickness of the fibrous material is impregnated with a rubber viscoelastic material also acts as a restraining material. , film-like materials such as polyethylene, vinyl chloride, EVA, or foamed sheet-like materials thereof, CR, EPT.

Use sheet-like materials such as IIR, foamed sheet-like materials thereof, film-like materials such as non-woven fabric, split cloth, glass cloth, cheesecloth, paper, etc., and metal film-like materials such as iron, copper, aluminum, lead, stainless steel, etc. As shown in FIG. 4, it can be used regardless of whether or not it has a decorative finish, shape, or hole, but it is preferable to use a material with as high a Young's modulus as possible.

(Examples and Comparative Examples) The present invention will be explained in detail using Examples and Comparative Examples, and evaluated using the evaluation method described below. The results are shown in Table 2.

A rubber viscoelastic body prepared by mixing a main ingredient consisting of hydroxyl group-terminated liquid polybutadiene, asphalt, and a plasticizer with a curing agent having two or more isocyanate groups per molecule is used as a whole nonwoven fabric, which is an example of a fibrous material. A rubber sheet containing fibers is obtained by impregnating the fiber into a rubber sheet and subjecting it to a curing reaction. The sheet exhibits good compression properties and recovery properties. It also shows sufficient performance even when applied to wooden finished floors.

Urajoban I A rubber viscoelastic material prepared by mixing a main ingredient consisting of hydroxyl-terminated liquid polybutadiene, asphalt, and a plasticizer, and a curing agent having two or more isocyanate groups per molecule, is used as a nonwoven fabric, which is an example of a fibrous material. A part of the thickness is impregnated and a curing reaction is performed to obtain a fiber-filled rubber sheet. The sheet exhibits good compression properties and recovery properties. It shows sufficient performance even when applied to wooden finished floors.

An example of a fibrous material is a rubber viscoelastic material that is a mixture of a main component consisting of a single main hydroxyl group-terminated liquid polybutadiene, asphalt, and a flame-retardant plasticizer, and a curing agent having two or more isocyanate groups per molecule. The entire nonwoven fabric is impregnated and a curing reaction is performed to obtain a fiber-filled rubber sheet. The sheet also exhibits good compression properties and recovery properties, and at the same time has good flame retardancy.

It also shows sufficient performance even when applied to wooden finished floors.

A rubber viscoelastic body is prepared by mixing a rubber viscoelastic body with a base component consisting of hydroxyl group-terminated liquid polybutadiene, asphalt, a plasticizer, and metal sludge as a high-density filler, and a curing agent having two or more isocyanate groups per molecule. A rubber sheet containing fibers is obtained by impregnating the entire nonwoven fabric, which is an example of a nonwoven fabric, and curing it. It shows good compression properties and recovery properties, and can improve both light impact sound level and heavy floor impact sound level, especially when applied to wood-finished floors.

A fibrous material is made of a rubber viscoelastic material that is a mixture of hydroxyl group-terminated liquid polybutadiene, asphalt, a plasticizer, a water-based base ingredient as a plasticizer, and a curing agent having two or more isocyanate groups per molecule. For example, a nonwoven fabric is completely impregnated and foamed and cured to obtain a fiber-filled rubber sheet. The sheet exhibits good compression properties, and although it is slightly inferior to non-foamed rubber viscoelastic materials in terms of resilience and 80''C shape retention, it can be applied to wood-finished floors.

Back cover IL A viscoelastic material containing urethane as a basic component is impregnated into the entire nonwoven fabric and cured to obtain a fiber-filled rubber sheet. The sheet exhibits good compression properties and can be used satisfactorily even at high temperatures. It also shows sufficient performance even when applied to wooden finished floors.

In this example, the viscoelastic body is a crosslinked viscoelastic body made of an emulsion-based viscoelastic body, and a fiber-filled rubber sheet similar to that of Example 1 is obtained. The sheet exhibits good compression properties. It also shows sufficient performance even when applied to wooden finished floors.

A rubber viscoelastic material whose basic polymer is a styrene-isoprene-styrene copolymer is impregnated into the entire nonwoven fabric, but crosslinking is not performed. In this case, although the shape retention at 8° C. is slightly inferior, it can be used satisfactorily if it is not used in a heated state, and also exhibits sufficient compression characteristics.

Northern Comparison ① As a comparative example above, there is no rubber viscoelastic material, and a case in which a nonwoven fabric alone is used is shown. In such a case, the compression characteristics become low and the restorability is significantly inferior, making it impossible to achieve the object of the present invention, which is not preferable.

Kitamoto 1 - This is the case of a single rubber viscoelastic body, and although it has good compression properties and restorability, it does not have sufficient effects when applied to a wood-finished floor, and the purpose of the present invention cannot be achieved. ,
Undesirable.

The hardness of the rubber viscoelastic body used in the present invention at a temperature of 20°C was determined by a C-type hardness tester (Japan Rubber Association standard SRT S-01).
A non-woven fabric is prepared by mixing a main ingredient consisting of hydroxyl-terminated liquid polybutadiene, short-chain diol, asphalt, and a filler, adjusted to have a concentration of 40 in step 01), and a curing agent having two or more isocyanate groups per molecule. This shows a case obtained by impregnating the entire surface of the wood and hardening it, and it has good compression properties and recovery properties, but when applied to a wooden finished floor, it does not have the expected effect, and the purpose of the present invention is not achieved. It is unattainable and undesirable.

*1 Hydroxyl group-terminated liquid polybutadiene manufactured by Idemitsu Petrochemical ■Product name Poly Bd R-45HT*2 Polyether polyol manufactured by Daiichi Kogyo Seiyaku ■Product name Polyhardener D-350 *3 Acrylic emulsion manufactured by Chuo Rika Kogyo ■Product name Ricabond P S -8000A*4 Rubber/asphalt emulsion Made by Japan Latex Processing ■Product name: Hullcoat*5 Styrene-isoprene-styrene copolymer Shell Chemical ■Product name: Finton 1107 *6 Recycled butyl rubber Early use rubber ■Product name: Low Mooney Recycled butyl* 7 Short-chain diol Product name Airinol C-100 *8 Plasticizer A Made by Idemitsu Petrochemical ■ Product name Diana Process Oil AH-16 *9 Plasticizer B Made by Tokyo Jushi Kogyo ■ Product name U-Rex 180EF *10 Plasticizer C Made by Ajinomoto ■ Product name Empara 45 *11 Tackifying resin a Made by cheap crude oil ■ Product name YS-Resin A-800 *12 Tackifying resin manufactured by Suurayo Kagaku ■ Product name Alcon P-100 *13 Catalyst Nippon Kagaku Sangyo ■ Product name: Tin octylate *14 *15 Isocyanate prepolymer Daiichi Kogyo Seiyaku ■ Product name: Polyflex MH Aziridine compound diphenylmethane-bis-4,4'-N,N'-diethylene urea evaluation method Section 8"1 Example The main ingredient of the rubber viscoelastic body is adjusted according to the formulation shown in the Comparative Example, and a predetermined curing agent is mixed therewith and then impregnated into a nonwoven fabric and cured. Alternatively, the main ingredient is impregnated into a nonwoven fabric and dried and solidified. Get a rubber sheet.

A sample with L hard skin definition of 1251 m thick x 12 osm width x 100 sm length was prepared and used as a sample for hardness measurement. 7 days at room temperature, 50℃
After 7 days of curing in the atmosphere, the JIS-63
The hardness was measured at 20° C. according to 01.

Create a sample adjusted to the size of shadow 80"C knees 1 method 30-height x 50φ,
Apply a release paper to the elastic surface and apply a load of 500g to the
After being left at rest under conditions of 24 hours at ℃, the load was unloaded and left at room temperature, and the degree of deformation after 4 hours was visually determined. Those with sharp edges and little deformation are marked O, and those with sharp edges and large deformations are marked X.

As shown in FIG. 5, a part of the fibrous material 2 is impregnated with rubber viscoelastic weight for the 150 mm RC slab 7 of 5.5 mm.
The decorative board 6 is laminated and attached to the impact surface 7.
The weight impact sound was measured using the tapping machine 10 and the weight impact sound using the panda machine 11. The measurement method was as shown in FIG. 6 in accordance with J I 5-A-1418. 12 is a microphone, 13 is a precision sound level meter,
14 is a frequency analyzer, and 15 is a level coder. The results were shown in terms of floor impact sound insulation grade according to JI 5-A-1419.

- A sample of Mie property 5011 II width x 50 m + length was compressed by 50% at a compression speed of 2 mm/min using a compression tester with release paper placed on the top and bottom, held for 30 minutes, then unloaded for 10 minutes. I checked the restorability afterward. Those that showed a restorability of 95% or more were marked with a circle, those that showed a restorability of 90% or more were marked with a Δ, and those that showed a restorability of 90% or less were marked with an X.

The relationship between compressive stress and displacement of a rubber sheet sample containing fibers was compressed using a compression tester at a compression rate of 2 Ill/min, and the displacement and compressive stress were read from the obtained chart and shown in Figure 7. Ta.

A sample of rubber sheet with fibers, GIII1 width x 10cm
The sample was cut into + lengths, and the oxygen index was measured according to JIS-7201.

JIS-K
The specific gravity was measured according to the underwater suspension method according to -6350-6-1.

I in FIG. 7 shows the difference in compression properties depending on the presence or absence of a rubber viscoelastic body and the presence or absence of a fibrous material in the present invention.

Compression properties of fiber-filled rubber sheets, rubber sheet elastic body alone,
Comparing the compression characteristics with nonwoven fabric alone, it is found that up to a certain range of displacement, only a small compressive load is required, which is almost the same as that of nonwoven fabric alone, but in the case of large displacement, a large compressive load is required. I understand that. In other words, it shows that it is easy to displace under a small compressive load, and difficult to displace under a large compressive load, which is the ideal compression characteristic for an impact cushioning sheet.

(Effects of the Invention) As explained above, the fiber-containing rubber sheet of the present invention utilizes the compression properties of the rubber viscoelastic body and the compression properties of the fibrous material, and uses the compression properties of the fibrous material in the thickness direction. By impregnating a part or all of the fibrous material, that is, the rubber viscoelastic material enters into the network structure of the fibrous material, the contact area between the fiber and the rubber viscoelastic material is increased, and the impact caused by shear deformation is increased. ! It can efficiently exert the relaxation and damping effect, and it can improve the workability of rubber viscoelastic bodies.
It also saves on the rubber band elastic body itself, reducing costs.
It has the effect of widening the range of applications, such as making it easy to add added values such as making the rubber viscoelastic body flame retardant and increasing specific gravity.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a preferred example of a fiber-filled rubber sheet of the present invention in which the entire fibrous material is impregnated with a rubber viscoelastic material and is affixed to an impact surface. FIG. 2 is a portion of the fibrous material. is impregnated with rubber viscoelastic material,
FIG. 3 is a cross-sectional view of a preferred example of the fiber-containing rubber sheet of the present invention attached to the impact surface, in which a portion of the fibrous material is impregnated with a rubber viscoelastic material,
FIG. 4 is a cross-sectional view of a preferred example of the fiber-filled rubber sheet of the present invention in which a restraining material layer is laminated and applied to an impact surface, and a portion of the fibrous material is impregnated with a rubber viscoelastic material, and both sides of the fiber-filled rubber sheet are shown in FIG. FIG. 5 is a cross-sectional view of a preferred example of the fiber-filled rubber sheet of the present invention, in which a restraining material layer is laminated on the impact surface and the rubber sheet is affixed to the impact surface. FIG. 6 is a cross-sectional view of an example of a test specimen made of laminated decorative plywood and attached to the impact surface, which was used for floor impact sound measurement according to the present invention. FIG. 7 is a diagram showing the compression characteristics of the fiber-filled rubber sheet according to the present invention. 1... Rubber viscoelastic body 2... Fibrous material 3...
Restraint layer (polyester film) 4... Impact surface 5... Restraint layer (perforated iron plate) 6...5.5m Decorative plywood 7...150 s+
a Floor slab 8...Sound receiving room 9...Sound source room 10...Tapping machine 11...Bang machine 12...Microphone 13...Precision sound level meter 1
4...Frequency analyzer 15...Level recorder 16...Specimen Fig. 1 Fig. 7 1.0 1, *(mm)

Claims (1)

[Claims] 1. A type of synthetic fiber, natural fiber, metal fiber, or inorganic fiber;
Or for a combination product, in a fiber-containing rubber sheet whose thickness is partially or entirely impregnated with a rubber viscoelastic material, the rubber viscoelastic material retains its shape even when heated to 80°C. A fiber-containing rubber sheet having a hardness of 0 to 20 on a C-type hardness tester at 20°C. 2. The fiber-filled rubber sheet according to claim 1, wherein the rubber viscoelastic body is foam-cured and has a foaming ratio of 1.1 to 10 times. 3. The rubber viscoelastic body is mainly composed of a telechelic polymer having reactive groups at both ends of the molecule, and has a main component that is liquid at room temperature and a reactive group that can react with and bond with the reactive group of the telechelic polymer as the main component. The fiber-containing rubber sheet according to claim 1, characterized in that the fiber-containing rubber sheet contains as a main component a curing agent having two or more of the following per molecule, and is cured at a temperature range of 5°C to 80°C. 4. The fiber-filled rubber sheet according to claim 1, wherein the rubber viscoelastic body is flame retardant. 5. The fiber-filled rubber sheet according to claim 1, wherein the rubber viscoelastic body has a specific gravity of 2.3 or more. 6. On one or both sides of the fiber-filled rubber sheet,
Polyester, polyethylene, vinyl chloride, ethylene-
Film-like products such as vinyl acetate copolymers or foamed sheet-like products thereof, sheet-like products such as chloroprene rubber, ethylene-propylene terpolymer, butyl rubber, nitrile rubber, or foamed sheet-like products thereof, or non-woven fabrics, split cloth,
Film materials such as glass cloth, cheesecloth, and paper, iron,
The fiber-filled rubber sheet according to claim 1, characterized in that it is formed by laminating a metal film-like material such as aluminum, lead, copper, stainless steel, etc. as a restraining material.