JPH1015959A - Sheet material equipped with impact relaxing properties and stress dispersibiity and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relax and disperse an impact or vibration by covering the surface of a crosslinked gel material containing a filler with an elastomer film and further bonding a film for a core material thereto. SOLUTION: An elastomer film 2 laminated to a base material 3 in a releasable manner is bent to be arranged along the inner surface of a mold 4. Thereafter, a plasticizer is added to liquid rubber to be uniformly mixed therewith by a stirrer. A film 7 for a core material is bonded to be laminated to the elastomer film 2 protruding from a mold 4 and a molded object is taken out of the mold 4 and the base material 3 is peeled to obtain a stress dispersing material 1. The sheet material 1 has a structure such that the elastomer film 2 made of polyurethane rich in expansion and contraction deformation is partially applied to the surface of a crosslinked and lightened gel material 6 containing a plasticizer and at least one kind of a filler composed of a polymeric hollow body or a polymeric foam as a skin reducing stlckiness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material having impact relaxation and stress dispersibility and a method for producing the same. More specifically, the present invention relates to a method of forming a molecular network by subjecting a liquid rubber to a crosslinking reaction with a polyfunctional crosslinking agent. By containing a large amount of plasticizer between the molecules, it is extremely flexible, can follow any stress, and can reduce and disperse impact and vibration. Beds, mats, cushions, saddles The present invention relates to a lightweight sheet material having impact relaxation and stress dispersibility, which can be used as a bedsore prevention mat, a pad for applying to and protecting each part of a human body, a cushion of a chair rug, fruits and the like, and a method of manufacturing the same. .

[0002]

2. Description of the Related Art Conventionally, sponge has been mainly used as a material for relieving local stress. However, recent ultra-soft gels include polyacrylic acid, which is a liquid containing water,
Hydrogels such as polyvinyl alcohol, polyurethane and polyacrylamide are well known. In addition, gels containing non-aqueous liquids are made by absorbing non-aqueous liquids such as oil into highly oil-absorbing polymers such as polynorbornene, polyvinyl chloride, and styrene-butadiene copolymers, and subjecting them to heat treatment. The shape has been obtained.

Further, as a soft organogel material, an OH group, a COOH group, an epoxy group,
A liquid rubber having a functional group selected from amino groups is formed of a compound or an acid anhydride having two or more functional groups selected from isocyanate groups, epoxy groups, and amino groups at both ends in the presence of a catalyst. A stress-dispersible gel material obtained by performing a crosslinking reaction with a crosslinking agent is known.

[0004]

However, the conventional sponge is moderately flexible and economically advantageous.
There were drawbacks of poor follow-up to stress and large permanent deformation. Further, the hydrogel has a disadvantage that the water content changes during use. On the other hand, a gel using a non-aqueous liquid as a plasticizer has good flexibility, but depending on the material of the polymer, it is difficult to adhere the film to the surface, and there is no sense of unity between the gel material and the skin. However, there is a problem that the gel material and the skin are displaced at the time of use, and even a polymer that easily adheres the film to the surface needs a sufficient thickness to reduce the impact or disperse the stress, so the weight increases, There is a problem that it is difficult to carry around for uses such as bed mats and cushions. In addition, there is a problem that in applications where the device is used in contact with the human body, it feels cold in winter.

The present invention has been made to solve such a problem, and is lightweight, rich in heat insulation, capable of following any stress, and can reduce shock and vibration.
It is an object of the present invention to provide a sheet material having a dispersible impact relaxation and stress dispersibility, and a method for manufacturing the same.

[0006]

The feature of the present invention resides in that the surface of a crosslinked gel material containing a nonaqueous liquid and at least one filler consisting of a polymer hollow body or a polymer foam is made of an elastomer. A sheet material covered with a film and further provided with a core material film and having impact relaxation and stress dispersibility.

Further, according to the present invention, after an elastomer film is laid on a mold, an OH group, C
Crosslinking agent having two or more functional groups selected from isocyanate groups, epoxy groups and amino groups per one equivalent of a liquid rubber having functional groups selected from OOH groups, epoxy groups and amino groups 0.5 to 1.0 equivalent, 50 to 1,500 parts by weight of a plasticizer with respect to 100 parts by weight of the liquid rubber, and at least one kind of polymer hollow body or polymer foam in a volume fraction of 10 to 80. The method includes a method of manufacturing a sheet material having impact relaxation and stress dispersibility, which is obtained by casting a stock solution added with a core material and subjecting it to a cross-linking reaction and then attaching a film for a core material.

[0008] The present invention also relates to a method for bending an elastomer film laminated releasably on a base material and bringing the base material along the surface of the mold, and then forming an OH group on at least a terminal or a side chain.
COOH group, epoxy group, isocyanate group, with respect to 1 equivalent of the liquid rubber having a functional group selected from amino group,
0.5 to 1.0 equivalent of a crosslinking agent having two or more functional groups selected from an epoxy group and an amino group including both terminals, and 50 to 1,500 parts by weight of a plasticizer with respect to 100 parts by weight of the liquid rubber. Then, after casting a stock solution containing 10 to 80% by volume of at least one kind of polymer hollow body or polymer foam to cause a cross-linking reaction, the base material is peeled off, and a core material film is attached. Includes wearing.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method for manufacturing a sheet material 1 having the above-described impact relaxation and stress dispersibility, as shown in FIGS. 1 and 2, an elastomer material laminated releasably on a base material 3 such as paper is used. The film 2 is folded and placed along the inner surface of the mold 4. Then, a plasticizer is added to the above liquid rubber, and the mixture is uniformly mixed with a stirrer. Thereafter, a crosslinking agent and a catalyst are added, and the mixture is similarly uniformly mixed. Was prepared. This undiluted solution is cast, heated at 20 to 80 ° C. for 1 to 120 minutes, crosslinked to form a gel material 6, and then aged at room temperature for 1 to 24 hours. After uniformly mixing the liquid rubber, plasticizer, and catalyst, adding a cross-linking agent and mixing uniformly, then adding a polymer hollow body or polymer foam, etc., and uniformly mixing and casting. May be.

[0010] A core material film 7 made of polyurethane, vinyl chloride, nylon, polyester or the like having a thickness of 0.05 mm or more is adhered to the entire back surface, and an elastomer film 2 protruding from the mold 4 is adhered. The molded body is taken out and the base material 3 is peeled off to obtain the stress dispersing material 1.

The elastomer film 2 is a polyurethane film which is rich in expansion and contraction, and prevents the gel material 6 from sticking and disperses an appropriate stress in the stress dispersing material 1. The thickness of the film 2 is 30 to 200 μm,
When the thickness exceeds 200 μm, the film 2 is hardly deformed by stress, so that the stress dispersion of the sheet material 1 is hindered. On the other hand, when the thickness is less than 30 μm, the strength of the film 2 is reduced and the film 2 is easily broken.

As shown in FIG. 3, the obtained sheet material 1 is a gel material 6 containing a plasticizer and at least one filler consisting of a polymer hollow body or a polymer foam, which is reduced in weight by crosslinking.
Elastomer film 2 such as polyurethane film which is rich in elastic deformation as a skin to reduce the adhesiveness on the surface
In order to partially cover and prevent large deformation and improve the overall strength, a film 6 for a core material is adhered to the entire back surface.

The undiluted liquid rubber used in the present invention has OH groups, COOH groups, epoxy groups,
It has a functional group selected from amino groups, and has polybutadiene, polyisoprene, polyether polyol, and polyester polyol in the main chain. Specifically, 1,4
Polybutadiene (R-45HT, R-45 manufactured by Idemitsu Petrochemical Co., Ltd.)
15HT), liquid polyisoprene rubber (Kuraray L
IR-403, 410).

The cross-linking agent is a cross-linking agent having two or more functional groups selected from isocyanate groups, epoxy groups and amino groups, including both terminals. Those having an isocyanate group include 4,4'-diphenylmethane diisocyanate, toluene 2,4'-diisocyanate, hexamethylene didiisocyanate, triphenylmethane triisocyanate, and polyaryl polyisocyanate.

Those having an epoxy group include 1,4 butanediol diglycidyl ether, neopentyl glycol diglycidyl ether, and trimethylolethane triglycidyl ether. Those having an amino group include metaxylenediamine, diethylenetriamine, triethylenetetramine, and diaminophenylmethane. Further, there are acid anhydrides such as 3,3'-4,4'benzophenonetetracarboxylic dianhydride and M-fevirene-bismaleimide.

The amount of the crosslinking agent to be added is 0.5 to 1.0 equivalent relative to 1 equivalent of the liquid rubber. If the amount is less than 0.5 equivalent, the gel is not formed due to insufficient cross-linking, so that the resin flows plastically when a load is applied, and does not return to the original shape even when the load is removed. On the other hand, if it exceeds 1.0 equivalent, the crosslinking is sufficient, but the hardness becomes too high to follow the stress sufficiently, so that a stress-dispersing gel material capable of sufficiently dispersing stress cannot be obtained.

The plasticizer has an SP value of 8.4 to less.
10.2 is a polar plasticizer having good compatibility with the liquid rubber, and contains a large amount between molecules of a molecular network by a cross-linking reaction, making it difficult to migrate to the surface of the gel material. As a specific example, butylbenzyl phthalate (SP value of 10.
2), dibutyl phthalate (SP value: 9.6), ether ester (RS-107; SP value: 9.2, RS-70)
0; SP value 8.9), dioctyl phthalate (SP value 9.0), dioctyl adipate (SP value 8.5), dioctyl sebacate (SP value 8.4), chlorinated paraffin (SP value 9.2 to 9.2) 9.7), diisodecyl phthalate (SP value of about 9.0), ditridecyl phthalate (SP value of about 9.0) and the like.

The amount of the plasticizer is 50 to 1,500 parts by weight based on 100 parts by weight of the liquid rubber. If the addition amount is less than 50 parts by weight, the hardness becomes too high, and even if a load is applied to the gel material, the dispersion of stress becomes worse,
There is a problem of lack of shock absorption. On the other hand, when the added amount is 1,5
If the amount is more than 00 parts by weight, gelling is not formed due to insufficient crosslinking, and the gel does not return to its original state even when the load is removed.

The hollow polymer body is a hollow body made of polyacrylonitrile, vinylidene chloride, a copolymer thereof, or the like. Specifically, these materials are used as partition walls to contain a low boiling point and hydrocarbons. A hollow body or a body obtained by attaching a rubber filler such as calcium carbonate or talc to the surface of the hollow body to improve workability may be used.

The polymer foam is a powder of polyethylene, polypropylene, polyurethane or the like having closed cells. At least one kind of these polymer hollow bodies and polymer foams can be used, and specifically, two or more kinds having different particle diameters can be used.

The particle diameter of the polymer hollow body or the polymer foam is 2 mm or less, preferably 0.5 mm or less. When the particle size exceeds 2 mm, the polymer hollow body or the polymer foam is separated from the liquid rubber, the plasticizer, and the like, and does not become a homogeneous gel material. Further, the flexibility of the stress-dispersing gel material is lost, so that sufficient stress-dispersing ability, vibration and impact relaxation cannot be exhibited. Further, the volume fraction of the added amount of the polymer hollow body or the polymer foam is 10 to 80%. If the volume fraction is less than 10%, a sufficient weight-reducing effect cannot be obtained, while if it exceeds 10%, the elongation of the gel material is reduced and the recovery from deformation is also reduced, so that sufficient vibration and impact are obtained. No ease of relaxation.

As the catalyst, triethylamine,
N, N, N ', N'-tetramethylethyldiamine, tetramethylguanidine, triethylenediamine, dimethylaminoethanol, bis (2-dimethylaminoethyl) ether, tris (dimethylaminomethyl) phenol, dimethylaminomethylphenol, etc. There are amines, or organotin compounds such as stannas octoate, dibutyltin diacetate, dibriltin dilaurate, dibriltin marcabutide, and lead octoate.

The amount of the catalyst added is 0.005 parts by weight of the catalyst per 100 parts by weight of the liquid rubber, particularly when the liquid rubber is subjected to a crosslinking reaction with a crosslinking agent having an isocyanate group.
To 3 parts by weight, and when the liquid rubber is cross-linked by a cross-linking agent having an epoxy group, the liquid rubber 100
The catalyst is used in an amount of 10 to 30 parts by weight based on parts by weight. Outside this range, the gel is not formed due to insufficient cross-linking, and the cross-linking reaction is too fast, resulting in a large variation in gel hardness.

In the present invention, in addition to the above additives, for example, a surfactant, B
HT, Irganox 1010, 1076, BB
Acid inhibitors such as M, BHA, for example, Biosorb 10
0, 130, 120, Cyasorb UV-24
And an antifungal agent such as pentachlorophenol and copper-8-hydroxyquinoline.

A plasticizer and a catalyst are added to the liquid rubber,
Then, after adding a crosslinking agent and mixing uniformly with a stirrer, a polymer hollow body or a polymer foam is further added and mixed uniformly. This was poured into a mold having a predetermined shape, heated at 20 to 80 ° C. for 1 to 120 minutes to crosslink, and then at room temperature for 1 to 24 hours.
Aging time.

[0026]

Next, the present invention will be described in more detail with reference to specific examples. Example A urethane film laminated releasably on paper was cut out by setting dimensions, and this was cut at 395 mm × 395 mm × 25 mm.
Set in a mold with the dimensions of Then, each of the formulations shown in Table 1 was put into a stirrer, and the uniformly mixed undiluted solution was poured into a mold and heated at 70 ° C. for 60 minutes for crosslinking.
Aged at room temperature for 24 hours to obtain a gel material. Subsequently, a double-sided tape was attached to a 0.5 mm thick vinyl chloride core film, which was then attached to the back of a gel material, and the paper was peeled off to produce a sheet material.

The specific gravity, hardness (F-type hardness meter), heat retention and stress dispersibility of the obtained sheet material were measured. The heat retention was determined by placing a hand on the sheet material and taking time until the cold at that time was no longer felt. In the method of measuring the stress dispersibility, the sheet material was pressed down by the thickness, and the local stress propagation distance, which was the linear distance at which distortion occurred, was determined. Table 1 shows these results.
It is described together.

[0028]

[Table 1]

As a result, the sheet material obtained in this embodiment has a small hardness and is very flexible, can follow any stress, and has a small specific gravity and good heat insulation. You can see that.

[0030]

As described above, in the sheet material having impact relaxation and stress dispersibility of the present invention and the method for producing the same, the liquid rubber is subjected to a crosslinking reaction with a polyfunctional crosslinking agent to form a molecular network. Contains a large amount of plasticizer between molecules and contains a polymer hollow body or polymer foam, and is surrounded by an elastomer film and affixed with a core material film. In addition, any stress can be applied, and it has the effect of reducing and dispersing shocks and vibrations.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a step of a method for manufacturing a sheet material according to the present invention and showing a state after a stock solution is poured into a mold.

FIG. 2 is a cross-sectional view showing a process of the method for manufacturing a sheet material according to the present invention, showing a state in which a core material film is stuck on one surface of the back surface.

FIG. 3 is a sectional view of a sheet material according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet material 2 Elastomer film 3 Base material 4 Mold 6 Gel material 7 Core material film

Continuation of the front page (72) Inventor Masayuki Ogino 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsutoshi Belt Co., Ltd. (72) Inventor Masato Kawahara 4-1-1, Hamazoedori, Nagata-ku, Kobe Mitsuhoshi Inside the Belt Co., Ltd. (72) Inventor Toru Noguchi 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Mitsusei Belt Co., Ltd.

Claims (4)

[Claims] 1. A surface of a cross-linked gel material containing at least one kind of filler composed of a non-aqueous liquid and a polymer hollow body or a polymer foam is covered with an elastomer film, and a core material film is attached. A sheet material having impact relaxation and stress dispersibility, characterized in that: 2. The sheet material according to claim 1, wherein the elastomer film is polyurethane. 3. An elastomer film is laid on a mold, and an isocyanate group is added to one equivalent of a liquid rubber having a functional group selected from OH groups, COOH groups, epoxy groups, and amino groups at least at terminal or side chains. 0.5 to 1.0 equivalent of a cross-linking agent having two or more functional groups selected from epoxy groups and amino groups at both ends thereof, and 50 to 1,500 plasticizers per 100 parts by weight of the liquid rubber. And a crosslink reaction by casting a stock solution containing 10 to 80% by volume of at least one kind of polymer hollow body or polymer foam, followed by attaching a film for core material. Of manufacturing a sheet material having shock relaxation and stress dispersibility. 4. An elastomer film, which is releasably laminated on a base material, is bent, and the base material is made to conform to the surface of the mold. Then, at least the terminal or the side chain has an OH group, a COOH group, an epoxy group, an amino group. A crosslinking agent having two or more functional groups selected from isocyanate groups, epoxy groups, and amino groups at both ends, relative to 1 equivalent of the liquid rubber having the functional groups selected from the groups. Equivalent, a stock solution obtained by adding 50 to 1,500 parts by weight of a plasticizer to 100 parts by weight of the liquid rubber, and further adding 10 to 80% by volume of at least one kind of polymer hollow body or polymer foam. A method for producing a sheet material having impact relaxation and stress dispersibility, characterized in that a core material film is adhered and a base material is peeled off after a cross-linking reaction.