JPH0521726B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a seat cushion material with excellent weather resistance, and more specifically, for use in ski resort lift seats, outdoor stadiums, outdoor theaters, park benches, etc. Excellent light and water resistance even when constantly exposed to wind and rain.
The purpose of the present invention is to provide a foamed polyurethane sheet cushion material that has weather resistance such as hydrolysis resistance.

(Prior Art and its Problems) Conventionally, seat cushion materials made of foamed polyurethane resin have been used on the seat surfaces of ski lifts and the like to improve seating comfort.

These foamed polyurethane resin sheet cushion materials contain a polyol component,
It is formed by injecting a foamable polyurethane resin composition containing a polyisocyanate component, a catalyst, a blowing agent, etc., and causing it to react and foam. The surface is covered with a skin layer 22 having a low expansion ratio. Note that 23 is an insert material such as an iron plate. By forming such a skin layer 22, shape retention, surface strength, water resistance, etc. are imparted to the sheet cushion material.

However, when the above-mentioned seat cushion material is used as a seat cushion material for, for example, a lift seat, it is exposed to wind and rain, extreme temperature differences, strong direct sunlight, etc. over a long period of time, and water builds up inside. Because it permeates through the water and there is a significant temperature difference between winter and summer,
Foamed polyurethane resin deteriorates rapidly, and particularly when the foamed polyurethane resin is polyester polyurethane, hydrolysis progresses significantly and there is a problem in that it easily deteriorates.

Furthermore, even if polyether type polyurethane resin has excellent hydrolysis resistance, its light resistance is insufficient.
Similar deterioration is inevitable.

Also, although there is a skin layer on the surface, this skin layer is also foamed to some extent, so absorption and penetration of moisture cannot be avoided, so if you sit in a wet state, your butt will get wet, and in winter, There is a problem in that it gives a significant amount of cold to the buttocks.

Therefore, an object of the present invention is to provide a foamed polyurethane resin seat cushion material that has excellent durability such as weather resistance and hydrolysis resistance, and does not give a wet or cold feeling even when seated. .

(Means for solving problems) The above object is achieved by the present invention as described below.

That is, the present invention provides a weather-resistant seat shoe, characterized in that a watertight resin film layer is formed on the surface of a seat cushion material formed from a foamed polyurethane resin via a closed-cell foamed resin layer. Shion material and method for producing the same.

(Function) According to the present invention, by forming a watertight resin film layer on the surface of a sheet cushion material made of foamed polyurethane resin via a closed-cell foamed resin layer, water seepage into the foamed polyurethane resin is prevented. In addition, even if the watertight resin film layer on the surface is damaged, it is possible to prevent water from seeping into the foamed polyurethane resin, further improving the weather resistance and durability of the foamed polyurethane resin. It has improved hydrolyzability, and even when sitting in winter, it does not feel cold and has an excellent feel.

(Preferred Embodiments) Next, the present invention will be described in more detail by citing preferred embodiments.

The weather-resistant sheet cushion material of the present invention has a watertight resin film layer 3 on the surface of a skin layer 2 of a sheet cushion material 1 made of foamed polyurethane resin via a closed-cell foamed resin layer 4 as shown in the first diagram. It was formed.

In addition, 5 is the shape retention property of the sheet cushion material,
This insert material is made of iron or the like and has a joint portion for fixing it to the seat, but this insert material is not essential to the present invention.

The foamed polyurethane resin itself used in the present invention is well known, and has a molecular weight of 1000 to 10000,
Preferably polyol components such as 3000 to 6000 bifunctional polyester polyols, polyether polyols, polycarbonate polyols, polymer polyol blends, TDI, TDI/MDI,
Polyisocyanate components such as MDI, amine type/
A foamable polyurethane resin consisting of a catalyst such as a tin-based catalyst, a foam stabilizer such as a high-activity silicone or a low-activity silicone, and a foaming agent such as water or Freon-11, and may further contain pigments, flame retardants, etc. as additives. obtained from the composition.

Foam molding of the well-known foamable polyurethane resin compositions as described above is divided into hot cure type, cold cure type, integral skin form type, etc., but in the present invention, cold cure type and/or integral skin form type is used. Skin form type is preferred.

In order to foam-mold a sheet cushion material of a desired shape using the above-described foamable polyurethane resin composition, for example, in the case of a cold cure type, first, raw materials are mixed in a foaming machine according to a predetermined formulation. The mixture is mixed, poured into a mold having the desired inner surface shape, closed, passed through an insulating tunnel for curing, and then opened and demolded to obtain the desired product.

Particularly in the case of the integral skin form type, a temperature-sensitive fluorocarbon foaming agent is used as the blowing agent, and a mold made of a material with high thermal conductivity is used in the process, and an elastomer-like skin is applied to the surface of the molded product. The layers are formed simultaneously with the molding.

All of the above-mentioned foam molding methods themselves are well known, and these well-known materials and molding methods can be used as they are in the present invention.

The main feature of the present invention is that a watertight resin film layer is provided on the surface of the sheet cushion material formed as described above via a closed-cell foamed resin layer 4.

The watertight resin film layer and closed-cell foamed resin layer may be attached to the surface of the sheet cushion material once molded, but it is preferable to form these layers at the same time as molding. .

The watertight resin film layer is a non-foamed resin film layer, and is made of, for example, polyethylene, polypropylene, polyester, polyamide, acrylic,
It is a film layer made of a thermoplastic resin such as a polyurethane resin, and may be transparent or opaque, uncolored or colored, and is not particularly limited.

A particularly preferable resin film layer is a polyurethane resin film layer in consideration of adhesiveness with the sheet cushion material, and in particular polyisocyanates such as hydrogenated MDI, hydrogenated XDI, lysine diisocyanate, lysine ester diisocyanate, hexamethylene diisocyanate, Polyurethane resins using an aliphatic polyisocyanate such as isophorone diisocyanate and polyether polyols or polycarbonate polyols as polyols are preferred because they have excellent discoloration resistance and deterioration resistance.

In addition, in order to impart superior weather resistance to the sheet cushion material, it is preferable that these watertight resin film layers have sufficient water repellency. Silicone-modified polyurethane resins can be preferably used.

This silicone-modified polyurethane resin is one in which silicone having a hydroxyl group or an amino group is included in the chain of a polyurethane resin as at least a part of a polyol. The watertight resin film layer as described above has a thickness of, for example, 1 to 100 μm.

In the present invention, a closed-cell foamed resin layer is formed between the sheet cushion material and the watertight resin film layer. This closed-cell foamed resin layer is, for example, a foamed polyethylene sheet, a foamed polypropylene sheet, a closed-celled polyurethane resin sheet, etc., and commercially available foamed sheets can be used as they are. The preferred thickness is about 0.1 to 5.0 mm.

A method for interposing these closed-cell foam resin layers between the skin layer and the watertight resin film layer is to laminate a closed-cell foam resin sheet and a watertight resin film on the surface of the skin layer sequentially or simultaneously. However, for example, a watertight resin film layer of a desired thickness is formed in advance on one surface of the closed-cell foamed resin sheet by a coating method, and this is cut into a desired shape.
Possible methods include placing the film on the inner surface of a mold prior to molding, or placing a watertight resin film of a desired shape and a closed-cell foam resin sheet on top of each other on the inner surface of the mold in advance. .

In the above method, an appropriate adhesive may be used to improve the adhesion between the skin layer and the closed-cell foam resin layer and between the watertight resin film layer and the closed-cell foam resin layer. Of course.

Preferred methods for forming the watertight resin film layer and the closed-cell foam resin layer on the surface of the sheet cushion material are divided into a coating method and a film method. The coating method is to create a paint by dissolving the resin forming the film layer in an organic solvent, and apply this paint at a solid content of 1 to 100 g/m ² prior to molding by spraying or other methods to release the paint. By applying the foamed polyurethane resin to the surface of the mold, and placing a closed-cell foamed resin layer on the surface of the coating film before or after drying to form a composite sheet, and then performing foam molding of the foamed polyurethane resin. It will be done.

The film method is a method in which a laminated film and a closed-cell foamed resin layer are cut into a desired shape, placed on the inner surface of a mold, and similarly foam-molded.

When using silicone-modified polyurethane resin as the resin in either method,
Since this resin itself has sufficient mold releasability, mold release treatment on the inner surface of the mold can be omitted.

As described above, the weather-resistant sheet cushion material of the present invention having a watertight resin film layer on the surface and a closed-cell foamed resin layer in the middle can be obtained.

In addition, when molding the sheet cushion material, an insert material 5 such as a steel plate can be inserted to give the molded product good shape retention, and a drawing pattern can be formed on the inner surface of the mold. It is also possible to give the molded article a leather-like surface shape.

Further, the sheet cushion material of the present invention includes, for example,
Any seat cushion material may be used for ski lift seats, theater and baseball stadium seats, chairs, sofas, car seats, etc., but is not particularly limited.
In particular, the effects of the present invention are particularly noticeable in ski resort lift seats which are constantly exposed to wind and rain, and seats in places without roofs.

Further, the watertight resin film layer and the closed-cell foamed resin layer formed on the surface of the sheet cushion material may be provided on the entire surface of the sheet cushion material, or may be provided only on the upper surface.

(Effects) According to the present invention as described above, by forming a watertight resin film layer on the surface of a sheet cushion material made of foamed polyurethane resin via a closed-cell foamed resin layer, it is possible to form a watertight resin film layer on the surface of a sheet cushion material made of foamed polyurethane resin. In addition to preventing water seepage, even if the watertight resin film layer on the surface is damaged, it is possible to prevent water from seeping into the foamed polyurethane resin, further improving the weather resistance of the foamed polyurethane resin. It has improved durability and hydrolysis resistance, and also has an excellent feel without feeling cold even when sitting in the winter.

(Example) Next, the present invention will be explained in more detail by giving examples and comparative examples. In the text, parts or percentages are based on weight unless otherwise specified.

Example 1 100 parts of 2-3 functional polyol (OH value 56), F
−80 (polyisocyanate) 51 parts, Freon −113.9
part, silicone foam stabilizer 1.0 part, tertiary amine catalyst 0.1 part
0.25 parts of tinned octylate and 3 parts of black pigment paste are mixed in a foaming machine to form a mold having the inner surface shape of a seat cushion material for ski resort lift seats. Spray a 5 μm thick isophorone diisocyanate-polyether polyol type polyurethane resin paint (solid content 30%) onto the surface of a foamed polyethylene sheet (thickness 0.3 mm) with an expansion ratio of 5 times (corresponding to the top surface) and dry it to apply polyurethane. A composite sheet on which a resin film layer (thickness: 20 μm) has been formed is placed in a mold that has been tightly attached in advance, and the weather-resistant sheet cushion material of the present invention is produced by foam molding, opening, and demolding according to the integral liquid foam method. Obtained.

The foaming ratio inside this cushion material was approximately 30 times, and the skin layer was approximately 1.5 mm thick, and the foaming ratio was approximately 1.5 times.

Example 2 In place of the foamed polyethylene sheet of the composite sheet in Example 1, a foamed polypropylene sheet (thickness 0.3 mm) with a foaming ratio of 5 times was used, and the other conditions were the same as in Example 1, except that the weather-resistant sheet cushion material of the present invention was used. I got it. The foaming ratio inside this cushion material is approximately 30.
The skin layer is approximately 1.5mm thick and the foaming ratio is approximately
It was 1.5 times bigger.

Example 3 A weather-resistant sheet cushion material of the present invention was obtained in the same manner as in Example 1 except that a silicone-modified polyurethane resin paint (solid content 30%) was used in place of the polyurethane resin paint in Example 2. The foaming ratio inside this cushion material was approximately 30 times, and the skin layer was approximately 1.5 mm thick and the foaming ratio was approximately 1.5 times.

Example 4 Instead of the polyurethane resin paint in Example 2, a lysine diisocyanate-polycarbonate polyol type polyurethane resin paint (solid content 30
%), and the other conditions were the same as in Example 1 to obtain a weather-resistant sheet cushion material of the present invention. The foaming ratio inside this cushion material was approximately 30 times, and the skin layer was approximately 1.5 mm thick and the foaming ratio was approximately 1.8 times.

Comparative Example 1 A cushion material of a comparative example was obtained in the same manner as in Example 1 except that the resin film layer and closed-cell foamed resin layer were not formed in Example 1.

Comparative test The sheet cushion materials of the example and the comparative example were each cut into a size of 10 x 10 x 3 mm, the cut surfaces other than the surface were completely waterproofed, and this was sprayed with hot water at 80°C. After being left in the tank for 3 weeks, the resin film tank and foamed polyethylene tank on the surface of the sample of Example were peeled off, and the strength retention rate and depth retention rate were measured, and the following results were obtained.

Table 1 Samples Strength retention (%) Elongation retention (%) Example 1 95 98 Example 2 98 99 Example 3 96 96 Example 4 97 97 Example 4'94 96 Comparative example 1 35 24 Example 4 is an example in which a cut with a length of 5 cm was made with a knife only in the surface resin film layer before the test.

In addition, the sheet cushion materials of Examples 1 to 4 were
When sitting on it after storing it in a freezer at a temperature of 1 hour, the cooling sensation was significantly improved compared to that of Comparative Example 1.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing a cross section of the seat cushion material of the present invention, and FIG. 2 is a diagram schematically showing a cross section of a conventional seat cushion material.

Claims (1)

[Scope of Claims] 1. A weather-resistant sheet characterized by forming a watertight resin film layer on the surface of a sheet cushion material formed from a foamed polyurethane resin via a closed-cell foamed resin layer. Cushion material. 2. The sheet cushion material according to claim 1, wherein the watertight resin film layer is a polyurethane resin film layer formed from aliphatic polyisocyanate as the polyisocyanate. 3. The seat cushion material according to claim 1, which is used for ski lifts. 4. A method of molding a sheet cushion material in a desired shape by reacting and foaming a foamable polyurethane composition containing a polyol component and a polyisocyanate component in a mold, in which a watertight resin film layer and closed cells are formed on the surface of the mold. 1. A method for producing a weather-resistant sheet cushion material, which comprises arranging the polyurethane foam resin layer in the order described above, and then injecting and foaming the foamable polyurethane composition.