JPH0269230A - Weather resistant seat cushioning material and production thereof - Google Patents

Abstract

PURPOSE:To obtain the title seat cushioning material which is excellent in resistance to weather and resistance to hydrolysis and does not impart wet and cold feeling to a user even in the case of sitting thereon by forming a watertight resin film layer on the surface of the seat cushioning material molded of polyurethane foam resin. CONSTITUTION:Weather resistant seat cushioning material is produced by forming a watertight resin film layer 3 on the surface of the skin layer 2 made of the seat cushioning material 1 molded of polyurethane foam resin. Further a unicellular foam layer 4 is preferably interposed between the skin layer 2 and the watertight resin film layer 3. As the watertight resin film layer, a polyurethane resin film layer formed of aliphatic polyisocyanate as polyisocyanate is preferable. When the seat cushioning material having a required shape is molded by allowing expandable polyurethane composition to react and foam in a mold, it is preferable that the watertight resin film layer or both this resin film layer and the unicellular foam resin layer are arranged on the surface of the mold and thereafter the expandable polyurethane composition is injected and foamed.

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, the present invention relates to a seat cushion material with excellent weather resistance. To provide a notebook cushion material made of polyurethane foam that has excellent weather resistance such as light resistance, water resistance, and hydrolysis resistance even when exposed to wind and rain.

(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 in order to improve seating comfort.

These foamed polyurethane resin sheet cushion materials are formed by injecting a foamed polyurethane resin containing a polyol component, a polyisocyanate component, a catalyst, a foaming agent, etc. into a mold having a predetermined shape, and causing the resin to react and foam. As shown in the second figure, the interior 21 has a foaming ratio of about 20 to 30 times, and its surface is covered with a skin layer 22 having a low foaming 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 seat cushion material.

However, when the above-mentioned seat cushion material is used as a seat cushion material for, for example, a lift seat,
Over a long period of time, it is exposed to wind and rain, extreme temperature differences, strong direct sunlight, etc., and water seeps into the interior, and the temperature difference between winter and summer is significant, so polyurethane foam resin deteriorates rapidly. In particular, when the foamed polyurethane resin is a polyester polyurethane, there is a problem that hydrolysis progresses significantly and the resin easily deteriorates. Further, even if a polyether type polyurethane resin has excellent hydrolysis resistance, the light resistance is insufficient, and similar deterioration is inevitable.

In addition, even though there is a skin layer on the surface, this skin layer is also foamed to some extent, so it is inevitable that moisture will absorb and permeate, 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 seat cushion material made of foamed polyurethane resin that has excellent durability such as weather resistance and hydrolysis resistance, and does not make the user feel wet or cold even when seated.

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

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

(Function) Even when a seat cushion material made of foamed polyurethane resin is formed as an integral skin foam, the skin layer is partially foamed, so
When used as a seat cushion material for ski lifts, moisture seeps into the interior, and this moisture, severe temperature differences between day and night, direct sunlight, and other harsh environmental conditions cause the foamed polyurethane resin to deteriorate significantly and deteriorate in a relatively short period of time. According to the present invention, by forming a watertight resin film layer on the surface of the seat cushion material, water seepage is prevented, and the above-mentioned problem of deterioration is easily solved.

In a further preferred embodiment, a closed-cell foamed resin layer is interposed between the foamed polyurethane resin and the watertight resin film layer on the surface, so that even if the watertight resin film layer on the surface is damaged, Since water permeation can be prevented, weather resistance and hydrolysis resistance are further improved, and when sitting in the winter, the seat does not feel uncomfortable and does not cool the buttocks.

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

The weather-resistant seat cushion material of the present invention is one in which a watertight resin film layer 3 is formed on the surface of the skin layer 2 of a seat cushion material 1 made of foamed polyurethane resin as shown in the first figure. In this embodiment, a closed-cell foamed resin layer 4 was interposed between the skin layer 2 and the watertight resin film layer 3 as shown in the figure. Incidentally, reference numeral 5 denotes an insert material made of iron or the like that has a shape-retaining property in the seat cushion material and a joint portion for fixing it to the seat, and this insert material is not essential in the present invention.

The foamed polyurethane resin used in the present invention itself is well known, and the molecule m1. oo.

〜to,ooo, preferably 3,000〜6.00
Polyol components such as 2- to 4-functional polyester polyols, polyether polyols, polycarbonate polyols, polymer polyol blends, TDI,
Consists of polyisocyanate components such as TDI/MD1 and MI)I, amine/tin catalysts, foam stabilizers such as high-activity silicone and low-activity silicone, and foaming agents such as water and Freon-11, as well as additives. It is obtained from a foamable polyurethane resin composition which may contain pigments, flame retardants and the like.

Foam molding of the well-known foamable polyurethane resins as described above can be classified 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 are preferred.

In order to foam-mold a seat cushion material in a desired shape using the above-described foamable polyurethane resin, for example, in the case of a cold cure type, first, raw materials are mixed in a foaming machine according to a predetermined formulation, and then the desired shape is formed. The target product is obtained by pouring into a mold having an inner surface shape, closing the mold, passing through a heat insulating tunnel for curing, and then opening and removing the mold. Particularly in the case of the integral skin foam 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.

The above-described foam molding method itself is 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 (and closed-cell foamed resin layer) is provided on the surface of the seat cushion material formed as described above.

The watertight resin film layer (and closed-cell foamed resin layer) can be provided by attaching them to the surface of the seat cushion material that has already been molded, but it is not possible to form these layers at the same time as molding. preferable.

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

A particularly preferable resin film layer is a polyurethane resin film layer in consideration of adhesiveness with the seat cushion material, and in particular, as a polyisocyanate, for example, water t%
I, hydrogenated XDI, lysine diisocyanate, lysine ester diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, and other aliphatic polyisocyanates are used, while polyurethane resins using polyether polyols or polycarbonate polyols as polyols have color fastness and It is preferable because it has excellent resistance to deterioration. In addition, in order to impart superior weather resistance to the seat cushion material, it is preferable that these watertight resin film layers have sufficient water repellency. It can be used preferably. 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 shown in (L) has a thickness of, for example, 1 to 1100 μm.

Preferred methods for forming these watertight resin film layers on the surface of the seat cushion material are divided into coating methods and film methods. The coating method was to create a paint by dissolving the resin forming the film layer in an organic solvent, and apply a mold release treatment to the paint by spraying or other methods prior to molding at a solid content of 1 to 100 g/♂. The desired coating is formed by coating and drying on the surface of a mold, and then the foamed polyurethane resin is foam-molded.

The film method is a method in which the film is cut into a desired shape, placed on the inner surface of a mold, and similarly foam-molded. In either method, when a silicone-modified polyurethane resin is used as the resin, the resin itself has sufficient mold release properties, so it is possible to omit mold release treatment on the inner surface of the mold. The weather-resistant seat cushion material of the present invention having a watertight resin film layer on its surface is prepared as follows.

Furthermore, in a preferred embodiment of the present invention, when carrying out the above method, a closed-cell foamed resin layer is formed between the seat 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 0.
1 to 5. The thickness is approximately On+m. 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, when using the coating method described above, it is possible to form a watertight resin film layer of the desired thickness on one surface of the closed-cell foamed resin sheet in advance by the coating method, and then apply this layer to the desired thickness. A method in which a watertight resin film of a desired shape and a closed-cell foamed resin sheet are placed on top of each other on the inner surface of a mold in advance. You can use the method to store it.

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.

In addition, when molding the seat 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 body a leather-like surface shape.

In addition, the seat cushion material used in the present invention may be any seat cushion material, such as ski lift seats, theater and baseball stadium seats, chairs, sofa seats, and automobile seats, and is not particularly limited. The effects of the invention are most noticeable in ski resort lift seats that are constantly exposed to wind and rain, and seats in places without roofs. Further, the watertight resin film layer (and closed-cell foamed resin layer) formed on the surface of these seat cushion materials may be provided on the entire surface of the seat cushion material, or may be provided only on the upper surface.

(Effects) According to the present invention as described above, when a seat cushion material made of foamed polyurethane resin is formed as, for example, an integral skin foam, at least some of the skin layer is foamed. Therefore, when used as a seat cushion material for ski lifts, moisture seeps into the interior, and this moisture, severe temperature differences between day and night, direct sunlight, and other harsh environmental conditions cause the foamed polyurethane resin to deteriorate significantly and last for a relatively short period of time. However, according to the present invention, water permeation is prevented by forming a watertight resin film layer on the surface of the seat cushion material, and the problem of -E distribution can be easily solved. .

In a more preferred embodiment, a closed-cell foamed resin layer is interposed between the foamed polyurethane resin and the watertight resin film layer on the surface, so that even if the watertight resin film layer on the surface is damaged, Since water permeation can be prevented, weather resistance and hydrolysis resistance are further improved, and even when sitting in winter, the seat does not feel cold and does not cool the buttocks.

(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 di- to trifunctional polyol (011 value 56), F
-80 (polyisocyanate) 51 parts, Freon-113
, 9 parts, silicone foam stabilizer 1.0 part, tertiary amine catalyst 0.
1 part of stannous octylate, 0.25 parts of stannous 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 lift seats at a ski resort. A 5 μm thick inphoron diisocyanate-polyether polyol type polyurethane resin film (corresponding to the top surface of the material) was placed in a mold that had been adhered in advance, and foam molded, opened and demolded according to the integral Sugikin foam method. A weather-resistant seat cushion material of the present invention was obtained.

The foaming ratio inside this cushion material is approximately 30 times,
The skin layer had a thickness of about 1.5 mm and a foaming ratio of about 1.5 times.

Example 2 Instead of the polyurethane resin film in Example 1, a paint containing the same polyurethane resin (solid content 30%) was sprayed onto the inner surface of the mold and dried to form a polyurethane resin film layer (thickness 30 μm), Others are Example 1
A weather-resistant seat cushion material of the present invention was obtained in the same manner. The foaming ratio inside this cushion material was approximately 30 times, and the skin layer had a thickness of approximately 1.5 mm and the foaming ratio was approximately 1.5 times.

Example 3 Instead of the polyurethane resin paint in Example 2, a silicone-modified polyurethane resin paint (solid content 30%) was sprayed onto the inner surface of the mold and dried to form a polyurethane resin film layer (thickness 20 μm). A weather-resistant seat cushion material of the present invention was obtained in the same manner as in Example 1. The expansion ratio inside this cushion material was 5 times and 30 times, and the skin layer had a thickness of about 1.5 mm and the expansion ratio was about 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%) was sprayed onto the inner surface of the mold and dried to form a polyurethane resin film layer (thickness 10 μm). A weather-resistant seat cushion material of the present invention was obtained in the same manner as in Example 1. The foaming ratio inside this cushion material is about 30 times, and the skin layer is about 1
, 5 mm thick, the foaming ratio was about 18.8 times.

Example 5 Instead of the polyurethane resin film in Example 1, a paint containing the same polyurethane resin (solid content 30%)
A foamed polyethylene sheet with a foaming ratio of 5 times (thickness 0.3
A weather-resistant seat cushion material of the present invention was obtained in the same manner as in Example 1 except for using a composite sheet in which a polyurethane resin film layer (thickness: 20 μm) was formed by spray coating and drying on the surface of the material. The foaming ratio inside this cushion material was approximately 30 times, and the skin layer had a thickness of approximately 1.0 mm and the foaming ratio was approximately 2 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 was not formed in Example 1.

10 liters of each of the seat cushion materials of the comparative test example and comparative example
The sample of the example was cut into a size of Ox10x3, the cut surface other than the surface was completely waterproofed, and left in a tank sprayed with hot water at 80°C for 3 weeks. and foamed polyethylene layer) were peeled off, and the strength retention rate and depth retention rate were measured, and the following results were obtained.

(Left below) γ-1 Sample % %Example 1
95 98 Example 2 98
99 Example 3 96 96 Example 4 97 97 Example 5 9
5 99 Example 5" 94
96 Comparative Example 1 35 24 In Example 5', a cut with a length of 5 cm was made with a knife only in the surface resin film layer before the test.

Furthermore, when the seat cushion material of Example 5 was stored in a freezer at -20° C. for 1 hour and a person sat on it, the cooling sensation was significantly improved compared to that of Comparative Example 1.

[Brief explanation of the drawing]

Fig. 1 schematically shows a cross section of the seat cushion material of the present invention, and Fig. 2 schematically shows a cross section of a conventional seat cushion material.
It is.

Claims (5)

[Claims] (1) A weather-resistant seat cushion material, characterized in that a watertight resin film layer is formed on the surface of a seat cushion material formed from polyurethane foam resin. (2) The seat cushion material according to claim 1, wherein a closed-cell foamed resin layer is laminated between the foamed polyurethane resin and the watertight resin film layer. (3) The seat 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. (4) The seat cushion material according to claim 1, which is used for ski lifts. (5) In a method of molding a seat cushion material of a desired shape by reacting and foaming a foamable polyurethane composition containing a polyol component and a polyisocyanate component in a mold, a watertight resin film layer or a watertight 1. A method for producing a weather-resistant seat cushion material, which comprises disposing a polyurethane resin film layer and a closed-cell foam resin layer, and then injecting and foaming a foamable polyurethane composition.