JPH018355Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a laminate for high-frequency processing used for vehicle seat covers, interior materials, furniture cushion covers, etc. This type of laminate is constructed by covering a polyurethane foam with a front material and a lining material, which is subjected to high frequency processing and used for the above-mentioned purposes. Therefore, polyurethane foam used for this type of application must have excellent high frequency welding properties. Conventional polyurethane foam with high frequency weldability is made by adding and mixing thermoplastic resin powder with excellent high frequency weldability, such as nylon resin, polyvinyl chloride resin, or acrylic resin, to a specified polyurethane raw material and foam-molding it. There is. However, because this polyurethane foam contains a large amount of thermoplastic resin, it has the inherent physical properties (tensile strength, tear strength, etc.) that polyurethane foam has.
There is a problem in that the elastic properties (such as elastic properties) deteriorate. Alternatively, any thickness (usually 3 mm ~
There are products in which polyurethane foam sliced into pieces (about 20 mm) is impregnated with a thermoplastic resin liquid such as polyvinyl chloride paste or acrylic emulsion, and then dried or cured. However, since this polyurethane foam is also impregnated with a thermoplastic resin liquid, it has the disadvantage that the original physical properties of the polyurethane foam are reduced, the rebound properties are reduced, and the tactile sensation is also significantly deteriorated. The present invention was developed to solve these problems, and the purpose is to create a laminate for high-frequency processing that can improve high-frequency weldability without impairing the physical properties of polyurethane foam. It's something you're trying to gain. In other words, the laminate for high-frequency processing of the present invention is a breathable 150c.c.
It is equipped with a polyurethane sheet of cm ² /sec or less, and an outer material and a lining material covered with the same sheet. The present invention will be explained below based on illustrative embodiments. The drawing shows a cross-sectional view of the laminate. This laminate is constructed by covering a polyurethane foam sheet 1 with an outer material 2 and a lining material 3. The polyurethane sheet 1 is mainly made of polyol in which thermoplastic resin molecules are incorporated into polyol molecules, to which a phosphate ester flame retardant is added, and has air permeability of 150 c.c./cm ² /sec or less. Polyols include starting materials such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol (bifunctional), glycerin, trimethylolpropane, trimethylolethane (trifunctional), pentaerythritol, ethylenediamine, and α-methylglycotide (tetrafunctional). Polyols are produced by incorporating molecules of thermoplastic resins such as vinyl chloride and acrylic into polyols by polymerizing propylene oxide, ethylene oxide, butylene oxide, styrene oxide, etc. In this case, the proportion of the thermoplastic resin is preferably 20 to 60% by weight, taking into account the physical properties of the urethane foam and the high frequency weldability. The phosphate ester flame retardant added to this polyol basically makes the polyurethane sheet 1 have a flame retardant, but it is also added to prevent the generation of sparks during high frequency processing and improve high frequency fusion properties. It is something. Phosphate ester flame retardants include tricresin phosphate, triphenyl phosphate,
Tri-2-ethylhexyl phosphate or the like is used. The amount of this flame retardant added is preferably 15 to 30 parts by weight per 100 parts by weight of the polyol, taking into account the flame retardant effect of polyurethane and the effect of preventing spark generation. The polyurethane sheet 1 of this invention is produced by mixing the polyol and phosphate flame retardant with a foaming agent, a catalyst, an organic isocyanate, and if necessary a coloring agent and a filler, followed by foam molding. As a blowing agent, water, trichloromonofluoromethane, methylene chloride, etc. are used. As a catalyst, amine catalysts such as ethylenediamine, trimethylamine, n-ethylmorpholine, and triethanolamine, and tin catalysts such as starus octoate and dibutyltin dilaurate are used. As the organic isocyanate, tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, etc. are used.
The amounts of these additives are not particularly limited, but usually 2.0 to 7.0 parts by weight of the blowing agent (in the case of water) and 0.03 to 1.0 parts by weight of the catalyst are preferable to 100 parts by weight of the polyol. Foam molding of this formulation improves the air permeability of the foam by adjusting the amount of catalyst.
150c.c./cm ² /sec or less, preferably 5 to 150c.c./
cm ² /sec. Here the breathability is 150
The reason for setting it below cc/cm ² /sec is that if the upper limit is exceeded, high-frequency energization time will be required during high-frequency machining, sparks will easily occur, deterioration and scorching will occur, and the appearance will be very poor. It is. The outer fabric 2 and the lining 3 covering the polyurethane foam sheet 1 constructed in this way are made of a material that does not melt at the internal heat generation temperature caused by high frequency waves. As the outer material 2, for example, a plain weave fabric, a woven fabric such as moquette, a non-woven fabric, etc. made of materials such as nylon, polyester, and acrylic are used. The lining 3 is the same as the outer material 2, but is generally made of nonwoven fabric. The laminate for high frequency processing configured in this way is
Since the polyurethane foam sheet 1 incorporates thermoplastic resin molecules with good high-frequency fusion properties into polyol molecules, the high-frequency fusion properties can be improved while maintaining the physical properties of the polyurethane foam sheet 1. . Moreover, the high frequency fusion properties at each location of the polyurethane foam sheet 1 can be made uniform. Also, since the breathability of the polyurethane foam sheet 1 is less than 150 c.c./cm ² /sec,
There is no spark because the high frequency energization time is short and the current in the electrode plate is small. Therefore, this also makes it possible to improve the high frequency weldability. Furthermore, since a phosphoric acid ester-based flame retardant is used, sparks are not generated during high frequency processing, and high frequency fusion properties can be improved compared to cases where other flame retardants are used. Next, examples of the present invention will be described. Example 1 A compound with the following composition was foam-molded using a one-shot method to obtain a foam density of 0.024 and air permeability of 63 c.c./
A flame retardant flexible polyurethane foam of cm ² /sec was obtained.

[Front] This urethane foam is sliced into 10 mm thick pieces, a polyester fiber outer layer and a nylon non-woven fabric lining are laminated, and a high frequency processing machine is used to create a
High frequency processing was performed at 3.3A and 17 seconds of current.
As a result, no sparks were generated and good machining was achieved. In addition, the peel strength of the obtained laminate is
It was excellent at 3.1Kg/30mm. Furthermore, the urethane foam has a tensile strength of 1.05Kg/cm ²
The physical properties of the polyurethane foam were well maintained with a tear strength of 0.6 Kg/cm and an elongation of 160%. Example 2 A compound with the following composition was foam-molded using a one-shot method, with a foam density of 0.023 and an air permeability of 19 c.c./cm ² /sec.
A soft polyurethane foam was obtained.

【table】

[Table] When this polyurethane foam was subjected to high frequency processing under the same conditions as in Example 1, no sparks were generated and good processing was performed. Moreover, the peel strength of the obtained laminate was excellent at 3.5 kg/30 mm. In addition, when the physical properties of this polyurethane foam were investigated, the tensile strength was 1.1 Kg/cm ² and the tear strength was 0.65.
Kg/cm, elongation was 160%, and the properties of polyurethane foam were well maintained. As is clear from the above results, according to the present invention, a thermoplastic resin is incorporated into the polyol molecule, a phosphate ester-based flame retardant is used, and the air permeability of the foam is increased to 150 c.c./cm ² . By using a polyurethane foam sheet with a temperature of less than /sec, the high-frequency fusion properties are significantly improved without deteriorating the physical properties of polyurethane, making it extremely suitable for interior materials for vehicle seat covers, cushion covers for furniture, etc. be.

[Brief explanation of the drawing]

The drawing is a sectional view of a laminate for high frequency processing showing an embodiment of the present invention. 1... Polyurethane foam sheet, 2... Outer material, 3... Lining.

Claims (1)

[Claims for Utility Model Registration] (1) Air permeability 150cc/cm 2 /sec made by foam molding a compound consisting mainly of a polyol with thermoplastic resin molecules incorporated into the polyol molecule and a phosphate ester flame retardant ^added . A laminate for high-frequency processing, comprising the following polyurethane sheet, and an outer material and a lining material covered with the same sheet. (2) Utility model registration request for polyol in which 20 to 60 weight percent of thermoplastic resin molecules are incorporated into the polyol molecule, and 10 to 50 parts by weight of a phosphate ester flame retardant is added to 100 parts by weight of the polyol. A laminate for high-frequency processing according to item 1.