JPS60130630A - Production of polyurethane foam - Google Patents

Abstract

PURPOSE:To obtain a polyurethane foam excellent in high-frequency sealability, by mixing a specified polyol with a blowing agent, a catalyst, and an organic isocyanate, expansion-molding the mixture and adjusting the air permeability of the obtained foam to a specified value. CONSTITUTION:A polyol containing a thermoplastic resin molecule incorporated in its molecule is mixed with a blowing agent, a catalyst, and an organic isocyanate, and the mixture is expansion-molded so that the air permeability of the foam may be adjusted to 150cc/cm<2>/sec or below. Said polyol can be produced by incorporating a molecule of a thermoplastic resin such as vinyl chloride in producing a polyol by copolymerizing a stating material such as ethylene glycol with ethylene oxide or the like. The adjustment of air permeability is performed by adjusting the amount of a catalyst. Generally, the air permeability is decreased by decreasing the amount of catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a polyurethane foam with excellent high frequency weldability.

This type of urethane foam covers the outer material and lining,
It is subjected to high-frequency processing and used for vehicle interior materials and cushion upholstery materials. As methods for manufacturing polyurethane foam having high-frequency fusion properties, there are known methods of adding and mixing a thermoplastic resin and methods of impregnating the foam with a thermoplastic resin liquid.

The former method involves simultaneously adding and mixing thermoplastic resin powder with excellent high frequency fusion properties such as nylon resin, polyvinyl chloride resin, and acrylic resin to a predetermined S91J urethane raw material.
This is a method of obtaining polyurethane foam.

In this method, the more thermoplastic resin is added, the higher the high-frequency fusion properties are.
There is a problem that the elastic properties (such as elastic properties) deteriorate.

The latter method involves slicing polyurethane foam into pieces of arbitrary thickness (usually about 3 mm to 20 mm), impregnating them with a thermoplastic resin liquid such as polyvinyl chloride paste or acrylic emulsion, and drying or curing them. This is a method of imparting high frequency fusion properties.

However, this method also has the disadvantage that the original physical properties of the polyurethane foam are degraded, the one-shot resilience is degraded, and the tactile sensation is also significantly poor.

The present invention was made to solve these problems.
The object of the present invention is to provide a method for producing polyurethane foam that can improve high-frequency fusion properties without impairing the physical properties of the polyurethane foam.

That is, in the present invention, JIJol, in which thermoplastic resin molecules are incorporated into polyol molecules, is mixed with a blowing agent, a catalyst, and an organic incyanate, and foam molded, and the air permeability of the foam is increased to 150 CL/cnr''/ It is characterized in that the temperature is adjusted to 1 dec or less. It is also characterized in that a phosphate ester flame retardant is further added to the above mixture and foam molding is carried out.

The present invention will be explained in detail below.

A polyol having thermoplastic resin molecules incorporated into the polyol molecule is prepared. This lIJ-olha, ethylene glycol, diethylene glycol, zolopylene glycol, butylene glycol (bifunctional), glycerin, trimethylol 7' Gl 9-9, trimethylolethane (trifunctional), pentaerythritol, ethylenediamine, When producing polyols by polymerizing propylene oxide, ethylene oxide, butylene oxide, styrene oxide, etc. to a starting material such as α-methyl glycostate (tetrafunctional), molecules of thermoplastic resins such as vinyl dichloride and acrylic are incorporated. Manufactured. In this case, the ratio of the thermoplastic resin is preferably 20 to 60% by weight, taking into account the physical properties of 7 ohm urethane and high frequency fusion properties.

Next, this polyol is mixed with a blowing agent, a catalyst, an organic incyanate, and, if necessary, additives. As a foaming agent,
Examples include water, trichloromonofluoromethane, methylene chloride, and the like.

Catalysts include amine catalysts and tin catalysts; amine catalysts include ethylenediamine, trimethylamine, n-ethylmorpholine, triethanolamine, and the like; tin catalysts include starus octoate, digtyltine dilaurate, and the like. Examples of organic incyanates include tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, and the like. Additionally, colorants, flame retardants, fillers, etc. may be mentioned as additives that may be added as necessary.

The amount of these added is not particularly limited, but usually 2.
0 to 7.0 parts by weight and 0.03 to 1.0 parts by weight of catalyst are preferred.

Foam molding of these mixtures is carried out using the one-shot method or the blurring method according to conventional methods. Although this is done by the reaming method, the air permeability of the resulting urethane foam is 150mm/α"7s.
ec or less, preferably 5 to 150 cc/cm2/s
Adjust so that it becomes ee. This adjustment method is carried out by adjusting the amount of catalyst. That is, generally by reducing the amount of catalyst, the air permeability can be kept low.

The reason why the air permeability is set to 150 CC/crn2/see or less is that if the upper limit is exceeded, high frequency energization time will be required during high frequency processing, and soot and goo will easily occur.
This is because deterioration and burning cause scorching and the appearance becomes very poor.

The polyurethane foam obtained in this way has thermoplastic resin molecules with good high frequency fusion properties incorporated into the molecules of J IJ All, so it has high frequency fusion properties while retaining the physical properties of polyurethane foam. can be improved.

Furthermore, the high frequency fusion properties can be made uniform at each location T (D) of the polyurethane foam.

Furthermore, the breathability of the urethane foam is 150cc/cm27
Since it is less than SeC, the high frequency current application time is short and the current in the electrode plate is small, so there is no occurrence of sagging or bending. Accordingly, this makes it possible to improve the frequency weldability.

In addition to high frequency welding, this polyurethane foam can also be heat fused,
Ultrasonic II! I! Of course, other fusing means such as layers may also be used.

Next, the second invention will be explained.

This invention is a method of using a phosphate ester flame retardant as a flame retardant when mixing a blowing agent, a catalyst, an organic incyanate, and a flame retardant with a polyol in the first invention described above. The flame retardant is tricresyl phosphate,
Examples include triphenyl phosphate and tri-2-ethylhexyl phosphate. The amount of this flame retardant added is preferably 15 to 30 M parts per 100 parts by weight of the polyol in consideration of the flame retardant effect.

In this way, polyurethane foams containing phosphate ester flame retardants do not cause scratches during high-frequency processing compared to cases where other flame retardants are used, and have improved high-frequency fusion properties. I can do it. This fact was clarified by the inventor through experiments.

Next, examples of the present invention will be described.

Example Work A compound having the following composition was foam-molded using a one-shot method, and the foam density was 0.023. Air permeability 53 cc/('m2/
8611! Made of soft polyurethane foam.

The urethane foam thus obtained has a thickness of 10I.
Slice into lII+ 1. ff IJ ester line fiber outer material and black nylon thread nonwoven fabric were layered) and subjected to high frequency processing using a high frequency processing machine at a current of 3.3 A and a drying time of 17 seconds. As a result of examining the peel strength of this laminate, 3
．． 0 kl? /30 *tI and crushed.

In addition, the urethane foam has a tensile strength of 1.10 and 9/er.
r? Furthermore, when the physical properties of this polyurethane foam were investigated, the properties of the polyurethane foam were well maintained, with a tensile strength of 1.10 kg/m'', a tear strength of 6 kg/lyn, and an elongation of 160 inches. was.

As is clear from the above results, according to the present invention, the physical properties of urethane foam can be improved by incorporating a thermoplastic resin into the polyol molecule and by controlling the air permeability of the foam to 150 cc/crn2/sec or less. By significantly increasing high-frequency fusion properties without deteriorating physical properties, and by using a phosphate ester-based flame retardant,
0 which has a remarkable effect of further increasing high frequency fusion properties.

Claims (2)

[Claims] (1) A polyol in which thermoplastic resin molecules are incorporated into polyol molecules, a blowing agent, a catalyst, and an organic incyanate are mixed and foam-molded to increase the air permeability of the foam to 150%.
A method for producing polyurethane foam, which comprises adjusting the foam to cc/cm2/sec or less. (2) A polyol in which a thermoplastic resin molecule is incorporated into a polyol molecule, a blowing agent, a catalyst, an organic isocyanate, and a phosphoric acid ester flame retardant are mixed and foam-molded, and the air permeability of the foam is 150 CC/1yn2. A method for producing polyurethane foam, characterized by adjusting the foam to less than /see.