JPS61141722A - Production of flame-laminatable, flame-retarding flexible polyurethane foam - Google Patents

Abstract

PURPOSE:To obtain the titled foam excellent in flame laminatability, heat resistance and prolonged stability, by producing a flexible urethane foam by using a specified combination of flame retardants and a specified combination of polyols. CONSTITUTION:In the production of a flexible polyurethane foam by mixing and reacting an organic polyisocyanate with a polyol, a blowing agent, a catalyst or other additives, said polyol comprises 60-10pts.wt. di--tri-hydric polyester ether polyol and 40-90pts.wt. trihydric polypropylene glycol adduct, and said flame retardant comprises 2-30pts.wt. aromatic phsophate ester compound and 1-10pts.wt. bi-functional bromine-containing compound. The aromatic phosphate ester compound used is one which can act as a compound for improving fusibility as well as a flame retardant and has an effect of not only imparting flame retardancy to foam but also reducing the amount of the polyester ether polyol used.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is applicable to shoe-sheen skin materials and ceiling materials for automobile seats, sofa upholstery materials and bed upholstery materials for furniture, and shoe-sheen materials. This invention relates to a method for manufacturing a flame-retardant flexible polyurethane foam that can be laminated with a skin material as a cushioning material of a cushioning composite material made of skin materials such as cloth or leather laminated together with a frame.

(Prior technology) In recent years, flexible polyurethane foam and other sheet-like materials such as fabric and leather have been laminated to create shoe sheen materials, which are widely used in automobile interior materials and furniture as surface materials with a good feel and bulk. has been done.

Bonding methods include using adhesives, or directly bonding the surface of the flexible polyurethane foam to fabric by using a high-frequency welder or flame. The lamination method does not require a drying process (a) and is an efficient method with fast adhesion speed, so the method of laminating flexible polyurethane foam and other sheet materials is widely used as an industrially established method. There is.

On the other hand, in the United States, urethane laminate materials used as automobile interior materials are required to have flame retardant properties that comply with MVSS-302, and flexible polyurethane foams have been made flame retardant, and laminate materials with flame retardant foams have been made into flame retardants. Various types have been developed.

For example, it reacts as a flame retardant with polyester tarethane foam made flame retardant using halogenated phosphate esters as a flame retardant, and with polyether polyol t-a, which has improved flame lamination characteristics with 7 ohms. Some use phosphorus- or halogen-containing compounds of the type.

(Problems to be Solved by the Invention) However, it has been found that all of these types of foams have drawbacks such as discoloration and deterioration of the fabric and foam of the laminate material over a long period of time. under certain conditions (100℃ x 150~ in a sealed system)
When an accelerated test was carried out for about 200 hours, discoloration of the fabric and deterioration of 7 ohms were observed, indicating that there were problems in terms of heat resistance and stability over time.

The present invention is mainly concerned with a flexible polyurethane foam that has flame-laminated properties, has flame retardancy that complies with MVSS-302, and does not cause discoloration or deterioration of the laminated material even under the above-mentioned certain conditions that are practically effective. The purpose is to provide the following.

(Means for Solving the Problem) As a result of examining various conventional flame retardant foams for laminates, the inventor of the present invention found that a major factor in the decrease in heat resistance and stability over time may lie in the flame release agent used. We have estimated that the combination of a specific flame retardant and a polyol can have a remarkable effect on the properties, flame retardancy, heat resistance, and stability over time of 7-laminated laminates, and have arrived at this invention.
It is something that

That is, this invention provides the following methods: When producing soft polycrethane 7 ohm by mixing and reacting an organic polyisocyanate with a polyol, a blowing agent, a foam stabilizer, a catalyst, and other additives, as an input polyol,
2-3 functional polyester ether polyol 60-1
0 parts by weight and 40 to 90 parts by weight of a substantially trifunctional polypropylene glycol adduct; B. 2 to 3 aromatic phosphate compounds as a flame retardant;
0 parts by weight, and 1 to 10 parts by weight of a difunctional bromine-containing compound.

Polyester ether polyol is manufactured by Tokuko Showa 4th-100.
As shown in No. 78, flexible polyurethane foam produced using this material is easily melted by heat,
Made with polyol that has excellent flame laminating properties.
For example, the general formula % formula % (wherein R is a saturated aliphatic or aromatic polycarboxylic acid residue, A is a ring-opened residue of a compound having a cyclic ether group, L
is a number larger than 1 on average, m1io or Fil) It is a polyol having a nine-structure structure in which a chain consisting of polyester bonds is blocked by a polyether compound.

In this invention, flame laminating properties exceeding a certain standard can be imparted not only by using this polyester ether polyol but also by using it in combination with other commonly used polyether polyols. This also solves the disadvantages of using it alone.

In other words, polyester ether polyol and other general-purpose polyols are used together in a ratio of 60/4o-10/90, and if the polyester ether polyol exceeds 60 parts by weight, the compressive residual strain of 7 ohms will be large and the stiffness will be large. Practically undesirable as Y material,
If the amount is less than 10 parts by weight, the flame laminate properties will not meet a certain standard and the object of the invention will not be achieved.

The polyol for general soft polyurethane 7 ohm used in combination is essentially a trifunctional polyglobylene glycol adduct, and by using it in the above ratio, the mechanical properties and cushioning properties of 7 ohm can be improved. At the same time, since this polyol is inexpensive, it also reduces the cost of the polyol.

Aromatic phosphate ester compounds are coated with flame retardants and
It improves fusion properties and is effective not only in making the foam flame retardant, but also in reducing the amount of polyester ether polyol used.

Aromatic phosphate ester compounds used in this invention include triphenyl phosphate, tricresyl phosphate, octyldiphenyl phosphate, and! Examples include resin diphenyl phosphate, trixylenyl phosphate, and triaryl phosphate.

The difunctional bromine-containing compound not only prevents deterioration in flame retardant properties due to volatilization of the flame retardant and imparts high flame retardancy, but also improves 7 ohm heat resistance and enhances stability over time. Examples of difunctional bromine-containing compounds include dibromoneopentyl glycol, tetrabromo bisphenol,
Examples include 2,2-bis(4-hydropethoxy-3,5-dibromophenyl)propane.

2 to 30 parts by weight of aromatic phosphate ester compound and 2
1 to 10 parts by weight of the functional bromine-containing compound are used. If the amount of aromatic phosphoric acid ester is less than 2 parts by weight, the fusion properties will be improved.
In addition, it is not desirable for improving flame retardancy, and if it exceeds 30 parts by weight, no improvement in fusion properties is observed, which increases costs, and the physical properties of 7 ohms, especially hardness, are low. I don't like it.

If the amount of the difunctional bromine-containing compound is less than 1 part by weight, it will be difficult to obtain the desired flammability, and if it exceeds 10 parts by weight, the foam will lack stability during 7-ohm urethane foaming and become expensive. be. By using an aromatic phosphate ester compound and a halogen-based bromine-containing compound together as a flame release agent, the flame retardance is synergistically improved, as is clear from the examples described later, and it is better to use them alone. This also resulted in the effect that only a small amount of flame retardant was required.

In addition, in this invention, the flammability of 7 ohms is MVBB.
-302, it is sufficient to use two kinds of aromatic phosphate ester compounds and difunctional bromine-containing compounds in combination as described above, but if necessary, flame retardant properties may be added. In cases where improvement is desired, a small amount of commonly used halogenated phosphate esters may be used to the extent that discoloration or deterioration of the 2-laminate material does not occur under certain conditions. In this invention, a small amount may be used as a medium for a bromine-containing compound in some examples. When using this halogenated phosphate ester, it is preferably about 10 parts by weight or less. Halogenated phosphate esters known as general flame retardants include Hatris (β-chloroethyl) phosphate and Tris (β-chloroethyl) phosphate.
-chloropropyl) phosphate, etc.

Other components used in the present invention, ie, organic polyisocyanate, blowing agent, catalyst, foaming agent, etc., may all be those conventionally used for producing 7-ohm flexible urethane.

(Examples and Comparative Examples) A combustion test was conducted on flexible polyurethane foams produced by foaming according to the formulations shown in Table 1. In addition, each flexible polyurethane foam has a thickness of 11cm and a length of 20,005m.
, a 1,400 m long sheet of polyester whose surface has been melted under flame temperature conditions of approximately 1,000°C and flame-retardant treated.
A laminate material of 7 ohm and woven fabric was created by overlapping and pressing a polyamide woven fabric, and a flammability test and a heat resistance test were conducted.

Test method Density: J-8 K 6401 Flammability test of flexible polyurethane foam: MV8B-3
Flame retardancy test of 02 laminate material: MVE3B-302 Heat resistance test of laminate material: 12
Put a laminated product of about 150x200 in size and seal it.
It was heated at 100°C for 200 hours.

(Effects of the Invention) As is clear from the above results, according to the present invention, frame lamination with fabric etc. can be performed well, and the laminated material has flame retardancy that meets the MV8B-302 standard. It is possible to obtain an excellent laminate material that has excellent heat resistance and stability over time, and has little discoloration or deterioration of the fabric and foam that make up the material.

Furthermore, since a large amount of inexpensive general polyol can be used, the cost is also reduced. Furthermore, since flame retardancy is synergistically improved by using a flame retardant, the amount of flame retardant used may be small.

Claims (1)

[Claims] When producing a flexible polyurethane foam by mixing and reacting an organic polyisocyanate with a polyol, a blowing agent, a foam stabilizer, a catalyst, and other additives, A, as the polyol,
2-3 functional polyester ether polyol 60-1
0 parts by weight and 40 to 90 parts by weight of a substantially trifunctional polypropylene glycol adduct; B. 2 to 3 aromatic phosphate compounds as a flame retardant;
0 parts by weight, and 1 to 10 parts by weight of a difunctional bromine-containing compound.