JPS6234914A - Production of flame-laminatable flame-retardant flexible polyurethane foam - Google Patents

Abstract

PURPOSE:To obtain the titled polyurethane foam having excellent heat-resistance and aging stability, by using specific polyol, catalyst and additive, etc., in the production of flexible polyurethane foam from an organic polyisocyanate, polyol, catalyst, additive, etc. CONSTITUTION:The objective flexible polyurethane foam is produced from an organic polyisocyanate, a polyol, a foaming agent, a foam stabilizer, a catalyst, a flame retardant and other additives, by using a polyol mixture composed of 70-10pts.(wt.) of a polyester ether polyol having 2-3 functional groups as the polyol and 30-90pts. of a polypropylene glycol adduct having 2-4 functional groups, and using 3-40pts. of a phosphorus compound, <=3pts. of an amine catalyst containing active hydrogen group, and <=5pts. of one or more compounds selected from zinc oxide, magnesium oxide and boric acid as a part of the additive. EFFECT:A laminating raw material resistant to discoloration and deterioration of the skin and the foam can be produced.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is applicable to cushioning materials and fabrics, such as cushioning skin materials and ceiling materials for automobile seats, upholstery materials for furniture sofas, and upholstery materials for beds. The present invention relates to a method for manufacturing a flame-retardant flexible polyurethane foam that can be laminated with a skin material and a frame, as a cushioning composite material made by stretching a skin material such as leather or leather.

(Prior technology) In recent years, flexible polyurethane foam has been laminated with other sheet-like materials such as fabric and leather to provide cushioning properties and a textured surface material that is widely used in automobile interior materials and furniture. has been done.

Bonding methods include using adhesives and directly bonding the surface of the flexible polyurethane foam to fabric using a high-frequency welder or flame. The lamination method does not require a drying process, has a fast adhesion speed, and can be assembled in an efficient manner, so the method of laminating soft polycrethane foam with other sheet materials is widely used as an industrially established method. ing.

On the other hand, in the United States, urethane laminate materials used as automobile interior materials are required to have flame retardancy that complies with MVSB-302, and flexible polyurethane foam has been made flame retardant, and various laminate materials with flame retardant foam have been made. being developed.

For example, polyester urethane foam is made flame retardant using tetragenated sulfates as a flame retardant, and polyether polyol foam is used as a reactive flame retardant to improve flame lamination characteristics. Some use phosphorus- or halogen-containing compounds.

(Problems to be Solved by the Invention) However, it has been found that all of these types of foams have drawbacks in that the laminated fabrics and foams change color or deteriorate over a long period of time. The material is heated under certain conditions (for example, 100°C in a sealed system)
When an accelerated test was conducted for about 150 to 300 hours, discoloration of the fabric and deterioration of the foam were observed, indicating that there were problems in terms of heat resistance and stability over time.

The main purpose of this invention is that frame lamination is possible.
, has flame retardant properties that comply with MVSB-302,
The object of the present invention is to provide a flexible polyurethane foam with good heat resistance that does not cause discoloration or deterioration of the laminate material even under the above-mentioned certain conditions that are practically effective.

(Means for Solving the Problems) As a result of examining various conventional flame retardant foams for laminates, the present inventor found that a major factor in the decrease in heat resistance and stability over time may lie in the flame retardant used. The result of estimation and consideration is q′! We discovered that the combination of flame release agent and polyol, blowing agent, foam stabilizer, catalyst and other additives has a remarkable effect on flame laminate properties, flame retardancy, heat resistance, and stability over time. This invention has been made.

That is, this invention provides the following methods: A polyester ether having 2 to 3 functional groups as the polyol when producing a flexible polyurethane foam by mixing and reacting an organic polyisocyanate with a polyol, a blowing agent, a foam stabilizer, a catalyst, a flame retardant, and other additives. 10 to 10 parts by weight of polyol and 2 to 2 functional groups
B: using 30 to 90 parts by weight of the polyglopylene glycol adduct of No. 4; B: using 3 to 40 parts by weight of a phosphorus compound based on 100 parts by weight of the above polyol; and C: using up to 3 parts by weight of an amine catalyst having an active hydrogen group. D Zinc oxide, magnesium oxide,
This is a method for producing a 7-ohm flame-retardant flexible polycrethane that can be flame laminated, characterized in that 5 parts by weight or less of one or more oxides selected from boric acid are used.

The polyester ether polyol having 2 to 3 functional groups is
For example, as shown in Japanese Patent Publication No. 4B-10clB, it is a polyol that is easy to heat melt and has excellent flame laminating properties. Carboxylic acid residue, a ring-opened residue of a compound with a cyclic ether group t, where t is a number larger than 1 on average, m is 0 or 1. It is a polyol with a blocked structure.

In the present invention, even if this polyester ether polyol is not used alone, it can be used in combination with other commonly used polyether polyols to provide frame 2 laminate properties exceeding a certain standard. The polypropylene glycol adduct having a functional group number of 2 to 4 used in combination is a polypropylene glycol with a molecular weight of about 1000 to 6000, which is used for general flexible polyurethane foam, and can change the mechanical properties and cushioning properties of the foam as desired. In addition, since this type of polyol is inexpensive, the overall cost of the polyol can also be reduced.

As the phosphorus compound, halogen-containing sulfate esters and non-halogen-containing sulfate esters can be used, such as tris(chloroethyl) phosphate, tris(dichloropropyl) phosphate, tris(chloropropyl), etc. Nophosphate, bis(2% 3-dipromoglovir) 2.3-
Dichloropropyl phosphate, tris(2,3-dibu0-1:propyl) phosphate, trimethyl phosphate, triethyl phosphate, tributyl phosphate, trioctyl phosphate, triptoxyethyl phosphate), )'J phenyl phosphate, tricresyl phosphate , cresyl diphenyl phosphate, octyldiphenyl phosphate, tricylenyl phosphate, etc. Of course, it is not limited to these. If the amount of the phosphorus compound is less than 3 parts by weight, it will be difficult to obtain the desired flame retardancy, and if it exceeds 40 parts by weight, it will be difficult to improve the flame retardance. This is not preferable because the mechanical strength becomes low.

This is because polyurethane foam lacks stability when foaming) and is expensive.

Examples of amine catalysts having active hydrogen groups include dimethylaminoethanol, dimethylaminoethoxyethanol, N
, N, N'-) lythylaminoethylethanolamine, M, N, N'-) lythylaminopropylethanolamine% 1.3-bis(N, N-dimethylamino-2-glupanol, N, N% N/f Tetramethyl f-(2-hydroxy)ethyltriethylenediamine, N, N% N% N-bis(3-dimethylaminopropyl)amino-2-glopanol, N1 Methyl-N'-(2-hydroxyethyl)piperazine, N-Methyl-N'-(2-
Examples include hydroxypropyl)piperazine, Pi-(2-hydroxyethyl)morpholine, and 3-(dimethylaminocopropylamine carbonate).

= 1 - If the amine catalyst having active hydrogen groups exceeds 3 parts by weight, the amount of heat generated during foaming of the urethane foam increases, resulting in scorch in the foam, and stability during foaming of 7 ohm is lacking. B. One or more oxides selected from zinc oxide, magnesium oxide, and boric acid are used as part of the additive, which is undesirable because it causes a decrease in physical properties, in an amount of 5 parts by weight or less, preferably 3 parts by weight or less. However, if the amount added exceeds 5 parts by weight, the flame retardant performance will drop significantly and the polyurethane foam will become easily flammable, which is not preferable.

The organic polyisocyanate, blowing agent, foam stabilizer, and other additives may all be those commonly used for producing flexible urethane foam.

(Example and Comparative Example) In addition, the total thickness of each flexible polyurethane foam was L5.
A sheet of ntfn was melted on the front and back sides under conditions of a flame temperature of about 1000°C, and a polyester/polyamide 80/20 woven fabric with a penetration amount of t-'yoP/- and a nylon backing fabric were overlapped and crimped to form a 1011 m thick foam and woven fabric. A cloth laminate material was created and flame retardancy and heat resistance tests were conducted.

Test method Density: J Engineering 5K-6401 Flame retardant test of flexible polyurethane foam: 1ffSS-
Section 302 Heat resistance EM of flexible polyurethane foam: Put two sheets of flexible polyurethane foam of about 10 x 200 x 1 OX into a 1 ton glass bottle and seal.

After heating at 100° C. for 300 hours, the presence or absence of a decrease in mechanical strength such as tensile strength was examined.

Flame retardancy test for laminate materials: Item M'7SS-302 Heat resistance test for laminate materials: Fix a stapler (trade name, manufactured by Max Co., Ltd.) at any point on a laminate product of about 150 x 200 mm, and The mixture was placed in a glass bottle, sealed, and heated at 100°C for 200 hours. After heating, the presence or absence of discoloration of the skin material and the presence or absence of rust on the staples were examined.

(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 bridging properties that meet the MVSB-302 standard and is also heat resistant. It is possible to obtain an excellent laminate material with little discoloration or deterioration of the fabric or foam constituting the material.

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 polyester ether polyol 70 having 2 to 3 functional groups as a polyol; 〜10 parts by weight and number of functional groups 2〜
B: using 30 to 90 parts by weight of the polypropylene glycol adduct of No. 4; B: using 3 to 40 parts by weight of a phosphorus compound based on 100 parts by weight of the above polyol; C: using 3 parts by weight or less of an amine catalyst having an active hydrogen group. , D Zinc oxide, magnesium oxide as part of the additives,
A method for producing flame-retardant flexible polyurethane foam that can be flame laminated, characterized in that 5 parts by weight or less of one or more oxides selected from boric acid are used.