JPS5863747A - Polyurethane composition - Google Patents

Abstract

PURPOSE:A polyurethane composition useful as a building material, etc., having improved flame retardance and tensile strength, obtained by blending polyurethane with a reaction product of an acidic phosphoric ester and a metal hydroxide. CONSTITUTION:100pts.wt. polyurethane is blended with 5-200pts.wt. composition as a flame-retardant obtained by treating an acidic phosphoric ester with a metal hydroxide (especially aluminum hydroxide) in a molar ratio of phosphoric acid group/hydroxyl group of 0.01-0.5 in an inert solvent at 50-150 deg.C for 1min-3hr with stirring, removing the medium by filtration, etc., drying the residue.

Description

DETAILED DESCRIPTION OF THE INVENTION Polyurethanes can be obtained in a wide variety of properties by varying the amounts of polyols, polyisocyanates and additives, and can be made from soft to semi-hard to hard. It can be obtained in a variety of shapes, from solid fist shapes to foam shapes, so it has been put into practical use in a wide range of fields. Therefore, there are many uses such as 111KIm11N family and industrial products that require 5KII flammability, and therefore research on converting polyurethane into m-form has been carried out for a long time. Conventional methods for converting polyurethane into vaim include adding red phosphorus, metal hydroxides, phosphorus, or non-rogen-containing polyols, and forming an isocyanurate ring in a single chain. , especially metal hydroxide 4I-
Aluminum hydroxide is relatively commonly used because it is effective in plowing. However, metal hydroxide powder is difficult to uniformly disperse in liquids such as polyols, which are raw materials for polyurethane, and therefore not only does it not exhibit a sufficient flame release effect, but also deteriorates its physical properties.

Therefore, as a result of repeated research to develop a polyurethane composition containing a flame retardant with a large flame retardant effect and less adverse effects on physical properties, the inventor discovered that the reaction between acidic phosphate ester and metal hydroxide The present invention has been achieved by discovering that a polyurethane composition containing the above-mentioned substances can achieve the intended purpose.

The acidic phosphorus esters that are the raw materials for the #IA punitive agent in the present invention include mono- or dibutyl esters, mono- or dibutoxyethyl esters, and mono- or di-butoxyethyl esters of hostile phosphoric acid.
-ethylhexyl ester, mono- or dibutoxyethyl ester, mono- or dibutyl ester, and the like. In addition, aluminum hydroxide, magnesium hydroxide, etc. can be mentioned as the hydroxide, and the former is particularly preferable.
Usually, the ratio of phosphate group/hydrogen group is [101 to 1].
5 Preferably (in the ratio of 102 to 11 in the inert wire, 50 to 111 depending on the l1111111 of the inert wire used)
After stirring at 150C for 1 minute to 3 hours, the medium is filtered and the residue removed by evaporation is dried. However, it is also possible to use a polyol, which is a raw material for polyurethane, instead of the above-mentioned inert wire, and to use this as it is for the production of polyurethane (mg product). In this case, water is produced by the condensation reaction between the polyol and the acidic phosphoric acid ester, but it is not necessary to remove the water to % unless there is any problem in subsequent processing as in the production of polyurethane foam. Incidentally, if the ratio of the acidic phosphorus ester and the hydroxide is out of the above range, the flammability and physical properties will be poor.

The polyurethane in the present invention is prepared in accordance with a conventional method, and examples of the polyisocyanate include tolylene diisocyanate, methylene bis(4-phenyl isocyanate), phenylene diisocyanate, naphthalene diisocyanate, and diphenyl ether diisocyanate. Examples of polyols include polyester-based polyols, polyether-based polyols, and castor thread-based polyols having OH at the molecular end. In addition, the polyurethane in the present invention is defined to include those having an isocyanurate ring in the polymer chain.

The amount of the reaction product of the hostile phosphoric acid ester and the metal hydroxide used is 5 to 200 parts by weight per 100 parts by weight of polyusotuff. Hardening agent, filler, Toyoko agent, 1 as required*
A composite material, a foaming agent, etc. can be used as appropriate.

Next, the present invention will be specifically explained with reference to Examples.

Reference Example: Into a Separate flask with an embossed plate (No. 11) containing 400 g of toluene, hostile phosphoric butyl (mixture of motuptyl/dibutyl weight ratio of 62/38) and aluminum hydroxide were added in amounts indicated by *IK, and heated at 150C. Water of condensation 4 was removed without causing any reaction. After the reaction was carried out for 15 hours, the reaction product was separated by filtration and dried to prepare a sample.

Table 1 Using the samples produced in Examples and Reference Examples, polyurethane compositions having the formulations shown in Table 2 (compounding parts and numbers are based on coulometric) were prepared.
After curing with C, oxygen index (K-7201 from J)
and tensile strength of 514 degrees (use of J Engineering No. 81 dumbbell piece, tensile shielding rate of 501/min, 25C). The results are shown in Table 2.

Table 2 shows that the polyurethane composition of the present invention provides a cured product with excellent J11 flammability and tensile strength.

Claims (1)

[Scope of Claims] A polyurethane composition comprising a polyurethane and a reaction product of an acidic phosphoric acid ester and a metal hydroxide.