KR100348519B1 - Flameretardant Polyurethane Foam and Polyol Composition for Preparing the Foam - Google Patents

Abstract

The polyol composition of the present invention is used to prepare a flame-retardant polyurethane foam, to control the reaction time 100 parts by weight of polyol consisting of 30 to 90 parts by weight of aromatic polyester polyol and 70 to 10 parts by weight of ethylene diamine polyether polyol. 2.0 to 5.0 parts by weight of amine catalyst, 0.5 to 7.0 parts by weight of trimerization catalyst for polyisocyanurate reaction, 1.5 to 2.5 parts by weight foaming agent, 5 to 15 parts by weight of phosphorus flame retardant, 0.3 to 1.5 parts by weight of water, and blowing agent Characterized in that it comprises 25 to 45 parts by weight. The flame-retardant polyurethane foam can be formed by mixing the polyol composition prepared above and the methylene diisocyanate composition in a foaming machine at a capacity ratio of 1: 1 to foam the foamed product.

Description

Flame retardant polyurethane foam and polyol composition for preparing the same {Flameretardant Polyurethane Foam and Polyol Composition for Preparing the Foam}

Field of invention

The present invention relates to a flame retardant polyurethane foam. More specifically, the present invention relates to polyol compositions used to produce flame retardant polyurethane foams which may exhibit flame retardant grades 2 to 3.

Background of the Invention

Polyurethane has been used as a material for insulation construction of various buildings, including refrigerated warehouses, insulated houses, ships. In order to construct polyurethane, methane diisocyanate (MDI) solution and polyol solution are mixed at a constant ratio, and a foamed urethane molding is constructed using a foaming machine. MDI solutions and polyol solutions are manufactured separately, and polyurethane contractors mix these two products to construct polyurethane foams. Therefore, in order to improve the quality and performance of the urethane foam, it is necessary to improve the quality and performance of the polyol solution as well as the MDI solution.

The biggest problem of foams molded from foamed urethane with MDI and polyol solutions that have been used so far is not maintaining sufficient flame retardant ratings. When urethane foam is tested for flame retardancy by KS F2271, flame retardant grades 2 to 3 should be maintained to have a degree of flame retardance to prepare for fire. However, until now, the foamed polyurethane has not reached the level of the flame retardant grades 2 to 3, and as a result, the building constructed with polyurethane always had a large fire factor.

In addition, when molding a conventional polyurethane foam, there is also a disadvantage in that the economic efficiency is poor due to the foaming efficiency is poor in cold weather, such as winter. In order to foam the polyurethane, a blowing agent should be used, and so far, Freon gas (CFC-11) has been used as the blowing agent. Freon gas is one of the substances that can destroy the ozone layer and cause environmental problems, and its use is already legally regulated in developed countries. In the present invention, it was also found that there is no big problem in foaming efficiency even when HCFC-141b, which is a so-called alternative freon gas, is used without using a freon gas as a blowing agent.

The present inventors have developed a polyol composition having a new composition in order to solve the problems of the conventional foaming or foaming as described above, and when forming a polyurethane foam using this polyol composition exhibits a sufficient degree of flame retardant In this case, the foaming efficiency at the time of construction is excellent, and the alternative Freon gas can be used as the foam.

It is an object of the present invention to provide a polyol composition capable of molding polyurethane foams having a flame retardant grade secondary or tertiary level.

Another object of the present invention is to provide a polyol composition which can exhibit high foaming efficiency even in cold weather such as winter season.

Another object of the present invention is to provide a polyol composition for molding a polyurethane foam in which an alternative freon gas can be used as the blowing agent instead of the freon gas.

Another object of the present invention is to provide a polyol composition for molding a polyurethane foam having excellent thermal insulation performance and having good airtightness, self adhesiveness, water resistance and chemical resistance.

Another object of the present invention is to provide a polyurethane foam having a flame retardant grade secondary or tertiary level using the polyol composition of the present invention.

The above and other objects of the present invention can be achieved by the present invention described below.

The polyol composition of the present invention is used to prepare a flame-retardant polyurethane foam, to control the reaction time 100 parts by weight of polyol consisting of 30 to 90 parts by weight of aromatic polyester polyol and 70 to 10 parts by weight of ethylene diamine polyether polyol. 2.0 to 5.0 parts by weight of amine catalyst, 0.5 to 7.0 parts by weight of trimerization catalyst for polyisocyanurate reaction, 1.5 to 2.5 parts by weight foaming agent, 5 to 15 parts by weight of phosphorus flame retardant, 0.3 to 1.5 parts by weight of water, and blowing agent Characterized in that it comprises 25 to 45 parts by weight.

The flame-retardant polyurethane foam can be formed by mixing the polyol composition prepared above and the methylene diisocyanate composition in a foaming machine at a capacity ratio of 1: 1 to foam the foamed product.

To provide a polyol composition according to the present invention, 30 to 90 parts by weight of an aromatic polyester polyol and 70 to 10 parts by weight of an ethylene diamine polyether polyol are mixed. Preferably 60-90 weight part of aromatic polyester polyols and 40-10 weight part of ethylene diamine polyether polyols are mixed.

To control the reaction time, an amine catalyst is used in an amount of 2.0 to 5.0 parts by weight based on 100 parts by weight of the polyol.

For the polyisocyanurate reaction, trimerization catalyst is used in an amount of 0.5 to 7.0 parts by weight based on 100 parts by weight of the polyol. The trimerization catalyst is a potassium or ammonium catalyst (DABCO TMR, DABCO TMR-2, DABCO TMR-3, DABCO TMR-4, DABCO K-15, DABCO T-45, POLYCAT) 46 and the like.

In the present invention, 1.5 to 2.5 parts by weight of foam stabilizer, 5 to 15 parts by weight of phosphorus flame retardant, and 0.3 to 1.5 parts by weight of water are added to 100 parts by weight of the polyol. The foam stabilizer may be preferably B8404 of Goldschmidt, Germany, which is mainly composed of silicone, and tris chloro-isopropyl phosphate (TCPP) is used as the phosphorus flame retardant.

In the present invention, the blowing agent is used in an amount of 25 to 45 parts by weight based on 100 parts by weight of the polyol. Blowing agents that can be used include CFC-11, HCFC-22, HCFC-141b, HFC-134a, HFC-365mfc, HFC-245fa and the like. In particular, environmentally friendly products can be manufactured by using alternative freon gases such as HCFC-141b.

A mixture of the polyol composition of the present invention and the existing MDI solution is molded using a foaming machine. MDI solution is a commercially available product which has a dark blackish brown color, a stock solution specific gravity of 1.23-1.25 (20 占 폚), and a stock solution viscosity of 80-200 cps (20 占 폚). The polyol solution prepared in the present invention is light blackish brown, the stock solution specific gravity is 1.14 (20 ℃), the stock viscosity is 60 ± 20 cps (20 ℃).

In the case of free foaming by mixing the polyol solution and the MDI solution, the CT (Cream Time) is 1 to 3 seconds and the RT (Rise Time) is 7 to 11 seconds. The free foam density of the foam can vary depending on the use of the product and is usually molded to have a density of 23, 26, 28, 30, 32, 40, 50 kg / m 3.

The physical properties of the foamed foamed mixture of the polyol composition and the MDI solution of the present invention has a core density of 20-50 kg / m excluding the skin layer, a thermal conductivity of about 0.015 kcal / mh ° C., a compressive strength of about 1.7 kg / cm 2, and a bend. The strength is about 1.8 kg / cm 2 and the absorption is about 1.4 g / 100 cm 2.

Considering that the thermal conductivity of the EPS foam is 0.029 kcal / mh ° C., and the glass fiber has a thermal conductivity of 0.037 kcal / mh ° C., the polyurethane foam of the present invention has excellent thermal insulation performance.

It can be seen that the polyurethane foam of the present invention has excellent self adhesiveness because it has an adhesive force of 2.5 kgf / cm 2 for concrete, 2.0 kgf / cm 2 for steel sheet or zinc, and 1.5 kgf / cm 2 for plywood.

Considering that the EPS foam absorption rate is 2.0 Vol% or less, the polyurethane foam of the present invention has excellent water resistance since it has an absorption rate of 1.8 Vol% or less.

The methylene diisocyanate composition and the polyol composition prepared in the present invention form a flame retardant polyurethane foam by mixing in a foaming machine, usually in a volume ratio of 1: 1, and foaming the foamed foam to form a flame retardant polyurethane foam. For example, the capacity ratio of the methylene diisocyanate composition and the polyol composition prepared in the present invention may vary depending on the kind of the product, and such a change can be easily carried out by those skilled in the art. have. The methylene diisocyanate composition and the polyol composition prepared in the present invention may also be manufactured in the form of building sandwich panels or boards.

The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Example

Examples 1-4

The poly compositions of Examples 1 to 4 were prepared while changing the contents of the aromatic polyester polyol and the ethylene diamine polyether polyol as shown in Table 1. An amine catalyst, trimerization catalyst, foam stabilizer, phosphorus flame retardant, water and blowing agent were added as shown in Table 1. DABCO TMR was used as the trimerization catalyst, B8404 from Goldschmidt was used as the foam stabilizer, and HCFC-141b was used as the blowing agent.

After mixing the MDI solution and the polyol composition using a GUSMER 2000 (R) foaming machine in a 1: 1 capacity ratio in a foaming machine to form a polyurethane foam, core density, CT, RT, and flame retardant performance were measured and the results were measured. Table 2 shows. Flame retardant performance was measured according to KS F2271.

Component (parts by weight) Example 1 Example 2 Example 3 Example 4 Aromatic Polyester Polyols 30 50 70 90 Ethylene Diamine Polyether Polyols 70 50 30 10 Amine catalyst 2 3 4 5 Trimerization catalyst 3 2 One 0.5 Defoamer 2.0 2.0 2.0 2.0 Phosphorus Flame Retardant 10 10 10 10 Water (H ₂ O) 0.5 0.5 0.5 0.5 blowing agent 35 35 35 35

division Example 1 Example 2 Example 3 Example 4 Core density (kg / ㎥) 30.0 30.0 30.0 30.0 CT (Cream Time) (sec) 2 3 3 2 Rise Time (RT) (seconds) 9 12 10 11 Flame retardant performance Flame retardant class 3 Flame retardant class 3 Flame retardant class 2 Flame retardant class 2

The present invention is environmentally friendly by using an alternative freon gas as a blowing agent instead of freon gas, which is excellent in economic efficiency with high foaming efficiency and destroys the ozone layer, and has excellent thermal insulation performance, good airtightness, self adhesiveness, water resistance and chemical resistance. It has the effect of providing a polyol composition for molding a polyurethane foam having a flame retardant grade secondary or tertiary level.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (6)

30 to 90 parts by weight of aromatic polyester polyol and 100 to 100 parts by weight of polyol consisting of 70 to 10 parts by weight of ethylene diamine polyether polyol 2.0 to 5.0 parts by weight of amine catalyst for controlling reaction time, trimerization for polyisocyanurate reaction A flame-retardant polyurethane foam comprising the catalyst comprising 0.5 to 7.0 parts by weight, foam stabilizer 1.5 to 2.5 parts by weight, phosphorus flame retardant 5 to 15 parts by weight, water 0.3 to 1.5 parts by weight, and foaming agent 25 to 45 parts by weight. Polyol composition for The polyol composition for preparing a flame retardant polyurethane foam according to claim 1, wherein the trimerization catalyst for the polyisocyanurate reaction is a potassium or ammonium catalyst. The polyol composition for producing a flame retardant polyurethane foam according to claim 1, wherein the foam stabilizer is mainly composed of silicone. The polyol composition for preparing a flame retardant polyurethane foam according to claim 1, wherein the phosphorus flame retardant is tris chloro-isopropyl phosphate (TCPP). The method of claim 1, wherein the blowing agent is selected from the group consisting of CFC-11, HCFC-22, HCFC-141b, HFC-134a, HFC-365mfc and HFC-245fa Polyol composition. A flame retardant polyurethane foam formed by mixing the polyol composition of claim 1 with a methylene diisocyanate composition and foaming the foamed product.