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JP-7855048-B2 - Flame-retardant urethane resin composition

JP7855048B2JP 7855048 B2JP7855048 B2JP 7855048B2JP-7855048-B2

Inventors

  • 玉井 裕介
  • 梶田 倫生
  • 田中 康揮

Assignees

  • 積水化学工業株式会社

Dates

Publication Date
20260507
Application Date
20241025

Claims (8)

  1. A flame-retardant urethane resin composition for spraying, comprising a polyol composition containing a polyol compound, a filler, a liquid flame retardant, a catalyst, and a blowing agent, and a polyisocyanate composition containing a polyisocyanate compound, The polyol compound includes a polyester polyol having an aromatic ring, The filler contains red phosphorus, The liquid flame retardant includes a phosphate ester-based flame retardant. The catalyst includes a urethane catalyst and a trimerizing catalyst. The urethane catalyst comprises one or more metal-based urethane catalysts selected from bismuth compounds and tin compounds, and an imidazole compound. The trimerizing catalyst comprises one or more selected from the group consisting of alkali metal carboxylic acid salts and quaternary ammonium carboxylic acid salts. The blowing agent comprises a hydrofluoroolefin, A flame-retardant urethane resin composition for spraying, which does not contain a foam stabilizer and has a gel time of 20 seconds or less, and is used to form thermal insulation material by spraying it onto the surface of a structure using a spraying device and spray gun.
  2. A flame-retardant urethane resin composition for spraying onto the surface of a structure to form an insulating material, using the spraying apparatus and spray gun described in claim 1, wherein the cream time is 8 seconds or less.
  3. A flame-retardant urethane resin composition for spraying onto the surface of a structure to form an insulating material, using the spraying apparatus and spray gun according to claim 1 or 2, wherein the filler content is 10 to 80 parts by mass per 100 parts by mass of the polyol compound.
  4. A flame-retardant urethane resin composition for spraying, used to form a heat-insulating material by spraying it onto the surface of a structure using a spraying apparatus and spray gun according to any one of claims 1 to 3, wherein the liquid flame retardant content is 20 parts by mass or more per 100 parts by mass of the polyol compound.
  5. A flame-retardant urethane resin composition for spraying onto the surface of a structure to form an insulating material, using a spraying apparatus and spray gun according to any one of claims 1 to 4, wherein the foaming agent contains hydrofluoroolefin and water, the hydrofluoroolefin content is 3 to 60 parts by mass per 100 parts by mass of the polyol compound, and the water content is 0.05 to 10 parts by mass per 100 parts by mass of the polyol compound.
  6. A flame-retardant urethane resin composition for spraying onto the surface of a structure to form an insulating material, using a spraying apparatus and spray gun according to any one of claims 1 to 5, wherein the trimerizing catalyst contains an alkali metal carboxylic acid salt and a quaternary ammonium carboxylic acid salt.
  7. A flame-retardant urethane resin composition for spraying onto the surface of a structure to form an insulating material, using a spraying apparatus and spray gun according to any one of claims 1 to 6, wherein the content of the trimerizing catalyst is 1 to 30 parts by mass per 100 parts by mass of the polyol compound, and the content of the urethane catalyst is 1 to 30 parts by mass per 100 parts by mass of the polyol compound.
  8. A polyurethane foam formed from a flame-retardant urethane resin composition for spraying, used to form an insulating material by spraying it onto the surface of a structure using the spraying apparatus and spray gun described in any one of claims 1 to 7.

Description

This invention relates to a flame-retardant urethane resin composition. Polyurethane foam is used in practical applications for insulation and condensation prevention in various structural elements of buildings such as apartment buildings, detached houses, and commercial buildings, taking advantage of its excellent thermal insulation properties. Polyurethane foam is formed, for example, by spraying a urethane resin composition containing a polyol composition and a polyisocyanate composition onto the surface of each structure, followed by foaming and curing. For example, Patent Document 1 describes an invention relating to a spray-on insulation material made of rigid polyurethane foam obtained by foaming a compound liquid containing a polyisocyanate component, a polyol component, water, a catalyst, a foam stabilizer, a flame retardant, and a powder. It is shown that this spray-on insulation material exhibits excellent flame retardancy and dimensional stability. Japanese Patent Publication No. 2010-270877 The present invention relates to a flame-retardant urethane resin composition containing a polyol composition comprising a polyol compound, a liquid flame retardant, a catalyst, and a blowing agent, and a polyisocyanate composition comprising a polyisocyanate compound, wherein the composition does not contain a foam stabilizer and has a gel time of 20 seconds or less. (Foam stabilizer) The flame-retardant urethane resin composition of the present invention does not contain a foam stabilizer. By not containing a foam stabilizer, it is possible to suppress the bleed-out of the foam stabilizer onto the surface of the polyurethane foam formed when, for example, a silicone-based foam stabilizer is used. Furthermore, by removing the foam stabilizer component, which can be a flammable element, it is possible to prevent the polyurethane foam from becoming easily combustible. Here, "foam stabilizer" refers to a substance that has a foam-stabilizing function in polyurethane foaming, and is generally used in the manufacture of polyurethane foams. Examples of foam stabilizers include silicone-based foam stabilizers and non-silicone-based foam stabilizers. Silicone-based foam stabilizers are compounds having polysiloxane chains and polyoxyalkylene chains, and may have a block-type structure of polysiloxane chains and polyoxyalkylene chains, or a structure in which polyoxyalkylene chains are grafted as side chains onto a main chain of polysiloxane chains. Specific product names of such silicone-based foam stabilizers include, for example, SH-193, SF-2937F, and SF-2945F manufactured by Toray Dow Corning. Non-silicone foam stabilizers refer to foam stabilizers other than silicone foam stabilizers, such as acrylic surfactants. Examples of acrylic surfactants include acrylic polymers having polar groups in their side chains. (Geltime) The flame-retardant urethane resin composition of the present invention has a gel time of 20 seconds or less. If the gel time exceeds 20 seconds, the balance between the urethane resin formation rate and the foaming force is disrupted, causing the cells in the polyurethane foam to partially crack and become rough, which tends to reduce the heat insulation properties. From the viewpoint of improving the thermal insulation properties of the formed polyurethane foam, the gel time of the flame-retardant urethane resin composition is preferably 16 seconds or less, more preferably 14 seconds or less, even more preferably 12 seconds or less, and even more preferably 10 seconds or less. The gel time can be adjusted to a desired value by controlling the type and amount of catalyst contained in the polyol composition. The gel time is measured using the cup foaming method. Specifically, it is measured as follows: The liquid temperatures of the polyol composition and polyisocyanate composition constituting the flame-retardant urethane resin composition of the present invention are each adjusted to 10°C. Then, in a room at 23°C, the polyol composition and polyisocyanate composition adjusted to 10°C are poured into a 500 mL cup in a predetermined mixing ratio to obtain a mixture of 60 g in total. Immediately thereafter, the mixture is stirred for 2 seconds at 8000 rpm using a Labodisper (PRIMIX high-speed disperser, Homodisper 2.5 type). The time at which stirring begins is taken as the measurement start time (0 seconds), and the time (in seconds) until the foam begins to string when a rod is inserted into the foam during foaming is measured and defined as the gel time. In addition, if a trimerizing catalyst is included, the stringing of the foam and internal hardening of the foam may occur almost simultaneously. The predetermined mixing ratio mentioned above refers to the mixing ratio of the polyol composition and the polyisocyanate composition when preparing the flame-retardant urethane resin composition of the present invention. (Cream Time) The flame-retardant urethane resin composition of the present inv