JP-7857075-B2 - Polyol liquid for filling, polyurethane composition for filling, and polyurethane foam

Inventors

• 小原 峻士
• 荻野 敦史

Assignees

• 積水化学工業株式会社

Dates

Publication Date

20260512

Application Date

20200730

Claims (7)

1. It contains a polyol, a catalyst, a blowing agent, and a filler, wherein the catalyst content is 0.3 to 5% by mass. The polyol includes a polyester polyol, The catalyst comprises a resinification catalyst and a trimerization catalyst, wherein the resinification catalyst content is 0.1 to 4% by mass, and the trimerization catalyst content is 0.05 to 2% by mass. The blowing agent contains a hydrofluoroolefin, and the amount of the blowing agent is 5 to 80 parts by mass per 100 parts by mass of the polyol. The content of the filler is 10 to 300 parts by mass per 100 parts by mass of the polyol. A polyol liquid agent for forming polyurethane foam having a viscosity of 2000 mPa·s or less at 25°C, A polyisocyanate solution is included, The aforementioned polyisocyanate liquid preparation consists solely of polyisocyanate. A polyurethane foam-forming polyurethane composition for filling cavities in a structure, wherein the polyol liquid and polyisocyanate liquid are mixed in a foaming apparatus equipped with a spray gun.
2. The polyurethane composition for forming polyurethane foam according to claim 1, wherein the filler contains a solid flame retardant.
3. The polyurethane foam forming polyurethane composition according to claim 1 or 2, wherein the polyol liquid agent for forming polyurethane foam further contains a foam stabilizer.
4. The polyurethane foam forming polyurethane composition according to any one of claims 1 to 3, wherein the polyol liquid agent for forming polyurethane foam further contains a sedimentation inhibitor.
5. A polyurethane composition for forming polyurethane foam according to any one of claims 1 to 4, wherein the isocyanate index is 200 to 600.
6. A polyurethane composition for forming polyurethane foam according to any one of claims 1 to 5, wherein the gel time at a liquid temperature of 40°C is 4 to 60 seconds.
7. A polyurethane foam filling the cavity of a structure formed from a polyurethane composition for forming polyurethane foam according to any one of claims 1 to 6.

Description

This invention relates to a polyol liquid for filling, a polyurethane composition containing the polyol liquid, and a polyurethane foam formed from the polyurethane composition. Traditionally, polyurethane foam has been used as insulation in vehicles such as automobiles, and in building fixtures. Generally, polyurethane foam is formed by dispensing and mixing a polyol liquid and a polyisocyanate liquid, which are filled in separate containers. It is known that polyol liquids contain fillers such as solid flame retardants to impart flame retardancy to the polyurethane foam formed. For example, Patent Document 1 discloses an invention relating to a polyol composition (polyol liquid) for spray coating, which contains a polyol, a catalyst, a foaming agent, a foam stabilizer, and a flame retardant, wherein the amount of the catalyst is 10 to 56 parts by weight per 100 parts by weight of polyol. Japanese Patent Publication No. 2018-100404 [Polyol liquid for filling] The polyol liquid for filling according to the present invention contains a polyol, a catalyst, and a filler, wherein the catalyst content is 0.3 to 5% by mass. Here, "for filling" means that it is used for filling cavities in a structure, unlike the use in which polyurethane foam is formed on the surface of a structure such as a building fixture by spraying on site. More specifically, it means that it is used for filling cavities inside a finished structure by providing an injection port, or for filling cavities in an unfinished structure during the manufacturing stage as part of the manufacturing process (part of the production line). The cavities in the structure have a certain shape, and when a polyurethane composition containing a polyol liquid and a polyisocyanate liquid is filled into the cavities, the polyol composition is filled along the inner wall of the cavity from near the filling port toward the edge of the cavity, foaming and hardening to form a polyurethane foam that corresponds to the shape of the cavity. The polyol liquid for filling of the present invention has excellent filling properties when filled into cavities in the structure together with the isocyanate liquid, and can form a polyurethane foam with little variation in density depending on the location. The resulting polyurethane foam is a high-quality polyurethane foam in which the urethaneization reaction and trimerization reaction have proceeded sufficiently. [catalyst] The polyol liquid for filling (hereinafter also simply referred to as the polyol liquid) of the present invention contains a catalyst, the catalyst content of which is 0.3 to 5% by mass. If the catalyst content is less than 0.3% by mass, the reaction between the polyol and polyisocyanate will be insufficient, making it difficult to obtain a polyurethane foam with excellent flame retardancy. Furthermore, if the catalyst content exceeds 5% by mass, the reactivity between the polyol and polyisocyanate will be too high, and when filling the cavity of the structure with the polyurethane composition, polyurethane foam will form in a short time near the filling opening, making it difficult to fill the entire cavity of the structure with the composition. In addition, the density of the formed polyurethane foam will vary greatly depending on the location, resulting in non-uniform physical properties. From the viewpoint of forming a polyurethane foam with little variation in density depending on the location and obtaining a high-quality polyurethane foam in which the reaction has proceeded sufficiently, the catalyst content is preferably 0.4 to 3% by mass, and more preferably 0.6 to 2% by mass. The catalyst amounts mentioned above are based on the total amount of the polyol liquid. While catalysts are often sold as products dissolved in a solvent, the catalyst amount in this invention does not include the amount of solvent in which the catalyst is dissolved; it refers to the amount of the catalyst itself (i.e., the solute) dissolved in the solvent. Furthermore, as described later, a polyurethane composition is obtained by mixing a polyol liquid and a polyisocyanate liquid. The amount of catalyst in the polyurethane composition (catalyst amount relative to the total amount of polyurethane composition) is preferably 0.2 to 3% by mass, more preferably 0.3 to 1.5% by mass, and even more preferably 0.4 to 1% by mass. If the catalyst amount is below these upper limits, the polyurethane composition is easily filled into the cavities of the structure, resulting in a polyurethane foam with minimal density differences. If the catalyst amount is above these lower limits, it becomes easier to obtain a high-quality polyurethane foam where the reaction has proceeded sufficiently. Examples of the catalysts mentioned above include resinification catalysts and trimerization catalysts. From the viewpoint of appropriately carrying out the urethane formation and trimerization reactions and obtaining a polyurethane foam with excellent fla