JP-7855303-B2 - Room-temperature curable resin composition with excellent antibacterial properties and its cured product

JP7855303B2JP 7855303 B2JP7855303 B2JP 7855303B2JP-7855303-B2

Inventors

岩崎功
廣神宗直

Assignees

信越化学工業株式会社

Dates

Publication Date: 20260508
Application Date: 20220902

Claims (3)

(A) Organic resin polymer having at least one reactive silyl group in one molecule and a viscosity of 10 to 10,000,000 mPa·s at 23°C: 100 parts by mass, (B) A quaternary ammonium salt silane represented by the following general formula (1): 0.01 to 5 parts by mass, (In the formula, R1 and R2 are each independently an alkyl group having 1 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, R3 is an alkyl group having 12 to 24 carbon atoms, R4 and R5 are each independently an alkyl group having 1 to 6 carbon atoms, X is a halogen atom, m is an integer from 8 to 20, and n is an integer from 1 to 3.) (C) Inorganic filler: 1 to 300 parts by mass, and (D) Hydrolyzable organosilane compound having at least 3 hydrolyzable groups in one molecule and/or a partially hydrolyzed condensate thereof: 1 to 30 parts by mass. A room-temperature curable resin composition for construction, civil engineering, and electrical/electronic applications, comprising the above.
The room-temperature curable resin composition according to claim 1, wherein component (A) is at least one selected from linear diorganopolysiloxanes represented by the following general formulas (2-1) and (2-2). (In the formula, R6 is the same or different unsubstituted or substituted monovalent hydrocarbon group, and p is a number of 10 or more. R7 is the same or different unsubstituted or substituted monovalent hydrocarbon group having 1 to 6 carbon atoms, Y is an oxygen atom or an unsubstituted or substituted divalent hydrocarbon group having 1 to 6 carbon atoms, and q is an integer from 1 to 3.)
A cured product of the room-temperature curable resin composition according to claim 1 or 2.

Description

This invention relates to a room-temperature curable resin composition with excellent antibacterial properties and its cured product. Room-temperature curable resin compositions, which are liquid or paste-like in nature, filled and sealed in moisture-proof packaging containers for storage, are dispensed from the container when needed, and harden upon reaction with moisture in the atmosphere, becoming a rubbery elastic material after hardening. These compositions are widely used as sealants and coatings in industrial applications such as construction, civil engineering, and electrical/electronics, as well as in general consumer applications such as DIY projects. Suitable room-temperature curable resin compositions include those primarily composed of polyorganosiloxanes (room-temperature curable silicone rubber compositions, room-temperature curable silicone gel compositions, etc.), those primarily composed of polyoxyalkylenes (room-temperature curable modified silicone resin compositions, such as room-temperature curable polyether resin compositions), those primarily composed of acrylic polymers (room-temperature curable silylated acrylate resin compositions), and those primarily composed of polyisobutylenes (room-temperature curable polyisobutylene resin compositions). Various organic resin polymers having at least one reactive silyl group in the molecule as a crosslinking site are preferably used. Room-temperature curable resin compositions used as sealing and coating materials for construction and civil engineering are prone to mold and fungi growth on the cured surface (cured surface) depending on the usage environment. Therefore, it has long been common practice to impart antifungal and antibacterial properties to these compositions, and the most common method is to incorporate antifungal and antibacterial agents into the room-temperature curable resin composition. Regarding the imparting of antifungal properties, benzimidazole compounds such as carbendazim, triazole compounds such as tebuconazole and propiconazole, and isothiazolinone compounds such as octylisothiazolinone have been used for a long time. Although the amount added is limited to very small amounts to prioritize safety and suppression of yellowing, even a weak antifungal effect with limited amounts is still suitable for use. This is because areas prone to mold growth are typically exposed to rain, such as exterior walls outdoors, and areas with water, such as kitchens, bathrooms, and washrooms, indoors. Since these areas are easy to clean, even if the antifungal agent isn't very strong, regular cleaning and ventilation can effectively suppress mold growth and proliferation. On the other hand, in recent years, due to the problem of food poisoning caused by pathogenic E. coli O157 and the increasing demand for antibacterial flooring, sanitary ware, and other antibacterial products, antibacterial properties are also becoming necessary for sealants and coatings used around these materials. However, conventional sealants, whose primary purpose is mold resistance, do not consider antibacterial properties, so sealants with antibacterial properties in addition to mold resistance are needed. Antibacterial agents used to impart antibacterial properties can be broadly divided into two types: organic and inorganic. Organic agents have a fast-acting bactericidal effect and strong antibacterial effect, but they are sensitive to heat, have a short duration of effect, and are also harmful to the human body, so they require careful use. Among organic agents, those derived from natural products are generally safer, but their duration of effect is insufficient, and the combinations that are compatible with the polymers they are blended with are limited. Inorganic agents are typically silver, copper, and zinc-based, and their antibacterial effect is brought about by ions generated by the metals. Inorganic agents use metal ions supported on zeolites or clay minerals. While highly heat-resistant and long-lasting, this antibacterial agent exhibits strong discoloration due to its tendency to form complexes with various organic compounds from the environment. Therefore, in applications where the aesthetic appearance of the cured surface is important, the amount added must be kept to a minimum. Furthermore, in the case of thick antibacterial products, only the antibacterial agent present on the surface contributes to the antibacterial effect; most of the expensive antibacterial agent remains internally, resulting in waste and economic disadvantage. According to Patent Document 1, a silicone-based sealant has been proposed that offers excellent mold and antibacterial properties, superior safety and weather resistance, no discoloration, and maintains high mold and antibacterial properties even when used in wet areas. However, the inclusion of the essential component, disodium octaborate tetrahydrate, impairs the stability of the hydrolyzable silane, raising concerns