Bicomponent terminal mercapto polyurethane mildewproof sealant and preparation thereof

Abstract

The invention relates to a dual-component sulfhydryl-terminated polyurethane mildew-proof sealant and a preparation method thereof, wherein, the sealant consists of component A and component B, wherein, according to the parts by weight, the component A comprises 80-120 parts of sulfhydryl-terminated polyurethane liquid rubber, 20-200 parts of filling material, 10-100 parts of plasticizer, 0.5-10 parts of tackifier, 0.1-5 parts of mould inhibitor, 0-5 parts of vulcanization regulator, and 0-5 parts of antioxidant; the component B comprises 80-120 parts of vulcanizing agent, 20-150 parts of plasticizer, 20-200 parts of filling material, and 0-5 parts of vulcanization regulator; and the proportion of component A and component B is 10:0.5-2. The mildew-proof sealant has the tensile strength of 5.0MPa, breaking elongation rate of 1020 percent, the bonding strength with the concrete of 2.5MPa, and the mildew-proof level of being less than or equal to 1; the sealant can be used for the fields such as electrons, mechanicals, and the like, can meet the sealing and mildew-proof requirement under the conditions of long-term water immersion, damp-heat or other conditions where mildews are easy to breed, has no exhaust of three wastes and is friendly to environment.

Description

1. Technical Field: [0001] The invention relates to a sealing material, in particular to a two-component mercapto-terminated polyurethane anti-mold sealant and a preparation method thereof. 2. Background technology: [0002] Sealant is the abbreviation of sealing adhesive, and it is a multi-purpose functional material with both bonding and sealing properties. It can not only prevent internal gas or liquid leakage, but also prevent the intrusion of external dust, moisture, moisture, dirt and chemicals, and can prevent mechanical vibration, impact damage or achieve the effect of sound insulation and heat insulation. The sealant can deform with the shape of the sealing surface, is not easy to flow, and has a certain degree of adhesion. It is widely used in the sealing of civil engineering, electronic appliances, mechanical equipment, transportation equipment and other fields. Sealant is an indispensable and important material for solving running, emitting, dripping and leakage, and ...

AI Technical Summary

Problems solved by technology

At present, most of the research on anti-mold of sealants is concentrated in the fields of aircraft, ships, electronics, machinery, etc., but it is easy to breed mold when used in water conservancy projects, water delivery projects, sewage treatment projects, etc. Anti-mildew sealant products that require extremely high sealing effects are rarely reported

If the sealant used in these fields does not have anti-mold function, it is easy to breed mold, and the growth and spread of mold will erode the internal molecular structure of the sealant, cause degradation and deterioration, affect or even lose the sealing effect