What Are Adhesives for Urethane?
Adhesives for urethane are suitable for bonding urethane rubber used for shoe soles and urethane foam, often used for sound absorption and thermal insulation.
Although the name “adhesives for urethane” is not often used, silicone resin adhesives and urethane adhesives are used to bond urethane rubber such as shoe soles. SBR (styrene-butadiene rubber) adhesives and chloroprene rubber solvent-based adhesives are also used for bonding urethane foam.
Uses of Adhesives for Urethanes
Adhesives for urethane are used to bond urethane rubber, urethane foam, and other materials. Urethane rubber is used in a very wide range of fields, including familiar shoe soles, casters, industrial rollers, shock absorbers, and forklift tires.
Adhesives for urethane suitable for urethane rubber are used as needed during the manufacture or repair of these products. The fields in which urethane foam is used are also very wide, including building materials such as sound absorbers and heat insulators, as well as cushioning materials such as bedding and household products such as kitchen cleaners.
Adhesives for urethane foam are also used as needed in the manufacture and repair of these products, as well as in the adhesive process during construction.
Features of Adhesives for Urethane
Adhesives for urethane include modified silicone resin adhesives and silylated urethane resin adhesives suitable for urethane rubber, SBR adhesives suitable for urethane foam, and chloroprene rubber solvent adhesives.
1. Modified Silicone Resin Adhesive
Modified silicone resin adhesives are reaction curing type adhesives that are mainly composed of modified silicone polymers and are cured by moisture in the air and catalysts. In addition to bonding urethane rubber, they are often used as sealants.
Most modified silicone adhesives suitable for bonding urethane rubber are one-component types, but two-component types are also available. One-component types cure through a condensation reaction with moisture in the air, which generates alcohol and other by-products during curing, while two-component types cure through an addition reaction, which generates no by-products.
2. Silylated Urethane Resin-Based Adhesive
Silylated urethane resin-based adhesives are typical among urethane resin-based adhesives and reacts to moisture in the air or on the bonding surface to cure. In addition to having strong adhesive strength, they are highly shock absorbent as they become elastic and rubbery after curing. Silylated urethane resin-based adhesives have high water and heat resistance and are used as sealants for indoor, outdoor, uneven surfaces, and around water.
3. SBR-Based Adhesives, Chloroprene Rubber Solvent-Based Adhesives
The main component is a polymer elastomer such as SBR (styrene-butadiene rubber) and chloroprene rubber, which is an adhesive dissolved in an organic solvent.
Other Information on Adhesives for Urethane
1. When Bonding Urethane to Metal
Urethane adhesives and modified silicone adhesives are suitable for bonding urethane resins and metals. Since these adhesives are suited for bonding rubber and materials of different materials, they are also very effective for bonding urethane resins and metals.
There are three tips for using adhesives in this way: first, clean the metal or rubber surface so that it will not repel the adhesive; second, apply the adhesive thinly and evenly to eliminate unevenness in application. The third tip is to allow the adhesive to stand still long enough after bonding to harden. The above tips will improve the adhesive strength.
2. General Urethane Adhesives
Common urethane adhesives come in one-component and two-component mixed types. Urethane adhesives are more flexible and impact-resistant than other reactive adhesives, such as epoxies and acrylics.
They cannot be wiped off after curing, so wiping should be done quickly before curing. In addition, it is recommended to ventilate well and wear safety glasses, masks, and gloves, as it may cause irritation to the eyes and nose during use.
Among urethane adhesives, one-component types are relatively weak in strength, while two-component types tend to have stronger adhesion, longer life, and higher heat and weather resistance. For this reason, the two-component type can be used in a wider range of locations.