Polyurethane sealant is generally divided into two basic types: one component polyurethane sealant and two component polyurethane sealant. One component is moisture curing type and two components are reaction curing type. One component sealant is easy to construct, but its curing is slow; The two-component has the characteristics of fast curing and good performance, but it needs to be prepared when used, and the process is complex. Each has its own future. Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china can be divided into non hanging type and self flow parallel type. The non hanging type is used for vertical plane, inclined plane, ceiling and other occasions. It will not shift, slide or flow due to the self weight of the adhesive strip before curing; The self leveling type is specially used for horizontal occasions. According to the properties after use, it can also be divided into non drying type, semi drying type and fully cured elastic type.

Two component aging causes of Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china:

The factors that affect the two-component aging of POLYURETHANE SEALANT FOR GENERAL USE in china, such as sunlight, temperature, humidity, glue joint movement, etc., can affect the use of Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china. There are also some factors that affect the two-component POLYURETHANE SEALANT FOR GENERAL USE through interaction. Generally speaking, the synergistic effect of multiple factors has a greater impact on the aging of the two-component universal polyurethane sealant. Among these factors, periodic joint movement, sunlight, temperature changes (cold, hot) and humidity are considered to be the main environmental factors and aging factors for the two-component POLYURETHANE SEALANT FOR GENERAL USE failure. However, The natural aging time of two components of Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china is relatively long, and it takes several years or even decades to get the data.

3. two component construction steps of Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china:

Step 1: treatment of the sealed surface:

Before construction, the residual garbage and sundries after the previous construction shall be cleaned, and then the floating ash shall be treated with a blower or vacuum cleaner. If the base surface is wet, it shall be dried with a blowtorch and brushed with a steel wire brush to remove the cement chips and dust after baking. Remove the greasy dirt, plastic attachments, dust and other sundries on the surface to be adhered (polyurethane sealant two-component does not adhere to plastic and greasy dirt, which can be operated with portable cutting machine, grinding wheel, steel brush and other tools), blow the sundries with a blower to make the glued surface expose a solid structural layer, and the joint surface is completely dry, clean and frost free. Clean all dust and cement slurry on the surface. The bonded surface shall be dry and flat to prevent poor bonding. The rust layer and protective paint on the metal surface shall also be removed. If the structure is not dry, it can be dried with blowtorch.

Step 2: before construction, 50mm wide protective tape shall be pasted at 10mm on both sides of the gap to prevent the redundant two-component polyurethane sealant from fouling the surface of the structure during construction.

Step 3: fill the backing material:

According to the design requirements, the backing material is filled into the joint. Generally, the foam plate is required to be filled in the design. This joint plate is produced by our factory and is specially used together with the two-component polyurethane sealant.

Step 4: apply primer:

For projects requiring primer or sealing of long-term water immersion parts, the primer shall be painted on the surface to be adhered and dried to form a film (primer shall be provided separately).

Step 5: preparation of two components of Wholesale POLYURETHANE SEALANT FOR GENERAL USE in china:

Fully mix 1 barrel of white POLYURETHANE SEALANT FOR GENERAL USE in china(component a) and 1 bag of black curing agent (component B) in the box until they are even.