What to do if polyurethane foam becomes brittle and hollow after curing

What to do if polyurethane foam becomes brittle and hollow after curing

Foam caulking agentcommonly known as foam glue,is a polyurethanethat relies on moisture to cureelastic sealing foam Material. In the usual construction of foam caulking agents, I don’t know if you have encountered this phenomenon. After the foam glue is cured, there will be large cells and it will become brittle. Soft, or producing large bubbles or even cavities? This is related to the foaming principle of styrofoam.

Foam glue Foaming principle: It reacts with water in the air to generate carbon dioxide to foam. . Therefore, the reason for the formation of large bubbles is: the humidity at the construction site is low, resulting in slow reaction. Cutting or pressing the bubbles before the full reaction occurs, resulting in large local bubbles. Solution: 1, if the humidity of the construction environment is lower than 45% , it is recommended to use a watering can to sprinkle water before construction. 2. Control and adjust the soaking time according to the specific situation. It is recommended to wait until the foam reaches a non-sticky state. , wait about two minutes before cutting or soaking.

In fact, you need to wait until the foam is completely foamed before cutting or pressing. Otherwise, the reaction has not been completed or the foaming has not been completed, so proceed to the next step. , this will happen. Apply the solutions mentioned above to solve the problem perfectly.

Weigueach companyModelOne-component polyurethane foam caulking agent (all white products),has high expansion and adhesion, ultra-low thermal conductivity, low water absorption, main insulation, and good waterproof , heat insulation, sound insulation, heat preservation, earthquake resistance and compression resistance and other functions. It has the characteristics of simple operation, fast curing, strong usability, low cost and wide application. This product has fine cells, high closed cell ratio, and good elasticity and toughness. The product will not crack or corrode for a long time after curing, and can be used to fill and bond different materials in various structural parts. Many products with special properties have been developed to adapt to the needs of various construction environments. This product complies with the building materials industry standard:JC936-2004.

Product application:

Door and window installation: caulking, sealing and fixed bonding between doors, windows and walls;

Advertising models: production of models and sand tables, repair of exhibition boards;

Soundproofing and silencing : Filling the gaps during decoration of speech rooms, broadcasting studios, etc., can play a role in sound insulation and silencing;

Gardening Scenery: flower arrangement, gardening and landscaping, light and beautiful;

Daily maintenance: cavities, gaps, wall tiles, floor tiles, Floor repair;

Waterproof and leak-proofing: repair and plugging of leaks in water pipes, sewers, etc..

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