As the temperature gradually decreases, many people find that some of the styrofoam they bought"Problems", such as slow curing, surface powdering after curing, etc. In fact, these are not styrofoam quality problems, but the temperature is too low, styrofoam is also afraid of cold.

1. Slow curing and low cell compactness

The use temperature of the case urethane foam caulking agent is5-35 ℃, the best use temperature is 21-25 ℃, the phenomenon of slow foaming and curing will occur in severe cold and low temperature environment, and the phenomenon of slow foaming and low cell density will also occur in the dry and low humidity environment.

2. The surface becomes pulverized and brittle

Polyurethane foam caulking agent belongs to polyurethane products, and polyurethane products will have the phenomenon of surface pulverization and embrittlement under low temperature conditions. This phenomenon belongs to the commonality of urethane products and is not a product quality problem. With the passage of time, this powdering phenomenon will gradually disappear until it returns to normal and will not affect the use.

The speed between the state conversion meters is related to the actual temperature of the actual use environment. The higher the temperature, the shorter the time, and the lower the temperature, the longer the time, usually after curing.The normal state can be restored within 48-72 hours. During this period, do not perform nuclear pressure cutting on the surface of the styrofoam, so as not to cause damage to the cell structure and cause the styrofoam to fail to return to the normal state.

3. Foam glue internal hollow

Foam itself has good thermal insulation and waterproof performance, foaming acid skin after curing water vapor is not easy to enter its internal, resulting in internal foam can not get enough water vapor, curing reaction can not be carried out inside the hollow problem. At the same time, the winter climate itself is relatively dry, more period of this problem

4. Glue is not smooth

Under the condition of low temperature in winter, the viscosity of styrofoam material will increase, and the propellant gas in the bottle is not easy to vaporize. If the styrofoam is not fully shaken during the use of the styrofoam, the problems that the styrofoam in the front is diluted, the foaming acid gun in the back is not smooth, or even cannot be beaten out easily.

Solution:

1. Increase air humidity

Foaming adhesive wet curing aerosol products, the use of the degree30%-80%, the best use humidity is 45%-55%, the air is relatively dry in winter, a little water mist can be sprayed in advance during construction to increase the air humidity, so as to avoid problems such as slow curing, low bubble density, hollow inside, etc.

2, the foam for pre-heat treatment.

In winter cold conditions, if the temperature of the polyurethane foam sealant tank is too low or frozen during storage, it should be preheated before use to ensure the normal use of the foam.

Preheating method:

The night before construction, place the foam in the room at constant temperature for one night, and the next day, put it into the heat preservation box and bring it to the construction site for direct construction.: Preheat 5-10mn in warm water at 40-50 ℃, and use it after the internal materials return to normal temperature. It is strictly prohibited to use electric heater, boiling water, fire source and other direct heating to avoid local temperature explosion.

Shake well before use:

Before use, polyurethane foam caulking agent should be fully shaken to ensure uniform mixing of internal materials. Under low temperature conditions in winter, problems such as increased consistency of internal materials and difficulty in gasification of propellant gas will be caused. Before use, officials need to shake well to avoid the problem that styrofoam cannot be used normally.