Coating Knowledge: Construction Requirements for Polyurethane Rigid Foam Spraying
Release time:
2013-01-31
Huicong Surface Treatment Network: 1. Ambient Temperature Requirements: The optimal temperature range for spray foaming is 15–35°C. If the temperature is too low, the foam plastic is prone to peeling off the surface of the object, its density will significantly increase, and material consumption will rise markedly. Conversely, when the ambient temperature is too high, the foaming agent will be excessively consumed. 2. Moisture: Isocyanates readily react with water to form brittle urea-containing substances. The surface to be coated must be free of dew or frost. When the air humidity is too high, dehumidification is necessary; otherwise, the adhesion between the foam plastic and the object will be affected, making it easy to detach. 3. Wind: When spraying outdoors, at a wind speed of 5 m/s, heat...
Huicong Surface Treatment Network: 1. Environmental Temperature Requirements
The optimal temperature for spray foaming is between 15°C and 35°C. If the temperature is too low, the foam plastic tends to peel off the surface of the object, its density significantly increases, and material consumption rises markedly. Conversely, when the ambient temperature is high, the foaming agent suffers excessive loss.
2. Moisture
Isocyanates readily react with water to form brittle urea-containing substances. The surface to be coated must be free of dew or frost. When the air humidity is too high, dehumidification is necessary; otherwise, the adhesion between the foam plastic and the object will be compromised, making it prone to detachment.
3. Wind
When spraying outdoors, at a wind speed of 5 m/s, heat loss is excessive, making it difficult to produce high-quality foam plastic and resulting in significant raw material waste, while also causing noticeable environmental pollution.
4. Sprayed surface
The surface to be coated must be free of rust, dust, oil stains, and moisture. If necessary, it should be treated to meet the requirements for construction.
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