Microwave drying on the advantages of water-based coatings
Water-based coatings and traditional solvent-based coatings is the biggest difference lies in different diluents used . Solvent coatings using more volatile organic solvents, water-based coatings are water as a diluent , water-based coatings therefore more vulnerable to dry ambient temperature and humidity. In order to avoid different regions, different seasonal temperature and humidity.
Microwave drying equipment drying water-based coatings on the advantages of microwave drying for single- and two-component waterborne wood coatings performance and film composition. Water-based coatings due to the use of water as a dispersion medium , making it dry than solvent-based coatings are more susceptible to temperature and humidity. When faced with cold or wet weather , construction workers paint is commonly used hot air drying and infrared heat drying , but the two forced drying methods for water-based coatings , there are certain drawbacks.
Characterized by hot-air drying equipment investment is relatively simple, but that of the substrate and heating the wet film is slow, the drying process which extends the time required ; and construction conditions and changes in environmental factors can lead to the drying effect changes, such as thickness of the coating , the air humidity and air temperature. Infrared heating and drying can be shortened compared to air -drying the drying process ; but it will have a significant temperature gradient , and its drying is extending to the inside surface , which makes it unsuitable for drying a thick film ; infrared drying infrared heating can be irradiated only on the area of ​​the three-dimensional object can not be used to dry , and infrared drying for greater energy consumption .
Two-component polyurethane waterborne wood coatings dry in two major phases:
The first phase is water and a small amount of volatile coalescent ;
The second stage is the resin and hardener chemistry.
If the drying conditions are not conducive to the rapid evaporation of water will result in a lot of water with the polyisocyanate competing reaction , so that bubbles are generated in the coating film . Also reduces the generation of CO2 pH of the system , leading to contraction of aggregated particles , if the volatiles were distilled out of the top there are too many responses , the dispersed particles may occur incomplete coalescence . Accompanied by a crosslinking reaction, and the molecular weight increasing, the viscosity at elevated , then the resulting foam is very Away addition , the affect the final appearance of the coating .
Microwave drying with environmental protection, high efficiency, energy-saving features . For single- or two-component polyurethane waterborne wood coatings , can significantly accelerate the evaporation of water , thus avoiding the different climates , different air humidity on the construction of water-based coatings polyurethane impact . For a single- component polyurethane waterborne wood coatings , microwave drying of the coating after grinding and packing can be immediately processed , each process can dramatically reduce the time required , which greatly improves the efficiency of production . Microwave drying two-component polyurethane coating water-based coatings can reduce dry time , improve the coating hardness, solvent resistance of the coating less demanding circumstances reduce the amount of curing agent used to achieve high hardness , which can reduce costs.

 

●微波加热原理       http://www.weiboshebei.cn/yingyong-neiye-17.html

 

●微波杀菌原理       http://www.weiboshebei.cn/yingyong-neiye-18.html

 

●微波设备定做流程   http://www.weiboshebei.cn/yingyong-neiye-19.html