Construction of low temperature in winter What is the impact on the paint?
The paint we use is composed of a variety of chemical materials, the low temperatures in winter and chemical properties of the materials will be some changes, so to paint an adverse impact of the construction.
Temperature of the paint film and dry. When the paint coating to the furniture surface coating, the resin film in the cross-linking reaction will occur, low temperature makes the molecular activity decreased energy, slow the rate of crosslinking reaction; coating in the solvent evaporation requires a certain energy, low-temperature solvent evaporation also slow, these have a direct relationship with the temperature.
For lacquers, in the winter to pay attention to the control of air humidity, humidity is an important factor in the construction of lacquer, moisture in the air film in the inhibition of the volatile solvents, in addition to the volatile solvent will bring the heat to the film the film surface temperature decreases, the film surface temperature will be lower than the surrounding temperature, after heating the indoor temperature difference between the relatively large, it is likely to cause condensation of water vapor in the air leaving the paint film on the whitening.
Winter and summer use paint paint What is the difference?
The same type of paint winter and summer, some differences in the ratio slightly, paint finishing plant in order to facilitate the construction and improve the film quality, according to the actual use of the ratio of the temperature, etc. to make some minor adjustments. We currently use the main points of resin paint and solvent, the main agent for the resin, is generally not adjusted to the solvent (water that day) depending on the circumstances, the ratio of the material components and materials, paint manufacturers often have to make some adjustments, enabling users to use more convenient, better quality film.
Construction of the winter finishing paint what measures can be taken to improve efficiency, protect product quality?
The speed of drying paint, the type of paint, coating composition, coating thickness, drying temperature and humidity of the environment and other factors. Improve the paint shop and dry place finish temperature of the paint coating is to improve the efficiency of construction in winter the best measures. Generally use steam, hot water, gas and other heat source heating the air, then fan the hot air into the shop and dry place finish, while a part with the ventilation equipment, air pollution exclusion. Into the fresh air and remove air pollution to achieve the dynamic balance between the two in order to ensure coating, drying and air temperature required cleanliness.
Winter paint finishing long construction period, mainly because of long drying cycle. Drying temperature and drying time is almost inversely proportional, with the temperature increase will reduce drying time, the implementation of heating and drying is to increase the speed of paint drying an important way. Currently there are two forms of heating and drying. Called connection type, the other called cycle-type. Continuous line is the dry form, the drying cycle, the workpiece is heated environment in the flow, suitable for continuous large-scale production. Drying cycle, drying room, also known as dry, after finishing the product into the temperature-controlled dry place (drying room, drying room), this approach is more appropriate small-scale production.
Finishing construction of the workshop to the ideal temperature of 20-30 ℃. Continuous drying paint performance settings based on different periods of drying temperature, and temperature control section. Drying in the drying room lacquer finish of the workpiece, the initial stages of drying temperature at 25 ℃ for 10 minutes, then slowly heated to 30-40 ℃ heat 15-25 minutes, then slowly down to room temperature. Relative humidity control drying lacquer requires 70% or less, humidity control is essential for drying lacquers. Polyurethane coating with paint drying room drying the workpiece, the first in the drying temperature 20-30 ℃ for 20 minutes or so, and then slowly heated to 32-38 ℃ to maintain 70-100 minutes, let the temperature slowly to room temperature.
In the case of heating and drying the paint, the construction of a coating film should not be too thick, because the film after heating, the rapid evaporation of the solvent coating so the coating viscosity, coating the surface close to the dry, deep coating solvent evaporation difficult, volatile solvent which is inevitable if the depths of the bubbles. Therefore, the gradual warming heating and drying the best, just a good job finishing first place at room temperature for some time, so that part of solvent evaporation, creating a gradual drying of the environment outside to the inside.
Film quality and finishing construction of the environment, dry environment, the construction workshop and drying room air cleanliness are closely related, these will directly affect the quality of the film. Good construction and renovation dry conditions, keep the air clean is a basic requirement to improve the quality of finishing.