Stream hanging problem and its solution

In coating applications, flow-hanging problems can lead to poor appearance of the coating film, which can affect product quality. This article will explore the causes of streaming and solutions to help address this challenge.

1. Causes of stream suspension
Flow hanging refers to the phenomenon that a part of the film flows down during the construction process, resulting in the film leaving traces on the surface or hanging vertically. Here are some common causes of a stream hang:

a. Paint viscosity reduction: During construction, in order to achieve leveling, it is usually necessary to reduce the viscosity of the paint. However, if the viscosity drops too fast or too much, the paint will flow on the surface, forming a flow hang.

Stream hanging problem and its solution

b. The solvent volatilization rate is too fast: the solvent in the solvent-based paint volatilizes during the construction process. If the solvent volatilizes too quickly, the viscosity of the paint may decrease rapidly during coating, resulting in run-off.

c. Temperature and humidity impact: The temperature and humidity of the construction environment will also affect the flow. Higher temperatures and humidity can cause the paint to flow faster, increasing the risk of run-off.

d. Coating formulation issues: Various ingredients in the formulation of coatings, such as rheological additives, pigments and resins, may have an impact on convection. Improper formulation may lead to instability of the paint and easy to flow.

Stream hanging problem and its solution

2. Solution to the stream hanging problem
To avoid or mitigate streaming problems, you can take the following steps:

a. Control viscosity: Controlling the viscosity of the coating is the key to prevent flow hanging. To ensure that the viscosity does not decrease rapidly during construction, appropriate rheological additives can be used or the viscosity of the paint can be adjusted.

b. Control of solvent volatilization rate: For solvent-based coatings, it is very important to control the volatilization rate of solvents. A slower volatilization rate can be achieved by adjusting the solvent composition or using spraying equipment to reduce the risk of run-off.

c. Adjust the construction conditions: temperature and humidity are important factors in the construction conditions. In high temperature and humidity environments, viscosity and fluidity need to be controlled more carefully to prevent the occurrence of flow hanging.

Stream hanging problem and its solution

d. Reasonable coating formulation: The formulation of the coating should be carefully designed to ensure compatibility and stability between various ingredients. Appropriate rheological additives and stabilizers can help mitigate flow-hang problems.

e. Use appropriate coating methods: Different coating methods have different effects on convection-hanging problems. Choosing an appropriate coating method can reduce the risk of run-off. For example, spray painting is often easier to control than brush painting.

f. Coating thickness control: Controlling coating thickness can also reduce the flow problem. Thicker coatings are less prone to flow, so the amount of coating can be adjusted to suit your needs.

Stream hanging problem and its solution

Flow hanging is a common problem in coating applications, but it can be effectively mitigated or avoided through reasonable control and construction methods. For applications that require high quality coating, special attention needs to be paid to the issue of flow hanging to ensure that the quality and appearance of the final coating meet the requirements. Correct selection of paint, control of construction conditions and selection of coating method are the key factors to solve the problem of flow hanging.

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