1. مقدمة

In the process of production and application of adhesives, اللزوجة هي مؤشر أداء مهم, which is directly related to its fluidity, construction performance and use effect. لذلك, the accurate determination of adhesive viscosity is of great significance for product quality control and application effect. This paper will introduce the measurement method based on rotary viscometer.

2. Test principle and method

في الظروف الطبيعية, high-viscosity liquids and viscous paint, latex paint, إلخ., have non-Newtonian flow properties, إنه, their viscosity will change with the shear rate. In order to determine the viscosity of adhesives, a rotary viscometer is usually used. By rotating the disk or blade and other parts, the instrument makes the sample produce rotary flow, and determines the stress required at a fixed shear rate, so as to calculate the viscosity value.

استخدام مقياس اللزوجة الدوار في تحديد لزوجة المادة اللاصقة

3. معدات

There are many kinds of rotary viscometers, which can be divided into different types according to the shape of the rotating parts, such as concentric disc type, internal and external simple rotation type, external and internal simple fixed type, slurry circular disc type and cone plate type. The thermometer is used to measure the temperature of the sample, with a separation of 0.1°C.

4. Operation points

In the determination of adhesive viscosity, it is necessary to pay attention to the following operating points:

Select the right rotor and speed: Select the right rotor and speed according to the viscosity of the sample, so that the measured value falls in the range of 20-80% of the dial.

Balance sample temperature: Ensure that the temperature of the sample is in balance with the test temperature, and keep the sample temperature uniform.

Dip the central part of the sample: dip the rotor vertically into the central part of the sample, and make the liquid level reach the rotor level mark.

Start the rotary viscometer: After starting the viscometer, observe the reading when the needle remains unchanged on the disc during rotation.

استخدام مقياس اللزوجة الدوار في تحديد لزوجة المادة اللاصقة

5. Result presentation and precautions

Each sample needs to be repeated three times, and the smallest value is taken as the test result, with three significant digits reserved. During the operation, note the following:

Loading and unloading rotors: Handling rotors should be handled with care to avoid excessive force causing the rotor to bend. After the rotor is installed, the instrument must not be placed sideways or upside down.

Keep clean: the connecting screw and the rotor connection end face and thread should be kept clean, the rotor should be cleaned in time after each use, and properly placed in the rotor frame.

6. التطبيق والأهمية

Viscosity measurement of adhesives is of great significance in production, quality control and application:

Production control: The viscosity of the adhesive is closely related to its formulation and process parameters, and the consistency of the product can be controlled through viscosity measurement.

Application performance: The viscosity of the adhesive directly affects its fluidity, coating performance and adhesion during construction and use.

Quality assurance: Viscosity measurement helps to guarantee the quality of the adhesive and ensure that the product meets the design requirements.

استخدام مقياس اللزوجة الدوار في تحديد لزوجة المادة اللاصقة

7. خاتمة

The determination of adhesive viscosity is a difficult or missing part of the adhesive industry. Through the measurement method of rotary viscometer, the viscosity value of the adhesive can be accurately obtained, which provides an important reference for the production and application of the product, thereby improving the performance and quality of the product.