Application of viscometer

Take the Fungilab viscometer as an example below.

1. Paint industry

In the process of storage and transportation of paint Oil Bath, it is hoped that the system has a relatively high viscosity to prevent the precipitation of pigments and fillers;

At the beginning of construction, the viscosity is required to be constant, so as to facilitate extraction from the container;

In the process of painting, the viscosity of the system is required to be low, which is conducive to the leveling of the coating film, but the viscosity of the coating film is required to reach a higher viscosity within a certain period of time, so as to avoid the phenomenon of sagging and flowing of the coating film.

Fungilab instruments can be used: Fungilab standard viscometer, Stormer viscometer-GB-9269 (1988) Determination of the viscosity of architectural coatings Stormer viscometer method, CAP high-shear viscometer-GB-9751 (1988) Coating at high temperature Determination of viscosity at shear rate, R/S rheometer, online viscometer.

2. Daily chemical industry

The rheology of daily chemical products is very important. Daily chemical products maintain a high viscosity under the action of small external force, mainly to maintain the stability of the product. When using real products, it needs to be squeezed out, rubbed by hand and other external forces. At this time, the viscosity will drop quickly, which is convenient for consumers to use.

Thixotropy is the change in viscosity with time. After shearing, it takes some time for the product to return to its original viscosity. Some daily chemical products have a certain yield stress, that is, the external force needs to reach a certain value before the product can flow.

Cleaning products such as dish soap only need to meet the first point; most daily chemical products have the above-mentioned first and second points, such as shampoo, body lotion, body wash, hair conditioner and so on. Products such as nail polish and shampoo are thixotropic. Yield stress is mainly a characteristic of some pastes. Products such as toothpaste and hand cream need to measure yield stress.

Fungilab series viscometers can measure viscosity or some other characteristics; YR-1 yield stress rheometer can easily measure yield stress, especially for QC department; R/S rheometer can measure viscosity with temperature, shear rate/stress For changing curves, programs can be designed for thixotropy testing, which can better meet the needs of the R&D department; the online viscometer TT-100 can monitor the viscosity changes in production in real time, and keep abreast of production dynamics.

3. Pharmaceutical industry

Some medicines need to control the viscosity, such as adjusting the viscosity of the liquid in eye drops can make the eye drops stay in the eye for a long time; in ointment, it can make the ointment easy to apply. In Chinese Pharmacopoeia No. 2 (Western Medicine), there are requirements for viscosity control of some medicines, for example in Appendix IF: creams should have appropriate viscosity, and pastes generally have a thicker consistency. However, they should be easy to spread on the skin or mucous membranes, not melt, and the viscosity should change little with the seasons. In Appendix IG (ophthalmic preparations), Appendix IQ (otic preparations), Appendix IR (nasal preparations) and Appendix IU (gels), the viscosity of the above preparations should be adjusted as needed.

In gelatin production and capsule manufacture, viscosity is closely related to product quality.

Fungilab standard viscometer can measure the viscosity of ointment, injection, gelatin solution, etc., especially in the gelatin and capsule industry. If measuring yield stress, an R/S rheometer is a good choice. Online viscometer is the preferred real-time viscosity Measurement Instrument for the capsule industry.

4. Food industry

In dairy products, creamy taste and taste are strongly related to fat content, and at the same time, creamy taste and mouthfeel are also strongly correlated with the viscosity measured by the instrument. If the viscosity of yogurt is not properly controlled, it is easy to separate;

The gelatinization characteristic of starch is an important property of starch, which can be reflected by the viscosity-temperature curve; chocolate mainly exists in liquid form during the production process, and its viscosity control has a great influence on the coating property;

During the production process of fruit juice, it is necessary to control the appropriate viscosity to prevent the separation of fruit particles and pulp;

The sauce is required to be able to be poured out of the bottle when it is used, and it will not flow down when it is applied;

The main component of ice cream is hydrosol, so in the production of ice cream, the viscosity of ice cream sauce can be controlled to make different types of ice cream.

Of course, there are other videos that also need to measure viscosity, such as soy sauce, syrup, oil, etc.

As the viscosity of dairy products is not very high, it is more suitable to use the LV model; some dairy products are solidified, you can use paddle rotors or lifting brackets; the viscosity of chocolate is relatively high, use the H model, it is better to use the programmable model to easily estimate the yield Stress or with a V-type rheometer. Starch viscosity generally adopts RV model + programmable Water Bath.

In addition to some of the above industries, there are petroleum industry, ink, electronic industry (solder paste, silver paste), composite materials (resin and molding), lubricants, adhesives, asphalt, ceramics, textiles, blood, coal water slurry, Others (chemical industry, biology, papermaking, glass, gelatin, thickener) will use Rotational Viscometer, and Fungilab viscometer is the preferred choice. Its high quality and high performance are well reflected in these occasions.

In actual engineering and industrial production, it is often necessary to detect the viscosity of the fluid online to ensure a good process operating environment and product quality, thereby improving production efficiency. Through the online measurement of the liquid viscosity in the process, the data of the rheological behavior of the liquid can be obtained, which has important guiding value for predicting the process control of the product process, the conveyability and the operability of the product during use. The properties of the liquid are often related to other properties of the product such as color, density, stability, changes in solid content and molecular weight, and the most convenient and sensitive method to detect these properties is to detect the viscosity of the liquid online. In the production process, online viscosity detection is carried out according to the scope of process technical requirements, which can reduce the scrap rate of products and the downtime of production lines as much as possible.