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01 Introduction to Waterborne Acrylate Resin
The rapid development of the automotive industry since the 20th century has pushed automotive coatings to a new level in quality, output and variety. With people on the environment
Awareness of the problem, a series of strict environmental regulations and industry regulations have been formulated. In the field of coatings, in order to reduce the emission of volatile organic compounds,
Environmentally friendly coatings include waterborne coatings, and high solids coatings and powder coatings are gradually replacing solventborne coatings. In environmentally friendly coatings, waterborne coatings
Water is used as a solvent or dispersion medium, which has low pollution, low price and convenient construction. It is an important class of three types of environmentally friendly coatings.
Waterborne automotive coatings are prepared by mixing aqueous resin matrix, curing agent and other additives and deionized water in a certain proportion. acrylic acid
The ester resin is a high molecular polymer obtained by homopolymerization or copolymerization of acrylates and vinyl-based unsaturated monomers, and its main chain structure is stable.
It does not contain groups which are easily oxidized and hydrolyzed. The coating film prepared by the method has the characteristics of light color, gloss retention, color retention, brightness, weather resistance and corrosion resistance.
This is particularly suitable for the preparation of automotive coatings.
02 Significance of viscosity measurement and control
As an important component of zio for automotive automotive coatings, the viscosity of waterborne acrylate resins has a storage stability, workability and film forming properties.
Great influence is an important technical indicator for measuring the quality and performance of coatings. The viscosity is too high, which is not conducive to the spraying construction of the coating and affects the curing of the coating.
The performance of the paint film leads to poor leveling of the film, and the film is easy to form orange peel; if the viscosity is small, on the other hand, it is less in the process of dilution with water.
Water can dilute the resin coating to the construction viscosity. On the other hand, the decrease of the viscosity of the resin is favorable for the uniform dispersion of the resin in water and the dispersion size is small.
Thereby, the contact reaction between the curing agent and the resin aggregate is facilitated, and the paint film has better performance. The appropriate viscosity helps to improve the stability of the coating film.
Improve the leveling and construction properties of the film and obtain a good appearance of the film.
A large number of studies have shown that increasing the amount of acrylic monomer in the development and production of aqueous acrylate resin will increase the solubility of acrylic resin.
Properties and viscosity; increasing the amount of the aromatic ester group-containing monomer, initiator and chain transfer agent, and increasing the polymerization temperature can lower the viscosity of the resin. In addition,
The use of co-solvents in automotive coatings can effectively improve the water solubility of the resin, adjust the viscosity of the coating, thereby improving the performance and stability of automotive coatings.
Membrane properties.
03 Waterborne acrylate resin viscosity measurement
This article uses a DV2T standard viscometer with a small sample adapter SSA (shown in Figure 1) to measure the viscosity of an aqueous acrylate resin.
A viscosity test method designed to help users establish product quality control during the production and preparation of the product.
Figure 1 SSA+TC Series Water Bath Circulation System
The TC-650 AP water bath cycle system is used to control the sample temperature (test temperature is 25 ° C) and is connected to the host using Rheocalc T software.
Program editing and data acquisition, draw viscosity curve.
Measure a certain amount of the prepared aqueous acrylate resin in the sample cup of the SSA, slowly immerse the rotor into the sample, and then connect the viscosity
The main unit and the TC-650 AP water bath circulation system. Edit the corresponding test program on the RheocalcT software and start after the sample temperature is stable.
measuring. Select "MultiPoint" mode for data acquisition, the test time is 120s, the data collection interval is 10s, and a total of 12 is collected.
Data points, observe the viscosity change data during the test and the stability of temperature control.
Data is collected using the “Multi Point” function, and the “Test Averaging” function calculates the viscosity average and observes and analyzes the test.
Instrument stability and data fluctuations. According to Figure 2, the average value of the viscosity of the aqueous acrylic resin measured at 5 RPM
It is 23018 cP; during the test, the data fluctuation is often small, and the relative standard deviation is only 0.04%. Unique to Brookfield Digital Viscometers
The continuous sensor ensures the real-time and accuracy of the test data output. In addition, the temperature is very stable during the test and is always maintained at 25
Between ±0.01 °C.
The sample volume required for the SSA test is only 2-16 mL (the specific sample size is related to the rotor model used), which saves test costs.
Improve test efficiency; SSA uses a coaxial cylindrical rotor and a matching sample cup to calculate shear rate and shear stress for absolute viscosity;
The temperature control accuracy of the TC series circulating water bath system is as high as 0.01 °C, providing accurate and stable temperature conditions for viscosity testing.
04 Application Overview
As one of the well-known viscometer/rheometer manufacturers in Zui, AMETEK Brookfield has been committed to providing quality to its customers.
Reliable, high measurement accuracy, and measurement repeatability. Brookfield viscometers measure up to full scale measurement
±1%, repeatability can reach ±0.2%. Personalized solutions for viscosity testing needs in different industries, perfect for all kinds of lines
Analysis needs of industry users.
The RST rheometer offers comprehensive rheology testing for perfect rheological analysis in both quality control and R&D. RST series rheology
The instrument has two modes of controlling shear rate and shear stress, and is especially suitable for measuring the viscosity and rheological curve of non-Newtonian fluid under steady flow.
Sex. In addition, it can measure rheological properties such as viscoelasticity, yield stress and thixotropic properties in unsteady shear flow and creep conditions.
September 25, 2024
September 25, 2024
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September 25, 2024
September 25, 2024
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.