This article introduces the method of studying the curing reaction kinetics of epoxy resin using a differential scanning calorimeter (DSC). The DSC records the exothermic process of the curing reaction by measuring the heat flow difference between the sample and a reference, providing data for kinetic analysis. The curing reaction kinetics is based on the relationship between conversion, temperature, and time, commonly described by the Arrhenius equation. The experiment employs a dynamic heating mode, utilizing exothermic peaks at different heating rates to calculate parameters such as activation energy and reaction order using methods like the Kissinger method and the Ozawa method. These parameters help in understanding the curing mechanism and optimizing process conditions, although actual reactions can be complex and may require analysis through multiple methods.

2026-04-13

This article introduces how to combine a rheometer with an ultraviolet light source to study the curing process of photopolymerizable resins. Traditional methods struggle to observe real-time changes in material properties under light exposure. However, this combined technique allows for monitoring changes in modulus and viscosity as the resin transitions from liquid to solid while being irradiated with UV light, thereby enabling analysis of key information such as curing speed and gel point. The article also explains the system's composition, measurement principles, and lists important parameters such as gel time and curing rate. This method is widely used in fields like coatings and 3D printing materials. With future technological advancements, it holds promise for more complex photopolymerization studies.

2026-04-13

This article introduces how the gel time tester evaluates the curing speed of unsaturated polyester resin at room temperature. The instrument monitors changes in resin viscosity through a probe and records the gel time when the resistance reaches a set value, reflecting the curing speed. The curing speed is influenced by factors such as resin composition, initiator ratio, and environmental temperature and humidity. The measurement must be conducted according to standard procedures to ensure data accuracy. The length of gel time affects construction processes and requires comprehensive evaluation in combination with curing performance. This instrument is used to guide the selection of formulations and processes in composite material production, with future technology trends moving toward online monitoring and intelligent prediction.

2026-04-13

This paper discusses how to use a Shore durometer to measure the hardness of flexible resins and estimate their elastic modulus through theoretical models and empirical formulas. The Shore durometer evaluates material hardness based on the indentation depth of the presser needle, which correlates to some extent with the elastic modulus. The article introduces the principles of hardness testing, the conversion relationship between elastic modulus and hardness, and provides reference conversion coefficients for typical flexible resins. It also emphasizes that while this method is suitable for rapid assessment, the results are approximate due to material characteristics, and high-precision analysis still relies on direct mechanical testing.

2026-04-13

This article introduces how to use a compression strength tester to evaluate the compressive capability of highly filled resins. The tester applies pressure to measure the stress and strain of the material, obtaining key parameters such as compressive strength and elastic modulus. Due to the high filler content in highly filled resins, attention must be paid to issues such as sample preparation and interfacial bonding during testing. The article also analyzes various factors that influence test results, such as filler type and testing rate, and emphasizes the importance of optimizing material performance through standardized testing.

2026-04-13

The peel strength tester is used to measure the bonding performance of hot melt adhesive resins by simulating the actual peeling process and recording the changes in force values through constant-speed stretching. The measurement is based on adhesion theory, where the peel force is related to interfacial energy, sample width, peel angle, and speed. Testing must be conducted under standard conditions, with controlled temperature and humidity, and standardized sample preparation and instrument calibration. The data curve reflects the uniformity of adhesion and the failure mode. By combining analysis with process parameters, the performance of hot melt adhesives can be evaluated. Attention should be paid to test consistency and environmental factors to improve result reliability.

2026-04-13

A fatigue testing machine is a critical device for evaluating the long-term durability of resin-based composite materials. These materials are widely used in fields such as aerospace, but their performance gradually degrades under cyclic loading. Fatigue testing simulates actual stress conditions to assess the behavior of materials under dynamic loads, focusing on parameters such as stress levels and loading frequency. The results are often plotted as S-N curves to quantify fatigue performance. The tests must adhere to standards such as ASTM and ISO to ensure data accuracy. By analyzing information such as stiffness degradation and damage evolution, the durability of materials can be evaluated, providing a basis for the safe design and lifespan prediction of engineering structures.

2026-04-13

This article introduces the use of the Karl Fischer method in conjunction with a moisture analyzer to measure the water content in resin solvents. The method is based on the chemical reaction between iodine and sulfur dioxide in a specific reagent, which requires the participation of water. The instrument generates iodine through electrolysis and measures the electrical charge to precisely calculate the moisture content. The system includes a main unit, reagents, a sample injection device, and more. During operation, it is essential to maintain a dry environment, ensure uniform sampling, and pay attention to reagent safety and electrode maintenance. This method offers high sensitivity and fast results, making it suitable for detecting trace amounts of moisture. It is widely used in quality control across industries such as coatings and adhesives.

2026-04-13

This article introduces how to use a surface tensiometer to evaluate the wetting and spreading properties of resin liquids. Wetting and spreading affect the adhesion and appearance of products such as coatings and adhesives, and the process can be described using Young's equation and the spreading coefficient. A surface tensiometer can measure key parameters such as the surface tension and interfacial tension of liquids. Through a standard procedure combined with solid surface energy data, the spreading coefficient can be calculated, thereby quantifying the tendency of resin to spread on substrates. The article also mentions dynamic measurements, influencing factors such as additives and temperature, as well as practical considerations in application, emphasizing the importance of comprehensive data evaluation to optimize formulations and enhance product quality.

2026-04-13

The contact angle goniometer evaluates surface energy by analyzing the contact angle formed by a liquid droplet on a solid surface, based on the principle of Young's equation. Measuring the surface energy of resin after curing is crucial for properties such as coating adhesion and bonding. During measurement, the sample surface must be clean and flat. A liquid with a known surface tension (such as deionized water) is dropped onto the sample, and the instrument automatically calculates the contact angle. The polar and dispersive components of the surface energy are then determined using the Owens-Wendt method. Results can be influenced by factors such as surface roughness and environmental conditions, so multiple measurements under controlled conditions are necessary to ensure accuracy. For example, the total surface energy of an epoxy resin was measured at 38.2 mJ/m², with the dispersive component being dominant, which can guide material optimization and application.

2026-04-13

This article introduces how to study the compatibility of resin blends using differential scanning calorimetry (DSC). DSC analyzes the thermal properties of materials by measuring heat flow changes in a sample during heating. For resin blends, if the components are well compatible, a single glass transition temperature is typically observed; if they are incompatible, two transition temperatures close to those of the pure components are detected. During experiments, it is essential to control sample preparation and testing conditions. By analyzing the relationship between transition temperatures and composition using methods such as the Gordon-Taylor equation, the compatibility of the blends can be assessed.

2026-04-13

The Taber Abrasion Tester simulates material surface wear through rotational friction and is used to evaluate the wear resistance of coatings. During testing, a grinding wheel rubs against the specimen under a fixed load, and the performance is quantified by measuring mass loss or thickness changes after a specific number of cycles. Key parameters such as load, grinding wheel type, and rotational speed must be controlled according to standards (e.g., ASTM D4060) to ensure comparability of results. After testing, the data is analyzed based on the intended use of the coating. For example, decorative coatings focus on surface gloss, while functional coatings emphasize the number of wear cycles. The results can be used to optimize coating processes.

2026-04-10

The coating thickness gauge is used to measure the thickness of electroplated layers, primarily employing the electromagnetic induction method for non-magnetic coatings on magnetic substrates or the eddy current method for insulating coatings on non-magnetic metal substrates. During testing, it is essential to select an appropriate instrument based on the substrate and coating type, calibrate it, take vertical measurements, and evaluate uniformity by averaging multiple points. Results can be influenced by factors such as substrate properties and surface conditions, requiring reference to relevant standards and consideration of measurement uncertainty. This instrument enables rapid, non-destructive thickness testing, playing a crucial role in ensuring the quality of electroplated products and process control.

2026-04-10

This article introduces how a colorimeter is used to assess color differences in anodized coloring layers. It explains that the colorimeter converts colors into numerical values based on international standards and quantifies color changes by calculating the color difference ΔE. The article also details the preparatory work before measurement, standard procedures, and data analysis methods, and discusses the establishment of color difference tolerances and influencing factors. Finally, it mentions the limitations of colorimeters and suggests combining them with visual assessments for more comprehensive quality control.

2026-04-10

This article introduces how a haze meter detects the transparency and scattering characteristics of optical coatings. Optical coatings are used in fields such as displays and packaging, where their transparency and scattered light affect product performance. Haze is the ratio of scattered light to total transmitted light. Haze meters measure this parameter using the integrating sphere principle and conduct tests in accordance with international standards. Factors such as particles within the coating and surface roughness can influence haze values, so sample preparation must be standardized. The measurement results can be used to optimize coating processes and quality control, with practical applications in industries such as displays and packaging. Current technology is advancing toward higher precision and online detection.

2026-04-10

The contact angle goniometer evaluates the wettability of hydrophobic coatings by analyzing the angle formed by a liquid droplet on a solid surface. Its principle is based on Young’s equation, where a contact angle greater than 90° indicates hydrophobicity. Evaluation requires consideration of dynamic parameters such as advancing angle, receding angle, and roll-off angle, as well as surface energy estimation. Measurement results are influenced by factors such as ambient temperature and droplet volume, and operations should follow relevant standards. This technology is widely used in automotive, electronics, textile, and other fields to optimize coating performance, but limitations such as surface roughness and coating uniformity must also be considered.

2026-04-10

This article introduces a method for measuring the sealing quality of anodic oxide films using a coulometric thickness gauge. The sealing quality affects the corrosion and wear resistance of the oxide film. The coulometric thickness gauge evaluates the sealing effectiveness by measuring the electrical charge required to dissolve the oxide film through electrochemical principles, providing objective and reproducible results. The article details the measurement principles, operational steps, evaluation criteria, and precautions. It points out that this method is suitable for industrial quality control and laboratory research but also notes that it primarily tests the resistance to electrolyte penetration and may require combination with other methods for a comprehensive evaluation.

2026-04-10

Ultrasonic thickness gauges measure coating thickness using the principle of ultrasonic pulse reflection, calculating the result based on the propagation time of sound waves in the material and their velocity. When detecting thick coatings and composite coatings, challenges such as material sound attenuation, unknown sound velocity, and signal recognition at multi-layer interfaces must be addressed. Key techniques include sound velocity calibration, the use of high-resolution instruments to distinguish echoes from different layers, and selecting appropriate probes and methods for different situations. Operations must be standardized, including surface preparation, application of couplant, and taking multiple measurements to obtain an average value. This technology is widely used in fields such as shipbuilding, petrochemicals, and aerospace, and adheres to relevant technical standards to ensure detection accuracy.

2026-04-10

The eddy current thickness gauge utilizes the principle of electromagnetic induction, generating an alternating magnetic field through the probe coil, which induces eddy currents in the metal coating, thereby measuring thickness based on changes in coil impedance. This method is suitable for non-magnetic metal coatings on non-conductive substrates, such as plastic or ceramic, including gold, silver, copper, etc. Before use, calibration with standard samples is required. During measurement, factors such as substrate roughness, curvature, and coating conductivity should be considered. This technology offers the advantages of being non-destructive and providing rapid measurements, but it is not suitable for magnetic coatings or excessively thin coatings.

2026-04-10

The cross-cut test with adhesive tape is a commonly used method for evaluating coating adhesion. It involves scoring a grid pattern on the coating surface with a cross-cut knife, applying a specialized adhesive tape for rapid peeling, and observing the extent of coating detachment to determine the adhesion level. This method is simple to operate, provides intuitive results, and is suitable for coating inspections in industries such as automotive, construction, and furniture. The test must adhere to standards such as ISO and ASTM, with results categorized into grades ranging from 0 to 5. However, this method is qualitative or semi-quantitative and may have limitations for thick coatings or coatings with high adhesion. When necessary, it should be combined with other testing methods for a comprehensive evaluation.

2026-04-10