(1)Excellent bonding performance: it can bond metal, plastic, wood, glass and other materials.
(2)Good flexibility: after curing, it has good flexibility and impact resistance, and is suitable for dynamic environment.
(3) Wide temperature range: stable performance can be maintained in a wide temperature range.
(4) Environmental protection: With the technological progress, waterborne or solvent-free polyurethane adhesives have gradually become the mainstream.
2. Why do you need to test the chemical corrosion resistance of polyurethane adhesive?
In practical application, polyurethane adhesive may be exposed to various chemical environments, such as acid, alkali, salt solution or organic solvent. These chemicals may lead to the degradation, failure or even destruction of the adhesive layer, affecting the bonding effect and service life. Therefore, it is very important to test its chemical corrosion resistance for the following reasons:
(1) Ensure product quality: Evaluate the stability of products in different chemical environments through testing.
(2) Optimize the formula design: improve the formula according to the test results to improve the corrosion resistance.
(3) Meet customer needs: provide reliable data support for customers and enhance market competitiveness.
(4) Prolonging service life: Help users choose products suitable for specific application scenarios.
3. What are the common test methods for chemical corrosion resistance of polyurethane adhesives?
(1)Immersion test
The sample was placed in a specific chemical reagent for a certain period of time and its changes were observed. Commonly used reagents include sulfuric acid, hydrochloric acid and sodium hydroxide.
(2)Dynamic mechanical analysis (DMA)
The modulus and loss factor of materials were measured in different chemical environments, and their structural changes were evaluated.
(3)Surface morphology analysis
Scanning electron microscope (SEM) was used to observe the changes of the surface microstructure of the samples.
4. How to evaluate the chemical corrosion resistance of polyurethane adhesive?
Evaluation of the chemical corrosion resistance of polyurethane adhesives can be started from the following aspects:
(1)Appearance change
Observe whether the color, shape and luster of the sample change in the chemical reagent.
(2)Mechanical property change
The tensile strength, shear strength and peeling strength of the samples before and after soaking were determined.
(3)chemical stability
Analyze whether the sample is decomposed or crosslinked under the action of chemical reagents.
(4)mass loss rate
Calculate the percentage of mass change of the sample during soaking.
5.What is the research direction of chemical corrosion resistance of polyurethane adhesives in the future?
With the development of industrial technology, the research on chemical corrosion resistance of polyurethane adhesives is developing in the following directions:
(1)Develop new modifiers
Nano-materials or functional fillers are introduced to improve the chemical stability of the adhesive.
(2)Optimize the production process
Improve the synthesis process, reduce the content of by-products and improve the purity of products.
(3)Establish a more perfect evaluation system
Combining big data and artificial intelligence technology, an intelligent performance prediction model is constructed.
(4)Expand application scenarios
To meet the needs of new energy, aerospace and other fields, a special high-performance adhesive was developed.
