Toughener refers to an additive that can increase the toughness of materials. It is mainly used to improve the impact resistance, toughness and crack resistance of plastics, rubber, coatings and other materials, so as to improve the mechanical properties and service life of materials. Tougheners are usually polymer compounds or inorganic substances with high molecular weight and molecular weight distribution, which can form a uniformly dispersed phase in the material, thereby effectively absorbing and dispersing stress, and improving the toughness and impact resistance of the material. Common tougheners include polyurethane, acrylate copolymer, ethylene-propylene copolymer, calcium silicate, sodium aluminum silicate, etc.
Performance
The following are common tougheners and their properties and indicators that may need to be tested:
| Toughener | Properties and indicators that may need to be tested |
|---|---|
| Polyurethane | Tensile strength, elongation, impact strength, thermal stability, weather resistance, corrosion resistance |
| Acrylate Copolymer | Heat distortion temperature, glass transition temperature, tensile strength, elongation at break, impact resistance, weather resistance, chemical corrosion resistance |
| Ethylene-propylene copolymer | Impact strength, flexural modulus, thermal stability, tensile strength, elongation at break, weather resistance, chemical resistance |
| calcium silicate | Particle size, particle distribution, specific surface area, hardness, viscosity, rheological properties, dispersibility |
| Sodium aluminum silicate | Particle size, particle distribution, specific surface area, hardness, viscosity, rheological properties, dispersibility, thermal stability, weather resistance |
The properties and indicators to be tested mainly include physical properties, mechanical properties, thermal properties, weather resistance, corrosion resistance, etc. The specific detection methods and test standards may vary depending on the type of toughener, application scenarios and requirements. Commonly used test methods include tensile test, impact test, thermal analysis, particle analysis, rheological property test, etc. In practical applications, it is necessary to make reasonable selection and use according to specific requirements, and to carry out detection and control in the production process to ensure product quality.
Test Methods
How to detect the performance and index of the toughening agent specifically, need to choose the corresponding test method and test standard according to different performance and index. The following are several common testing methods:
Tensile test: It can measure the influence of toughening agent on the tensile strength, elongation and other properties of the material. Test methods include tensile test and shear test.
Impact testing: It is possible to measure the impact of tougheners on the impact resistance of materials. Test methods include impact test and drop weight test.
Thermal analysis: It is possible to measure the influence of the toughening agent on the thermal stability, glass transition temperature and other properties of the material. Test methods include thermogravimetric analysis, differential thermal analysis, thermal expansion analysis, etc.
Particle analysis: It can measure the particle size, particle distribution, specific surface area and other indicators of the toughening agent. Test methods include laser particle size analyzer, electron microscope, etc.
Rheological properties test: It is possible to measure the influence of tougheners on the rheological properties of materials. Test methods include Rotational Viscometer, dynamic mechanical analyzer, etc.
When testing the performance of toughening agents, it is necessary to select the corresponding test method and test standard according to the specific requirements, and ensure the accuracy and reliability of the test results.
