What are the manufacturing methods of polyurethane foam-based absorbing materials? The selection of the base material of the absorbing material should follow the following principles:
1. The included amount of the wave absorber is large, the viscosity is small, and the specific gravity is light;
2. It can make the flame retardancy of the made absorbing material meet the requirements of national standards;
3. It has certain compressive strength, anti-aging, no deformation, and high temperature resistance;
4. The molding process is simple, the polyurethane foam has good compatibility with the wave absorbing agent and flame retardant, and can be produced continuously, and the made wave absorbing material has excellent physical properties and flame retardant properties. Therefore, the polyurethane foam Foam absorbing plastic has become the primary choice for the base material of the absorbing body. Polyurethane foam-based absorbing materials are divided into two types: hard and soft.
Manufacturing of soft polyurethane foam-based wave absorbing material: The manufacturing process of soft polyurethane foam-based wave absorbing material is as follows: raw material-foaming-cutting into a predetermined shape-impregnating wave absorbing agent-drying-finished product
The advantage of soft polyurethane foam-based wave absorbing material is that it does not require a specific shape of mold in production, and it can be cut as needed; the disadvantage is that the impregnation of the wave absorber needs to be done manually, so the production efficiency is relatively low. The entry volume of the product cannot be accurately controlled, and the product quality is also unstable.
Manufacturing of Rigid Polyurethane Foam-based Wave Absorbing Material:
Rigid polyurethane foam-based wave absorbing material is made by adding a wave absorbing agent such as a rigid polyurethane foam system, and then injecting it into a mold of a specific shape, and making it through reaction foaming. The technology of this absorbing product is very simple, the quality is also stable, and can be mechanized production.