What are the technical performance requirements for impregnated materials?

2023-09-20 10:10:10

Impregnating materials are actually a kind of semi-finished materials for producing polyester tires and other large-weight carcasses and waterproofing membranes. The quality of impregnating materials directly affects the thermal stability, durability and climate stability of the coils. There are certain technical requirements for the production of impregnated materials for modified asphalt waterproofing membranes. What are the technical performance requirements for impregnated materials?

Technical performance requirements for impregnating materials for the production of waterproofing membranes:

1. Impregnating material components:

Asphalt is constantly changing under the influence of temperature, humidity, sunlight and other factors. The chemical composition of asphalt changes due to oxidation, condensation and polymerization. The resin is converted into a polymer component, which reduces the oil component and the resin component, and increases the asphaltene content, thereby accelerating the aging of the asphalt and reducing the weather resistance and durability; therefore, the oil component and the asphaltene are selected when the impregnating material is selected. Asphalt, otherwise the waterproof membrane produced will be evaporated into gas after being heated and exposed to sunlight, causing a certain pressure between the base and the coating layer to destroy the coating layer. Escapes and reduces service life.

2. Technical requirements for thermosetting and plasticizing of impregnated materials:

The thermal stability of asphalt refers to the resistance of asphalt to temperature changes, which is an ability of asphalt to maintain its own properties. Asphalt changes its physicochemical properties and mechanical properties under the action of temperature. This change in properties is due to the recovery of light fractions and oxidative polymerization. By plasticizing the asphalt, physical and chemical changes can be reduced and the temperature stability of the asphalt can be improved. The method of plasticizing asphalt is to add a certain amount of vinyl resin material or other plasticizing resin, and after fully stirring and mixing, the surface of the carcass fiber is wrapped with a pliable material to achieve the effect of enhancing thermal stability.

3. Adding requirements for production auxiliary materials:

When the waterproof coil produced from asphalt is in a high temperature state, the physical and mechanical properties are changed, the molecules become active, the stability stability becomes abnormal, and the plasticized asphalt on the surface of the carcass fiber is thermally separated, affecting the carcass and the surface. The layer modified asphalt material is combined to cause the overall sliding of the surface layer modified material. In order to avoid the above situation, a certain amount of homopolymerized thermosetting resin material may be added to the asphalt to make the plasticized modified asphalt have a fiber surface feeling. The temperature zone is widened, so that the physical properties of the carcass are stable in the low temperature zone, and the high temperature zone is thermoset to ensure the stable performance of the produced waterproof membrane and the long service life.