Adhesive for non-woven fabrics: definition and classification
definition:
Adhesive for non-woven fabrics refers to a chemical substance used to bond non-woven fibers together, forming a material with certain strength and functionality. They form strong bonds between fibers through different mechanisms of action, thereby endowing non-woven fabrics with the required properties.
Category:
According to their chemical composition and application methods, adhesives for non-woven fabrics are mainly divided into the following categories:
1. Chemical adhesive:
Definition: Forming adhesive force through chemical reaction curing.
Common types:
Acrylic ester: It has good adhesive strength, water resistance, and weather resistance, and is widely used in fields such as sanitary materials and filter materials.
Ethylene vinyl acetate copolymer (EVA): It has excellent flexibility, low temperature resistance, and adhesive properties, and is commonly used for bonding hot melt adhesives and composite materials.
Polyurethane (PU): Featuring high strength, wear resistance, and oil resistance, it is suitable for bonding high-performance non-woven fabrics.
Advantages: High adhesive strength and good durability.
Disadvantages: There may be issues such as solvent evaporation and poor environmental friendliness.
2. Hot melt adhesive:
Definition: Melting under heating conditions, solidifying and bonding after cooling.
Common types:
Polyolefins, such as polyethylene (PE) and polypropylene (PP), have advantages such as low cost and good processing performance.
Polyamide: It has a high melting point, strength, and wear resistance, and is suitable for bonding in high-temperature environments.
Advantages: solvent-free, environmentally friendly, and fast bonding speed.
Disadvantages: Limited high temperature resistance and bonding strength may not be as good as chemical adhesives.
3. Water soluble adhesive:
Definition: Using water as a solvent, adhesive force is formed after drying.
Common types:
Polyvinyl alcohol (PVA): Has good adhesion and film-forming properties, commonly used for bonding paper and textiles.
Starch: Natural and environmentally friendly, but has poor adhesive strength and water resistance.
Advantages: environmentally friendly, non-toxic, and low cost.
Disadvantages: Poor water resistance and limited adhesive strength.
Other classification methods:
By form: liquid, powder, solid, etc.
According to the curing method: heat curing, light curing, moisture curing, etc.
Choosing the appropriate adhesive requires consideration of the following factors:
The ultimate use of non-woven fabric
Fiber type
Processing technology
cost
With the continuous development of the non-woven fabric industry, new environmentally friendly, high-performance, and functional adhesives continue to emerge, expanding the application space of non-woven fabrics.