Polyurethane foam is a porous polyurethane material composed of a large number of microscopic pores and pore walls of polyurethane resin, also called “PU foam”. Polyurethane foam is the most used type of polyurethane products, accounting for more than 50% of the total polyurethane products.
Compared with other foam materials, polyurethane foam has many characteristics in terms of performance. In addition to low density, it is also odorless, breathable (open cell type), high heat insulation (closed cell type rigid foam) ), uniform cells, aging resistance, resistance to organic solvent erosion and other characteristics. It has strong adhesion to dissimilar materials such as metal, wood, glass, masonry, fiber, etc., which is inferior to other foam materials, so it is widely used in furniture cushions, mattresses, vehicle seat cushions, fabric composite products, packaging materials and sound insulation materials.
According to the softness and hardness of polyurethane foam, it can be divided into soft polyurethane foam (referred to as polyurethane soft foam, PU soft foam), rigid polyurethane foam (polyurethane hard foam, PU hard foam) and The semi-rigid polyurethane foam in between (polyurethane semi-rigid foam, also known as semi-soft foam abroad).
Polyurethane low-density rigid foams are mostly brittle materials. Most polyurethane rigid foams have a closed-cell structure and are foamed with low thermal conductivity foaming agents, so they have low thermal conductivity and are widely used in various heat insulation fields. High-density rigid foam has good toughness and high strength.
Polyurethane semi-rigid foam has a certain open-cell structure, which has good load-bearing performance and good vibration-absorbing performance. It is mostly used in cushioning materials and automotive parts.
Polyurethane soft foam is commonly known as polyurethane sponge and foam. This type of foam plastic has good elasticity and is mainly used in various thermal materials and cushioning materials, such as cushions, cushions and armrests for cars, boats, furniture, sofa seats, and beds. Pads, garment liners, etc.
PU soft foam is especially an ideal material for making furniture cushions and car and ship seats. At present, the cushions (fillers) of most seats, sofa cushions and backrests are made of PU soft foam. This is also the area where PU soft foam is used the most.
In addition, PU soft foam has good air permeability and moisture permeability, and is also suitable for making mattresses. For example, most of the mattresses called “Simmons” in our country are made of PU soft foam sheets, springs and fabrics. There are all PU soft foam mattresses, and polyurethane foams of different hardness and density can also be used to make double-hardness mattresses.
As a professional supplier of plastic additives, our company has accumulated many years of experience and continues to provide customers with the best modifier solutions for polyurethane foamed plastics.
Antioxidant series for PU:
Antioxidant 1135: a liquid hindered phenol antioxidant, especially in the field of polyurethane, which has excellent antioxidant performance and can prevent polyether Polyols generate peroxides during storage to inhibit yellowing; they can also prevent core burning during polyurethane foaming. Adding it to PU shoe materials, artificial leather and elastomer can also greatly improve the yellowing resistance level of the product.
Antioxidant 5057: a liquid hindered amine antioxidant, for the stabilization of polyurethane cushion foam, it can effectively inhibit the formation of peroxide during storage and transportation. Further prevent scorching during foaming; in industries such as automobile manufacturing, furniture and fiber fabrics that use soft foaming polyurethane, the low volatility of 5057 will avoid color stains on fabrics.
Anti-phenol yellow additive 2140: It belongs to a new generation of phenol-free phosphite antioxidants, and does not contain free phenols such as phenol, nonylphenol, and bisphenol A. It has the advantages of low volatility and good heat resistance, and can effectively inhibit the yellowing of PU materials caused by phenolic compounds.
Our company also stably produces high-quality UV absorbers and light stabilizers used in polyurethane soft foam and TPU elastomers, such as UV1, UV571, UV1130, B75, 292, etc. The combined use of UV and HALS can give full play to the synergistic effect between the additives and effectively prevent the degradation of polyurethane products under light or weather conditions, thus providing long-term and reliable protection.
