PolyurethaneAdhesiveMainly composed of ammonium isocyanate, polyol, hydrocarbon-containing polyether, polyester and epoxy resin, fillers, catalysts and solvents. <font face=" It has many excellent properties such as high reactivity, curing at room temperature, and impact resistance.
Polyurethane glue is generally divided intoSingle-component and two-componentTwo basic types, The single component is divided into Moisture curing type, two-component reaction curing type. One-component glue is easy to construct, while two-component glue has the characteristics of fast curing and good performance, but it requires preparation when used and the process is more complicated. Both have their own prospects for development.
Polyurethane adhesiveThe bonding strength is slightly smaller and is prone to yellowing,but the wear resistance and toughness are relatively high. One-component polyurethane adhesive can be cured at room temperature and requires lower conditions. Epoxy adhesiveIt has high bonding strength and shear strength, and has a wide range of applications. It can bond most materials except polyolefin materials, and is known as an all-purpose adhesive. Single-component epoxy adhesive requires higher temperatures and may require heating or special treatment.
Polyurethane adhesive raw materials and epoxy resin adhesive raw materials are actually toxic. For example, most polyurethane curing agents are isocyanates and have high activity. , which is very harmful to human kidneys. The organica tin in the catalyst is a poisonous or highly toxic chemical raw material. The amine curing agents in epoxy resin adhesives are also toxic, and the reactive diluents are poisonous or highly toxic chemical raw materials. However, These two adhesives are basically non-toxic after curing, so I can’t tell which type is less toxic. I can only say that the application is slightly different.
There are differences between polyurethane adhesives and epoxy adhesives, but there are also many overlapping areas, For example, wood in building materials , stone, metal and fiberglass. For those with high toughness requirements, you can choose the former. For example, the air purification industry uses filter paper for high-efficiency filters to bond with aluminum frames. For those with high strength requirements, you can choose epoxy glue. Adhesive.
So, what questions do you usually have about polyurethane glue and epoxy resin glue? Editor The following points are summarized here:
Which one is less toxic, polyurethane adhesive or epoxy resin adhesive?
Both polyurethane adhesive raw materials and epoxy resin adhesive raw materials are toxic. For example, most polyurethane curing agents are isocyanates, which are highly active and harmful to There is great harm to human kidneys. Organotins in catalysts are poisonous or highly toxic chemical raw materials. The amine curing agents in epoxy resin adhesives are also toxic, and the reactive diluents are poisonous or highly toxic chemical raw materials. However, both are basically non-toxic after they are completely cured, so it is not clear which one is less toxic. It can only be said that the application is slightly different.
The above two adhesives What are the advantages and disadvantages of each?
Polyurethane adhesive has slightly lower bonding strength and is prone to yellowing, but has higher wear resistance and toughness. One-component polyurethane adhesive can be cured at room temperature and requires lower conditions. Epoxy resin adhesives have high bonding strength and shear strength, and have a wide range of applications. They can bond most materials except polyolefin materials, and are known as universal adhesives. One-component epoxy adhesives require higher temperatures and may require heating or special treatment.
bonding metal, also What adhesives can be used?
sticky Acrylic adhesives can also be used to join metals, and unsaturated polyester adhesives are less commonly used.
Both glues are In what fields is it applied?
The two have many overlapping fields, such as: wood, stone, metal and fiberglass in building materials of bonding. The former can be used for those with high toughness requirements, such as the bonding of filter paper and aluminum frames for high-efficiency filters in the air purification industry, or. For those with high strength requirements, epoxy adhesives can be used.
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