Which is less toxic between polyurethane adhesive and epoxy adhesive?

Answer 1, polyurethane adhesive raw materials and epoxy resin adhesive raw materials are toxic, for example, polyurethane curing agents mostly belong to isocyanates, which have high activity and are more harmful to human kidneys. The organotins in the catalyst are toxic or highly toxic chemical raw materials. The amine curing agent in epoxy resin adhesive is also toxic, and the reactive diluent is a toxic or highly toxic chemical raw material.

However, the two are basically non-toxic after complete curing, so it is not clear which type is less toxic, and it can only be said that the application is slightly different.

Answer 2: Polyurethane adhesive has slightly less bonding strength and is easy to yellow, but its wear resistance and toughness are relatively high. One-component polyurethane adhesives can cure at room temperature and moisture with low requirements. Epoxy adhesive has high bonding strength and shear strength, and the scope of application is not only wide, but can bond most materials except polyolefin materials, and is known as all-purpose adhesive.

One-component epoxy adhesives require high temperatures and may require heating or special treatments.

Answer 3, acrylic adhesives can also be used to bond metals, and less unsaturated polyester adhesives are used.

Fourth, there are many intersecting areas between the two, such as the bonding of wood, stone, metal and FRP in building materials. The former can be used for those with high toughness requirements, such as the footwear industry for the bonding of soles and uppers. For those with high strength requirements, epoxy adhesives can be used.

Both have their own advantages, the isocyanate group of polyurethane adhesive is also toxic, and the curing agent of epoxy resin adhesive contains amines that are also carcinogenic. Be careful, work protection is very important.

Basically agree with the answer upstairs, but it is clear that polyurethane is isocyanate and very toxic.

Sticking to metal The best is still acrylic adhesive.

Epoxy resin is composed of bisphenol epichlorohydrin active monomer and aliphatic amine or aromatic amine curing agent (ethylenediamine, triethylenetetramine, N,N-dimethylaniline, etc.), and formaldehyde aqueous solution is its undesirable solvent, which generally does not have this test item. Phenolic, urea-formaldehyde, and melamine resin adhesives may contain a certain solid content of formaldehyde dilution, and polyvinyl formaldehyde in plywood woodworking white latex may also contain free formaldehyde components.

This question has been revised since December 3, 2021 and has replaced the previous version on April 30, 2017).

Epoxy resin. It does not contain formaldehyde, and it is also impossible to use the aqueous solution of formaldehyde as a diluent.

The components of the double limb noise ring disperse car oxygen glue are solvent-based.

Epoxy resin adhesives generally do not contain formaldehyde, acetaldehyde and other aldehydes, and aldehyde compounds are easy to react and inactivate with its curing agents such as polyethylene polyamine (E51) and small molecule polyamide resin (E44 and below epoxy value). Formaldehyde is a water-soluble polar organic solvent, and it is not soluble in the epoxy resin itself and the curing agent with the sweet potato, usually the industrial grade is an aqueous solution containing 50% water, and the pure formaldehyde is easy to self-polymerize into POM resin, which is the advanced material of the common mechanical keyboard keycaps of our debaters, please refer to.

Epoxy resin adhesives generally do not contain formaldehyde, acetaldehyde and other aldehydes, and aldehyde cavity compounds are easy to react and inactivate with its curing agents such as polyethylene polyamine orange form (E51) and small molecule polyamide resin (E44 and below epoxy value). Formaldehyde is a water-soluble polar organic solvent, and it itself is not soluble in epoxy tree sail resin itself and its curing agent

Epoxy resins are non-toxic, but amine curing agents have a weak odor and toxicity. Once the epoxy adhesive is properly mixed with the hardener and fully cured, it will eventually become a stable, inert plastic that is non-toxic and is generally used for industrial purposes.

Non-toxic is not the same as "food safety", so it is still not recommended to use it to make cups, plates or drinking water pipes. As a generic description, the end result of curing epoxy resin is a stable plastic material. Epoxy resins have both secondary hydroxyl and epoxy groups, and the secondary hydroxyl group can react with isocyanates.

Epoxy resin is directly added to the hydroxyl group of polyurethane adhesive as a polyol, and only the hydroxyl group participates in the reaction using this method, and the epoxy group fails to react.

Epoxy resin itself is not toxic and is a non-toxic productHowever, when using or as an ingredient in other materials, a curing agent may be added, which is slightly toxic, but the toxicity is low, so don't worry too much. In addition, the formula system of epoxy resin is very complex and involves many things, so it is necessary to strictly operate the procedures and take protective measures when processing, producing and using.

Shanfeng Chemical specializes in the production of various types of epoxy resin curing agents:Phenalkamine epoxy curing agent, cardanol epoxy curing agent, polyamide epoxy curing agent, low temperature underwater epoxy curing agent, special amine epoxy curing agent, aliphatic amine epoxy curing agent, aliphatic cyclic amine epoxy curing agent, T-31 series, etc.

Hello dear! We'll be happy to answer for you. Can't figure out which one is harder, epoxy glue or polyurethane?

Answer: Advantages of polyurethane: (1) Wide range of hardness.

2) High strength. (3) The adjustable range of performance dust mill is large. A number of physical and mechanical performance indicators can be changed within a certain range through the selection of raw materials and the adjustment of formulas, so as to meet the different requirements of users for product performance (4) Wear resistance.

It is known as "wear-resistant rubber". (5) Oil resistance. The oil resistance of polyester polyurethane elastomers is not lower than that of nitrile rubber, which is comparable to that of polysulfide rubber.

6) Excellent ozone resistance. (7) Good shock absorption, radiation resistance and air permeability. (8) The processing methods are diverse and the applicability is wide.

Disadvantages of polyurethane: (1) Large endogenous heat generation, high temperature resistance is average, especially damp heat resistance is not good. The normal use temperature range is -40 120 use.

If long-term action is required under high-frequency oscillation conditions or high-temperature conditions, corresponding modification measures must be taken in the structural design or formulation. (2) It is not resistant to strong polar solvents and strong acid and alkali media. At a certain temperature, alcohols, acids, and ketones will swell and degrade polyurethane elastomers, and solvents such as chloroform, dichloromethane, dimethylformamide, and trichloroethylene will swell polyurethane elastomers at room temperature. Nian Pai.

Epoxy resin adhesive is liquid and has a certain toxicity (** is the volatile raw material in the stupid draft), but the adhesive is non-toxic after curing. Epoxy resin adhesives are divided into flame retardant and non-flame retardant grip socks, flame retardant epoxy resin adhesives are generally UL certified, and the highest flame retardant level is ULVO grade.