What kind of polymers can be used to make adhesives?
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Usually the adhesives we know are polymers. Is there a classification? What characteristics should polymers used as adhesives usually have? I don’t know who has some introductory information?
Polymer adhesive, as an adhesive, it should first have: Characteristics of connecting adherends ； Then there are the mechanical properties, thermal properties, weather resistance, solvent resistance, etc., and the specific conditions are analyzed in detail. This post was last edited by Panucci on 2009-3-19 10:48 ]
Classification of adhesives There are many ways to classify adhesives. According to the application method, they can be divided into thermosetting type, hot melt type, room temperature curing type, pressure sensitive type, etc.； Divided into structural, non-configurational or special glue according to application objects ； The connection forms can be divided into water-soluble type, water-emulsion type, solvent type and various solid types. Synthetic chemists often like to classify adhesives according to their chemical composition: thermoplastic cellulose esters, vinyl polymers (polyvinyl acetate, polyvinyl alcohol, perchlorethylene, polyisobutylene, etc.), polyester, polyether, polyamide, polypropylene Acrylate, a-cyanoacrylate, polyvinyl acetal, ethylene-vinyl acetate copolymer and other thermosetting epoxy resins, phenolic resin, urea-formaldehyde resin, melamine-formaldehyde resin, silicone resin, furan resin, unsaturated polyethylene resin Ester, acrylic resin, polyimide, polybenzimidazole, phenolic-polyvinyl acetal, phenolic-polyamide, phenolic-epoxy resin, epoxy-polyamide and other synthetic rubber-type neoprene rubber, styrene-butadiene rubber, butyl rubber, sodium butadiene rubber Glue, isoprene rubber, polysulfide rubber, polyurethane rubber, chlorosulfonated polyethylene elastomer, silicone rubber and other rubber-like resin agents, phenolic-nitrile rubber, phenolic-chloroprene rubber, phenolic-polyurethane rubber, epoxy-nitrile rubber, epoxy-polysulfide rubber, etc.
glue (glue): In ancient times, "glue" was boiled from animal skins, so it came from "meat". Original meaning: sticky substance, made of animal horns or resin, same as sticky (original meaning: sticky). Such as: sticky, sticky, viscosity, adhesion, adhesion, cohesion, zhān 〈verb〉 things adhere to each other and connect together: Sugar ~ teeth. Adhesive, glue, gum, cement, binder Definition (adhesive): A substance or material that connects the surfaces of two solid materials together through the interaction between molecules (atoms) in the interface (surface) layer is called an adhesive. Also known as adhesive, bonding agent, or commonly known as glue, glue. Adhesives are divided into natural and synthetic depending on the source of the main material.
1. The molecule is relatively flexible and can be entangled with the receptor molecule. 2. It has groups that can undergo chemical reactions to produce chemical bonds.
Agree with the above. A few summary points: The interface is adhesive ； A little cohesive strength ； It becomes flowable or viscoelastic under certain conditions.
I think it’s best to start with raw materials. Isn’t silicone rubber one of them?
Many kinds of polymers are available, such as silicone rubber, EVA, natural rubber, etc.
CPE and CPP are also available. The specific choice depends on the materials and uses that need to be bonded.
Low molecular weight epoxy resin, combined with some curing agents, can achieve...:time:
Epoxy...:victory:
Polyvinyl alcohol:victory:
Adhesives, usually one-component or two-component?
For example, the usual 502 is mainly ethyl cyanoacrylate! Hi guys, it’s mainly modified acetate!
In a broad sense, in addition to body-type polymers, other soluble and fusible polymers can be used as adhesives. Of course, a good adhesive also needs to have good interfacial bonding with the adhered matrix to prevent interface damage, and sufficient cohesion to prevent cohesive damage. Then, depending on the needs of the adhesive application site, good temperature resistance (including high and low temperatures), rheology, detachability, etc. may also be required.
Gelianghaopai household convenience adhesive is a single-component volatile drying adhesive that is mainly made of chloroprene rubber, added with tackifying resin, accelerator, anti-aging agent, stabilizer, organic solvent, etc. and refined through a special process.
If it is a metal interface, silane coupling agent is also a very good adhesive, providing a very strong Me-Si bond.