In order to give acrylate emulsion polymer with excellent tensile strength, hardness, wear resistance, creep resistance, adhesive strength, water resistance, alkali resistance, solvent resistance, heat resistance, anti fouling performance, often to the linear polymer emulsion crosslinking, cattle into three-dimensional network structure.
The most commonly used method is the introduction of crosslinking monomer with crosslinking in the comonomer, the emulsion copolymer obtained with crosslinking groups in the molecular chain, followed by polymer emulsion film forming process, under certain conditions, through the chemical reaction between the cross-linked copolymer chain groups, or by crosslinking groups the molecular chain and additional chemical reaction between crosslinking agent, formation of crosslinks, forming a crosslinked polymer.
The crosslinking monomer used in the preparation of crosslinkable polymer emulsion can be classified according to the properties of the cross-linked group provided.
More than double bond type crosslinking monomer with two double bonds, as the co monomer in the copolymerization emulsion, because of the space barrier, a kind of the crosslinking monomer molecules are only one double bond in the polymerization, emulsion polymer generated only lightly crosslinked, in the film-forming process followed, in the reaction conditions the higher, further in-depth cross-linking. More than double crosslinking common monomers two vinyl benzene, ethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, three propylene alcohol, three trimethylolpropane diacrylate three acrylate, ethoxylated trimethylolpropane acrylate, three to three Ma, three acid diallyl ester pentaerythritol allyl ester, terephthalic acid diallyl, methylene bis acrylamide.
This kind of polycarboxylic acid crosslinking monomer, crosslinking monomer with double bond carboxylic acid as comonomer, when introduced into the copolymer, the molecular chain makes the copolymer with a carboxyl group, which provides for crosslinking crosslinking reaction of the carboxyl group does not occur between the crosslinking reaction, and it requires a molecular chain or applied the crosslinking agent on the molecular hydroxyl, epoxy, metal ions and other chemical reactions to form crosslinked structure. Carboxylic acid type crosslinking common monomers are acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, etc.