At present,there are different reports on the crosslinking curing conditions of N-methylol acrylamide (NMA) self-crosslinking acrylate emulsions.A self-crosslinking styrene-acrylic emulsion was prepared with NMA as crosslinking agent.The effects of NMA dosage,dodecanethiol and heat treatment conditions on the properties of emulsion and latex film were studied.It was found that partial NMA could form crosslinked structures during the polymerization process.A certain amount of dodecanethiol can effectively prevent the occurrence of internal crosslinking reaction between NMA during polymerization.For this emulsion there was no crosslinking reaction at room temperature but crosslinking reaction can occur effectively above 110℃.Study on performance of the latex films indicated that,the crosslinking degree,the contact angle and tensile strength increased,while tensile elongation decreased with increase of the heat treatment temperature.
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