The Study On The Esterification Of Rosin Under The Microwave Radiation And Rosin Neutral Size Synthesis

In this paper,on the basic of research reason of low sizing degree of rosin size on neutral condition,we research molecular structure and properties of functional group of rosin,make it esterification under microwave radiation ,then select suitable composite surfactants,use the special retention agent,design and synthesize new neutral rosin sizing agents(include two ions of anionic and cationic)that have good sizing effect under neutral papermaking conditions,and we also make a detail representation o n t he condition o f a pplied c raft.main r esuits h ave b een obtained a s follows:1. Esterification is a important mean that can change the hydrophobic of rosin.we made it esterification under microwave radiation,researchered applied craft process of esterification from the use level of alcohols and the file number of microwave and the time of the reaction,and got the best process conditions.2. The author compounded the rosin and the rosin esterification with malairosin at some ratio,and product rosin neutral size in suitable emulsion.3. Anionic composite emulsifier that compose of l-6-7,To the compound of rosin, HLB13 has a suitable emulsion capacity for compound of rosin.and anionic rosin emuision made by this way has a good sizing effect under neutral papermaking condition;cationic composite emulsifier that compose of 2-5-9, HLB14 has a suitable emuision capacity for compound of rosin,and cationic rosin emulsion by this way has a good sizing effect under neutral papermaking condition.4. The anionic rosin emulsion is quite efficient for paper sizing in a wide PH region from 6.5 to 8.5.So the anionic rosin emulsion can meet with the requirement of sizing under neutral papermaking condition.The sizing effect of the cationic rosin emulsion is not as good as anionic rosin emulsion under neutral papermaking condition.In the neutral sizing with anionic composite emulsifier(or cationic composite emulsifier),aluminum suifate act as the role of fixing and location,the total amount of aluminum suifate is important under neutral papermaking condition.5. By the result of experiments,of the anionic rosin emulsion we can get the optimum process conditions;take technology of reverse sizing,the sizing effect of the cationic rosin emulsion is better.