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[ Last edited by domoto on 2008-4-13 at 20:42 ]
3Â¥2008-04-13 20:34:07
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The results showed that, emulsifier in the thickening of the thickener, salt tolerance and rheology little impact, which mainly affect polymer particle size, the amount of emulsifier, from the size of small polymer, when the amount of emulsifier 9% (of the total water quality), polymer dispersion of particulate best£»Crosslinker thickening of the amount of thickener, salt and rheology of the larger. In the experimental area, with effective cross-linking of the increase in polymer rheology increase, decrease salt tolerance, a maximum viscosity thickening; initiator major impact on the thickening of the polymer, triggered dose of 0.3% (monomer volume), thickening properties of the polymer from the best;
Water is the main component of the RP-emulsion polymerization water increases the number of polymerization affected the stability of the polymer at the same time also affect thickening capacity, the experiment found that when polymerization and water, 70 per cent (of the total water quality), Thickening of the product the best polymerization temperature polymer rheology, with the polymerization temperature increases, the polymer rheology lower than the monomer copolymer thickener is the impact of the most important factors. With AANa / DMC copolymer molar ratio decreases, thickener electrolyte resistance increased, thickening and rheology lower.
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Results show that the quantity of emulsifier has much impact on the grain size of the polymer rather than on the thickening ability, rheology, or salt tolerance of the thickener. The more quantity, the smaller the grain size is. And when the emulsifier is at a level of 9%(of the total quality of water phase) , the polymer particles generated have the best dispersion and are at a grain size of about 0.85¦Ìm;The quantity of crosslinking agent has a great influence on the thickening ability, rheology, and salt tolerance of the thickener. At the experimental level, the increase of the crosslinking agent may result in the increase of the rheology, the decrease of the salt tolerance and may even lead to the maximum of thickening viscosity.The initiator mainly impacts on the thickening ability, and when it takes up 0.3% of the monomer, the best thickening ability of thickener is gained.
Water is a principal component of inverse emulsion polymerization, and the quantity of water may influence the stability as well as the thickening ability of polymer. It is also found in the experiment that the best thickening ability can be gained when the water takes up about 70%£¨of the total quality of water phase£©.The polymerizing temperature impacts on the rheology, of polymer. The higher the polymerizing temperature is, the lower the rheology of the polymer becomes.The ratio of copolymer is the most important factor affecting performance of thickener. When the copolymer mole ratio AANa/DMC decreases, the electrolyte tolerance of thickener increases while the the thickening ability and rheology decrease.
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