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thickener yunan pt yifen

thickener yunan pt yifen

the addition of thickener will not only thicken the waterborne coatings but also improve... PU water dispersions . The PEG and seal end agent were introduced into a four necked vessel with reflux condenser, stirrer, and thermometer and then heated to 100°C and dehydrated under vacuum for 2h. Then the vessel was cooled to 70°C for the dropping of IPDI with high speed stirring. When the dropping of IPDI was finished, the mixture was heated up to 80°C for the addition of catalyst. And then the reaction system was heated to 120°C and stirred for 3 minutes. Finally, the reaction was stopped and the material was moved to the oven preheated to 100°C, and then the yellow solid products were obtained after the materials were dried for 6 hours. The yellow solid was dissolved in solvents with appropriate proportion, and then they were put into...

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Figure 1shows the effects of different theoretical molecular weight on the thickening effect of PU dispersions. The results indicate that the thickening effect has some improvement with the increase of theoretical molecular weight . The reason may be that the hydrophobic segment and hydrophilic segment have a certain degree of growth with the increase in molecular weight, which is more conducive to make the thickener molecule to format network in the system; but with the further increase in molecular weight , the thickening effect has no apparent change. As the same time, the adhesion level of the reactor increases with the yield decreased. Taking into account the thickening effect and yield, the theoretical molecular weight of 20,000 is selected. Figure 2is the theory of molecular weight of 20,000 thickener GPC curves. It can be seen that the GPC curve has an obvious outflow peak, the weight average molecular weight of polymer is 19,016 and molecular...

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From the previous results and discussions, different monomer ratio and preparation parameters will have great influence on the thickening effect of PU thickener. The effective PU thickener with higher hydrophobic segment and tailored molecular weight can be obtained by the selection of suitable monomer ratio, solvent proportion and theoretical molecular weight, and so forth. Moreover, the better understanding of the thickening mechanism prepared in this paper is presented by the CMC determination and analysis of the particle size and morphology of the aqueous dispersions thickened by the PU thickener.

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