| As the paint constitution of ink-calcium carbonate, if its particle reached 20-60nm, and was modified to be compatible with ink binder。The products modified can make some effects on print ink production and improving the quality of printing ink。The modifications had some advantages, such as good stability, high glossiness, no harm to the drying property of printing ink, and they could reduce the cost of ink production。Modification process of nano_CaCO3 included wet and dry modification., and the modification method included mechanochemical process, high energy modification and surface chemical coating。This article adopted the wet method, and surface chemical coating with mechanical stirring。Firstly, it made some modified test on several kinds of modifiers, and selected a better modifier- stearic acid。Secondly, it took stearic acid to do several separate factor conditional experiments。Under the condition of modifier dosage 2%, modified time 30min, modified temperature 60℃, initial slurry concentration 8%, stirring speed 1400r/min, drying temperature 100℃, drying time 10h, the optimum product was obtained。Its activation index reached 99.9%, and contact angle reached 153.2°。At this optimization test, activation index and contact angle were used to characterize the activation effect of modified nano_CaCO3。By the other detection, the oil absorption value was 55.5gDOP/100gCaCO3, the glossiness was 7.2GS, the fluidity was 15.5mm, the transparence was bad (0.5ml oleoresin and 1g sample were mixed and grinded 300 times, there were some grey substances in the mixture)。These indices didn't measure the standard which this test refer to。So, in the process of modifying the nano_CaCO3 which will be used in ink, activation index and contact angle can be used to characterize the activation effect of modified nano_CaCO3, but they weren't used to characterize the quality of application。The test needed to characterize the quality of application by detecting the glossiness, oil absorption value, fluidity and transparence for a comprehensive characterization。 An important part of this test was that it made some modification tests on several kinds of modifiers, and it used the glossiness, oil absorption value, fluidity and transparence in the processing of characterizing。From the upper test, it could obtain the optimum modifier-ZCS-01, and then did several separate factor conditional tests of this modifier。From the separate factor conditional tests, it found when modifier dosage was 9%, all indice could measure the standard which this test refer to。So, in order to reduce the cost of modifier, it did several probe tests。The probe tests concluded making two modifiers to complex treatments, making three modifiers to complex treatments and making ZCS-01 with other modifiers to complex treatments。Finally, it decided to use one modifier of all-NDZ101 to make a complex treatment with ZCS-01, and did optimization tests。When it was under the condition of modified time 30min, modified temperature 90℃, initial slurry concentration 4%, stirring speed 1000r/min, drying temperature 100℃, drying time 10h, it could obtained the optimum medicine proportion was 3:2 (ZCS-01:NDZ101), optimum modifier dosage was 4%。The indexes of optimum product:oil absorption value was 41.0gDOP/100gCaCO3, the glossiness was 24.9GS, the fluidity was 30.5mm, the transparence was good。These indice measured the standard which this test refer to, so it obtained a good modification which could be instead of the modification of using one agent-ZCS-01, and it reduced the cost of agent using。It took IR and SEM to analysis the mechanisms in the test, and the analysis showed that: (1)There were chemical bonds between stearic acid and nano_CaCO3。The mutual actions between stearic acid and nano_CaCO3 were composed of chemical adsorption and physical adsorption, mainly of chemical adsorption。On this basis, the model of mechanism between stearic acid and nano_CaCO3 were set up。(2)Mechanism between ZSC-01 mixed with NDZ101 and nano_CaCO3 were the same as the upper one, and they all reacted with -OH on the surface of nano_CaCO3。There were also chemical bonds between the agents and nano_CaC03。The mutual actions between the agents and nano_CaCO3 were composed of chemical adsorption and physical adsorption, mainly of chemical adsorption。On this basis, the model of mechanism between the agents and nano_CaCO3 were also set up。The analysis of the indice and the test concluded that, it could use the glossiness, fluidity and transparence for a comprehensive characterization to characterize the measure of dispersion, so as to characterize the quality of application in ink。The modifier could make some effects on the fluidity and transparence。To use the modifier which could be compatible with ink binder and was a high transparency organic compound or macromolecular compound was very good to produce modification with high transparence and good dispersion。... |
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