Novel Synthesis of fluorescent brighteners
作者：admin时间：2020-07-15 05:58:39231 次浏览
信息摘要：
From the preliminary experiment found that the amount of alkali and reaction temperature on the intermediate 4 - chloro - stilbene-2 ??- have a greater impact on the yield of sodium. Therefore, more specifically examine the amount of al
From the preliminary experiment found that the amount of alkali and reaction temperature on the intermediate 4 - chloro - stilbene-2 ??'- have a greater impact on the yield of sodium. Therefore, more specifically examine the amount of alkali and reaction temperature on the reaction than n (base): n (triphenylphosphine) according to the operation, the other conditions unchanged, only to change the amount of alkali experiment to study the amount of intermediate alkali the yield of body paint coating eleven different choice of adhesive, thickener change, high and low viscosity; the impact of coating eleven blade, gauges the impact of coating layer thickness; drying a a hot air temperature and speed, dry forms. Add a way to dilute the low concentration of fluorescent brighteners add better way, way to avoid adding high concentrations of non-uniformity, resulting in "accumulation phenomenon" brightening effect is reduced. Using liquid fluorescent whitening agent can effectively reduce this phenomenon. Choice of two acid FWA type: V used as fluorescent brighteners in a low brightness requirements, under alkaline conditions suitable for coating. Four acid liquid by ~ PA-206, PA-207 is used to request a high brightness, suitable for use in acidic conditions of the coating. Six sulfonic acid type: fluorescence enhancement ~ PA-202 for applications requiring high brightness coated paper, suitable for use in acidic conditions. Paint a, paint: fluorescent brightener no affinity for the pigment, so no significant impact on the fluorescent whitening agent, they can only affect the basic white, basic white the higher the amount of fluorescent brightener less; Ti0. Can absorb UV light, fluorescent whitening agent can block the uv energy, thus affecting the whitening effect. Adhesives: The adhesive used with the anion, the effect of fluorescent whitening agent is not greatly affected thickening: thickening agent to adjust the coating and the like degeneration, water can also affect the lifetime of the coating, suitable The thickening agent in paints have improved the effect of fluorescent brighteners. Solid content: the retention of water in the paint and with countries of the area, whiteness can be increased with the increase in solid content. Carrier to make the best of the fluorescent whitening agent whitening effect, you must use a carrier or the so-called auxiliary adhesive. Fluorescent brightener suitable for the effect of the carrier under the order by decreasing: PVA, CMC, starch and synthetic auxiliary sided adhesive coating means coating: the coating on the fiber fluorescent whitening agent can move on, because the fluorescence whitening than the affinity of the fiber coating large, this phenomenon can select the appropriate FWA and thickener to prevent. If applying the second layer coating, only a small amount of a fluorescent brightener to move the first layer of paint, can be a good whitening effect. Two-sided coating: the coating on to get better coverage and reduce the impact of base paper whiteness
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