Method for optimizing heat resistance of coated iron oxide yellow pigment
A technology of iron oxide yellow and encapsulation, which is applied in chemical instruments and methods, inorganic pigment treatment, phosphorus compounds, etc., and can solve problems such as insufficient heat resistance
Active Publication Date: 2022-05-13
HUZHOU TEACHERS COLLEGE +1
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Problems solved by technology
[0004] In order to overcome the problem of insufficient heat resistance of iron oxide yellow in plastic processing and powder coating application, the present invention provides a method for mixing iron phosphate and packaged iron oxide yellow pigment to improve the heat resistance of iron yellow pigment, through theoretical color difference value Mathematical solution to obtain the optimal ratio of iron phosphate, and establish a new method to quickly optimize the heat resistance effect of iron oxide yellow pigment
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Embodiment 1
[0013] Weigh 16.0g iron oxide yellow into a 1000mL large beaker, add 400mL distilled water, stir on an electric stirrer for 30min to obtain iron oxide yellow suspension; weigh 1.24g CaCl 2 ·H 2 O, 0.86g (NaPO 3 ) 6 and 0.34g NaOH; pour into three 100mL beakers and add 50mL of distilled water, and stir until completely dissolved; when the temperature is stable at 50°C, add the prepared three solutions into the iron yellow suspension at one time, and stir at constant temperature for 5h ; The product was filtered, washed, dried at 80°C for 12 hours, and finely ground to obtain calcium phosphate-coated iron oxide yellow pigment.
[0014] Weigh 15.2g of ferrous sulfate and 1.42g of disodium hydrogen phosphate, add 200mL of distilled water to dissolve them respectively, pour them into a 1000mL beaker, and keep stirring in the air for 3.5h. The obtained suspension is suction filtered, washed, and dried at 80°C for 12h , and finely grind to obtain iron phosphate.
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The invention relates to a method for optimizing heat resistance of a coated iron oxide yellow pigment, namely mixing a calcium phosphate coated iron oxide yellow pigment with iron phosphate so as to improve the heat resistance of the iron oxide yellow pigment. The heated b value (yellow phase) of the calcium phosphate coated iron oxide yellow pigment is reduced, and the heated b value of iron phosphate is increased, so that the yellow phase loss of the coated iron oxide yellow pigment during heating can be effectively compensated after the calcium phosphate and the iron phosphate are mixed. The optimal mixing ratio of the calcium phosphate coated iron oxide yellow pigment and the iron phosphate is found through mathematical calculation of color difference values, and the minimum value of the heat-resistant color difference of the mixed pigment is achieved. The calcium phosphate coated iron oxide yellow pigment and iron phosphate mixture synthesized by the invention has the advantages of good heat resistance, simple synthesis method, low cost, safety, environmental protection and the like, and can be used as a coloring agent in plastic processing and powder coating application.
Description
technical field [0001] The invention relates to a method for optimizing the heat resistance of an encapsulated yellow iron oxide pigment. Background technique [0002] In recent years, China's iron oxide industry has entered a stage of overcapacity and competition. Overcapacity is a major problem facing the entire iron oxide industry. At present, my country's iron oxide industry is still in the extensive development stage, and there is a lack of innovation in products and processes. It is impossible to transform resource advantages into economic and technological advantages. [0003] Iron oxide yellow, referred to as iron yellow, is hydrated ferric oxide with a molecular formula of FeOOH. Iron oxide yellow is a lemon yellow to brown powder, and its crystal structure and physical properties will vary greatly due to different production methods and operating conditions. Iron oxide yellow will gradually lose crystal water in an environment above 177°C and turn into iron oxide...
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IPC IPC(8): C09C1/00C09C1/24C09C3/06C01B25/37
CPCC09C1/0081C09C1/24C09C3/063C01B25/375C01P2006/62C01P2006/63C01P2006/64Y02P20/10
Inventor 潘国祥蒋黎豪徐敏虹郭玉华王艺涵李金花
Owner HUZHOU TEACHERS COLLEGE