Molecular sieve loaded tin compound calcium-zinc thermal stabilizer and preparation method thereof
A technology of composite calcium-zinc and heat stabilizer, which is applied in molecular sieve compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of large waste, excessive consumption, and easy volatility, and achieve long-term high-efficiency thermal stability and convenient The effect of weighing
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preparation example 1~5
[0045] Preparation of the first molecular sieve:
[0046] The feeding molar ratio is x(CTAB):y(SiO2):z(HO2)=1:3:610.
[0047] Concrete synthetic steps:
[0048] ① Weigh 10 grams of cetyltrimethylammonium bromide (CTAB) and dissolve in 100 grams of deionized water to obtain solution A.
[0049] ② Take a certain amount of water glass, and slowly add water glass to solution A to obtain gel B.
[0050] ③Use hydrochloric acid (1mol / L) to adjust the pH of gel B to 9-10, and magnetically stir at room temperature for 3 hours to obtain mixed solution C.
[0051] ④ Pour the above mixed solution C into a polytetrafluoroethylene reactor, and crystallize at 100°C for 24 hours.
[0052] ⑤ The crystallized mixed solution was washed 5 times with deionized water, filtered with suction, and dried to obtain a white powder.
[0053] ⑥Put the white powder obtained in ⑤ in a box-type resistance furnace, and calcinate it in a two-step method in the box-type resistance furnace. First, slowly rais...
Embodiment 6
[0068] Example 6 uses a second molecular sieve.
[0069] Table 1 Molecular sieve-loaded tin-type composite calcium and zinc heat stabilizer ingredient ratio
[0070]
Embodiment approach
[0077] Regarding the heat stabilizing effect of the polyvinyl chloride heat stabilizer of the present invention on PVC, it is specifically investigated with an oven aging method. The implementation method is as follows:
[0078] According to the mixing ratio of heat stabilizer and PVC in Table 3, the materials were fed into the mixer and mixed, and the mixed raw materials were added to the 160B open plastic mixer, and rolled at 190°C for 5 minutes to make PVC sheets with a thickness of 1mm. Cut the prepared sheet into 30mm×20mm thermal aging test piece, place it on an aluminum plate, heat it in a thermal aging test box at a constant temperature of 180°C, take samples every 10 minutes, and record the color change. The degree of color change was compared to evaluate thermal stability.
[0079] The thermal aging results of the examples and comparative examples are shown in Table 4.
[0080] Table 3 Mixing ratio of heat stabilizer and PVC
[0081]
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