Composite modifier and preparation method for modified aluminum hydroxide
A composite modifier and aluminum hydroxide technology, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problem of low aluminum hydroxide dehydration temperature, crystal water foaming, and affecting the mechanical properties of products, etc. question
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Embodiment approach 1
[0022] With Ca(H 2 PO 4 ) 2 with (NH 4 ) 2 SO 4 Synthesis of modifier as the main raw material and wet modification of aluminum hydroxide
[0023] The first step: the synthesis of composite modifiers.
[0024] Take the preparation of 5L composite modifier as an example to illustrate the preparation process. First heat 7L of calcium dihydrogen phosphate solution with a concentration of 16g / L to 80-95°C in a water bath, then slowly add ammonium sulfate solution with a concentration of 150g / L to it while stirring, and control the pH value at the end of the reaction at 4.2 -4.6; The filtered filtrate was evaporated and concentrated into a 5L solution, and then 80ml of polyacrylic acid and 10ml of TX-10 were added to it to obtain a composite modifier.
[0025] The second step: preparation of modified aluminum hydroxide. Take the filter cake containing 100g of ATH dry mass and add it to 200ml of deionized water to make a slurry, heat the slurry to 80-95°C while stirring, the...
Embodiment approach 2
[0029] with H 3 PO 4 with NH 3 ·H 2 Synthesis of Modifier with O as Main Raw Material and Wet Modification of Aluminum Hydroxide
[0030] The first step: the synthesis of composite modifiers.
[0031] In the stirred reactor, first dilute 68ml of concentrated phosphoric acid (concentration: 85%) with water to a concentration of 45%, and the relative density is about 1.3-1.4; Add ammonia water to control the pH value of the reaction end point at 4.2-4.6; then add 100ml of polyacrylic acid and 5ml of TX-10 to it, and then add deionized water to make a 5L solution to obtain a composite modifier.
[0032] The second step: preparation of modified aluminum hydroxide. The preparation process is the same as the second step in Embodiment 1, but the aluminum hydroxide dry micropowder is used.
[0033] It can be seen from Figure 6 that with the composite modifier provided by the present invention, the initial dehydration temperature of the thermal decomposition of aluminum hydroxide...
Embodiment approach 3
[0035] with added C 2 h 5 Dry Modification of Aluminum Hydroxide with Composite Modifier of OH
[0036] The first step: preparation of modified solution
[0037] In the stirred reactor, first dilute 68ml of concentrated phosphoric acid (concentration: 85%) with water to a concentration of 50%, and the relative density is about 1.3-1.4; Ammonia water, control the pH value of the reaction end point at 4.2-4.6, then add 1ml TX-10, 2ml polyacrylic acid and 25ml alcohol to the solution to form a modified solution.
[0038] The second step: preparation of modified aluminum hydroxide. Preheat the modified solution prepared in the first step to 45°C, and then add it to 2500g of hot aluminum hydroxide micropowder preheated at 120°C for 30 minutes in 5 times. Stir, and then dry the modified micropowder at 110-120°C for 12h. The aluminum hydroxide micropowder used in this embodiment is obtained by drying the filter cake in Embodiment 1.
[0039] By comparing Fig. 1 with Fig. 7, it ...
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