A chromium-reducing agent and cement-based mixture using the chromium-reducing agent
A chromium-reducing agent and dispersant technology, applied in the field of cement materials, can solve the problem of weakening the chromium-reducing effect, and achieve the effect of effective chromium-reducing effect, enhanced fluidity, and improving the odor of the chromium-reducing agent
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Embodiment 1
[0055] A chromium-reducing agent, comprising the following raw materials in parts by mass:
[0056] The chromium reduction composition includes 17 parts of 3-methylamino-1,2-propanediol, 5 parts of 10-undecene aldehyde, 3 parts of zinc sulfoxylate formaldehyde, and 7 parts of sodium nitrite;
[0057] The dispersant is 8 parts of modified shell powder. The modified shell powder is obtained by soaking shell powder in 1 mol / L sodium hydroxide solution for 4 hours, draining, washing, and drying at room temperature. The particle size of modified shell powder is 400± 20nm;
[0058] Diluent, the diluent is water, and its dosage is 5 times the mass of the chromium reduction composition.
[0059] The preparation method of above-mentioned chromium reducing agent is as follows:
[0060] S1: get 8kg of dispersant and mix with 5kg of 10-undecene aldehyde, after mixing, let stand for 4h to obtain a mixture, add the mixture to the preparation water of the mixed solution A whose mass is 5 t...
Embodiment 6～7
[0091] A kind of chromium reducing agent, it is based on the preparation method of embodiment 4, and the difference is that the amount of raw materials is different. The specific raw material consumptions of Examples 6-7 are shown in Table 3 below.
[0092] Table 3. The experimental test results of the influence of chromium reducer air oxidation of Examples 1 to 5 and Comparative Example 1
[0093] Chromium reducer raw materials Comparative Example 2 Comparative Example 3 Example 6 Example 7 Dispersant / kg 6.5 6.5 6.5 0 10-undecene aldehyde / kg 5 5 5 0 Zinc sulfoxylate formaldehyde / kg 3 3 0 3 Sodium nitrite / kg 0 30 6 6 3-Methylamino-1,2-propanediol / kg 30 0 24 24 Mixed solution A preparation water / kg 57.5 57.5 57.5 0 Mixture B preparation water / kg 132.5 132.5 117.5 165 Total water / kg 190 190 175 165 The proportion of chromium reducing composition in chromium reducing agent 16.2 16.2 16...
Embodiment 8
[0095] A chromium reducing agent, which is different from Example 4 in that the same quality 3-diethylamino-1,2-propanediol is used instead of 3-methylamino-1,2-propanediol.
[0096] The chromic reducing agents of Comparative Examples 2 to 3 and Examples 6 to 8 were subjected to an experimental test on the influence of air oxidation, and the test results are shown in Table 4 below.
[0097] Table 4. Experimental test results of the influence of air oxidation of chromium reducers of Comparative Examples 2 to 3 and Examples 6 to 8
[0098]
[0099]
[0100] * The sample of Comparative Example 3 separated and formed an obvious oil film above the liquid level between 19 and 20 hours, so the follow-up test was not carried out.
[0101] From Example 4, Comparative Example 2 and Comparative Example 3, combined with Table 4, it can be seen that the compound use of 3-methylamino-1,2-propanediol and nitrous acid in the chromium reducing component of the present application can pla...
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