High-temperature guanidine gum cross-linking agent and preparation method thereof
A technology of cross-linking agent and guar gum, which is applied in the field of high-temperature guar gum cross-linking agent and its preparation, to achieve the effects of excellent temperature resistance and shear resistance, small amount of residue of gel-breaking liquid and surface tension, and short gel-breaking time
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Embodiment 1
[0055] The synthesis of embodiment 1 organoboron crosslinking agent (BOC)
[0056] Dissolve a certain amount of borax in the organic solvent according to the proportioning ratio (the solvent is a mixed solution of glycerol and water), add the basic catalyst NaOH, set the first reaction temperature, add the ligand polyhydric alcohol after the first reaction time, set The second reaction temperature, after the second reaction time, adjust the pH value to 7-8 to obtain a colorless and transparent solution, that is, an organoboron crosslinking agent (BOC).
[0057] The main factors affecting the synthesis of organoboron crosslinking agent are: the amount of sodium tetraborate, the amount of ligand, the amount of glycerol, and the second reaction temperature. In the case of constant experimental conditions, a single control variable was used to investigate the effects of different variables on the appearance and performance of organoboron crosslinking agents, and to determine the o...
Embodiment 2
[0081] The synthesis of embodiment 2 organic zirconium crosslinking agent (ZOC)
[0082] Dissolve a certain amount of zirconium oxychloride in an organic solvent according to the proportion, add an acidic catalyst, set the first reaction temperature, add the ligand polyhydric alcohol after the first reaction time, set the second reaction temperature, and the second reaction time ends Finally, adjust the pH value to 3-5 to obtain a light yellow transparent solution, which is the organic zirconium crosslinking agent (ZOC).
[0083] The four main factors affecting the synthesis of organic zirconium crosslinking agent are: the amount of zirconium oxychloride, the amount of ligand, the first reaction temperature and the reaction time. Orthogonal experiment to prepare organic zirconium crosslinking agent.
[0084] (1) The amount of zirconium oxychloride
[0085] Under the same experimental conditions, 70% solvent (glycerol: water (v:v) = 1:3), lactic acid-citric acid mixture (the ...
Embodiment 3
[0129] The synthesis of embodiment 3 organic boron zirconium crosslinking agent
[0130] Under the conditions of maintaining the concentration of the modified guar gum base solution at 0.7%, the pH value at 10-11, 0.6% sodium thiosulfate, and the cross-linking ratio of 100:0.6, the effect of different boron-zirconium ratios on the jelly was investigated. The influence of temperature resistance and shear resistance of glue. Anton Paar rheometer was used to measure its temperature resistance and shear resistance, and the shear rate was 170s -1 , the temperature is 160°C, observe the final viscosity of the jelly after continuous shearing for 30 minutes, and record the data for graph analysis, the results are as follows figure 1 shown. figure 1 For different BOC:ZOC values at the same heating rate with the change of shear time and the influence of crosslinking time, according to the curve, the temperature resistance of the crosslinking agent decreases with the increase of BOC:...
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