Patent ID: 9243180
Filing Date: 2016-01-26
CPC Classification: C09K

Claim Text:
1. A filtration control agent comprising: the product obtained from the reaction of water, a substance containing humic acid and/or modified humic acid, an aldehyde, and a sulfonate polymer at 180-220° C., and wherein the units containing sulfonate groups in the molecular chains of the sulfonate polymer are at least 30 wt %; on the basis of 100 parts by weight of water, the dosage of the substance containing humic acid and/or modified humic acid is 10-70 parts by weight, the dosage of the aldehyde is 0.5-20 parts by weight, the dosage of the sulfonate polymer is 2-30 parts by weight; the substance containing humic acid and/or modified humic acid comprises one or more selected from the group consisting of sulfonated lignite, walchowite, sodium humate, potassium humate, and nitric acid modified humic acid; the sulfonate polymer has at least one of the structures shown in Formula (I)-Formula (III): where M is Na + or K + ; R is H or CH 3 ; n is 0, 1 or 2; a, b, and c denote the molar numbers of the corresponding structural units, wherein b:c=1:5-60.