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US 11,078,410 B2Granted
Modified reactive resin compositions and use thereof for coating propping agents
AssigneeWacker Chemie AG
InventorsSebastian Knoer, Daniel Calimente, Arndt Schlosser
Life of this patent
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Abstract
Coated proppants useful in fracking operations in oil and gas production are coated with a novolac resin containing a linear or cyclic organopolysiloxane of specific composition. The coatings are more fracture resistant, thus producing less fines during use, resulting in longer production campaigns.
Claims7
A reactive resin composition, comprising:
- (A) 80%-99.8% by weight of at least one reactive phenol novolac resin, and
- (B) 0.2%-20% by weight of at least one linear or cyclic organopolysiloxane,
- wherein the weight percentages of (A) and (B) are based on the total weight of the reactive resin composition, and
- (C) optionally, a hardening agent,
- with the provisos that:
- (B) has at least 3 successive Si—O units;
- (B) has at least one Si—C-bonded, pendant or terminal organic R1 radical, where
- R1 contains at least 6 atoms independently selected from the group consisting of C, N, P, O and S, and
- at least 3 of these atoms in R1 are C;
- in (B) the ratio of the sum total of all carbon atoms to the sum total of all silicon atoms is at least 3;
- (B) is in free-flowing form at 20° C., or is convertible to free-flowing form by heating to a temperature in a range of up to 250° C.;
- and
- in (B) when R1 is polymeric, it is a polymer selected from the group consisting of polyethers, polycaprolactones, polyesters, polyvinyl acetates, polystyrenes, polymethylmethacrylates, and mixtures thereof.
10 more elements
A reactive resin composition, comprising:
- (A) 80%-99.8% by weight of at least one reactive phenol novolac resin, and
- (B) 0.2%-20% by weight of at least one linear or cyclic organopolysiloxane, wherein the weight percentages of (A) and (B) are based on the total weight of the reactive resin composition, and
- (C) optionally a hardening agent,
- with the provisos that:
- (B) has at least 3 successive Si—O units;
- (B) has at least one Si—C-bonded, pendant or terminal organic R1 radical, where
- R1 contains at least 6 atoms independently selected from the group consisting of C, N, P, O and S, and
- at least 3 of these atoms in R1 are C;
- in (B) the ratio of the sum total of all carbon atoms to the sum total of all silicon atoms is at least 3;
- (B) is in free-flowing form at 20° C., or is convertible to free-flowing form by heating to a temperature in a range of up to 250° C.;
- and
- wherein at least one R1 comprises an epoxy radical;
- an amino radical of the formula
- —R6—[NR7—R8—]nNR72 (VIII)
- where
- R6 is a divalent linear or branched hydrocarbyl radical having 3 to 18 carbon atoms,
- R7 is a hydrogen atom, an alkyl radical having 1 to 8 carbon atoms or an acyl radical,
- R8 is a divalent hydrocarbyl radical having 1 to 6 carbon atoms,
- n is 0, 1, 2, 3 or 4;
- or a carboxyalkyl radical.
17 more elements
Dependencies are inferred from the claim text.