CN114773494A - Amphoteric guar gum and preparation method thereof - Google Patents
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- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
- C08B37/0087—Glucomannans or galactomannans; Tara or tara gum, i.e. D-mannose and D-galactose units, e.g. from Cesalpinia spinosa; Tamarind gum, i.e. D-galactose, D-glucose and D-xylose units, e.g. from Tamarindus indica; Gum Arabic, i.e. L-arabinose, L-rhamnose, D-galactose and D-glucuronic acid units, e.g. from Acacia Senegal or Acacia Seyal; Derivatives thereof
- C08B37/0096—Guar, guar gum, guar flour, guaran, i.e. (beta-1,4) linked D-mannose units in the main chain branched with D-galactose units in (alpha-1,6), e.g. from Cyamopsis Tetragonolobus; Derivatives thereof
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Abstract
The invention belongs to the technical field of tertiary oil recovery, and particularly relates to amphoteric guar gum and a preparation method thereof. The preparation method comprises the following specific steps: adding didodecylamine and methanol into a first reactor in sequence, adding an aqueous solution of sodium p-bromomethylbenzenesulfonate while stirring, heating and refluxing for reaction, adding concentrated hydrochloric acid, adjusting the pH to 2, cooling to below 10 ℃, separating out a solid, and filtering to obtain a white crystal; adding methanol into the crystals, adding epoxy chloropropane while stirring, heating for reflux reaction, and carrying out reduced pressure distillation to obtain a viscous liquid; adding guar gum and sodium hydroxide solution into a second reactor, stirring and reacting for 30-50min, adding the viscous liquid, heating and reacting to obtain a powdery product, washing the product with ethanol, filtering and drying to obtain the product amphoteric guar gum. The guar gum has wide raw material source, does not produce pollution and is environment-friendly; the apparent viscosity is high; the water-insoluble substances are less; strong antibacterial ability and the like.
Description
Technical Field
The invention belongs to the technical field of tertiary oil recovery, relates to a polymer for fracturing and a preparation method thereof, and particularly relates to amphoteric guar gum and a preparation method thereof.
Background
Guar gum is a natural high molecular water soluble colloid separated from guar bean seeds. Guar gum is a natural galactomannan, which is composed of (1-4) -beta-D-mannan as a main chain and single alpha-D-galactopyranose as a side chain, wherein the main chain is connected with the (1-6) bond. The substantially linear, branched structure determines the distinct difference in guar properties from those of unbranched, water-insoluble glucomannans, where galactose is randomly distributed in the backbone but in groups of two or three.
Guar gum has good water solubility, can form high-viscosity stable aqueous solution at a lower concentration, can be used as a thickening agent, a stabilizing agent, an emulsifying agent, a dispersing and suspending agent, a water-retaining agent and a gelling agent, and is applied to the fields of oil fields, paper making, medicines, daily necessities, foods, textiles, water treatment, mining explosives and the like.
The spatial structure of guar gum molecules is a spiral spherical structure, a large number of hydroxyl groups are contained in the molecules, but most of the hydroxyl groups are positioned in the molecules, and the strong intermolecular force causes the guar gum molecules to form intramolecular self-crosslinking, so that the guar gum molecules are difficult to hydrate well. Therefore, natural guar gum has certain defects in water-soluble speed, insoluble content, solution transparency, viscosity stability and the like, so that the application thereof is limited. The natural guar gum is chemically or physically modified, so that the performance of the guar gum can be effectively improved, the physicochemical characteristics of the guar gum are changed, and the application range is further enlarged.
CN 111393538A discloses a zwitter-ion hydrophobic modified guar gum, which is characterized in that: the structural formula is as follows: r1 is long chain organic acid, specifically long chain saturated acid with carbon chain of 6-14, or long chain unsaturated acid with carbon chain of 18-22; meanwhile, the invention also discloses a preparation method of the guar gum, which comprises the following steps: introducing an anionic monomer to the guar to form an anionic guar modified product; preparing and forming a water-soluble amphiphilic cationic hydrophobic monomer by taking hydrophobic long-chain, 3-dimethylaminopropylamine and epichlorohydrin as raw materials; water soluble amphiphilic cationic hydrophobic monomers are introduced into the anionic guar modified product to form an amphoteric hydrophobic modified product. According to the invention, the special electrostatic interaction of zwitterions and the hydrophobic association function are fully utilized to endow the guar gum molecular chain with special dispersibility and rheological property, so that the guar gum has excellent solubility, viscosity increasing property and temperature and salt resistance. However, the insoluble matter of the guar gum is high, so that the dissolution speed is slow, and fish eyes are easily generated in the base fluid during the preparation process, so that the quality of the fracturing fluid is reduced.
CN 104130337B discloses a method for preparing carboxymethyl hydroxypropyl guar gum powder by a guar gum sheet one-step method, which comprises the steps of adding the guar gum sheet into an organic solvent-water mixed solution, heating to 30-80 ℃, adding a sodium hydroxide solution, carrying out an alkalization reaction for 2-60 min, adding an etherifying agent after the alkalization reaction is finished, reacting for 30-180 min at 30-80 ℃, cooling after the reaction is finished, filtering, washing, crushing and drying to obtain a finished product. According to the invention, cheap guar gum sheets are used as raw materials, carboxymethyl and hydroxyalkyl etherification modification is simultaneously carried out by a one-step method, and the reaction time is greatly shortened compared with a step method; the carboxymethylation and the hydroxyalkylation are carried out simultaneously, the operation is simple and convenient, the reaction time is short, the obtained product has low water-insoluble substance content and good crosslinking performance, has good functions of making seams and carrying sand, and has good application prospect in the field of oilfield fracturing fluid. Has wide application prospect in the aspect of oilfield additives. However, from the analysis of the molecular structure of the guar gum powder, the modified guar gum has no sterilization capability, so the viscosity retention time is short, and the guar gum needs to be prepared in situ when in use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides amphoteric guar gum and a preparation method thereof. The guar gum has the advantages of wide raw material source, no pollution and environmental friendliness; the apparent viscosity is high; the water-insoluble substances are less; strong antibacterial ability and the like.
One of the objects of the present invention is to disclose an amphoteric guar gum, the molecular structural formula of which is as follows:
the invention also discloses a preparation method of the amphoteric guar gum, which comprises the following specific steps:
(1) adding didodecylamine and methanol into a first reactor in sequence, adding an aqueous solution of sodium p-bromomethylbenzenesulfonate while stirring, heating and refluxing for reaction, adding concentrated hydrochloric acid, adjusting the pH to 2, cooling to below 10 ℃, separating out a solid, and filtering to obtain a white crystal;
(2) adding methanol into the crystals, adding epoxy chloropropane while stirring, heating for reflux reaction, and carrying out reduced pressure distillation to obtain a viscous liquid;
(3) adding guar gum and sodium hydroxide solution into a second reactor, stirring and reacting for 30-50min, adding the viscous liquid, heating and reacting to obtain a powdery product, washing the product with ethanol, filtering and drying to obtain the product amphoteric guar gum.
Preferably, in step (1), the weight ratio of the didodecylamine to the aqueous solution of sodium p-bromomethylbenzenesulfonate is 1:0.7-0.8, more preferably 1: 0.72-0.78.
Preferably, in the step (1), the concentration of the sodium p-bromomethylbenzenesulfonate aqueous solution is 10 to 25 wt%, and more preferably 15 to 20 wt%.
Preferably, in step (1), the weight ratio of methanol to didodecylamine is 2-4: 1, more preferably 2.5 to 3.5: 1.
preferably, in step (1), the heating reflux reaction time is 4 to 8 hours, and more preferably 5 to 7 hours.
Preferably, in the step (2), the weight ratio of the methanol to the epichlorohydrin to the didodecylamine is 2-4: 0.26-0.3:1, more preferably 2.5-3.5:0.27-0.29: 1.
Preferably, in the step (2), the heating reflux reaction time is 4 to 8 hours, and more preferably 5 to 7 hours.
Preferably, in step (3), the weight ratio of guar gum, sodium hydroxide solution and didodecylamine is 1-1.5: 0.03-0.06: 1, more preferably 1.1-1.4:0.04-0.05: 1.
Preferably, in step (3), the concentration of the sodium hydroxide solution is 5 to 15 wt%, more preferably 8 to 12 wt%.
Preferably, in step (3), the weight ratio of ethanol to didodecylamine is 1-2: 1, more preferably 1.2 to 1.8: 1.
preferably, in the step (3), the temperature rise is 50-80 ℃, the reaction time is 6-10h, more preferably, the temperature is 60-70 ℃, and the reaction time is 7-9 h.
The reaction equation for the synthesis of amphoteric guar gum of the invention is as follows:
two long-chain alkyl groups and benzene rings are introduced into amphoteric guar gum molecules, so that the molecular weight is greatly improved, sulfonic acid anions and quaternary ammonium cations are introduced, and the characteristics of amphoteric ionic polymers and hydrophobic association polymers are combined, so that a reversible space network structure is established between guar gum aqueous solutions, the space network structure of the aqueous solutions is denser, the good dispersibility of guar gum derivatives is ensured, and the viscosity increasing degree, temperature resistance and salt resistance of the guar gum derivatives are improved. In addition, the sulfonic acid group and the quaternary ammonium cation have stronger bactericidal capacity, so that the prepared fracturing fluid has stronger antibacterial capacity.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the guar gum has wide raw material source and simple synthesis and preparation processes;
(2) the guar gum has the characteristic of high apparent viscosity, the apparent viscosity is more than 300mPa.s and can reach more than 400mPa.s at most;
(3) the insoluble substance content of the guar gum water is low, is lower than 3.5 percent, and is as low as below 3.0 percent; the guar gum disclosed by the invention has strong antibacterial performance, and the viscosity retention rate after 120 hours reaches more than 90% and reaches more than 92% at most.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
Example 1
(1) Adding 100g of didodecylamine and 200g of methanol into a first reactor in sequence, adding 70g of 10 wt% aqueous solution of sodium p-bromomethylbenzenesulfonate while stirring, heating and refluxing for 4 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) And adding 200g of methanol into the crystals, adding 26g of epoxy chloropropane while stirring, heating and refluxing for reaction for 4 hours, and carrying out reduced pressure distillation to obtain a viscous liquid.
(3) Adding 100G of guar gum and 3G of 5 wt% sodium hydroxide solution into a second reactor, stirring for reaction for 30min, adding the viscous liquid, heating to 50 ℃, keeping the temperature for reaction for 6h, filtering, washing with 100G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G1。
Example 2
(1) Adding 100g of didodecylamine and 400g of methanol into a first reactor in sequence, adding 80g of 20 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for 8 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) Adding 400g of methanol into the crystals, adding 30g of epoxy chloropropane while stirring, heating and refluxing for reaction for 8 hours, and carrying out reduced pressure distillation to obtain a viscous liquid.
(3) Adding 148g of guar gum and 6g of 10 wt% sodium hydroxide solution into a second reactor, stirring for reaction for 40min, adding the viscous liquid, heating to 80 ℃, keeping the temperature for reaction for 10h, filtering, washing with 190g of ethanol, filtering,drying to obtain the product amphoteric guar gum G2。
Example 3
(1) Adding 100g of didodecylamine and 310g of methanol into a first reactor in sequence, adding 72g of 25 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for 5 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) Adding 250g of methanol into the crystals, adding 29g of epoxy chloropropane while stirring, heating and refluxing for reaction for 5 hours, and distilling under reduced pressure to obtain a viscous liquid.
(3) Adding 121G of guar gum and 3.5G of 15 wt% sodium hydroxide solution into a second reactor, stirring for reaction for 50min, adding the viscous liquid, heating to 60 ℃, keeping the temperature for reaction for 9h, filtering, washing with 130G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G3。
Example 4
(1) Adding 100g of didodecylamine and 285g of methanol into a first reactor in sequence, adding 75g of 20 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for reaction for 7 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) Adding 298g of methanol into the crystal, adding 28g of epoxy chloropropane while stirring, heating and refluxing for reaction for 7 hours, and distilling under reduced pressure to obtain a viscous liquid.
(3) Adding 132G of guar gum and 4.2G of 12 wt% sodium hydroxide solution into a second reactor, stirring for reacting for 35min, adding the viscous liquid, heating to 63 ℃, keeping the temperature for reacting for 7h, filtering, washing with 160G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G4。
Example 5
(1) Adding 100g of didodecylamine and 368g of methanol into a first reactor in sequence, adding 73g of a 15 wt% aqueous solution of sodium p-bromomethylbenzenesulfonate while stirring, carrying out heating reflux reaction for 6 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) 286g of methanol is added into the crystals, 27g of epoxy chloropropane is added while stirring, the mixture is heated and refluxed for reaction for 7 hours, and the viscous liquid is obtained by reduced pressure distillation.
(3) Adding 134G of guar gum and 5G of 8 wt% sodium hydroxide solution into a second reactor, stirring for reaction for 45min, adding the viscous liquid, heating to 73 ℃, keeping the temperature for reaction for 6.5h, filtering, washing with 149G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G5。
Example 6
(1) Adding 100g of didodecylamine and 276g of methanol into a first reactor in sequence, adding 77g of 18 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for 5 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) 325g of methanol is added into the crystal, 28g of epoxy chloropropane is added while stirring, the mixture is heated and refluxed for reaction for 5 hours, and the viscous liquid is obtained by reduced pressure distillation.
(3) Adding 124G of guar gum and 5.3G of 10 wt% sodium hydroxide solution into a second reactor, stirring for reacting for 40min, adding the viscous liquid, heating to 64 ℃, keeping the temperature for reacting for 8h, filtering, washing with 144G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G6。
Example 7
(1) Adding 100g of didodecylamine and 302g of methanol into a first reactor in sequence, adding 78g of 17 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for 5 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) And adding 324g of methanol into the crystals, adding 27g of epoxy chloropropane while stirring, heating and refluxing for reaction for 4.5 hours, and carrying out reduced pressure distillation to obtain a viscous liquid.
(3) Adding 100G of guar gum and 4.8G of 12 wt% sodium hydroxide solution into a second reactor, stirring for reacting for 45min, adding the viscous liquid, heating to 55 ℃, keeping the temperature for reacting for 7.5h, filtering, washing with 175G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G7。
Example 8
(1) Adding 100g of didodecylamine and 301g of methanol into a first reactor in sequence, adding 76g of 14 wt% sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating and refluxing for 6 hours, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain white crystals.
(2) And adding 295g of methanol into the crystals, adding 28g of epoxy chloropropane while stirring, heating and refluxing for reaction for 6 hours, and carrying out reduced pressure distillation to obtain a viscous liquid.
(3) Adding 126G of guar gum and 5.5G of 13 wt% sodium hydroxide solution into a second reactor, stirring for reacting for 35min, adding the viscous liquid, heating to 69 ℃, keeping the temperature for reacting for 8h, filtering, washing with 200G of ethanol, filtering, and drying to obtain the product amphoteric guar gum G8。
Test example 1 measurement of apparent viscosity
The evaluation method refers to SY/T5764-2007 general technical requirements of vegetable gum for fracturing
Weighing 500ml of distilled water in a mixer, starting at a low speed, slowly adding 3.00g of rubber powder, and regulating the voltage to the range
Stirring for 5min, pouring the rubber powder solution into a beaker, covering, placing in a water bath at 30 ℃, keeping the temperature for 4h, and testing the apparent viscosity. The apparent viscosity test results are shown in table 1.
Test example 2 measurement of Water-insoluble substance
The evaluation method refers to SY/T5764-2007 general technical requirements for vegetable gum for fracturing
Weighing 500ml of distilled water in a mixer, starting at a low speed, slowly adding 2.00g of rubber powder, and regulating the voltage to the range
Stirring for 5min, pouring the rubber powder solution into a beaker, covering, placing in a water bath at 30 ℃, and keeping the temperature for 4 h. Weighing 50.20g of the rubber powder solution in a constant centrifuge tube, placing the centrifuge tube in a centrifuge, and centrifuging at the rotating speed of 3000r/minPouring out supernatant liquor after 30 min; adding distilled water to 50ml, stirring and washing with a glass rod, centrifuging for 20min, pouring out the upper solution, placing the centrifuge tube in a constant temperature drying oven at 105 ℃, and drying to constant volume.
In the formula:
eta-water-insoluble substance of the rubber powder, expressed by percentage;
m 1-mass of centrifuge tube in grams (g);
m 2-total mass of centrifuge tube and water insoluble material in grams (g);
w is the water content of the rubber powder, expressed in percentage;
0.20-mass of gelatine powder in solution, in grams (g).
The results of the water insoluble content test are shown in Table 1.
Test example 3 test of antibacterial ability
The evaluation method refers to Q/SH 10250784-2011 technical conditions for bactericide for fracturing
Preparing a base liquid: 1000ml of tap water is measured and poured into the Wuyi mixing and blending device, and the rotating speed of the Wuyi mixing and blending device is adjusted until the vortex formed by liquid can be seen from the top end of a paddle center shaft of the mixing and blending device. Then 5g (to the nearest 0.001g) of guar gum was slowly added to form a homogeneous solution, the stirring was stopped and the solution was left to stand in an electric thermostatic incubator at 30 ℃.
Preparation of jelly: weighing 70ml of the base solution, pouring the base solution into a 100ml beaker, sequentially adding 0.35ml of high-temperature fracturing stabilizer and 0.30ml of liquid sodium hydroxide under the stirring of a glass rod, uniformly stirring, and then adding 0.35ml of cross-linking agent while stirring until uniform gel capable of being hung is formed.
And (3) viscosity measurement: the base fluids with constant temperature of 4h and 120h are respectively prepared into jelly glue, then the jelly glue is put into an RT20 type rheometer, and the temperature resistance and the shearing resistance of the fracturing fluid are measured according to 6.6 in SY/T5107-2005 water-based fracturing fluid performance evaluation method. The temperature was set at 120 ℃ and the rotor was set at a shear rate of 170s-1Lower shear 90And (5) taking the average value of the apparent viscosities corresponding to the last 10min of shearing as the apparent viscosity of the jelly.
In the formula:
r-antibacterial ability,%;
eta 1-apparent viscosity of the jelly at constant temperature of 4h, wherein the unit is mPa & s;
eta 2-apparent viscosity of the base solution in mPas at constant temperature for 120 h.
The results of the test for antibacterial ability are shown in table 1.
TABLE 1 guar gum apparent viscosity, water insoluble, antibacterial ability test results
| Guar gum | Apparent viscosity, mPas | Water-insoluble matter of% | Antibacterial ability,% |
| G1 | 321 | 3.29 | 90.2 |
| G2 | 342 | 3.19 | 90.5 |
| G3 | 332 | 3.04 | 91.0 |
| G4 | 358 | 3.08 | 91.2 |
| G5 | 378 | 2.99 | 91.7 |
| G6 | 369 | 2.92 | 91.3 |
| G7 | 387 | 2.94 | 92.3 |
| G8 | 405 | 2.87 | 92.8 |
| Before transformation | 181 | 5.75 | 36.8 |
As can be seen from table 1:
(1) the apparent viscosity of the amphoteric guar gum is more than 320 mPas, wherein G8The highest viscosity reaches 405 mPas, the apparent viscosity of the guar gum before reconstruction is 181 mPas, and the apparent viscosity of the guar gum is obviously higher than that of the guar gum before reconstruction and averagely higher than 180 mPas. Compared with the prior product, the amphoteric guar gum has good apparent viscosity performance.
(2) The content of insoluble substances in the amphoteric guar gum is lower than 3.5 percent, wherein G is1The maximum content is 3.29 percent, G8The minimum content of the guar gum is 2.87 percent, the content of the insoluble substances of the guar gum before modification is 5.75 percent, and the content of the insoluble substances of the guar gum is obviously lower than that of the guar gum before modification and is averagely lower than more than 2.5 percent.
(3) The antibacterial capacity of the amphoteric guar gum is more than 90 percent, wherein G1Minimum 90.2%, G8The highest is 92.8 percent, and the antibacterial capacity of the guar gum before modification is 36.8 percent, and the antibacterial capacity of the guar gum of the invention is obviously higher than that of the guar gum before modification by more than 50 percent on average. Compared with the existing products, the amphoteric guar gum has stronger antibacterial ability.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including various technical features being combined in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The preparation method of the amphoteric guar gum is characterized by comprising the following specific steps:
(1) adding didodecylamine and methanol into a first reactor in sequence, adding a sodium p-bromomethylbenzenesulfonate aqueous solution while stirring, heating for reflux reaction, adding concentrated hydrochloric acid, adjusting the pH to 2, simultaneously cooling to below 10 ℃, precipitating a solid, and filtering to obtain a white crystal;
(2) adding methanol into the crystals, adding epoxy chloropropane while stirring, heating for reflux reaction, and carrying out reduced pressure distillation to obtain a viscous liquid;
(3) adding guar gum and sodium hydroxide solution into a second reactor, stirring and reacting for 30-50min, adding the viscous liquid, heating and reacting to obtain a powdery product, washing the product with ethanol, filtering and drying to obtain the product amphoteric guar gum.
2. The method according to claim 1, wherein in the step (1), the weight ratio of the didodecylamine to the aqueous solution of sodium p-bromomethylbenzenesulfonate is 1: 0.7-0.8.
3. The method according to claim 1, wherein in the step (1), the concentration of the aqueous solution of sodium p-bromomethylbenzenesulfonate is 10 to 25 wt%.
4. The method according to claim 1, wherein in the step (1), the heating reflux reaction time is 4 to 8 hours.
5. The process according to claim 1, wherein in the step (2), the weight ratio of methanol to epichlorohydrin to didodecylamine is 2-4: 0.26-0.3:1.
6. The method according to claim 1, wherein in the step (2), the heating reflux reaction time is 4 to 8 hours.
7. The preparation method according to claim 1, wherein in the step (3), the weight ratio of the guar gum, the sodium hydroxide solution and the didodecylamine is 1-1.5: 0.03-0.06: 1.
8. the method according to claim 1, wherein in the step (3), the weight ratio of ethanol to didodecylamine is 1-2: 1.
9. the method according to claim 1, wherein in the step (3), the temperature is raised to 50-80 ℃ and the reaction time is 6-10 hours.
10. Amphoteric guar obtained by the process according to any one of claims 1 to 9, characterized in that it has the following molecular formula:
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Cited By (3)
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|---|---|---|---|---|
| CN115894733A (en) * | 2022-11-23 | 2023-04-04 | 昆山京昆油田化学科技有限公司 | Sulfur-containing modified guar gum and preparation method and application thereof |
| CN116655828A (en) * | 2023-04-04 | 2023-08-29 | 胜利油田凯渡石油技术开发有限公司 | Modified guar gum for fracturing and preparation method thereof |
| CN117088993A (en) * | 2023-10-18 | 2023-11-21 | 东营市宝泽能源科技有限公司 | Guar gum for oilfield fracturing and preparation method thereof |
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| CN115894733A (en) * | 2022-11-23 | 2023-04-04 | 昆山京昆油田化学科技有限公司 | Sulfur-containing modified guar gum and preparation method and application thereof |
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| CN116655828A (en) * | 2023-04-04 | 2023-08-29 | 胜利油田凯渡石油技术开发有限公司 | Modified guar gum for fracturing and preparation method thereof |
| CN117088993A (en) * | 2023-10-18 | 2023-11-21 | 东营市宝泽能源科技有限公司 | Guar gum for oilfield fracturing and preparation method thereof |
| CN117088993B (en) * | 2023-10-18 | 2024-02-02 | 东营市宝泽能源科技有限公司 | Guar gum for oilfield fracturing and preparation method thereof |
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