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Long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent and preparation method thereof

A long-chain alkyl polyoxyethylene based technology, long-chain alkyl polyoxyethylene technology, applied in the field of guar gum derivatives, can solve the problems of low reaction efficiency, precipitation, corrosive price, etc., and achieve product properties The effects of uniformity, mild reaction conditions, and increased contact probability

Inactive Publication Date: 2019-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, brominated alkanes are mostly used for hydrophobic modification in China, such as Li Xueping et al. ) has reported that natural guar gum is hydrophobized and modified with hexadecane bromide as the hydrophobic modification monomer, and the prepared hydrophobic guar gum has better overall performance, and the stability of the modified guar gum solution is compared with the guar gum aqueous solution Greatly improved, but the reaction efficiency of brominated alkanes is low, corrosive and expensive, long-chain alkenyl succinic anhydride or long-chain alkyl / alkenyl amides introduce complex groups, and alkyl glycidyl ether products are easy to handle and can prevent further reaction
Alkyl glycidyl ethers are often used abroad, such as R Lapasin et al. (Lapasin R, LdeL, PriclS, et al. Flow properties of hydroxypropyl guar gum and its long-chainhydrophobic derivatives. [J]. Carbohydrate Polymers, 1995, 28 (3 ): 195-202.) studied the rheological properties of the hydroxypropyl guar gum derivatives of grafted glycidyl behenyl ether, wherein the glycidyl behenyl docosyl linear alkane, exists Strong hydrophobicity, difficult to control the grafting rate, easy to cause precipitation
And, the hydrophobic modification of guar gum in the prior art generally all carries out suspension reaction in the mixed solvent of a kind of low molecular weight alcohol and water at present, as: isopropanol, methyl alcohol, ethanol, ethylene glycol etc. and water Mixture, because the reactant can only react at the two-phase interface, so the reaction efficiency is low; in addition, in the prior art, the reaction mostly uses strong inorganic bases as catalysts, and the reaction temperature is generally at 50-80 ° C, which inevitably leads to the formation of guar gum. The macromolecular chain segment is broken, which greatly reduces the viscosity of guar gum after modification, thus weakening its application performance

Method used

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  • Long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent and preparation method thereof
  • Long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent and preparation method thereof
  • Long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Dissolve 0.0089 mol (5.89 g) of polyoxyethylene (10) cetyl ether in anhydrous toluene, and remove water azeotropically. Under the protection of nitrogen, add 0.044mol (1.05g) sodium hydride to the flask, then add 58mL of anhydrous toluene, then re-dissolve the dehydrated Benzene in 30mL of anhydrous toluene, add to the flask, and stir for 1h. Then 0.0623mol (3.60g) of propylene oxide was added to the reactant, and reacted at 30°C for 5h. The mixture was placed in a refrigerator at 4°C overnight to separate the solid and liquid. The liquid was carefully separated and the toluene was distilled off under reduced pressure to obtain the product polyoxyethylene (20) cetyl ether glycidyl ether (code name Brij56-epoxide xm09-214), which was sample 1. The product was obtained without further purification in 95% yield. The product Brij56-epoxidexm09-214 was dissolved in deuterated chloroform (CDCl 3 ), and then carry out the proton nuclear magnetic resonance spectrum analysis,...

Embodiment 2

[0045] Dissolve 1 g of guar gum in 100 g of water and stir for 8 hours. Tetrabutylammonium hydroxide (TBAOH) was added, the molar ratio of TBAOH to guar unit was 5, stirred at room temperature for 1 hour, and the solution was freeze-dried. Put the freeze-dried solid into 100g of dimethyl sulfoxide (DMSO), stir at room temperature for 1 hour, then add long-chain alkyl polyoxyethylene glycidyl ether sample 1, long-chain alkyl polyoxyethylene The molar ratio of glycidyl ether to guar gum was 0.2. Stir at room temperature for 1 day. The above-mentioned reactant was diluted with 10g of water, then packed into a dialysis bag, and the dialysis bag was put into 1000g of water / ethanol (50:50v / v) mixture, stirred and dialyzed, and the water / ethanol (50:50v / v) was changed every 6 hours. v) The mixture was changed 2 times in total, and then dialyzed in 1000 g of water, changing the water every 6 hours, 2 times in total. The dialyzed solution was transferred from the dialysis bag to a r...

Embodiment 3

[0047] 1 g of guar gum was dissolved in 20 g of water and stirred for 24 hours. Add tetrabutylammonium hydroxide (TBAOH), the molar ratio of TBAOH to guar unit is 1, stir at room temperature for 1 hour, and freeze-dry the solution. Put the freeze-dried solid into 20 g of dimethyl sulfoxide (DMSO), stir at room temperature for 8 hours, then add long-chain alkyl polyoxyethylene glycidyl ether sample 1, long-chain alkyl polyoxyethylene The molar ratio of glycidyl ether to guar gum was 0.01, and stirred at room temperature for 8 days. The above-mentioned reactant was diluted with 100g of water, then packed into a dialysis bag, and the dialysis bag was put into 1000g of water / ethanol (50:50v / v) mixture, stirred and dialyzed, and the water / ethanol (50:50v / v) was changed every 3 hours. v) The mixture was changed 3 times in total, and then dialyzed in 1000 g of water, changing the water every 3 hours, 3 times in total. The dialyzed solution was transferred from the dialysis bag to a...

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Abstract

The invention relates to a long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent used in oil field crushing and a preparation method thereof, belonging to the technical field of guar gum derivatives. The long-chain alkyl polyoxyethylene hydrophobically modified guar gum thickening agent is prepared from the following raw material components: (a) guar gum and (b) long-chain alkyl polyoxyethylene glycidyl ether, wherein molar ratio of long-chain alkyl polyoxyethylene glycidyl ether to the guar gum is (0.01-0.5) to 1 and is preferably (0.05-0.2) to 1; and long-chainalkyl polyoxyethylene glycidyl ether is autonomously synthesized brij type glycidyl ether. Besides, homogeneous reaction is carried out at the room temperature by utilizing dimethyl sulfoxide as a solvent and quaternary ammonium base as a catalyst, the reaction condition is mild, and the reaction efficiency is high, the thickening property of an obtained long-chain alkyl polyoxyethylene hydrophobically modified guar gum product is remarkably improved, and the thickening agent has good application prospects.

Description

technical field [0001] The invention relates to the technical field of guar gum derivatives used in oil field fracturing, and furthermore, relates to a long-chain alkyl polyoxyethylene-based hydrophobically modified guar gum thickener and a preparation method thereof. Background technique [0002] Guar gum is widely used in oil fields, printing and dyeing, food, daily chemical and other industries, but guar collagen powder cannot quickly swell and hydrate, dissolves slowly, has high water insoluble content, difficult to control viscosity, poor shear resistance, and is easy to deteriorate and other shortcomings, so it is often necessary to obtain performance-improved guar gum derivatives through chemical modification such as etherification, oxidation, and esterification, such as hydroxypropyl guar gum, guar gum, carboxymethyl hydroxypropyl guar gum, etc. . [0003] The hydrophobic modification of guar gum is mainly through three types of reagents: brominated long-chain alkan...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08B37/00C09K8/68C09K8/90
CPCC08B37/0096C08G81/00C09K8/68C09K8/90
Inventor 苗霞初永涛刘仍光张晋凯汪晓静刘伟
Owner CHINA PETROLEUM & CHEM CORP
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