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Preparation method of esterification modified xanthan gum

A technology of esterification modification and xanthan gum, which is applied in the field of polymer chemistry and polymer modification, can solve environmental pollution and other problems, and achieve the effects of simple post-processing, convenient storage and low cost

Active Publication Date: 2014-11-05
烟台东方神州生物技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After 90 days of high-temperature aging for oil production, the viscosity dropped from the original 340mPa.s to 156mPas, and the viscosity retention rate was as high as 45.9%, but the modifier was a chlorinated hydrocarbon (benzyl chloride) containing a benzene ring The degradation products of glue are easy to cause great pollution to the environment

Method used

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  • Preparation method of esterification modified xanthan gum
  • Preparation method of esterification modified xanthan gum
  • Preparation method of esterification modified xanthan gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 5.6 g of vacuum-dried xanthan gum was added to 120 ml of DMSO, and the mixture was fully stirred and swollen at 40 °C for 12 h. Dissolve 0.4 g of PMAO in 30 ml of chloroform, add dropwise to the reaction system with a constant pressure dropping funnel, heat up to 70 °C, and react for 16 h. After the reaction was completed, it was cooled to room temperature, the reaction solution and the solid product were added to 350 ml of acetone, and the supernatant was discarded after fully stirring. The solid product was washed 4 times with ethanol precipitation, each 400ml. After suction filtration, the product was vacuum-dried at 25°C for 48h to obtain 5.45g of modified xanthan gum. After static light scattering test, its weight average molecular weight is 4.12 million.

[0040]The salt resistance test was carried out on the xanthan gum before modification and the xanthan gum obtained after esterification modification in this example, and the salt used was NaCl. Prepare salt s...

Embodiment 2

[0053] As described in Example 1, the difference is that in step (2), the amount of xanthan gum is changed to 8 g to obtain 7.63 g of modified xanthan gum. The weight-average molecular weight of the modified xanthan gum was measured by static light scattering to be 2.92 million.

Embodiment 3

[0055] As described in Example 1, the difference is that in step (3), the amount of PMAO is changed to 0.1 g to obtain 5.39 g of modified xanthan gum. The weight-average molecular weight of the modified xanthan gum was measured by static light scattering to be 2.63 million.

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Abstract

The invention relates to esterification modified xanthan gum and its preparation method. The method is as follows: in a mixed solvent of dimethyl sulfoxide (DMSO) and chloroform, PMAO is used as a modifier and an esterification reaction is carried out between maleic anhydride group in the PMAO and hydroxide radical (-OH) in xanthan gum molecules so as to obtain the esterification modified xanthan gum. The method provided by the invention has advantages as follows: reaction condition is mild; the raw materials are easily available; conversion rate of reactants is high; and product aftertreatment is convenient. The modified xanthan gum has better temperature resistance, salt resistance and ageing resistance. Meanwhile, the modified xanthan gum is biodegradable, and the degradation product causes no pollution to the environment. The esterification modified xanthan gum is a nontoxic and environmentally friendly material.

Description

technical field [0001] The invention relates to an esterified modified xanthan gum and a preparation method thereof, belonging to the technical field of polymer chemistry and polymer modification. Background technique [0002] Xanthan gum, also known as xanthan gum, xanthan gum, is a microbial exopolysaccharide produced by the fermentation of Xanthomonas spp. It was studied by the U.S. Department of Agriculture in northern Peoril, Illinois in the 1950s. It was first discovered and commercialized in 1964. [0003] Xanthan gum is connected with D-glucose through β-1,4-glycosidic bonds to form a main chain, and every two glucose residues on the main chain are connected to a branched chain formed by three sugar molecules, mannose, glucuronic acid and mannose. The two mannose molecules attached to the branch are acetylated or pyruvylated, respectively. The skeleton structure of xanthan gum is similar to cellulose, but because the side chain of xanthan gum contains -COO - , -OH...

Claims

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Application Information

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IPC IPC(8): C08B37/00C08G81/02
Inventor 谭业邦王小金王晓藜
Owner 烟台东方神州生物技术有限公司
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