Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of modified welan gum

A Welan gum and modification technology, which is applied in the field of preparation of modified Welan gum, can solve the problems of low effective viscosity and poor ability to co-sand, and achieve the effect of solving poor water solubility and enhancing viscosity

Active Publication Date: 2014-11-19
NANJING UNIV OF TECH
View PDF1 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The viscosity of Welan gum itself is only 0.765pa.s, and the effective viscosity is not high (the ability to co-sand is not good)

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of modified welan gum
  • Preparation method of modified welan gum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a three-necked flask, take Welan gum and dissolve it in water to prepare an aqueous solution with a concentration of 10g / L, and stir at a speed of 450rpm to allow it to fully dissolve; in the aqueous solution prepared by 11-bromoundecanoic acid and potassium acetate, Wherein, the concentration of 11-bromoundecanoic acid is 1g / L, and the concentration of potassium acetate is 1g / L, and the quality of controlling Welan gum: 11-bromoundecanoic acid is 10:1; The aqueous solution made of bromoundecanoic acid and potassium acetate was added dropwise at a constant speed; reacted at normal pressure, 60°C, 450rpm under stirring conditions for 1h, collected the reaction solution, poured it into absolute ethanol to precipitate the product, washed, and heated at 40°C drying and crushing to obtain the modified Welan gum product. The product was dissolved in 400mL of 2wt% KCl solution and dissolved within 2h. Take the product and configure it into a 0.7wt% aqueous solution, and th...

Embodiment 2

[0033] In a three-necked flask, take Welan gum and dissolve it in water to prepare an aqueous solution with a concentration of 5g / L, and stir it at a speed of 500rpm to allow it to fully dissolve; in the aqueous solution prepared by 11-bromoundecanoic acid and potassium carbonate, Wherein, the concentration of 11-bromoundecanoic acid is 2g / L, and the concentration of potassium carbonate is 5g / L, and the quality of controlling Welan gum: 11-bromoundecanoic acid is 5:2; The aqueous solution made of bromoundecanoic acid and potassium carbonate was added dropwise at a constant speed; reacted at normal pressure, 55°C, 500rpm under stirring conditions for 3h, collected the reaction solution, poured it into absolute ethanol to precipitate the product, washed, and heated at 45°C drying and crushing to obtain the modified Welan gum product. The product was dissolved in 400mL of 2wt% KCl solution and dissolved within 2h. The product was configured into a 0.7wt% aqueous solution, and th...

Embodiment 3

[0035] In a three-necked flask, take Welan gum and dissolve it in water to prepare an aqueous solution with a concentration of 10g / L, and stir it at a speed of 550rpm to fully dissolve it; in the aqueous solution prepared by 11-bromoundecanoic acid and sodium hydroxide , wherein, the concentration of 11-bromoundecanoic acid is 5g / L, and the concentration of sodium hydroxide is 6g / L, and the mass ratio of controlling Welan gum: 11-bromoundecanoic acid is 2:1; The aqueous solution made of 11-bromoundecanoic acid and sodium hydroxide was added dropwise at a constant speed; reacted at normal pressure, 80°C, and stirred for 6 hours, collected the reaction liquid, poured it into absolute ethanol to precipitate the product, washed it, and Dry at 50°C and pulverize to obtain the modified Welan gum product. The product was dissolved in 400mL of 2wt% KCl solution and dissolved within 2h. The product was prepared as a 0.7wt% aqueous solution, and the measured viscosity was 0.879pa.s.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of modified welan gum. According to the invention, under a stirring condition, welan gum is dissolved in water; a water solution prepared by using 11-bromo undecanoic acid and a catalyst is dropped into the welan gum water solution; a reaction is allowed for 1-6h under stirring under a normal pressure and a temperature of 50-80 DEG C; a reaction liquid is collected and is added into anhydrous ethanol, such that a product is precipitated; and the product is washed, dried, and crushed, such that the modified welan gum product is obtained. According to the invention, long chain is introduced into welan gum, such that welan gum viscosity is improved.

Description

technical field [0001] The invention belongs to a method for modifying microbial polysaccharides, in particular to a method for preparing modified welan gum. Background technique [0002] Welan gum is a high molecular polysaccharide biopolymer produced by fermentation of corn starch. Its main chain structure is composed of units of D-glucose, D-glucuronic acid, D-glucose and L-rhamnose, and the side chain is composed of single-chain L-mannose or single-chain L-rhamnose Composition, the molecular weight is as high as several million. Its structure is close to that of guar gum. In the structure of guar gum, D-mannose is the main chain, and the side chain is galactose. According to different origins, the molecular weight is distributed between 200,000 and 2 million. [0003] As an excellent fracturing fluid, the following must be met: [0004] ① It requires a certain viscosity, that is, the ability to carry sand. [0005] ②It cannot cause large construction friction, that i...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08B37/00
Inventor 郭凯赵李欢李昕欧阳平凯
Owner NANJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com