A kind of preparation method of improving the free fiber silk of sodium carboxymethyl cellulose aqueous solution

A technology of carboxymethyl cellulose and sodium aqueous solution, which is applied in the field of preparation of carboxymethyl cellulose sodium, can solve the problems of cellulose, etc., and achieve the effects of prolonging reaction time, increasing production cost, and improving free fiber content

Active Publication Date: 2017-03-15
CHONGQING LIHONG FINE CHEM
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the alkalization process usually needs to be carried out at a relatively low temperature, generally controlled below 35°C, so as to reduce the reaction rate and make the alkalization reaction proceed evenly and smoothly.
[0004] However, the alkalization reaction at a lower temperature requires a longer reaction time to complete the alkalization reaction, and the free fiber content in the product aqueous solution is higher, that is to say, even if the alkalization time is increased, the material that has not been alkalized completely There are still a lot of water-insoluble cellulose, which limits the application of sodium carboxymethyl cellulose in fields with high requirements for free fiber filaments, such as food industry, pharmaceutical industry and other application fields

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the shredded refined cotton and wood pulp, 1.1 times the cellulose mass fraction of 50% sodium hydroxide aqueous solution and 1.4 times the cellulose mass ethanol aqueous solution into the kneader at the same time, remove the air in the kneader, and make the vacuum reach 0.07MPa, fill helium into the kneader, the pressure reaches 0.02MPa, and repeat the above vacuuming and helium filling operations 2-3 times, stir and alkalize for 60 minutes, and the temperature of the alkalization process is controlled at 45-50°C; Within 60 minutes, spray the ethanol solution of chloroacetic acid with 1.25 times the mass of cellulose evenly into the kneader. When the ethanol solution of chloroacetic acid is added, the temperature of the entire reaction system is maintained at 30-60°C, and the temperature is gradually raised to 75-80°C. Continue to react for 40 minutes to obtain crude sodium carboxymethyl cellulose, after washing, neutralization, centrifugation, drying and pulverizin...

Embodiment 2

[0023] Put shredded refined cotton and wood pulp, 1.9 times the cellulose mass fraction of 40% sodium hydroxide aqueous solution and 1.6 times the cellulose mass ethanol aqueous solution into the kneader at the same time, remove the air in the kneader, and make the vacuum degree reach 0.07 MPa, fill the kneader with argon gas, the pressure reaches 0.02MPa, and repeat the above vacuuming and argon filling operations 2-3 times, stir and alkalize for 70 minutes, and the temperature of the alkalization process is controlled at 45-50°C; at 60 Within minutes, spray the ethanol solution of chloroacetic acid with 1.5 times the mass of cellulose evenly into the kneader. When adding the ethanol solution of chloroacetic acid, the temperature of the whole reaction system is maintained at 30-60°C, and the temperature is gradually raised to 75-80°C. React for 50 minutes to obtain crude sodium carboxymethyl cellulose, after washing, neutralization, centrifugation, drying, and pulverization, t...

Embodiment 3

[0025] Put shredded refined cotton and wood pulp, 1.6 times the cellulose mass fraction of 35% sodium hydroxide aqueous solution and 1.8 times the cellulose mass ethanol aqueous solution into the kneader at the same time, remove the air in the kneader, and make the vacuum degree reach 0.07 MPa, fill the kneader with neon gas, the pressure reaches 0.02MPa, and repeat the above vacuuming and neon gas filling operations 2-3 times, stir and alkalize for 100 minutes, the temperature of the alkalization process is controlled at 45-50°C; at 60 Within minutes, spray the ethanol solution of chloroacetic acid with 1.32 times the mass of cellulose evenly into the kneader. When the ethanol solution of chloroacetic acid is added, the temperature of the entire reaction system is maintained at 30-60°C, and the temperature is gradually raised to 75-80°C. React for 70 minutes to obtain crude sodium carboxymethyl cellulose, after washing, neutralization, centrifugation, drying and pulverization,...

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

No PUM Login to view more

Abstract

The invention relates to a preparation method of sodium carboxymethyl cellulose, aiming at providing a preparation method of the sodium carboxymethyl cellulose for improving a free fiber yarn contained in a water solution. The preparation method for improving the free fiber yarn contained in a sodium carboxymethyl cellulose water solution comprises the following steps: respectively crushing purified cotton and wood pulp, and successively adding the crushed purified cotton and wood pulp to a kneader with a sodium hydroxide water solution and an ethanol water solution together; vacuumizing the kneader, filling an inert gas, and carrying out alkalization reaction at constant temperature of 38-50 DEG C for 40-120 minutes; adding an etherifying agent, increasing temperature to 75-80 DEG C, and carrying out etherifying reaction at constant temperature of 75-80 DEG C for 30-90 minutes; and washing, neutralizing, centrifugalizing, drying and crushing a reaction product to obtain a sodium carboxymethyl cellulose finished product. According to the sodium carboxymethyl cellulose prepared through the method disclosed by the invention, the sodium carboxymethyl cellulose water solution is clear and transparent and contains no free fiber yarn so as to be applied to the industrial field with strict requirements on the free fiber yarns.

Description

technical field [0001] The invention relates to a preparation method of sodium carboxymethylcellulose, in particular to a method for improving free fiber filaments in aqueous solution of sodium carboxymethylcellulose. Background technique [0002] The aqueous solution of sodium carboxymethyl cellulose has the functions of thickening, bonding, film forming, protective glue, water retention, emulsification and suspension, etc. It is widely used in detergent, food, textile, printing and dyeing, papermaking, petroleum, mining, medicine, ceramics , coatings, cosmetics and other industries, known as the "monosodium glutamate" of industry. [0003] The general steps of the existing sodium carboxymethyl cellulose preparation method are a single type of cellulose, such as refined cotton or wood pulp, and sodium hydroxide, chloroacetic acid, ethanol solution through alkalization and etherification to obtain crude The sodium carboxymethyl cellulose product, the material is neutralized...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/12
Inventor 李友琦郭鸿雁
Owner CHONGQING LIHONG FINE CHEM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap