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

Technology for producing substitution-degree hydroxyethyl cellulose

A high-degree hydroxyethyl and cellulose technology, applied in the field of high-substitution hydroxyethyl cellulose, can solve the problems that the degree of substitution can only reach 1.5-2.0, affect the application effect, and is not easy to control, so as to improve labor efficiency And the effect of production safety, shelf life extension, and mildew resistance improvement

Inactive Publication Date: 2011-09-14
刘传荣
View PDF4 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydroxyethyl cellulose is made by reacting natural cellulose with ethylene oxide under the action of solvent and alkali. At present, one-step etherification process is adopted in China, that is, a sufficient amount of ethylene oxide is added at one time, and then It is prepared by reacting in stages; due to the excessive and high concentration of ethylene oxide in the system, the side reaction is very fast and it is not easy to control. The degree of substitution generally can only reach 1.5-2.0, which affects the product in latex paint. Therefore, 80% of the large-scale latex paint production units in China currently use imported hydroxyethyl cellulose

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
  • Technology for producing substitution-degree hydroxyethyl cellulose
  • Technology for producing substitution-degree hydroxyethyl cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Pulverization: 1000 parts by mass of refined cellulose is pulverized with a rotary knife pulverizer, separated by a cyclone separator to reach 0.03-0.15mm (about 80 meshes), and the tail gas is subjected to bag dust removal;

[0033] (2) Alkalization: Add 5000 parts by mass of isopropanol solution into the reaction kettle and stir, add 200 parts by mass of caustic soda, heat up to 60°C for alkalization, after alkalinization, cool down to normal temperature, add step The pulverized refined cellulose obtained in (1) was alkalized at 20° C. for 0.5 hour;

[0034] (3) Reaction: divided into two steps,

[0035] First, add 40% oxirane of recipe amount in the reactor, this step reaction divides two stages, and the first stage is to react 1.5 hours under the situation that reaction temperature is 45 ℃, and the second stage is to react at reaction temperature React for 1 hour at 75°C;

[0036] Then, in the reactor, add the oxirane of formulation amount 60% again, this step...

Embodiment 2

[0044] (1) Pulverization: 1000 parts by mass of refined cellulose is pulverized with a rotary knife pulverizer, separated by a cyclone separator to reach 0.03-0.15mm (about 80 meshes), and the tail gas is subjected to bag dust removal;

[0045] (2) Alkalinization: Add 12000 parts by mass of n-propanol solution into the reaction kettle and stir, add 280 parts by mass of caustic soda, heat up to 70°C for alkalization, after alkalinization, cool down to normal temperature, add step The pulverized refined cellulose obtained in (1) was alkalized at 15° C. for 1.5 hours;

[0046] (3) Reaction: divided into two steps,

[0047] At first, add the oxirane of recipe amount 65% in the reactor, this step reaction is divided into two stages, and the first stage is to react 0.5 hour under the situation that reaction temperature is 60 ℃, and the second stage is to react at reaction temperature Reaction at 85°C for 0.5 hours;

[0048] Then, in the reactor, add the oxirane of formulation amou...

Embodiment 3

[0056](1) Pulverization: 1000 parts by mass of refined cellulose is pulverized with a rotary knife pulverizer, separated by a cyclone separator to reach 0.03-0.15mm (about 80 meshes), and the tail gas is subjected to bag dust removal;

[0057] (2) Alkalization: Add 10000 parts by mass of n-butanol solution into the reaction kettle and stir, add 250 parts by mass of caustic soda, heat up to 85°C for alkalization, after alkalinization, cool down to normal temperature, and add step The pulverized refined cellulose obtained in (1) was alkalized at 35° C. for 1 hour;

[0058] (3) Reaction: divided into two steps,

[0059] First, add 50% ethylene oxide in the reaction kettle, this step reaction is divided into two stages, the first stage is to react for 1 hour at a reaction temperature of 50°C, and the second stage is to react at a reaction temperature of 50°C. React for 1.5 hours at 65°C;

[0060] Then, in the reactor, add the oxirane of formulation amount 50% again, this step re...

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
transmittivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a technology for producing substitution-degree hydroxyethyl cellulose, relating to the field of fine chemical industry. A multistep method, namely the addition of ethylene oxide according to substitution-degree requirement for multiple times, is adopted, wherein the concentration of ethylene oxide in a system is stabilized in a certain range; side-reaction speed is controlled at a low state and beneficial to the stable proceeding of positive reaction; the substitution degree can achieve 2.0-2.6; simultaneously, the uniformity degree of molecular substitution can be improved greatly, the quality stability of products is enhanced, the fungus resistance of the products can be improved by 30% and the shelf life of produced emulsion paint is prolonged by three months; and the whole reaction process of the technology for producing the substitution-degree hydroxyethyl cellulose is controlled by a computer DCS (Distribution Control System) program, the labor intensity is lowered, a production device of the same scale can save twelve fixed members, and the labor efficiency and the production safety are improved.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a process for producing hydroxyethyl cellulose with a high degree of substitution. Background technique [0002] Hydroxyethyl cellulose is made by reacting natural cellulose with ethylene oxide under the action of solvent and alkali. At present, one-step etherification process is adopted in China, that is, a sufficient amount of ethylene oxide is added at one time, and then It is prepared by reacting in stages; due to the excessive and high concentration of ethylene oxide in the system, the side reaction is very fast and it is not easy to control. The degree of substitution generally can only reach 1.5-2.0, which affects the product in latex paint. Therefore, at present, 80% of the large-scale latex paint production units in China use imported hydroxyethyl cellulose. Contents of the invention [0003] In order to solve the above-mentioned technical problems, the present invention...

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 Applications(China)
IPC IPC(8): C08B11/08C09D101/28C09D5/02
Inventor 刘传荣邸蓉邸勇
Owner 刘传荣
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