Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing polyacrylamide/crylic acid copolymer by hydrolyzing polyacrylamide without catalysis in subcritical water

A technology of acrylic copolymer and polyacrylamide, which is applied in the field of preparing polyacrylamide/acrylic acid copolymer, can solve the problems of increasing production cost, complicated process, polluting the environment, etc., and achieves the effects of high speed and simple reaction process.

Inactive Publication Date: 2010-09-29
ZHEJIANG UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, polyacrylamide / acrylic acid copolymers are often prepared by acid-base catalyzed hydrolysis. Due to the cumbersome acid and alkali hydrolysis process, a large amount of inorganic salts are produced after neutralization by acid and alkali catalysts, which not only seriously pollutes the environment, but also consumes a lot of resources and increases Cost of production

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
  • Method for preparing polyacrylamide/crylic acid copolymer by hydrolyzing polyacrylamide without catalysis in subcritical water
  • Method for preparing polyacrylamide/crylic acid copolymer by hydrolyzing polyacrylamide without catalysis in subcritical water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 300 g of deionized water and 7.5 g of polyacrylamide were added into a 500 mL batch type autoclave, and the mass ratio of deionized water to polyacrylamide was 40:1. Turn on stirring, heat up to boiling under normal pressure, open the exhaust valve for 2 minutes, and use water vapor to remove the air in the kettle; close the exhaust valve, continue to heat up to 200 ° C for 15 hours; The polyacrylamide / acrylic acid solid product 7.2 was obtained after evaporation of water and vacuum drying. After analysis of the product, the acrylamide content was 79.6%, the acrylic acid content was 20.4%, and the weight average molecular weight was 21260.

Embodiment 2

[0025] Add 300 g of deionized water and 10 g of polyacrylamide into a 500 mL batch type autoclave, and the mass ratio of deionized water to polyacrylamide is 30:1. Turn on stirring, heat up to boiling under normal pressure, open the exhaust valve for 2 minutes, and use water vapor to remove the air in the kettle; close the exhaust valve, continue to heat up to 200°C for 10 hours of hydrolysis; The polyacrylamide / acrylic acid solid product 9.1 was obtained after evaporation of water and vacuum drying. After analysis of the product, the acrylamide content was 45.9%, the acrylic acid content was 54.1%, and the weight average molecular weight was 4240.

Embodiment 3

[0027] Add 300 g of deionized water and 15 g of polyacrylamide into a 500 mL batch type autoclave, and the mass ratio of deionized water to polyacrylamide is 20:1. Turn on stirring, heat up to boiling under normal pressure, open the exhaust valve for 4 minutes, and use water vapor to remove the air in the kettle; close the exhaust valve, continue to heat up to 240 ° C for 6 hours; The polyacrylamide / acrylic acid solid product 13.2 was obtained after evaporation of water and vacuum drying. After analysis of the product, the acrylamide content was 39.6%, the acrylic acid content was 60.4%, and the weight average molecular weight was 4530.

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 discloses a method for preparing polyacrylamide / crylic acid copolymer by hydrolyzing polyacrylamide without catalysis in subcritical water. The method comprises the following steps: 1) adding deionized water and polyacrylamide with a mass ratio of 1:1 to 40:1 in a high pressure reactor, stirring, heating at normal pressure till boiling, and opening a vent valve for 2 to 5 minutes, 2) heating to 200 to 320 DEG C and hydrolyzing for 0.5 to 15 hours, and 3) cooling hydrolysis liquid, relieving pressure, evaporating water at normal pressure, and vacuumizing so as to obtain the polyacrylamide / crylic acid solid product. In the hydrolysis process of the invention, no catalyst is added, the pollution problem of acid and base catalysis is solved, the process is simple and environment-friendly, the hydrolysis product can be used as fabric sizing agent, water processing agent, polymer flocculating agent, high absorbable resin, polymer antisludging agent, and the like.

Description

technical field [0001] The invention relates to a method for preparing polyacrylamide / acrylic acid copolymer by non-catalytic hydrolysis of polyacrylamide in a near-critical water medium. Background technique [0002] Polyacrylamide (Polyacrylamide, referred to as PAM), is acrylamide (acrylamide, molecular formula CH 2 =CHCONH 2 ) and its derived homopolymers and copolymers. Polyacrylamide (PAM) is a linear water-soluble polymer, and it is one of the most widely used varieties of water-soluble polymers. It is polymerized from acrylamide, so it has a large number of side groups-amide groups on the main chain of its molecule. The amide group has great chemical activity and can react with various compounds to produce many derivatives of polyacrylamide. Polyacrylamide (AM) / acrylic acid (AA) copolymer is a kind of multifunctional polymer compound with a wide range of uses. It is the most important variety in water-soluble polymer polyelectrolytes. Industrial and agricultural...

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): C08F20/56C08F8/12C08F220/56C08F220/06
Inventor 吕秀阳刘体锋
Owner ZHEJIANG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com