Preparation method of starch super-absorbent resin

A technology for super absorbent resin and starch, which is applied in the field of synthesizing starch super absorbent resin by reversed-phase suspension polymerization, can solve the problems of low elasticity, high viscosity, and large amount of polyethylene glycol 4000 in process operating conditions, and it is easy to achieve process conditions. Control, simplify the process operation process, improve the effect of operation stability

Inactive Publication Date: 2012-08-15
GUANGXI UNIV
View PDF1 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above literature research work only focuses on solving the problem of the influence of changes in process conditions such as reaction temperature, reaction time, oil-water ratio, and the amount of initiator, cross-linking agent and dispersant on the water absorption performance of the product. Sex is not taken seriously
According to the process conditions of the above documents, the following problems are generally found in the experiment: (1) The process operating conditions have low elasticity, are not easy to control, and are prone to instability of the reversed-phase suspension polymerization system such as wall sticking and agglomeration, which may cause production accidents in severe cases; (2) Due to the high initial viscosity of the starch water phase, it is often prone t

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

[0034] (1) Take 100 parts of tapioca starch according to the weight fraction, pretreat by mechanical ball milling for 0.5h, dissolve the pretreated starch in 800 parts of deaerated water, add sodium hydroxide to neutralize and contain 75% sodium acrylate in mole fraction 100 parts of acrylic acid, 2.5 parts of ammonium persulfate, 2 parts of N-N methylenebisacrylamide, 6 parts of Span80 and Tween80 mixed dispersant with a mass ratio of 2.5 and 15 parts of polyethylene glycol 2000, and mix well to obtain starch water phase mixing solution.

[0035] (2) In 960 parts of cyclohexane with a mass ratio of 1.2:1 to water, add PDMS (polydimethylsiloxane) with a mass ratio of 5% to cyclohexane, mix well and pass N 2 The oil phase can be obtained after deoxygenation.

[0036](3) Put the prepared oil phase into the polymerization kettle, and add the starch water phase mixed solution under stirring to carry out the reverse phase suspension polymerization reaction for 1.5 h. The stirring...

Embodiment 2

[0042] (1) Take 100 parts of corn starch according to the weight fraction, pretreat by mechanical ball milling for 1.5h, dissolve the pretreated starch in 1000 parts of deaerated water, add potassium hydroxide to neutralize and contain 75% sodium acrylate in mole fraction 200 parts of acrylic acid, 5 parts of ammonium persulfate, 5 parts of N-N methylenebisacrylamide, 15 parts of Span80 and Tween80 mixed dispersant with a mass ratio of 3 and 30 parts of polyethylene glycol 4000, and mix well to obtain starch water phase mixing solution.

[0043] (2) In 1800 parts of cyclohexane with a mass ratio of 1.8:1 to water, add PDMS (polydimethylsiloxane) with a mass ratio of 10% to cyclohexane, mix well and pass N 2 The oil phase can be obtained after deoxygenation.

[0044] (3) Put the prepared oil phase into the polymerization tank, and add the starch water phase mixed solution under stirring to carry out the reverse phase suspension polymerization reaction 2, the stirring speed is ...

Embodiment 3

[0050] (1) Take 100 parts of the mixture of tapioca starch and corn starch according to the weight fraction, and dissolve the treated starch in 1200 deoxygenated water after grinding pretreatment 2.5, add sodium acrylate neutralized with sodium hydroxide and contain 75% sodium acrylate in mole fraction 300 parts of acrylic acid, 10 parts of ammonium persulfate, 10 parts of N-N methylene bisacrylamide, 25 parts of Span80 and Tween80 mixed dispersant with a mass ratio of 3.5 and 40 parts of polyethylene glycol 6000, and mix well to obtain a starch aqueous phase mixed solution .

[0051] (2) In 3360 parts of cyclohexane with a mass ratio of 2.8:1 to water, add PDMS (polydimethylsiloxane) with a mass ratio of 15% to cyclohexane, mix well and pass N 2 The oil phase can be obtained after deoxygenation.

[0052] (3) Add the prepared oil phase into the polymerization kettle, and add the starch water phase mixed solution under stirring to carry out the reverse phase suspension polymer...

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
Water absorption rateaaaaaaaaaa
Water absorption rateaaaaaaaaaa
Water absorption rateaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of starch super-absorbent resin, which includes: using starch pretreated by mechanical grinding as substrate, using acrylic acid as monomer and ammonium persulfate as initiator, using N, N'-methylene-bis-acrylamide as crosslinking agent, using sorbitan monooleate (Span-80), polyoxyethylene sorbitan monooleate (Tween-80), polyethyleneglycol and PDMS (polydimethylsiloxane) as composite dispersant, using cyclohexane as an oil phase, and preparing starch graft super-absorbent resin by reversed phase suspension polymerization. A reversed phase suspension polymerization system used for the method is stable, bonding-free and caking-free, the starch super-absorbent resin is even granular bead products requiring no demulsification, and post-treatment operations such as washing, drying and the like after filtering can be performed directly. Monomer conversion rate reaches more than 99%, water absorbency of the starch super-absorbent resin reaches 800gXg<-1>, salt absorbency (0.9% NaCl by weight) reaches 75gXg<-1>, and the starch super-absorbent resin is capable of being saturated in water absorption in 4-10 minutes.

Description

technical field [0001] The invention belongs to the technical field of superabsorbent resin preparation, and in particular relates to a process for synthesizing starch superabsorbent resin by adopting a reverse phase suspension polymerization method. Background technique [0002] Superabsorbent resin is a functional polymer material that can absorb water hundreds of times its own weight, and is widely used in agriculture, forestry, medical care, daily chemical industry and other fields. Superabsorbent resins are divided into three categories: starch system, cellulose system and synthetic resin system. Starch superabsorbent resin is made by graft copolymerization of starch and hydrophilic vinyl monomers. It has the characteristics of low production cost, biodegradability, high water absorption and good water retention performance. The development requirements of performance, degradability and functional compounding. [0003] The production of starch superabsorbent resin mos...

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): C08F251/00C08F220/06C08F2/20
Inventor 童张法张友全陈雷黄科林廖丹葵黄世勇韦藤幼谢新玲陈珊珊
Owner GUANGXI UNIV
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