Method of preparing high water absorbing resin by process of reversed phase suspension polymerizing polypropylene

A super absorbent resin and reversed-phase suspension technology, which is applied in the field of preparation of polyacrylic acid super absorbent resin produced by reversed-phase suspension polymerization, can solve the problems of violent polymerization, difficult to obtain a stable reaction system, etc., and achieve the effect of preventing violent polymerization.

Inactive Publication Date: 2006-09-20
ZHEJIANG UNIV
View PDF0 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still difficult to obtain a stable reaction system by using the above-mentioned disclosed reversed-phase suspension dispersant. In the preparation process, there is still reaction and violent polymerization, and the gel agglomerates and sticks to the wall, resulting in a viscous shape (mixed with gel and small particles) Particles) products and other issues

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

[0025] Add 60-120mL cyclohexane into the three-necked reaction flask, and add 0.5-1.0g dispersant monoglyceride. Put 7.5-15.0g of acrylic acid in a conical flask; dissolve 3.1-6.2g of NaOH in 10-20mL of distilled water, and neutralize the acrylic acid in the aqueous solution under cooling. After neutralization, add 0.05~0.10g of K 2 S 2 o 8 , 0.05-0.10g of N, N-methylenebisacrylamide is dissolved to obtain a monomer mixture. Nitrogen is used to drive out the oxygen in the three-necked reaction flask, and the temperature is raised to 60-80°C to dissolve the dispersant. Put the previously prepared monomer mixture in the dropping funnel, and drop it into the reaction flask at a rate of 1-4 drops / second. Under nitrogen protection, react at a constant temperature of 60-80°C for 2-4 hours. After the reaction is completed, the temperature is lowered to room temperature, filtered, quickly washed with methanol, and dried at 100-110°C to obtain a white or light yellow, gel solid or...

Embodiment 2

[0027] Add 60~120mL cyclohexane into a three-necked reaction flask, add 0.5~1.0g of a mixture of 1:1 (or 1:2) stearyl phosphoester and Span-60 (or stearyl phosphoester and monoglyceride) With dispersant. Put 7.5-15.0g of acrylic acid in a conical flask; dissolve 3.1-6.2g of NaOH in 10-20mL of distilled water, and neutralize the acrylic acid in the aqueous solution under cooling. After neutralization, add 0.05~0.10g of K 2 S 2 o 8 , 0.05-0.10g of N, N-methylenebisacrylamide is dissolved to obtain a monomer mixture. Nitrogen is used to drive out the oxygen in the three-necked reaction flask, and the temperature is raised to 60-80°C to dissolve the compounded dispersant. Put the previously prepared monomer mixture in the dropping funnel, and drop it into the reaction flask at a rate of 1-4 drops / second. Under nitrogen protection, react at a constant temperature of 60-80°C for 2-4 hours. After the reaction is completed, the temperature is lowered to room temperature, filtere...

Embodiment 3

[0030] Effect of Monoglyceride as Dispersant on Properties of Water Absorbent Resin

[0031]Monoglyceride is used as a reverse-phase suspending and dispersing agent: when the weight percentage of monoglyceride and monomer acrylic acid is between 3.00% and 14.00%, the water absorption performance of the obtained resin is better than that of phosphoester and Span-60. The product is a hard gel solid or granular solid. After the gel absorbs water, it has a strong water retention capacity and is not easy to squeeze out water. The water absorption rate can generally reach 500-700ml / g, and the salt water absorption rate is about 70-85% (Table 1).

[0032] cetylphosphorus

[0033] a. The weight percentage of dispersant and monomer acrylic acid

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 absorptionaaaaaaaaaa
water absorptionaaaaaaaaaa
water absorptionaaaaaaaaaa
Login to view more

Abstract

This invention relates to a method to prepare superabsorbent polycrylic acid (or its salt) resin by verse-suspension polymerization, with cyclohexane adopted as solvent, crylic acid as monomers, K2S208 as initiators and N, N'-methylenebisacrylamide as cross-linking reagent. It has the characteristics that the dispersants for verse-suspension in the reaction system can be monoglyceryl ester or octadecyl phosphatide/span-60 complex or octadecyl phosphatide/monogylceryl ester complex and the dispersants weigh 2~20% of crylic acid monomers. The superabsorbent polycrylic acid resin prepared in this invention is white or light yellow visible impurity-free gel solid or solid particles, with sufficient gel strength, a water absorption of over 600ml/g and a salt solution absorption of over 70ml/g.

Description

technical field [0001] The present invention relates to the preparation method of polyacrylic acid (salt) superabsorbent resin produced by reverse phase suspension polymerization method, especially relates to using cyclohexane as solvent, acrylic acid as monomer, K 2 S 2 o 8 It is an initiator, N, N'-methylenebisacrylamide is a crosslinking agent, and a dispersant used in the reverse phase suspension polymerization method. Background technique [0002] Superabsorbent resin is a kind of macromolecule containing hydrophilic groups and cross-linked structure. It was first prepared by Fanta et al. by grafting polyacrylonitrile with starch and then saponifying it. Polyacrylic acid-based superabsorbent resin has a series of advantages such as low production cost, simple process, high production efficiency, strong water absorption capacity, and long product shelf life. Chemical Industry Press, 1991). Inverse suspension polymerization is one of the main methods to produce polyac...

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): C08F110/06C08F2/08
Inventor 徐伟亮
Owner ZHEJIANG 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