Method for preparing resin type water-retaining preparation

A water-retaining agent and resin-based technology, which is applied in the field of preparation of resin-type water-retaining agents, can solve problems such as complex process, reduced ability to absorb distilled water, and great influence, and achieve the effects of low reaction temperature, fast water absorption rate, and short reaction time

Inactive Publication Date: 2005-07-20
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
View PDF7 Cites 24 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most water-absorbing resins are synthesized by binary copolymerization. For example, US4134863, US3981100, and CN86104111 use acrylonitrile as the acrylic monomer. Their disadvantage is that the CN contained in the synthesized resin must be converted into hydrophilic after hydrolysis. Only the group has water absorption and the process is complicated
Another example is that the special public clear 54-37188 and the special public clear 58-25160 use starch grafted acrylic acid. Their common feature is that the absorption rate of distilled water is high, but the absorption rate of salt water is low. This is because the -COOH of acrylic acid is ionic. The effect of electrolytes is very large
However, US4921904 and EP347241 are binary graft copolymers of starch and acrylamide. Since the amide group is non-ionic, it is less affected by the electrolyte, so that the salt water absorption rate of this type of resin is increased, but the overall ability to absorb distilled water is reduced.
In addition, the above patents use sodium hydroxide during hydrolysis and neutralization, and sodium ions will destroy the structure of the soil after entering the soil, resulting in soil compaction

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

[0019] Starch, acrylic acid and acrylamide are used as raw materials, the redox system formed by potassium persulfate-sodium bisulfite is used as the initiator, and N N-methylenebisacrylamide is used as the cross-linking agent to carry out ternary copolymerization. The specific steps as follows:

[0020] The mass ratio of starch to acrylic acid and acrylamide is 1:0.4:0.08. First, mix 2g of starch and 30g of distilled water evenly, then gelatinize in a reactor at a gelatinization temperature of 75°C; then use potassium hydroxide to neutralize acrylic acid and alkali The degree of melting is 80%. After cooling to room temperature, pour it into the reactor together with the acrylamide aqueous solution and mix with the gelatinized starch; then add 4.0×10 -3 mol L -1 Initiator, 0.08mol L -1 The cross-linking agent and the initiator are redox systems formed by potassium persulfate and sodium bisulfite at a mass ratio of 1:0.8, and the addition method of potassium persulfate and s...

Embodiment 2

[0022] The difference from Example 1 is:

[0023] The mass ratio of starch to acrylic acid and acrylamide is 1:0.2:0.03. First, mix 5g of starch and 20g of distilled water evenly, then gelatinize in the reactor, and the gelatinization temperature is 70°C; then use potassium hydroxide to neutralize acrylic acid, alkali The melting degree is 90%. After cooling to room temperature, pour it into the reactor together with the acrylamide aqueous solution and mix with the gelatinized starch; then add 1.5×10 -4 mol L -1 Initiator, 0.04mol L -1 The cross-linking agent and the initiator are redox systems formed by potassium persulfate and sodium bisulfite at a mass ratio of 1:0.1, and the addition method of potassium persulfate and sodium bisulfite is sequentially added. in N 2 Under protection, the polymerization reaction temperature is 25°C and stirred for 1.5 hours until the end of the polymerization reaction; the pH is adjusted to neutral with lye; the grafted product is washed a...

Embodiment 3

[0025] The difference from Example 1 is:

[0026] The mass ratio of starch to acrylic acid and acrylamide is 1:0.5:0.02. First, mix 4g of starch and 40g of distilled water evenly, then gelatinize in a reactor at a gelatinization temperature of 90°C; then use potassium hydroxide to neutralize acrylic acid and alkali The degree of melting is 60%. After cooling to room temperature, pour it into the reactor together with the acrylamide aqueous solution and mix with the gelatinized starch; then add 6.0×10 -3 mol L -1 Initiator, 0.1mol L -1 The cross-linking agent and the initiator are redox systems formed by potassium persulfate and sodium bisulfite at a mass ratio of 1:0.3, and the potassium persulfate and sodium bisulfite are added in sequence. in N 2 Under protection, the polymerization reaction temperature is 30°C and stirred for 1 hour until the end of the polymerization reaction; the pH is adjusted to neutral with lye; the grafted product is washed and filtered and then dr...

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 resin type water keeping agent is prepared with starch, acrylic acid and acrylamide as main material, oxidation-reduction system of potassium persulfate and sodium bisulfite as initiator, N, N-methylene bisacrylamide as crosslinking agent and through ternary grafting copolymerization. The preparation process includes the steps of: 1) gelatinizing starch, neutralizing acrylic acid with potassium hydroxide, cooling to room temperature and mixing with acrylamide aqua and gelatinized starch in a reactor; 2) adding crosslinking agent and initiator for polymerization under N2 protection; 3) regulating pH with alkali solution to neutral, washing the grafted product, drying and crushing to obtain white granular resin product. The resin type water keeping agent has fast water absorption, high water absorption rate and no destruction to soil structure, and can provide potash fertilizer.

Description

technical field [0001] The invention relates to water-saving and water-retaining technology, in particular to a method for preparing a resin-type water-retaining agent. Background technique [0002] In recent years, due to the drought and lack of rainfall in most parts of the north, the crisis of agricultural water use has been intensified. The development of water-saving irrigation and dryland agricultural water-saving and water-saving technologies centered on making full use of natural precipitation has become an inevitable choice for sustainable agricultural development. Among them, the use of soil water-retaining agents to save water and increase production is an effective way and method of water-saving in modern agriculture. . [0003] There are many kinds of superabsorbent resin materials produced all over the world, and starch is the main material in the United States, Europe and China. This is because starch is a cheap, easy-to-obtain natural polymer raw material, ...

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): C08F251/00C09K17/18
Inventor 刘作新王志玉
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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