Cationic polymer as well as preparation method and application thereof

A cationic polymer and polymer technology, applied in the direction of separation method, liquid separation, grease/oily substance/floating matter removal device, etc., can solve the problem of lack of demulsification and flocculation ability, low cationic degree of melamine resin, melamine Solve the problems of short resin storage period and achieve the effect of oil-water separation, large molecular weight and long storage period

Active Publication Date: 2013-12-18
GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are following problems in the melamine formaldehyde resin in the prior art: 1, the synthetic melamine resin storage period under general process condition is shorter, often use while synthesizing, for this reason, often adopt the etherification reaction to prolong the storage period of product, but Due to the loss of activity of amino and methylol etherification after etherification, it cannot be used for demulsification, flocculation, etc.
2. Moreover, the melamine resin synthesized by the prior art has low cationic degree and relatively small molecular weight. Even if no etherification reaction is adopted, it does not have demulsification and flocculation capabilities, and is rarely used for demulsification and flocculation applications.
3. Due to its high content of free formaldehyde, it is easy to pollute the environment

Method used

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  • Cationic polymer as well as preparation method and application thereof
  • Cationic polymer as well as preparation method and application thereof
  • Cationic polymer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a cationic polymer, which is prepared through five process steps of metering and mixing, methylol reaction, polycondensation reaction, polymerization inhibition reaction, and elimination of free formaldehyde, specifically as follows: add 400 parts by weight of The water is heated up to 60°C, and the pH is adjusted to 9 with an alkaline substance; then 40 parts by weight of melamine is added, 70 parts by weight of formaldehyde is added, the temperature is raised to 80°C, and the reaction is carried out for 40 minutes; The acidic substance adjusted the pH to 2, raised the temperature, and reacted at 85° C. for 4 hours; finally added 4 parts by weight of formaldehyde remover, and kept the reaction for 30 minutes to obtain a cationic polymer.

[0037] The cationic polymer prepared in this example has a structural formula such as Formula 1, n=5000, a cationic degree of 20%, and a density of 1.02 g / ml.

Embodiment 2

[0039] A method for preparing a cationic polymer, which is prepared through five process steps of metering and mixing, methylol reaction, polycondensation reaction, polymerization inhibition reaction, and elimination of free formaldehyde, specifically as follows: add 800 parts by weight of The water is heated up to 65°C, and the pH is adjusted to 9.5 with an alkaline substance; then 120 parts by weight of melamine is added, 240 parts by weight of formaldehyde is added, the temperature is raised to 85°C, and the reaction is carried out for 60 minutes; 12 parts by weight of a polymerization inhibitor is added, and the Adjust the pH to 4 with the acidic substance, raise the temperature, and react at 95° C. for 2 hours; finally add 12 parts by weight of formaldehyde remover, and keep the reaction for 1 hour to obtain a cationic polymer.

[0040] The cationic polymer prepared in this example has a structural formula such as formula 1, n=30000, a cationic degree of 28% and a density ...

Embodiment 3

[0042]A method for preparing a cationic polymer, which is prepared through five process steps of metering and mixing, methylol reaction, polycondensation reaction, polymerization inhibition reaction, and elimination of free formaldehyde, specifically as follows: add 900 parts by weight of water, adjust the pH to 8.5 with an alkaline substance; then add 60 parts by weight of melamine, add 110 parts by weight of formaldehyde, heat up to 70°C, and react for 60 minutes; add 5 parts by weight of a polymerization inhibitor, and adjust the pH to 3. Raise the temperature and react at 90° C. for 3 hours; finally add 8 parts by weight of formaldehyde remover and keep it warm for 60 minutes to obtain a cationic polymer.

[0043] The cationic polymer prepared in this example has a structural formula such as formula 1, n=12000, a cationic degree of 22% and a density of 1.03 g / ml.

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Abstract

The invention discloses a cationic polymer as well as a preparation method and application thereof. The cationic polymer is prepared by the following five process steps in sequence: metering and mixing, hydroxymethylation reaction, polycondensation, inhibition reaction and free formaldehyde elimination. The cationic polymer has the advantages of high cationic degree, high molecular weight, long storage life and low formaldehyde content, and can serve as a flocculating agent, a reverse-phase demulsifier, a water reducing agent for concrete or a treating agent of textile fibers.

Description

technical field [0001] The invention relates to a cationic polymer and its preparation method and application. Background technique [0002] Melamine-formaldehyde resin is a polymer obtained by reacting melamine and formaldehyde. Also known as melamine formaldehyde resin or melamine resin. The raw material is melamine (2,4,6-triamino-1,3,5-triazine) and 37% formaldehyde solution, the molar ratio of formaldehyde to melamine is 2-3, the first step generates different numbers of N-hydroxyl The methyl substituent is then further condensed into a linear resin. The reaction conditions are different, the molecular weight of the product is different, and it can be from water-soluble to insoluble in water, or even insoluble solid. The pH value has a great influence on the reaction rate. The resin solution prepared by the above reaction is not suitable for storage, and the spray drying method is commonly used in industry to make a powdery solid. Melamine resin does not cure at roo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/32C02F1/40C02F1/56
Inventor 宋澄章梁国辉叶涛边旭斌饶丹
Owner GUANGZHOU ZHENQING ENVIRONMENTAL PROTECTION TECH
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