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A kind of synthetic method of polyacrylate

A technology of polyacrylate and synthesis method, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems such as the large amount of molecular weight regulator sodium formate, the low utilization rate of active groups, and the increase of product manufacturing cost, etc. Product quality stability, low cost, and the effect of preventing explosion

Active Publication Date: 2021-12-10
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis process has the advantages of high conversion rate, high product purity, and molecular weight distribution, but first, the molecular weight regulator sodium formate is used in a large amount and cannot be recycled by external steaming like isopropanol, which increases the manufacturing cost of the product; secondly, The activity of sodium bisulfite is relatively high, the utilization rate of active groups generated after decomposition is low, the amount of initiator used is too large, and a large amount of sulfate ions will be generated after oxidation and reduction, which will cause precipitation problems in the product in winter or under low temperature collisions. Product quality is not stable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Dissolve 130g of sodium metabisulfite in 303g of deionized water to prepare an aqueous solution with a concentration of 30% by mass and put it into the dropping device;

[0026] (2) Dissolve 4.5g of oxidant in 25.5g of deionized water to prepare an aqueous solution with a concentration of 15% by mass and put it into another dropping device;

[0027] (3) Mix 1000g of acrylic acid with 100g of deionized water evenly, and pour it into the acrylic acid dropping device;

[0028] (4) Put the remaining 551.5g of deionized water into the kettle, turn on the stirring and raise the temperature to 60~65°C, and at the same time turn on the dropping device in step (1), step (2) and step (3) and control the dropping speed of the material The acrylic acid monomer and the reducing agent sodium metabisulfite solution are added dropwise at the same time, and the oxidizing agent is delayed for 6 minutes before the dropwise addition is completed, and all the dropwise addition is comple...

Embodiment 2

[0031] (1) Dissolve 106g of sodium metabisulfite in 318g of deionized water to prepare an aqueous solution with a concentration of 25% by mass and put it into the dropping device;

[0032] (2) Dissolve 11.5g of oxidant in 52.4g of deionized water to prepare an aqueous solution with a concentration of 18% by mass and put it into another dropping device;

[0033] (3) Mix 1000g of acrylic acid and 150g of deionized water evenly, and put it into the acrylic acid dropping device;

[0034] (4) Put the remaining 429.6g of deionized water into the kettle, turn on the stirring and raise the temperature to 60~65°C, at the same time turn on the dropping device in step (1), step (2) and step (3) and control the dropping speed of the material The acrylic acid monomer and the reducing agent sodium metabisulfite solution are added dropwise at the same time, the oxidizing agent is delayed for 10 minutes, and the dropwise addition is completed in 1 hour and 45 minutes;

[0035] (5) After heat...

Embodiment 3

[0037] (1) Dissolve 109g of sodium metabisulfite in 389g of deionized water to prepare an aqueous solution with a concentration of 28% by mass and put it into the dropping device;

[0038] (2) Dissolve 8g of oxidant in 45.3g of deionized water, prepare an aqueous solution with a concentration of 15% by mass and put it into another dropping device;

[0039] (3) Mix 1000g of acrylic acid and 120g of deionized water evenly, and put it into the acrylic acid dropping device;

[0040] (4) Put the remaining 445.7g of deionized water into the kettle, turn on the stirring and raise the temperature to 60~65°C, and at the same time turn on the dropping device in step (1), step (2) and step (3) and control the dropping speed of the material The acrylic acid monomer and the reducing agent sodium metabisulfite solution are added dropwise at the same time, and the oxidizing agent is delayed for 8 minutes before the dropwise addition is completed, and all the dropwise addition is completed wi...

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Abstract

The invention discloses a method for synthesizing polyacrylic acid salt, a water treatment agent. Specifically, the method is at 60-65°C, using the water phase as the reaction medium, using persulfate and sodium metabisulfite oxidation-reduction system as the initiator, and stirring Under certain conditions, a certain concentration of monomer and initiator aqueous solution are dropped into the kettle at the same time to undergo a polymerization reaction, and then undergo heat preservation, distillation, decolorization with hydrogen peroxide, and neutralization with sodium hydroxide to obtain polyacrylic acid salt. The method of the invention has low initiator dosage, high initiation efficiency and high product purity, and the synthetic product has no phosphorus, low sulfur and stable quality. The method has the advantages of simple synthesis process, easy process control, simple operation and easy realization of large-scale industrialization. The product can be used in industrial heat exchange equipment as water quality stabilizer, ceramic additive, pigment dispersant, drilling mud fluid loss reducer, cement water reducer and other fields.

Description

technical field [0001] The invention belongs to the field of polymerization reaction, and in particular relates to a method for synthesizing polyacrylic acid salt of a water treatment agent. [0002] technical background [0003] Polyacrylate is one of the acrylic fine chemical products developed at home and abroad in recent years. The product is widely used in industrial heat exchange equipment as water quality stabilizer, ceramic additive, pigment dispersant, drilling mud fluid loss reducer, cement water reducer medicines and other fields. [0004] Due to the specific relative molecular weight, application function and economical considerations of its synthesis method, solution method, suspension method and emulsion method can be used to synthesize solution state, colloid, rubber plate or powder polymer. In actual production, in order to achieve easy control of molecular weight and stable product quality, sodium hypophosphite is often used as the reducing agent of the redo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06C08F4/40C02F1/56
CPCC02F1/56C08F4/40C08F120/06
Inventor 林胜涛程终发申义驰李鹏飞陆久田王宁宁张敏
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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