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Preparation method of polyacrylate flocculant

A technology of polyacrylate and acrylate, which is applied in the field of preparation of polyacrylate flocculants, can solve problems such as difficulty in chopping and drying, poor water solubility, and easy agglomeration, and achieves moisture absorption, high molecular weight, and water solubility Good results

Inactive Publication Date: 2015-11-25
谈丽娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-molecular-weight sodium polyacrylate synthesized by the existing method has problems such as poor water solubility due to crosslinking, easy agglomeration when dissolving due to strong hygroscopicity, and easy moisture absorption and agglomeration during storage, which directly affects its use.
Also during the preparation process, it is difficult to chop and dry due to the formation of large gel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 (1) Preparation of sodium acrylate solution I:

[0011] Take 111kg of sodium hydroxide and dissolve it in 380kg of water, control the temperature below 45℃, add it to 200kg of acrylic acid, stir evenly, control the temperature below 35℃, add 2kg of activated carbon to it, stir for 2 hours and then filter. (2) Preparation of polymerization aid liquid II:

[0012] Dissolve 2 kg of urea, 0.25 kg of soap base, 0.05 kg of sodium sulfite, and 0.18 kg of sodium persulfate in 10 kg of water and stir well. (3) Adjust the pH of sodium acrylate solution I to 12.3 with sodium hydroxide, add polymerization aid solution II, stir and mix evenly, pour it into a plastic tray with strips, let stand for 3 hours at room temperature for polymerization, and take out the strips The gel is broken down into small particles with a disintegrator, and dried and crushed to obtain the product. The product has a viscosity average molecular weight of 38 million and a dissolution time of 1 hour....

Embodiment 2

[0013] Example 2 (1) Preparation of sodium acrylate solution I:

[0014] Take 2.78kg sodium hydroxide and dissolve it into 9.51kg water, control the temperature below 45℃, add it to 5kg acrylic acid, stir evenly, control the temperature below 35℃, add 0.55kg activated carbon to it, stir for 2 hours and then filter. (2) Preparation of polymerization aid liquid II:

[0015] Dissolve 0.05 kg of urea, 0.007 kg of soap base, 0.0005 kg of sodium sulfite, and 0.0045 kg of sodium persulfate in 0.25 kg of water and stir well. (3) Adjust the pH value of sodium acrylate solution I to 12.0 with sodium hydroxide, add polymerization aid solution II, stir and mix evenly, pour it into a plastic tray with strips, let stand for 4 hours at room temperature for polymerization, and take out the strips The gel is broken down into small particles with a disintegrator, and dried and crushed to obtain the product. The product has a viscosity average molecular weight of 32 million and a dissolution time o...

Embodiment 3

[0016] Example 3 (1) Preparation of sodium acrylate solution I:

[0017] Take 55.5g sodium hydroxide and dissolve it in 190g water, control the temperature below 45℃, add it to 100g acrylic acid, stir evenly, control the temperature below 35℃, add 1g activated carbon to it, stir for 2 hours and then filter. (2) Preparation of polymerization aid liquid II:

[0018] Dissolve 1.5 g of urea, 0.12 g of soap base, 0.01 g of sodium sulfite, and 0.1 g of sodium persulfate in 7.5 g of water and stir well. (3) Adjust the pH of sodium acrylate solution I to 12.5 with sodium hydroxide, add polymerization aid solution II, stir and mix evenly, pour it into a specially designed plastic tray with a grid, and let it stand for 3 hours at room temperature for polymerization. Take out the strip-shaped gel, break it into small particles with a disintegrator, and dry and crush to obtain the product. The product has a viscosity average molecular weight of 32 million and a dissolution time of 1 hour.

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PUM

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Abstract

A preparation method of a polyacrylate flocculant comprises the following steps: (1) preparation of an acrylate solution I: controlling system temperature to be lower than 35 DEG C and mixing alkali at the weight percent concentration of 22.6% and acrylic acid according to the molar ratio of 1:1 so as to obtain the acrylate solution I; (2) preparation of a polymerization additive liquid II: dissolving 0.5-4 parts by weight of an anti-cross-linking agent, 0.1-0.5 part by weight of an anti-agglomeration agent and 0.16-0.46 part by weight of an initiator in 10-30 parts by weight of water and uniformly mixing the above components so as to obtain the polymerization additive liquid II; (3) adjusting pH value of 346 parts by weight of the acrylate solution I to 12-12.5 by the use of alkali, adding the polymerization additive liquid II, stirring and uniformly mixing, and standing at normal temperature for 3-10 h; (4) smashing, drying and crushing. The alkali for neutralizing acrylic acid and the alkali for adjusting pH value of the system are sodium hydroxide, potassium hydroxide, sodium bicarbonate or sodium carbonate. The initiator is sodium persulfate or potassium persulfate and sodium sulfite, sodium hydrogen sulfite or a potassium bisulfate compound. The anti-cross-linking agent is urea or EDTA. The anti-agglomeration agent is soap base or sodium stearate.

Description

Technical field [0001] The invention relates to a method for preparing a flocculant, in particular to a method for preparing a polyacrylate flocculant. Background technique [0002] Sodium polyacrylate is a new type of water-soluble polymer flocculant. It has been widely used in food industry, paper industry, urban sewage treatment: brine refining in caustic soda and soda ash manufacturing; sugar juice clarification in sugar industry: sedimentation and separation of red mud in alumina plants. Its flocculation effect is to neutralize the charge of positively charged particles in the water through the negative charge ionized by the sodium acrylate polymer; the other is the bridging effect of macromolecules to flocculate and settle the particulate matter in the water. The high-molecular-weight sodium polyacrylate synthesized by the existing method has problems such as poor water solubility due to cross-linking, easy agglomeration during dissolution due to strong hygroscopicity, and...

Claims

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Application Information

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IPC IPC(8): C08L33/02C08F120/06C08F4/40
Inventor 谈丽娜
Owner 谈丽娜
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