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Cation modified polycarboxylate superplasticizer and preparation method thereof

A polycarboxylic acid and cation technology, which is applied in the field of cation-modified polycarboxylic acid water reducing agent and its preparation, and building material admixtures, can solve the problems of poor dispersion performance, low adsorption efficiency, unstretched adsorption form, etc. Good dispersion effect, strong adsorption effect and high water reduction rate

Inactive Publication Date: 2015-03-25
CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of this, if the anionic functional group is simply used as the main chain of the polycarboxylate superplasticizer, the adsorption efficiency of the polycarboxylate superplasticizer is low and the dispersion performance is poor, and it is difficult to maximize the dispersion effect of the polycarboxylate superplasticizer
[0004] On the other hand, the cement slurry system is a strong electrolyte and a strong alkaline environment. The ordinary polycarboxylate superplasticizer is an anionic polyelectrolyte, and its molecular chain is prone to curling under the action of small molecular salts, resulting in the inability of carboxyl groups to be completely adsorbed on cement particles. Surface, and the adsorption form is not stretched, so the steric hindrance of polycarboxylate superplasticizer cannot be maximized

Method used

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  • Cation modified polycarboxylate superplasticizer and preparation method thereof
  • Cation modified polycarboxylate superplasticizer and preparation method thereof
  • Cation modified polycarboxylate superplasticizer and preparation method thereof

Examples

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Embodiment 1

[0031]A cationic modified polycarboxylate water reducer, the preparation method of which comprises the steps of:

[0032] 1) Accurately weigh 360 g of monomer a isopentenol polyoxyethylene ether, monomer b acrylic acid 25 g, cationic monomer c methacryloyloxyethyl-benzyl-dimethyl ammonium chloride 18 g and monomer d maleic anhydride 10g, initiator potassium persulfate 2g and chain transfer agent 3-mercaptopropionic acid 0.5g;

[0033] 2) In a 1L round bottom flask equipped with a thermometer, stirrer, reflux condenser and nitrogen purging device, add 300g of distilled water and stir, and use nitrogen purging to remove the oxygen in the system, and then pour it into the flask once under the protection of nitrogen. Add 360g isopentenol polyoxyethylene ether (TPEG-2400), stir and dissolve, then heat up to 60°C to obtain aqueous solution A;

[0034] 3) Mix 10g of maleic anhydride, 25g of acrylic acid, 0.5g of 3-mercaptopropionic acid, 18g of (meth)acryloyloxyethyl-benzyl-dimethyl...

Embodiment 2

[0040] A cationic modified polycarboxylate water reducer, the preparation method of which comprises the steps of:

[0041] 1) Accurately weigh 360g of monomer a isopentenol polyoxyethylene ether, 30g of monomer b acrylic acid, 20g of cationic monomer c acryloyloxyethyltrimethylammonium chloride and 8.5g of monomer d itaconic acid , initiator potassium persulfate 4g and chain transfer agent 3-mercaptopropionic acid 0.8g;

[0042] 2) In a 1L round-bottomed flask equipped with a thermometer, stirrer, reflux condenser and nitrogen purging device, add 300g of distilled water, stir, and use nitrogen purging to remove the oxygen in the system, and then pour it into the flask once under the protection of nitrogen. Add 360g isopentenol polyoxyethylene ether (TPEG-2400), stir and dissolve, then heat up to 65°C to obtain aqueous solution A;

[0043] 3) Mix 8.5g of itaconic acid, 30g of acrylic acid, 0.8g of 3-mercaptopropionic acid, 20g of acryloyloxyethyltrimethylammonium chloride and ...

Embodiment 3

[0047] A cationic modified polycarboxylate water reducer, the preparation method of which comprises the steps of:

[0048] 1) Accurately weigh 360 g of monomer a isopentenol polyoxyethylene ether, monomer b methacrylic acid 23 g, cationic monomer c acryloyloxyethyl dimethyl benzyl ammonium bromide 16 g and monomer d horse Toric anhydride 10g, initiator potassium persulfate 2g and chain transfer agent mercaptoacetic acid 0.5g;

[0049] 2) In a 1L round-bottomed flask equipped with a thermometer, stirrer, reflux condenser and nitrogen purging device, add 300g of distilled water, stir, and use nitrogen purging to remove the oxygen in the system, and then pour it into the flask once under the protection of nitrogen. Add 360g isopentenol polyoxyethylene ether (TPEG-2400), stir and dissolve, then heat up to 50°C to obtain aqueous solution A;

[0050] 3) 10g of maleic anhydride, 23g of methacrylic acid, 0.5g of mercaptoacetic acid, 16g of acryloyloxyethyl dimethyl benzyl ammonium br...

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Abstract

The invention discloses a cation modified polycarboxylate superplasticizer which is characterized by being prepared from isoamyl alcohol polyoxyethylene ether monomer a, unitary unsaturated carboxylic acid and a derivative monomer b thereof, cationic monomer c as well as binary unsaturated carboxylic acid and a derivative monomer d thereof through copolymerization in a 7-70 DEG C water solution for 3-8h under the action of an initiator e and a chain transfer agent f and addition of alkali to realize neutralization until the pH is 5-8. Compared with the traditional anionic polycarboxylate superplasticizers, the cation modified polycarboxylate superplasticizer can be adsorbed on the surfaces of cement minerals with positive charge and negative charge when being added into concrete as a cation group is introduced into the molecular structure, and undergoing molecular chain extension in cement paste alkaline environment due to the existence of antipolyelectrolyte effect to make the adsorption form more stretch, so that the water reducing rate of the superplasticizer is higher and the cement particles can be dispersed more sufficiently.

Description

technical field [0001] The invention relates to a cationic modified polycarboxylate water reducer and a preparation method thereof, belonging to the technical category of building material admixtures. Background technique [0002] The concrete polycarboxylate water reducers that have been reported so far are basically anionic polymers. The polycarboxylate water reducers are positively charged to the cement paste through the anionic functional groups (carboxyl or sulfonic acid groups) on the main chain of the molecule. The adsorption of cement minerals makes the polycarboxylate superplasticizer molecules adsorb on the surface of cement particles, and disperses the cement particles through the steric hindrance of long side chains. The electrostatic adsorption and the steric hindrance of molecular side chains make the cement particles dispersion. [0003] Yoshioka studied the adsorption of superplasticizers on mineral surfaces, and the results showed that polycarboxylate super...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08F220/34C08F222/06C08F222/02C08F226/02C04B103/30
Inventor 毕耀郑广军傅承飞高育欣李兴邢菊香孙冲王少峰汪金文熊龙
Owner CHINA STATE CONSTR READY MIXED CONCRETE CO LTD
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