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Sorbitol modified polycarboxylate-type water reducing agent and synthetic method thereof

A technology of polycarboxylate and sorbitol acrylate, which is applied in the field of building materials to achieve high construction requirements, enhanced fluidity, and low slump loss

Inactive Publication Date: 2015-05-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no research results on the synthesis process in China (Wang Ling, Gao Ruijun. The development history and research direction of polycarboxylate superplasticizer [J]. Concrete World. 2012, 11:54-57.)

Method used

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  • Sorbitol modified polycarboxylate-type water reducing agent and synthetic method thereof
  • Sorbitol modified polycarboxylate-type water reducing agent and synthetic method thereof
  • Sorbitol modified polycarboxylate-type water reducing agent and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Synthesis of polyethylene glycol monomethyl ether acrylate:

[0026] Add acrylic acid, polyethylene glycol monomethyl ether, polymerization inhibitor hydroquinone, catalyst p-toluenesulfonic acid, and solvent toluene into a 100mL round bottom flask, blow nitrogen, heat to 120°C, keep stirring, keep warm for 5-6h, and react After the end, the solvent toluene is removed to obtain polyethylene glycol monomethyl ether acrylate (MPA); the molar ratio of acrylic acid to polyethylene glycol monomethyl ether (Mn=600-2000) is 1:3, and the amount of polymerization inhibitor is 3% of the molar weight of acrylic acid, and the catalyst dosage is 4% of the total mass of acrylic acid and polyethylene glycol monomethyl ether.

[0027] 2. Synthesis of sorbitol acrylate (ASB):

[0028] Dissolve sorbitol and acryloyl chloride in DMF respectively, drop the DMF solution of acryloyl chloride into the DMF solution of sorbitol in an ice-water bath, stir and react at room temperature for 10...

Embodiment 2

[0033] The preparation method of step 1 and step 2 in this embodiment is the same as that of embodiment 1.

[0034] 3. Monomer copolymerization:

[0035] Dissolve sorbitol acrylate, acrylic acid, sodium methacrylate, and polyethylene glycol monomethyl ether acrylate in deionized water at a molar ratio of 0.5:3.5:1:1 to obtain a mixed monomer solution. The monomer mass concentration Add the initiator ammonium persulfate to deionized water to obtain the initiator solution, add the mixed monomer solution and the initiator solution to the reactor at room temperature and drop them at the same time, and the dropping time is about 30 minutes , after dripping, raise the temperature to 80°C and keep it warm for 6 hours. After the reaction, adjust the pH value of the system to 7-8 with 20wt% sodium hydroxide solution to obtain a sorbitol-modified polycarboxylate water-reducer with a solid content of 20%. ; Wherein the addition of the initiator is 2.5% of the total mass of the monomer. ...

Embodiment 3

[0038] The preparation method of step 1 and step 2 in this embodiment is the same as that of embodiment 1.

[0039] 3. Monomer copolymerization:

[0040] Dissolve sorbitol acrylate, acrylic acid, sodium methacrylate, and polyethylene glycol monomethyl ether acrylate in deionized water at a molar ratio of 0.5:3.5:1:1 to obtain a mixed monomer solution. The monomer mass concentration Add the initiator ammonium persulfate to deionized water to obtain the initiator solution, add the mixed monomer solution and the initiator solution to the reactor at room temperature and drop them at the same time, and the dropping time is about 30 minutes , after dripping, raise the temperature to 80°C and keep it warm for 6 hours. After the reaction, adjust the pH value of the system to 7-8 with 20wt% sodium hydroxide solution to obtain a sorbitol-modified polycarboxylate water-reducer with a solid content of 20%. ; Wherein the addition of the initiator is 1.5% of the total mass of the monomer. ...

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Abstract

The invention discloses a sorbitol modified polycarboxylate-type water reducing agent and a synthetic method thereof. The structural general formula of the sorbitol modified polycarboxylate-type water reducing agent is described in the specification, wherein m, n, x, y and z are used for showing polymerization degree, m=1-5, n=12-44, x=5-9, y=4-12, and z=3-6. Molecular weight of the polycarboxylate-type water reducing agent is 10000-50000. Compared with an unmodified water reducing agent, the sorbitol modified polycarboxylate-type water reducing agent has the advantages that water reducing rate is high, slump loss is less, strength of concrete can be improved if a small amount of water reducing agent (0.2% of the weight of cement generally) is doped into the concrete, and higher construction requirement is met.

Description

1. Technical field [0001] The invention belongs to the technical field of building materials, and relates to a polycarboxylate concrete water reducer containing sorbitol acrylate (ASB) and a synthesis method thereof. 2. Background technology [0002] Polycarboxylate water reducer is essentially a kind of polymer surfactant, which is mainly used to improve the fluidity of concrete, control the setting or hardening time, and improve the strength of concrete. Polycarboxylate superplasticizer has excellent properties such as low dosage, high water reducing rate, slow setting, low slump loss, production and environmental protection. In addition to being suitable for ordinary concrete, it is also suitable for preparing high-strength, self-compacting, clear water Concrete and other special concrete. Widely used in national key projects, especially transportation, water conservancy projects, etc. (Shi Caijun, He Fuqiang, Liu Hui, etc. Recent research progress of polycarboxylic acid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/28C04B24/16C04B103/30
Inventor 王文平汪慧唐家元祝悦
Owner HEFEI UNIV OF TECH