Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof

A technology of branched polycarboxylic acid and superplasticizer, which is applied in the field of multi-branched polycarboxylate superplasticizer and its preparation, which can solve the problem of poor water solubility of crosslinking agent, affecting the state of superplasticizer, and unsatisfactory crosslinking effect, etc. problems, achieve the effects of improved freeze-thaw resistance, far-reaching environmental protection, and improvement of cement sensitivity and unsuitable problems

CN101851323AActive Publication Date: 2010-10-06浙江五龙新材股份有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-10-06

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Abstract

The invention relates to a plastic retaining agent for newly mixed cement paste, mortar, concrete and the like, in particular to a multi-branched polycarboxylic water reducer with an excellent function of slump protection and a preparation method thereof. The water reducer is prepared with the following monomers through aqueous solution polymerization under the effect of a polymerization initiator: a monomer a of 30-60 percent of the total weight of reactants, a monomer b of 20-50 percent of the total weight of the reactants, a monomer c of 10-30 percent of the total weight of the reactants, and a monomer d of 5-15 percent of the total weight of the reactants. The multi-branched polycarboxylic water reducer still has an excellent performance of maintaining the plasticity of the concrete under the low dosage, and even in construction at the high temperature in summer, the slump loss of the fresh concrete is small, the scope of application in the cement is wide, and no obvious delayed coagulation occurs to the concrete. Therefore, the invention greatly improves the early and late strength of the concrete.
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Description

technical field

[0001] The invention relates to a plastic retaining agent for freshly mixed cement slurry, mortar, concrete, etc., in particular to a multi-branched polycarboxylate water reducer with excellent slump retention performance and a preparation method thereof. technical background

[0002] With the rise and rapid development of a large number of projects such as transportation, water conservancy, bridges, and municipal engineering, concrete, as the most basic material of construction, plays an increasingly important role. Especially in recent years, the construction of some major national projects has increased the performance requirements of concrete according to the design standards of a century-old project. Not only are the requirements for traditional testing indicators constantly increasing, but the durability of concrete and the service life of concrete are more concerned by the construction industry. At the same time, for different projects, the constructi...

Examples

Embodiment 1

[0042] Monomer a 128.8g

[0043] (Maleic anhydride methoxypolyethylene glycol ether diester, the number of EO added is n=13)

[0044] Monomer b 106.7g

[0045] (methoxypolyethylene glycol methacrylate, the number of added EO is m=28)

[0046] Monomer c 67.9g

[0047] (Propyl alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=28)

[0048] Monomer d 19.6g

[0049] (maleic anhydride)

[0050] Put 268g of water and monomer a into a four-necked reaction flask, purged with nitrogen, heated to 70°C with an oil bath, and added dropwise the aqueous solution composed of monomer b, monomer c, monomer d and 48.5g of water and 130 g of 5% ammonium persulfate in water. Use a certain period of time to evenly add the initiator, wherein the initiator is added later than the aqueous solution of the polymerizable monomer. After the dropwise addition, keep warm for 2 hours, lower the temperature to 30° C., adjust the pH value of the reactant to 6.0-6.5 with 4...

Embodiment 2

[0052] Monomer a 128.8g

[0053] (Maleic anhydride methoxypolyethylene glycol ether diester, the number of EO added is n=13)

[0054] Monomer b 127.4g

[0055] (methoxypolyethylene glycol methacrylate, the number of added EO is m=46)

[0056] Monomer c 65.3g

[0057] (Propyl alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=46)

[0058] Monomer d 21.6g

[0059] (maleic anhydride)

[0060] Put 270g of water and monomer a into a four-necked reaction flask, purged with nitrogen, heated to 70°C with an oil bath, and added dropwise the aqueous solution composed of monomer b, monomer c, monomer d and 53.6g of water and 150g of 5% sodium persulfate aqueous solution. Use a certain period of time to evenly add the initiator, wherein the initiator is added later than the aqueous solution of the polymerizable monomer. After the dropwise addition, keep the temperature for 2 hours, lower the temperature to 100%, adjust the pH value of the reactant to ...

Embodiment 3

[0062] Monomer a 128.8g

[0063] (Maleic anhydride methoxypolyethylene glycol ether diester, the number of EO added is n=13)

[0064] Monomer b 130.0g

[0065] (methoxypolyethylene glycol acrylate, the number of added EO is m=35)

[0066] Monomer c 55.4

[0067] (Propyl alcohol polyoxyethylene ether maleic anhydride ester, the number of EO added is p=28)

[0068] Monomer d 21.6g

[0069] (acrylic acid)

[0070] Put 269g of water and monomer a into a four-necked reaction flask, purged with nitrogen, heated to 35°C with an oil bath, and added 27.5% H 2 o 2 3.6g, the aqueous solution composed of monomer b, monomer c, monomer d and 69g water and 125g 3% formaldehyde and sodium bisulfite aqueous solution were added dropwise. Use a certain period of time to evenly add the initiator, wherein the initiator is added later than the aqueous solution of the polymerizable monomer. After the dropwise addition, keep the temperature for 2 hours, lower the temperature to 100%, adjust t...