Polycarboxylate superplasticizer with mud preventing effect and preparation method of polycarboxylate superplasticizer

Abstract

The invention discloses a polycarboxylate superplasticizer with a mud preventing effect. The structural general formula of the polycarboxylate superplasticizer is as shown in the description, wherein R1 is H or CH3, R2 is H or COOM, R3 is an alkyl of C1 to C3, and M is H, Na, K or NH4. The invention also provides a preparation method of the polycarboxylate superplasticizer with the mud preventing effect. The superplasticizer synthesized by use of the process is applied to concrete within the aggregate mud content range of 0-8%, and a good application effect can be obtained through direct use without physical compounding.

Description

technical field [0001] The invention belongs to the technical field of chemical building materials construction, and in particular relates to a polycarboxylate water reducer with mud-resistance effect and a preparation method thereof. Background technique [0002] In the northern region, the sand and stone materials currently used in most mixing plants are of poor quality, and the mud content or stone powder content is high. In order to make the concrete achieve the initial effect, the amount of polycarboxylate superplasticizer will be increased during the production process. This usually leads to bleeding during construction when the base material changes, segregation during pumping, etc., which cannot meet the requirements of actual construction. To solve this problem, the most commonly used methods are as follows: [0003] 1: Change to a naphthalene-amino-aliphatic compound water reducer that is less sensitive to fluctuations in mud content. In autumn and winter, it is ea...

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Problems solved by technology

[0002] In the northern region, the sand and stone materials currently used in most mixing plants are of poor quality, and the mud content or stone powder content is high. In order to make the concrete achieve the initial effect, the amount of polycarboxylate superplasticizer will be increased during the production process. This usually leads to bleeding during construction when the base material changes, segregation during pumping, etc., which cannot meet the requirements of actual construction. To solve this problem, the most commonly used methods are as follows:

[0003] 1: Change to a naphthalene-amino-aliphatic compound water reducer that is less sensitive to fluctuations in mud content. In autumn and winter, it is easy to crystallize and precipitate, which requires heating and heat preservation, which causes inconvenience to production;

[0004] 2: Compounding sodium tripolyphosphate, EDTA-4 sodium salt and other inorganic salts with dispersion and chelation effects in the mother liquor of the water reducer will precipitate out after a long time of storage, resulting in unstable quality of the mother liquor;

[0006] The above methods are difficult to meet the actual needs

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