Preparation method for anti-mud polycarboxylate water reducing agent used for polyether with molecular weight of 3,000

Abstract

The invention provides a preparation method for an anti-mud polycarboxylate water reducing agent used for polyether with a molecular weight of 3,000. The preparation method comprises the following steps: 1) adding polyether macromonomers with a molecular weight of 3,000, phenylcarboxylic acid functional monomers, phosphate functional monomers and water in a certain mass ratio a reaction kettle, and carrying out stirring and heating to dissolve the above substances; 2) controlling a temperature at 46-52 DEG C, and then beginning to add a certain amount of hydrogen peroxide; 3) in 5 minutes, adding a solution B drop by drop, and starting dropwise addition of a solution A within 10 minutes after the completion of addition of the solution B, wherein the dropwise addition time of the solution Ais a hours, a is in a range of 2 to 4, the dropwise addition time of the solution B is (a+0.5) hours, the solution A is composed of acrylic acid, unsaturated sulfonate and water in a certain mass ratio, and the solution B is composed of ascorbic acid, a chain transferring agent and water in a certain mass ratio; and 4) after the completion of the dropwise addition, keeping a temperature constant,carrying out curing for 1-3 hours, slowly adding a certain amount of a neutralizer when the temperature of a reaction solution is lower than 30 DEG C, and supplementing water to 1000 parts so as to obtain the anti-mud polycarboxylate water reducing agent used for polyether with a molecular weight of 3,000 and having a mass fraction of 40%.

Description

technical field [0001] The invention belongs to the technical field of building materials and relates to the field of concrete admixtures, in particular to a method for preparing a mud-resistant polycarboxylate water reducer for polyether with a molecular weight of 3000. Background technique [0002] As an important part of high-performance concrete, superplasticizers develop very rapidly. With the continuous expansion of scale, higher requirements are put forward for the water reducing rate, slump retention and adaptability of superplasticizers. Nowadays, the problem of the reduction of high-quality sand and gravel resources, the use of secondary materials for sand and gravel continues to increase, and the mud content in sand and gravel materials has a trend of increasing. There are many unsuitable situations, and it is urgent to have new design ideas and products with new molecular configurations to supplement. For sand and gravel materials with high mud content, the clay...

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Problems solved by technology

For sand and gravel materials with high mud content, the clay-like strong adsorbent often has a layered structure. In this case, the length of the main chain and side chain of ordinary polycarboxylate superplasticizer is difficult to exert its effect. The entire chain will enter the interlayer pores of the clay, which cannot exert steric hindrance; the main chain length and side chain density configuration of ordinary water reducers also make the molecules of water reducers easily bound by strong adsorbates It makes it difficult for the entire water reducer molecule to break free and lose its dispersion effect

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