A kind of preparation method of anti-mud type polycarboxylate water reducer

Abstract

The invention discloses a muddy-resistant polycarboxylate water-reducer and a preparation method thereof. The muddy-resistant polycarboxylate water-reducer comprises the following raw materials: a maleic acid, triethanolamine, polyoxyethylene monomethyl ether, acrylamide, a crylic acid, isoamyl polyoxyethylene ether, a maleic acid grafted glucose phosphate derivative and water. The preparation method for the muddy-resistant polycarboxylate water-reducer is green and environmental, the water reducing dispersibility is good, the muddy-resistant effect is remarkable, the adaptability to mud-containing aggregate is strong, and the cost performance is high. The production process is green and environmental without the three waste emission, and accords with a concept of green and environmental protection and sustainable development.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a preparation method of a high-performance polycarboxylate concrete water reducer with anti-mud function. Background technique [0002] With the development of construction technology, the trend of high-performance concrete is becoming more and more obvious. Due to the great advantages of water reducing agent in improving concrete workability, strength and durability, it has become an indispensable fifth component in concrete. At present, the coagulation superplasticizer has developed from the early generation of lignosulfonate, sugar calcium and the second generation of naphthalene series and aliphatic high-efficiency superplasticizers to the third generation of high-performance polycarboxylate superplasticizers, and the annual usage continues to increase. It has become an important market in the field of building materials. The third-generation polycarboxylate superplasticiz...

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Problems solved by technology

The third method of using a sacrificial agent is relatively simple and effective. The sacrificial agent is preferentially adsorbed by the mud to reduce the loss of the polycarboxylate superplasticizer being adsorbed by the mud. Polyoxyethylene ethers with similar structures are used as raw materials, and the price of raw materials and application costs are relatively high, which limits the application and promotion of this method

[0007] At present, the main problems of the molecular modification method of polycarboxylate superplasticizer are as follows: 1. The preparation process of quaternary ammonium salt is relatively complicated, which will weaken the adsorption and positioning effect of polycarboxylate superplasticizer on the positively charged cement particle surface, 2. The introduction of phosphonic acid or sulfonic acid derivatives into the main chain of polycarboxylic acid molecules requires double bonds to participate in the initiation of copolymerization, while vinyl phosphonate, vinyl sulfonate, and allyl phosphine Allyl sulfonate and allyl sulfonate are expensive fine chemicals, and the application cost is high. The sulfonic acid group is not effective when used alone, and the more expensive alkenyl phosphonate plays a major role; 3. Allyl hydroxyethyl ester and allyl hydroxypropyl ester can play a slow-release effect, so as to obtain the effect similar to the "pre-mixing method" of water reducing agent, saving the amount of water reducing agent, but it does not change the clay's effect on clay in essence. Competitive adsorption of polycarboxylic acid molecules, and the unit price is relatively expensive

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