Preparation method of cement water repellent

Abstract

The invention discloses a preparation method of a cement water repellent, and the preparation method comprises the following steps: heating and melting a higher fatty acid, adding a compound emulsifier for emulsification, then simultaneously dropwise adding an alkaline compound and a catalyst at 75-80 DEG C within 2-3 hours, and after adding, continuing to react for 0.5 to 1 hour to obtain the cement water repellent; the compound emulsifier is compounded by a non-ion emulsifier and an anionic emulsifier, and the weight ratio of the two is 1:1 to 1:2. The cement water repellent is simple in synthetic process and short in reaction time; by use of the compound emulsifier, the reaction is complete; and the cement water repellent has the advantages of small size, low viscosity, low use amount, excellent water proof and water repellent performances and good storage stability, and may not return yellow.

Description

technical field [0001] The invention relates to a preparation method of cement water repellent. Background technique [0002] There are many types of water-repellent and hydrophobic products for construction in the market, including powder, paste, and emulsion. Among them, the emulsion-type water-repellent is popular because of its convenience. [0003] Waterproof and hydrophobic agents are generally divided into two types: one is non-reactive, mixed in cement mortar, concrete, and gypsum, and its active ingredients and inorganic substances are only inert and mechanically filled with each other. This type of waterproof 1. The amount of water-repellent agent is large, and the effect is not long-lasting; the other type is reactive, that is, a chemical reaction occurs between the waterproof and water-repellent active ingredients and the cement hydration product to form an interface structure bonded by chemical bonds. The enhancement of the interface leads to the improvement of...

AI Technical Summary

Problems solved by technology

[0004] Zhang Jie used stearic acid, potassium hydroxide, triethanolamine, citric acid, silicone oil, and emulsifiers to prepare waterproof and hydrophobic agents in TECHNOLOGY (2004 / 7) "The Production of Waterproof and Hydrophobic Agents" through internal blending and external coating. In cement mortar, concrete, and gypsum, the waterproof and hydrophobic effects are better, but the cost of the waterproof and water-repellent agent is relatively high, and it has obvious defoaming side effects when used in air-bubble mixed lightweight concrete

The cement water repellent prepared by patent 2006100706648.1 has a high viscosity, and the preparation process is relatively complicated; the cement water repellent prepared by the method of patent 200810035266.4 takes a long time to prepare, and it will turn yellow when stored for more than half a year