Method for preparing anti-freeze type high-performance polycarboxylate water reducer by utilizing amino resin waste liquid

Abstract

The invention relates to the technical field of preparation of polycarboxylate water reducers, in particular to a method for preparing an anti-freeze type high-performance polycarboxylate water reducer by utilizing an amino resin waste liquid. The method comprises the following steps: firstly taking methyl allyl polyoxyethylene ether, methacryloxy ethyl trimethylammonium chloride, maleic anhydride, hydrogen peroxide and a proper amount of deionized water as base materials to put in a reaction kettle, stirring till complete dissolution and then increasing the temperature; after the base materials are dissolved, simultaneously dropwise adding a solution A and a solution B and continuously performing stirring reaction after the end of dropwise adding; then regulating a pH value of a mixed solution to obtain a polycarboxylate water reducer and compounding with the amino resin waste liquid in proportion to prepare. The method provided by the invention has the benefits that as methyl propylene oxiranyl trimethyl ammonium chloride as a cationic functional monomer is introduced, a certain complex can be formed, so that the compactness of a structure self can be improved; the added amino resin waste liquid containing methanol can prevent concrete from freezing, so that the compressive strength, the compactness and the durability of the concrete are not affected.

Description

technical field [0001] The invention relates to the technical field of preparing polycarboxylate water-reducers, in particular to a method for preparing antifreeze-type high-performance polycarboxylate water-reducers by using amino resin waste liquid. Background technique [0002] The weather in the vast northern regions of my country is usually relatively cold, and the winter lasts from April to June, which has a great impact on concrete engineering construction. When the temperature rises, the hydration is accelerated and the strength increases rapidly; when the temperature drops to 0°C, part of the water in the concrete begins to freeze, gradually changing from liquid phase to solid phase. At this time, the water participating in the cement hydration is reduced, so the hydration is slowed down and the strength growth is correspondingly slower. The temperature continues to drop. When the water in the concrete completely turns into ice, that is, when it completely changes ...

AI Technical Summary

Problems solved by technology

The water-reducing components of these antifreeze agents not only have a high alkali content, but also contain residual formaldehyde, which is poor in environmental protection. In addition, the water-reducing rate is not high, and the adaptability to cement and sand and gravel materials is poor, and it is difficult to meet the requirements of today's high-performance concrete. , the chloride ion content and sulfate content in the antifreeze component are very high, which is not conducive to improving the compactness and durability of concrete

Small molecule alcohols are a better antifreeze agent, but the dosage is relatively high, and the price of the overall water reducer is relatively high. The waste water from the production of amino resin contains a large amount of methanol and butanol, which are usually treated as waste water, which will cause waste of resources.

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