A low-cost and high-slump modified naphthalene-based high-efficiency water reducer and its preparation method

Abstract

The invention discloses a low-cost modified naphthalene-based superplasticizer with high slump-keeping property and a preparation method thereof. The superplasticizer is prepared from the following components in parts by weight: 120-130 parts of industrial naphthalene oil, 50-60 parts of 80% petroleum waste phenol residue, 100-120 parts of concentrated sulphuric acid, 40-80 parts of formaldehyde, 80-100 parts of 30% alkaline solution, 20-40 parts of 35% papermaking black liquor, 12-20 parts of sulphur dioxide and a right amount of water. The prepared superplasticizer is low in production cost, the preparation method is simple and short in period, the problem that cost of naphthalene-based chemical modification is always high is solved, mixed concrete is relatively soft, does not adhere to bottom and has better workability and slump-keeping property, and bleeding ratio is low, so that concrete reinforcement effect is obvious.

Description

technical field [0001] The invention relates to the field of concrete materials, in particular to a modified naphthalene-based high-efficiency water reducer with low cost and high slump retention and a preparation method thereof. Background technique [0002] Traditional concrete materials are composed of cement, aggregate and water. With the advancement of civil engineering technology, high-performance concrete has become an important part of civil engineering materials and is widely used in the construction of large buildings, bridges and marine structures. The key to preparing high-performance concrete is the use of high-efficiency water-reducing agents. The use of high-efficiency water-reducing agents can increase the fluidity of concrete and reduce water consumption in concrete materials by 20-30%. The application of high-efficiency water-reducing agents makes the preparation of high-durability concrete materials a Possibly, superplasticizers have become an important pa...

AI Technical Summary

Problems solved by technology

General chemical modification costs are high and the cycle is long, so naphthalene-based water reducers have been mainly used for physical modification for a long time.

[0004] At present, the production of naphthalene series is mostly synthesized from raw materials such as industrial naphthalene, concentrated sulfuric acid, formaldehyde, and liquid caustic soda. The cost is high, the extraction of industrial naphthalene is difficult, and the production process consumes a lot of energy. There are few studies on the use of various waste liquids for the synthesis of naphthalene series. academic research

At present, the content of sodium sulfate in domestic naphthalene-based water reducers is generally high, and it is easy to precipitate when the temperature is low, making it difficult to use

There are many coal chemical industries in China, and the output is relatively large, but the naphthalene oil produced by coal chemical industry contains a large amount of naphthalene, and the processing process is complicated, consumes a lot of energy, and causes great environmental pollution.

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