Agent of anti dirt of allylloxy polyether, and preparation method

Abstract

This invention relates to a method for preparing allyloxy polyether scale inhibitor, which is a stable, phosphorus-free, biodegradable and environmentally friendly scale inhibitor. The scale inhibitor is a mixture of free radical copolymerization product of allyloxy polyether monomer and vinyl-containing monomer 80-90 wt.%, and graft-copolymerization product of allyloxy polyether monomer and maleic anhydride-acrylic acid copolymer 10-20 wt.%. The method comprises: (1) reacting allyloxy polyethoxy ether, amino sulfonic acid and urea under nitrogen protection to obtain allyloxy polyethoxy ammonia sulfonate; (2) mixing with maleic anhydride-acrylic acid copolymer, and adding water to obtain an aqueous solution; (3) adding initiator solution and maleic anhydride solution at a uniform speed; (4) reacting for 0.5-5 h to obtain the product.

Description

technical field [0001] The invention relates to the preparation of a stable, phosphorus-free and biodegradable green allyloxy polyether scale inhibitor, which belongs to the scale inhibitor preparation technology in the technical field of water treatment and is suitable for industrial cooling water circulation systems. Background technique [0002] Corrosion, scaling and microbial growth are the three major problems in the industrial cooling water circulation system. Therefore, the cooling water treatment chemicals are mainly composed of corrosion inhibitors, scale inhibitors and bactericides. Dispersed microcrystals and lattice distortion can prevent the deposition of scale-causing salts in water on the surface of equipment. Since scaling of equipment will reduce heat transfer efficiency and cause under-scale corrosion, it is important to use high-efficiency scale inhibitors to inhibit scale formation. One of the key technologies to keep the cooling water circulation system...

AI Technical Summary

Problems solved by technology

[0003] At present, the research on scale inhibitors at home and abroad mainly focuses on organic polyphosphoric acid scale inhibitors and polycarboxylic acid scale inhibitors. Among them, organic polyphosphoric acid scale inhibitors have stable chemical properties, can withstand high temperature and pH, and are effective. Obvious solubility limit effect and synergistic effect, etc., prevent CaCO 3 Because of its high scale efficiency, it has been widely used, such as aminotrimethylene phosphoric acid (ATMP), hydroxyethylene diphosphonic acid (HEDP), 2-phosphorylbutane-1,2,4-tricarboxylic acid (PBTCA ), etc., but such antiscalants cannot effectively inhibit Ca 3 (PO 4 ) 2 Scale and Zn scale cannot solve the problem of iron oxide precipitation, and they are easy to form organic phosphate scale. At the same time, phosphorus-containing antiscalants are also easy to cause eutrophication of environmental waters, promote the growth of bacteria and algae and form red tides, causing water pollution.

Therefore, the development of low-phosphorus or phosphorus-free new green scale inhibitors has become a difficult and hot spot in the research of scale inhibitors. In 2002, the American Betz Company launched a new generation of acrylic acid / allyloxypolyethoxysulfonate phosphorus-free copolymer (AA / APES), due to the use of new allyloxypolyethoxysulfonate comonomers in the preparation, the prepared AA / APES scale inhibitor has a higher tolerance to hardness, suspended solids, and temperature force, and can withstand the interference of iron ions and halogen resistance, its resistance to Ca 3 (PO 4 ) 2 Higher efficiency. In 2003, Betz developed a trimer of APES to further optimize product performance and reduce production costs. However, the disadvantage of this type of scale inhibitor is that it inhibits CaCO 3 poor performance of

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