Single-component polyuria preventive coating for agricultural irrigation concrete drainage channel and water duct, and preparation method of single-component polyuria preventive coating

Abstract

The invention discloses a single-component polyuria preventive coating for an agricultural irrigation concrete drainage channel and a water duct. The single-component polyuria preventive coating comprises the following raw materials in parts by weight: 20-70 parts of isocyanate, 50-85 parts of polyether polyol, 4-24 parts of a hindered amine compound, 15-40 parts of a solvent, 10-40 parts of packing, 2-5 parts of auxiliaries, 1-3 parts of pigments, and 1-3 parts of a catalyst. In the synthesis of the single-component polyuria preventive coating, the hindered amine compound is added, so that urea radicals are introduced into the components, the polarity of the component is increased, the attraction of hard segments of the material can be increased, the material is more compact, and the oil resistance, medium resistance and microorganism resistance of the material can be improved. In addition, the mechanical property of single-component polyuria is far higher than the conventional single-component polyurethane.

Description

Technical field [0001] The invention relates to polyurea technology, in particular to a single-component polyurea protective coating for agricultural irrigation concrete drainage channels and water pipes and a preparation method thereof. Background technique [0002] With the development of agricultural economy and the improvement of agricultural irrigation systems, the construction of water delivery systems is particularly important. The drainage channels and water pipes used in agricultural water delivery systems are mostly made of concrete, which have the advantages of easy production, impact resistance, compression resistance, and wear resistance. Their laying generally adopts buried and semi-buried methods. In agricultural water delivery and irrigation Plays a pivotal role. However, because concrete is alkaline and porous, its internal structure contains a large number of capillary pores, which provide channels for the circulation of gas and liquid. When the concrete base ...

AI Technical Summary

Problems solved by technology

Spray polyurea elastomer technology is expensive for small area or small project construction, which is not conducive to popularization, and engineering construction is limited, which hinders the development of polyurea materials

Moreover, the gelation time after spraying polyurea is short, only a short tens of seconds, and the curing speed is fast. During the construction of joints, corners, pipe seals, etc., it is easy to have uneven spray thickness and spray leakage. It is not conducive to construction in narrow and complex environments and working conditions, which hinders the development and application of polyurea materials

That is, the existing spray polyurea elastomer technology, the equipment is expensive, and the cost of small-scale construction is high

Moreover, this type of material has a fast curing speed, and the construction on complex interfaces is cumbersome, which seriously affects the construction quality

The laying of water pipelines for agricultural irrigation is mostly carried out in the vast field, and the shortage of oil and electricity seriously restricts the use of spraying machines

And the expensive equipment price, the complexity of the environment and the difficulty of construction have affected the development of spray polyurea in agriculture.

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