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

A technology for protective coatings and agricultural irrigation, applied in the field of polyurea, can solve the problems of high cost of small-scale construction, hinder the development of polyurea materials, and complex environment, and achieve simple and convenient construction methods, prolong operation time, and reduce use costs. Effect

Inactive Publication Date: 2014-12-10
大连怿文新材料科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] This embodiment discloses a single-component polyurea protective coating for agricultural irrigation concrete drainage channels and water pipes, including the following components in weight ratio:

[0032]

[0033] The one-component polyurea protective coating is prepared by the following steps:

[0034] Add polyoxypropylene ether polyol PPG-1000, Desmophen NH1420, 800 mesh talc and carbon black into the container according to the above weight ratio, stir the liquid material at low speed for 5 minutes, heat it to 110-120°C, turn on the vacuum pump, The vacuum degree is -0.1~-0.08MPa, vacuum dehydration is 2h, the small amount of water contained in the raw material is removed, the water content is detected to be below three ten thousandths, and the liquid material temperature is about 25℃; then butyl acetate and HMDI are added Into the container, the temperature is raised to 50°C, and the reaction is stirred for 1 hour. After the exothermic reaction is over, add diphenylmetha...

Embodiment 2

[0041] This embodiment discloses a single-component polyurea protective coating for agricultural irrigation concrete drainage channels and water pipes, including the following components in weight ratio:

[0042]

[0043]

[0044] Add the polyoxypropylene ether polyol PPG-2000, Desmophen NH1420, 800 mesh talc and carbon black into the container according to the above weight ratio, stir the liquid at low speed for 5 minutes, then heat it to 110-120°C, turn on the vacuum pump, The vacuum degree is -0.1~-0.08MPa, and the vacuum dehydration is 2h to remove a small amount of water contained in the raw material. The detected moisture content reaches below three ten thousandths, and the liquid material temperature is cooled to about 25°C. Then add butyl acetate and hexamethylene diisocyanate trimer to the container, raise the temperature to 50°C, stir and react for 1 hour, after the end of the reaction exotherm, add MDI and dibutyltin dilaurate, and slowly raise the temperature to 70 ~8...

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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 ...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D7/12C08G18/48
Inventor 姜鹏波季春波史立彤李同信车栋王坤
Owner 大连怿文新材料科技发展有限公司
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