Solvent-free polyurea weather-resistant anticorrosion coating and method for preparing same

An anti-corrosion coating, solvent-free technology, applied in the direction of anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problem of affecting the mechanical properties and anti-corrosion properties of the coating, cannot completely prevent the reaction of polyisocyanates, and has not been popularized and applied And other problems, to achieve super anti-ultraviolet aging performance, super salt spray resistance performance, good low temperature flexibility

Inactive Publication Date: 2019-03-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the structure contains ether bonds, long-term sunlight exposure is easy to break the chain, and the weather resistance is poor; when the secondary hydroxyl polyester polyether polyol reacts with the polyisocyanate polymer curing agent, the reaction speed is slow, and it is necessary to add a curing accelerator. Otherwise, the trace moisture in component A and the moisture in the air will react with the polyisocyanate first, so that the cured coating will contain more air bubbles; even if the curing accelerator is added to the curing agent, It cannot completely prevent the reaction of polyisocyanates with water and moisture. After the coating is cured, there will still be a certain number of air bubbles, which will affect the mechanical properties and anti-corrosion properties of the entire coating. Therefore, it has not been popularized and applied in China so far.

Method used

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  • Solvent-free polyurea weather-resistant anticorrosion coating and method for preparing same
  • Solvent-free polyurea weather-resistant anticorrosion coating and method for preparing same
  • Solvent-free polyurea weather-resistant anticorrosion coating and method for preparing same

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preparation example Construction

[0033] Described in the embodiment of the present invention is a method for preparing a solvent-free polyurea weather-resistant anti-corrosion coating, the method comprising:

[0034] Step 1. Add secondary amino polymer, dispersant, defoamer and thixotropic agent in sequence in proportion to the batching tank, and stir at a stirring speed of 1000 rpm for 15-20 minutes. After stirring evenly, reduce the stirring speed to 200 rev / min;

[0035] Step 2. Add coupling agent, titanium dioxide, sericite and glass powder to the batching tank in turn, and stir for 35 to 50 minutes at a stirring speed of 400 to 500 rpm;

[0036] Step 3, use a sand mill to grind the prepared mixture, and test the fineness of the mixture during the grinding process, stop grinding until the fineness reaches below 100 μm, and obtain component B;

[0037] Step 4. Separately package the components A and B according to the ratio to obtain the solvent-free polyurea weather-resistant anticorrosion coating. The c...

Embodiment 1

[0040] (1) Preparation of component A: Open the lid of the directly purchased HDI trimer (imported) in 200L packaging, visually observe whether it is clear, whether there are flocculation products, stir, and check whether there are hard sediments at the bottom, such as If the above phenomenon occurs, mark it and place it uniformly for return or exchange. If there is no above phenomenon, subcontract according to the proportion. Get A component;

[0041] (2) Preparation of component B: Add 42 parts of secondary amino polymer, 0.3 part of dispersant, 0.3 part of defoamer, and 0.8 part of thixotropic agent in the batching tank according to the formula, and stir for 15 to 20 minutes. 1000 rpm, after stirring evenly, slow down the stirring speed, the stirring speed is 200 rpm, add 3 parts of coupling agent, 7 parts of titanium dioxide, 7 parts of mica powder, and 39.6 parts of glass powder in sequence, increase the stirring speed, and the rotation speed is 400~ Stir at 500 rpm for ...

Embodiment 2

[0046] (1) Preparation of component A: Open the lid of the directly purchased HDI trimer (imported) in 200L packaging, visually observe whether it is clear, whether there are flocculation products, stir, and check whether there are hard sediments at the bottom, such as If the above phenomenon occurs, mark it and place it uniformly for return or exchange. If there is no above phenomenon, subcontract according to the proportion. Get A component;

[0047] (2) Preparation of component B: Add 46 parts of secondary amino polymer, 0.4 part of dispersant, 0.4 part of defoamer, and 0.9 part of thixotropic agent in the batching tank according to the formula, and stir for 15 to 20 minutes. 1000 rpm, after stirring evenly, slow down the stirring speed, the stirring speed is 200 rpm, add 5 parts of coupling agent, 9 parts of titanium dioxide, 9.8 parts of mica powder, 28.5 parts of glass powder in turn, increase the stirring speed, and the speed is 400~ Stir at 500 rpm for 35-40 minutes, ...

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Abstract

The invention discloses solvent-free polyurea weather-resistant anticorrosion coating. The solvent-free polyurea weather-resistant anticorrosion coating comprises components A and component B. The components A are hexamethylene diisocyanate curing agents with the solid contents of 100% by weight; the components B comprise, by weight, 40-50 parts of parahelium polymers, 0.3-0.5 part of dispersing agents, 0.3-0.5 part of defoaming agents, 0.8-1 part of thixotropic agents, 3-5 parts of coupling agents, 7-10 parts of titanium dioxide, 7-10 parts of sericite and 23-42 parts of glass powder; a weight ratio of the components A to the components B is 27:100-34:100. The solvent-free polyurea weather-resistant anticorrosion coating has the advantages that the solvent-free polyurea weather-resistantanticorrosion coating can be used for the outer walls of above-ground steel storage tanks and the outer surfaces of non-heat-insulation steel overhead pipelines; the solvent-free polyurea weather-resistant anticorrosion coating is good in low-temperature flexibility and is ultrahigh in bond force with the surfaces of coated objects; the solvent-free polyurea weather-resistant anticorrosion coatingis sufficient in abrasion-resistant hardness and ultrahigh in ultraviolet aging resistance and salt spray resistance; the solid content of the solvent-free polyurea weather-resistant anticorrosion coating can reach 98% at least, and the solvent-free polyurea weather-resistant anticorrosion coating is wide in curing reactive environmental temperature interval; curing reaction can be quickly carried out without curing agents or accelerators; the solvent-free polyurea weather-resistant anticorrosion coating is free of sagging when thickly coated.

Description

technical field [0001] The invention relates to the technical field of anticorrosion of oil and gas pipelines, in particular to a solvent-free polyurea weather-resistant anticorrosion coating and a preparation method thereof. Background technique [0002] In order to slow down the corrosion of the metal matrix of the above-ground steel storage tanks and non-insulated steel overhead pipelines in the increasingly serious atmospheric environment, and prevent the occurrence of leakage accidents caused by corrosion, anti-corrosion coatings with excellent anti-corrosion performance and good workability have become the most important means of protection. The anti-corrosion coating structure generally used on the outer wall of domestic and foreign steel storage tanks and the outer surface of non-insulated steel overhead pipes is epoxy primer + epoxy cloud iron intermediate paint + weather-resistant anti-corrosion topcoat composite structure, and the weather-resistant anti-corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D5/08C09D7/61
CPCC08K2003/2241C09D5/08C09D7/61C09D175/02C08K3/22C08K3/34C08K3/40
Inventor 窦宏强董彬崔超杨宁刘墨
Owner BC P INC CHINA NAT PETROLEUM CORP
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