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Solvent-free polyaspartate polyurea paint, and preparation method and application thereof
Active Publication Date: 2016-06-15
CYG CHANGTONG NEW MATERIAL
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Problems solved by technology
However, epoxy FRP products commonly used in the market have the defects of slow curing at low temperature and weak adhesion with the original pipeline anti-corrosion layer (3PE). These two key defects have seriously affected the current application of epoxy FRP in the field of oil and gas pipelines. usage of
[0003] The chemical reaction mechanism of the two-component epoxy resin coating is that the terminal epoxy group on the molecular chain of the epoxy resin undergoes a legal cross-linking reaction with the amino group of the amine curing agent, and the curing reaction occurs when the ambient temperature is low (generally below 5°C). The speed is very slow, which seriously affects the construction efficiency during the crossing construction of oil and gas pipelines in winter and in cold northern climates, and even tends to be unusable
In addition, the molecular chain of epoxy resin has a polar structure, while the polyethylene of the main anti-corrosion layer of the pipeline (3PE structure) has a non-polar long-chain structure. (3PE structure) the bonding force is not strong, affecting the protective effect
Method used
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Embodiment 1
[0030] A solvent-free polyaspartic ester polyurea paint, comprising A component and B component, the components contained in the A component and their weight percentages are: 80% of HDI, 20% of modified HDI trimer. The modified HDI trimer is a polyisocyanate using isocyanate-modified methylene diisocyanate as a raw material;
[0031] The components contained in the B component and their weight percentages are: polyaspartic acid ester 70%, titanium dioxide 15%, modified silica powder 10%, defoamer 1%, leveling agent 1%, adhesion promoter 2%, coupling agent 1%.
[0032] The polyaspartic acid ester is prepared by the following steps: First, the raw materials are weighed according to the mass ratio of hexamethylenediamine (HAD) and isophoronediamine (IPDA) as 1:0.75, and the hexamethylenediamine (HAD) 1. Add isophoronediamine (IPDA) into a four-necked flask with a stirrer and a thermometer, start stirring and feed nitrogen, slowly add diethyl maleate dropwise, and keep the temper...
Embodiment 2
[0039]A solvent-free polyaspartic ester polyurea coating, including A component and B component, the components contained in the A component and their weight percentages are: HDI60%, modified HDI trimer 40%; wherein The grade of the modified HDI trimer is N3390 from Huntsman.
[0040] The components contained in the B component and their weight percentages are: polyaspartic acid ester 70%, titanium dioxide 5%, modified silica powder 15%, defoamer 2%, leveling agent 2%, adhesion promoter 3%, coupling agent 3%.
[0041] The polyaspartic acid ester is prepared by the following steps: First, the raw materials are weighed according to the mass ratio of hexamethylenediamine (HAD) and isophoronediamine (IPDA) as 1:2.5, and the hexamethylenediamine (HAD) 1. Add isophoronediamine (IPDA) into a four-necked flask with a stirrer and a thermometer, start stirring and feed nitrogen, slowly add dimethyl maleate dropwise, and keep the temperature at 40°C. The amount of dimethyl maleate is a...
Embodiment 3
[0048] A solvent-free polyaspartic ester polyurea coating, comprising A component and B component, the components contained in the A component and their weight percentages are: HDI50%, modified HDI trimer 50%; wherein The grade of the modified HDI trimer is N3390 from Huntsman.
[0049] The components contained in the B component and their weight percentages are: polyaspartic acid ester 60%, titanium dioxide 8%, modified silica powder 20%, defoamer 3%, leveling agent 3%, adhesion promoter 4%, coupling agent 2%.
[0050] The polyaspartic acid ester is prepared by the following steps: First, the raw materials are weighed according to the mass ratio of hexamethylenediamine (HAD) and isophoronediamine (IPDA) as 1:1, and the hexamethylenediamine (HAD) 1. Add isophoronediamine (IPDA) into a four-necked flask with a stirrer and a thermometer, start stirring and feed nitrogen, slowly add dibutyl maleate dropwise, and keep the temperature at 40°C. The amount of dibutyl maleate is add...
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Abstract
The invention provides a solvent-free polyaspartate polyurea paint, and a preparation method and application thereof. The solvent-free polyaspartate polyurea paint comprises a component A and a component B. The component A comprises the following ingredients in percentage by weight: 60-80% of hexamethylene diisocyanate and 20-40% of urethano modified HDI (hexamethylene diisocyanate) tripolymer. The component B comprises the following ingredients in percentage by weight: 60-70% of polyaspartate, 5-10% of pigment and filler, 10-20% of modified silicon micropowder, 1-3% of defoaming agent, 1-3% of leveling agent, 2-5% of adhesion promoter and 1-3% of coupling agent. The mass ratio of the component A to the component B is (3-5):1. The technical scheme provided by the invention greatly improves the low-temperature curing performance of the product and enhances the binding strength with the nonpolar material polyethylene; and the solvent-free polyaspartate polyurea paint has the advantages of high flexibility, high mechanical strength and high chemical corrosion resistance.
Description
technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a solvent-free polyaspartate polyurea coating and a preparation method and application thereof. Background technique [0002] During the directional drilling of oil and gas pipelines to cross rivers, mountains, and railways, the pipeline anti-corrosion layer (3PE structure) needs to be protected, otherwise the original anti-corrosion layer will be greatly damaged. At present, what generally choose on the market is a kind of wear-resistant epoxyglass fiber reinforced plastic product to carry out external protection to 3PE (Polyethylene, polyethylene) anticorrosion layer, and described epoxyglass fiber reinforced plastic product is the composite structure of epoxyresin coating and glass fiber cloth. However, epoxy FRP products commonly used in the market have the defects of slow curing at low temperature and weak adhesion with the original pipeline anti-cor...
Claims
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Application Information
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