Ultra-low-VOC high-solid-content waterborne epoxy coating and preparation method and application thereof

An epoxy coating, water-based technology, applied in the field of coating materials, can solve the problems of long manufacturing cycle, long cycle, cumbersome process, etc., and achieve the effect of reducing VOC emissions and good protection

Inactive Publication Date: 2019-11-01
山东奔腾漆业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is cumbersome, the manufacturing cycle is long, and the energy consumption is high. During the manufacturing process, VOC-containing additives need to be added, and additional water is required, resulting in low solid content of the product. During coating construction, multiple coatings are required to achieve the desired effect. The consumption is high and the cycle is long. The water-based paint produced by this process can only replace oil-based products with a VOC greater than 420g / L, and cannot replace other oil-based products containing VOC (VOC less than 420g / L)

Method used

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  • Ultra-low-VOC high-solid-content waterborne epoxy coating and preparation method and application thereof
  • Ultra-low-VOC high-solid-content waterborne epoxy coating and preparation method and application thereof
  • Ultra-low-VOC high-solid-content waterborne epoxy coating and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] The preparation of embodiment 1 waterborne epoxy resin

[0026] The compound shown in formula I and epichlorohydrin are stirred and heated, and when the temperature rises to 60-70°C, sodium hydroxide aqueous solution is added dropwise, and the dropwise addition is completed within 2 hours at 70-80°C; Keep at 90-100°C for 1-2 hours to obtain a viscous resin; add distilled water and toluene to the viscous resin, stir to dissolve the resin, remove the water layer by static layering, and evaporate the toluene layer to dryness under reduced pressure to obtain; The molar ratio of the compound to epichlorohydrin is n: (2n+2 to 2n+4); the content of sodium hydroxide in the aqueous sodium hydroxide solution is 0.5n-1.5n moles; the volume ratio of distilled water and toluene is 1:2 .

[0027] 408g of the reaction product was obtained, m / z=422.2, see figure 1 .

Embodiment 2

[0028] The preparation of embodiment 2 waterborne epoxy resins

[0029] The compound shown in formula I and epichlorohydrin are stirred and heated, and when the temperature rises to 60-70°C, sodium hydroxide aqueous solution is added dropwise, and the dropwise addition is completed within 2 hours at 70-80°C; Keep at 90-100°C for 1-2 hours to obtain a viscous resin; add distilled water and toluene to the viscous resin, stir to dissolve the resin, remove the water layer by static layering, and evaporate the toluene layer to dryness under reduced pressure to obtain; The molar ratio of the compound to epichlorohydrin is n: (2n+2 to 2n+4); the content of sodium hydroxide in the aqueous sodium hydroxide solution is 0.5n-1.5n moles; the volume ratio of distilled water and toluene is 1:2 .

[0030] 395g of the reaction product was obtained, m / z=422.2, see figure 1 .

Embodiment 3

[0031] The preparation of embodiment 3 waterborne epoxy resins

[0032] The compound shown in formula I and epichlorohydrin are stirred and heated, and when the temperature rises to 60-70°C, sodium hydroxide aqueous solution is added dropwise, and the dropwise addition is completed within 2 hours at 70-80°C; Keep at 90-100°C for 1-2 hours to obtain a viscous resin; add distilled water and toluene to the viscous resin, stir to dissolve the resin, remove the water layer by static layering, and evaporate the toluene layer to dryness under reduced pressure to obtain; The molar ratio of the compound to epichlorohydrin is n: (2n+2 to 2n+4); the content of sodium hydroxide in the aqueous sodium hydroxide solution is 0.5n-1.5n moles; the volume ratio of distilled water and toluene is 1:2 .

[0033] 392g of the reaction product was obtained, m / z=422.2, see figure 1 .

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Abstract

Ultra-low-VOC high-solid-content waterborne epoxy coating is provided. The coating includes, by weight, 20-30 parts of waterborne epoxy resin, 20-30 parts of a curing agent, 1-3 parts of a surfactant,1-5 parts of a buffer agent, 1-10 parts of a pigment filler, 1-3 parts of a defoamer and 1-3 parts of a flow promoter. Through research of different types of waterborne epoxy resin and curing agents,the coating is prepared, a technique enabling a high solid content and low viscosity of the waterborne coating is achieved, a technical problem that high-solid-content solvent based coating cannot bemade aqueous is solved, and VOC emission is further reduced, meeting national environmental protection policies. The coating can provide good protection for industries that need heavy corrosion prevention, such as harbor machinery, ships and offshore platforms.

Description

technical field [0001] The invention relates to the field of coating materials, in particular to an ultra-low VOC high-solid aqueous epoxy coating and a preparation method and application thereof. Background technique [0002] Due to the high viscosity of water-based resin raw materials and the high-speed dispersion that easily lead to resin demulsification, water-based epoxy coatings are currently widely used in the manufacturing process of water-based slurry. The process is cumbersome, the manufacturing cycle is long, and the energy consumption is high. During the manufacturing process, VOC-containing additives need to be added, and additional water is required, resulting in low solid content of the product. During coating construction, multiple coatings are required to achieve the desired effect. The consumption is high and the cycle is long. The water-based paint produced by this process can only replace oil-based products with a VOC greater than 420g / L, and cannot repla...

Claims

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Application Information

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IPC IPC(8): C09D163/00C08G59/40
CPCC08G59/40C09D163/00
Inventor 沈岳时迎娜
Owner 山东奔腾漆业股份有限公司
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