Curing agent for high-solid water-based coating

A water-based, curing agent technology, applied in the field of coating materials, can solve the problems of poor weather resistance and variability, and achieve the effects of good anti-sag performance, convenient construction, and convenient cleaning

Inactive Publication Date: 2020-02-21
上海瀚岱化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many defects in the modified amine curing agent, such as poor weather resistance, changeability, etc.

Method used

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  • Curing agent for high-solid water-based coating
  • Curing agent for high-solid water-based coating
  • Curing agent for high-solid water-based coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of embodiment 1 formula a compound

[0030] Weigh 11.30 g of methyl 2-amino-5-nitrobenzoate into a reaction flask, add 60 mL of tetrahydrofuran and 30 mL of triethylamine to dissolve, then add 10 mL of tetrahydrofuran in which 12.05 g of vinyl dimethyl chlorosilane is dissolved dropwise at room temperature Solution, dropwise, stirred overnight at 45°C, after the reaction, cooled to room temperature, added 80 mL of water, extracted with dichloromethane (3*50 mL), combined the dichloromethane layers, dried over anhydrous sodium sulfate, filtered, evaporated the solvent under reduced pressure That is, it was directly used in the next step without purification.

[0031] ES: M / Z 281[M+H] + .

Embodiment 2

[0032] Embodiment 2: the preparation of formula b compound

[0033] Weigh 5g of DOPO into the reaction flask, add 7.2g of the compound of formula a obtained in Example 1, 80ml of dioxane, and reflux for 10h under nitrogen protection. After the reaction, cool to room temperature, evaporate the solvent under reduced pressure, and perform column chromatography The compound of formula b is obtained by purification.

[0034] ES: M / Z 497[M+H] + .

[0035] 1 H NMR (600MHz, CDCl 3 )(δ,ppm):8.36~8.34(m,1H),8.24~8.22(m,1H),7.98~7.96(m,1H),7.80~7.79(m,1H),7.67~7.65(m,1H ),7.55~7.53(m,1H),7.42~7.40(m,1H),7.25~7.24(m,1H),7.09~7.07(m,1H),7.01~7.00(m,2H),4.05(s ,1H), 3.90(s,3H), 1.85~1.83(m,2H), 1.05~1.04(m,2H), 0.09(s,6H).

Embodiment 3

[0036] Embodiment 3: the preparation of formula c compound

[0037] Weigh 4.2g of the compound of formula b obtained in Example 2 into a reaction flask, add 20mL of 40% aqueous sodium hydroxide solution, stir at 70°C for 2h, after the reaction is completed, cool to room temperature, adjust the pH to about 7 with 1M hydrochloric acid, Dichloromethane was added for extraction (3*20 mL), several layers were combined, dried over anhydrous sodium sulfate, filtered, the solvent was evaporated under reduced pressure, and the residue was recrystallized from methanol to obtain the compound of formula c.

[0038] ES: M / Z 483[M+H] + .

[0039] 1 H NMR (600MHz, CDCl 3 )(δ,ppm):11.88(br,1H),8.59~8.57(m,1H),8.38~8.37(m,1H),7.97~7.96(m,1H),7.83~7.81(m,1H), 7.66~7.65(m,1H),7.55~7.53(m,1H),7.42~7.40(m,1H),7.25~7.24(m,1H),7.09~7.07(m,1H),7.01~7.00(m ,2H), 4.05(s,1H), 1.88~1.86(m,2H), 1.10~1.09(m,2H), 0.09(s,6H).

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PUM

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Abstract

The invention provides a curing agent for a high-solid water-based coating. The curing agent comprises, by weight, 1 part of a compound represented by formula (I), 2-3 parts of trimethylolpropane triglycidyl ether, 2-3 parts of dimethylethanolamine and 1-2 parts of chitosan. The curing agent allows the water-based epoxy coating with ultralow VOC and high solid content to be obtained, and the coating has the advantages of simple formula and low cost, no addition of a wetting agent or a dispersing agent, direct dilution of an epoxy emulsion with water, excellent salt spray performance, easinessin being thickened, good anti-sagging performance, adjustment of the drying speed according to the construction environment, low VOC, convenience in construction, avoiding of gun blocking and pipelineblocking, and convenience in cleaning.

Description

technical field [0001] The invention relates to the field of coating materials, in particular to a curing agent for high-solid aqueous coatings, a preparation method and application thereof. Background technique [0002] With the successive promulgation of national environmental protection policies and increasingly stringent legal supervision, coating companies have invested a lot of manpower and material resources to develop environmentally friendly low-VOC coatings including epoxy coatings. [0003] There are many technical routes for environmentally friendly epoxy coatings, such as water-based epoxy coatings, solvent-based high-solid coatings, solvent-free, powder, and so on. These different types of coatings have their own unique properties and characteristics, which can meet the application requirements of different occasions. Among them, technical routes such as solvent-free and powder coatings can almost achieve zero VOC. Although they require high environmental cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C08G59/64C09D163/00
CPCC08G59/623C08G59/64C09D163/00
Inventor 沈岳吕宏飞沈君岱伍宽平
Owner 上海瀚岱化学有限公司
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