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Mannich base curing agent for epoxy floor seal primer and preparation method thereof

A technology for sealing primers and epoxy floors, which is applied in the direction of epoxy resin coatings, coatings, anti-corrosion coatings, etc., and can solve problems such as large steric hindrance, low reactivity, and weak alkalinity of aromatic amines

Active Publication Date: 2020-10-02
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aromatic amines have weak alkalinity and large steric hindrance, and have low reactivity with epoxy resins. Curing reaction accelerators need to be added, and the heat resistance, oil resistance, acid resistance, water resistance, mechanical properties and electrical properties of the cured product are relatively high It is widely used in epoxy floors in pharmaceutical factories, power plants, etc., but the toxicity of aromatic amines is relatively high, most of them are solids, and a large amount of organic solvents need to be added, and the adhesion of the paint film is poor

Method used

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  • Mannich base curing agent for epoxy floor seal primer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Add 470g of phenol and 23.5g of sodium hydroxide into a 2L high-pressure stainless steel reactor, replace the air with nitrogen for 3 times, start stirring and slowly raise the temperature to 150°C, and slowly inject 220g of ethylene oxide into the kettle. The pressure is maintained at 0.4MPa. When the pressure in the reactor no longer drops, stop heating, and the addition reaction is over. After continuing to keep warm at this temperature for 1 hour, pass in cooling water to cool down to 60°C, and then add 10% NaOH aqueous solution Wash with saturated saline and stand to separate layers for 3 times, take the supernatant and dry it with anhydrous sodium sulfate to obtain phenol and propylene oxide adduct for use.

[0021] The second step: add 138g of phenol and ethylene oxide adduct, 210g of 4,4,-diaminodicyclohexylmethane into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, mix well, and slowly drop Add 72g of butyraldehyde, ...

Embodiment 2

[0023] Step 1: Add 540g of cresol and 27g of sodium hydroxide into a 2L high-pressure stainless steel reaction kettle, replace the air with nitrogen for 3 times, start stirring and slowly raise the temperature to 160°C, slowly introduce 265g of acrylonitrile, and maintain the pressure in the kettle At 0.5MPa, stop heating when the pressure in the reactor no longer drops, and the addition reaction is over. After continuing to keep warm at this temperature for 2 hours, pass in cooling water to cool down to 50°C, add 10% NaOH aqueous solution and saturated Wash with salt water and stand to separate for 3 times. The supernatant was taken and dried with anhydrous sodium sulfate to obtain the adduct of phenol and propylene oxide for use.

[0024] Step 2: Add 161g of cresol, acrylonitrile adduct, and 142g of 1,3-cyclohexanedimethylamine into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, mix well, and then slowly add butyraldehyde dropwise 72g, th...

Embodiment 3

[0026] Step 1: Add 750g of p-tert-butylphenol and 37.7g of potassium hydroxide into a 2L high-pressure stainless steel reactor, replace the air with nitrogen for 3 times, start stirring and slowly raise the temperature to 155°C, and slowly introduce ethylene oxide 220g, the pressure in the kettle was maintained at 0.45MPa, and when the pressure in the reactor no longer dropped, the heating was stopped, and the addition reaction was completed. After continuing to keep warm at this temperature for 1.5h, after passing through cooling water to cool to 55°C, add 10 % NaOH aqueous solution and saturated saline, and standing for three times for stratification, the upper layer was taken and dried with anhydrous sodium sulfate to obtain phenol and propylene oxide adducts for use.

[0027] The second step: add p-tert-butylphenol, 194g of ethylene oxide adduct, and 103g of diethylenetriamine into a three-necked flask equipped with a stirrer, a thermometer and a reflux condenser, mix and s...

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Abstract

The invention relates to a Mannich base curing agent for an epoxy floor seal primer and a preparation method thereof. The method comprises the following steps: putting phenol and a catalyst into a high-pressure reaction kettle; slowly introducing a metered addition reactant while stirring at 150-160 DEG C, maintaining the pressure in the kettle at 0.4-0.5 MPa, keeping the temperature for 1-2 hours, cooling, adding alkali liquor and saturated edible salt water, washing, standing for layering for multiple times, taking supernatant, and drying with anhydrous sodium sulfate to obtain a phenol addition product; and carrying out Mannich condensation on the phenol adduct, polyamine and aldehyde to synthesize the Mannich base curing agent with low viscosity. Compared with an existing phenolic aldehyde amine curing agent, the Mannich base curing agent does not contain free phenol, does not need a large amount of solvent, and is more environmentally friendly; the Mannich base curing agent is good in compatibility with epoxy resin, mild in curing reaction, convenient to construct and short in curing period; and a cured product has excellent adhesive force, corrosion resistance and mechanicalproperties.

Description

technical field [0001] The invention belongs to the field of thermosetting resin materials, and in particular relates to a Mannich base curing agent for epoxy floor sealing primer and a preparation method thereof. Background technique [0002] Epoxy resin is a kind of linear polymer material containing epoxy groups. It is affected by temperature and its viscosity range changes greatly. It has thermoplastic properties and cannot be used alone. It can only be formed by adding an appropriate amount of curing agent to chemically react with it. Polymer materials with a three-dimensional network structure are widely used in various industries because of their excellent adhesive properties, mechanical properties, electrical insulation, and thermal stability. At present, glycidyl ether type epoxy resin is mainly used in the epoxy floor industry, and there are relatively many types of curing agents, mainly polyamide, phenalkamine and aromatic amine curing agents. Epoxy floor seali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/62C09D163/00C09D5/08
CPCC08G59/623C09D5/08C09D163/00
Inventor 杨小华李守海李梅张燕诸进华陈瑶夏建陵
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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