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Castor oil sourced aqueous epoxy curing agent, and preparation method thereof

A water-based epoxy and castor oil technology, applied in the field of epoxy curing agents, can solve problems such as instability and film performance degradation, and achieve the effect of promoting the utilization of high added value, improving toughness and improving hydrophilicity

Inactive Publication Date: 2019-08-09
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ionic curing agent prepared by organic acid salt formation is more sensitive to acidity and alkalinity, and when used together with alkaline pigments and fillers, it is prone to instability; in addition, the organic acid added in the preparation process of this type of curing agent It will corrode metal products and cause the performance of coating film to decrease

Method used

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  • Castor oil sourced aqueous epoxy curing agent, and preparation method thereof
  • Castor oil sourced aqueous epoxy curing agent, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Step 1: Add liquefied MDI, ricinoleic acid, and 5‰ dilaurel in the four-necked flask in sequence according to the ratio of liquefied MDI: ricinoleic acid to 1:3 (mol:mol). dibutyltin acid, and react at a temperature of 85±2°C for 2 hours to obtain castor oil-derived dibasic acid (RA-DA).

[0019] The second step: dissolving RA-DA into an equal mass of 1,4-dioxane solvent to prepare a 1,4-dioxane solution with 50 wt.% of RA-DA. According to the acid value value of RA-DA, according to the ratio of carboxyl group: epoxy group of 1:2 (mol:mol), at 115 ° C, add ethylene glycol diglycidyl ether and the amount of ethylene glycol diglycidyl ether Add the 1,4-dioxane solution of RA-DA dropwise into a four-necked flask of cetyltrimethylammonium chloride with 0.3% glyceryl ether mass, and after the dropwise addition, keep it warm at 115°C for 3 hours. All solvents were distilled off under reduced pressure to obtain castor oil-derived epoxy active intermediate RAE.

[0020] The t...

Embodiment 2

[0023] Step 1: Add liquefied MDI, ricinoleic acid, and 5‰ dilaurel to the four-necked flask in sequence according to the ratio of liquefied MDI: ricinoleic acid to 1:4 (mol:mol). dibutyltin acid, and react at a temperature of 85±2°C for 2 hours to obtain castor oil-derived dibasic acid (RA-DA).

[0024] The second step: according to the acid value of RA-DA, according to the ratio of carboxyl: epoxy group of 1:2 (mol:mol), at 115 ° C, add ethylene glycol diglycidyl ether and the amount of ethyl In a four-necked flask of cetyltrimethylammonium chloride with a glycol diglycidyl ether mass of 0.35%, add RA-DA 50wt.% 1,4-dioxane solution dropwise. Heat the reaction at 115°C for another 3 hours, and distill off all the solvent under reduced pressure to obtain the castor oil-derived epoxy active intermediate RAE.

[0025] The third step: according to the epoxy value value of RAE, according to the ratio of epoxy group: diethylenetriamine is 1:2.1 (mol:mol), take RAE and make 50wt.% e...

Embodiment 3

[0027] The first step: according to the ratio of dicyclohexylmethane diisocyanate (HMDI): ricinoleic acid is 1:3 (mol:mol), add HMDI, ricinoleic acid and the total amount of HMDI and ricinoleic acid to the four-necked flask successively The quality is 5‰ dibutyltin dilaurate, and the temperature is controlled to 75±2°C for 3 hours to obtain the castor oil-derived dibasic acid (RA-DA).

[0028] The second step: according to the acid value value of RA-DA, according to the ratio of carboxyl group: epoxy group of 1:2 (mol:mol), at 115 ° C, add polyethylene glycol diglycidyl ether XY215 and the dosage In a four-necked flask containing 0.3% cetyltrimethylammonium chloride by weight of polyethylene glycol diglycidyl ether XY215, a 1,4-dioxane solution of 50 wt.% RA-DA was added dropwise, After the dropwise addition, keep the temperature at 115°C for another 3 hours, and distill off all the solvent under reduced pressure to obtain the castor oil-derived epoxy active intermediate RAE. ...

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Abstract

The invention discloses a castor oil sourced aqueous epoxy curing agent, and a preparation method thereof. The preparation method comprises following steps: diisocyanate, ricinoleic acid (RA), and dibutyltin dilaurate are mixed to be uniform, the temperature is controlled to be 60 to 85 DEG C, and reaction is carried out for 2 to 4h so as to obtain a ricinoleic acid sourced diacid (RA-DA); RA-DA is reacted with ethylene glycol diglycidylether (or polyethyleneglycol diglycidylether) so as to obtain a ricinoleic acid sourced epoxy active intermediate RAE; and RAE is subjected to polyamine chainextansion and single epoxy end-capping agent end capping so as to obtain the ricinoleic acid based aqueous epoxy curing agent (RAWCA). RAWCA can be prepared into an aqueous solution with a solid content of 40 to 60% for using. According to the preparation method, natural renewable castor oil derivative is taken as a raw material to prepare the aqueous epoxy curing agent product, so that it is helpful in promotion of green renewable forest and grass resource high added value utilization, and satisfying of green environment protection and sustainable development requirements.

Description

technical field [0001] The invention belongs to the field of epoxy curing agents, and in particular relates to a castor oil-sourced water-based epoxy curing agent and a preparation method thereof. Background technique [0002] Epoxy resin is a kind of thermosetting material widely used in national production and life. However, epoxy resin itself is a kind of thermoplastic resin material. Since its molecular structure is linearly distributed, the solid resin will soften and melt after heating, and the viscosity of liquid resin will decrease when heated. Therefore, in practical applications, Pure epoxy resin has no great practical value. Only after adding curing agent and other modified components to form a high polymer material with a three-dimensional network structure can a series of excellent physical and mechanical properties be obtained. [0003] With the increasingly urgent and strict requirements for environmental protection, water-based epoxy systems that do not cont...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G65/26C08G65/333
CPCC08G59/504C08G65/2615C08G65/33306
Inventor 李梅杨小华夏建陵李守海丁海阳许利娜张燕
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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