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A kind of preparation method and application of low viscosity polyether type hyperbranched epoxy resin

An epoxy resin and polyether-based technology, applied in the field of coatings, can solve the problems of high viscosity of hyperbranched polyether and does not conform to the development trend of low-VOC environmental protection coatings, etc., to achieve reduced diffusion rate, controllable molecular structure, and less side reactions Effect

Active Publication Date: 2021-12-07
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the polyether type hyperbranched epoxy resin is considered to have more excellent medium resistance, and the patent (CN201610345144.X) reports a 2 Monomer, polyfunctional glycidyl ether as B 3 Polyether type hyperbranched polymers are synthesized from monomers and used to prepare epoxy resin composite coatings, but the temperature required for the synthesis of hyperbranched polyethers in this invention is relatively high (80-150 ° C), and the viscosity of the synthesized hyperbranched polyethers Large, the prepared epoxy composite coating still needs to be mixed with a large amount of solvents, which does not meet the development trend of low VOC environmental protection coatings

Method used

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  • A kind of preparation method and application of low viscosity polyether type hyperbranched epoxy resin
  • A kind of preparation method and application of low viscosity polyether type hyperbranched epoxy resin
  • A kind of preparation method and application of low viscosity polyether type hyperbranched epoxy resin

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Embodiment 1

[0033] Embodiment 1: A kind of preparation method of polyether type hyperbranched epoxy resin

[0034] Dissolve 1.541g of 3,5-dihydroxybenzoic acid, 1.683g of octyl glycidyl ether and 0.161g of tetrabutylammonium bromide in 4mL of DMF, and react at 60°C for 5 hours under the protection of nitrogen. After the reaction, DMF was concentrated, the product was diluted with ethyl acetate, and the product was washed with NaHCO 3 solution was washed three times, then washed three times with saturated NaCl solution, and finally washed with water, anhydrous NaSO 4 Dried and spin-dried to obtain a light yellow liquid as A 2-1 monomer. Example 1 can use 9.071g of trimethylolpropane triglycidyl ether as B without purification 3 Monomer and 0.483g of tetrabutylammonium bromide, 40mL of DMF, add the reaction completed A at one time 2 In the monomer, the reaction was continued at 70° C. for 2 hours under the protection of nitrogen atmosphere. After the reaction is completed, precipitate ...

Embodiment 2

[0036] Example 2: In this example, on the basis of Example 1, the reaction time with trimethylolpropane triglycidyl ether is extended from 2 hours to 4 hours, and other conditions are as shown in Example 1. The obtained polyether The physical and chemical properties of type hyperbranched epoxy resin are shown in Table 1.

Embodiment 3

[0037] Example 3: In this example, on the basis of Example 1, the reaction time with trimethylolpropane triglycidyl ether is extended to 6 hours, and other conditions are as shown in Example 1, and the obtained polyether type hyperbranched The physical and chemical properties of epoxy resin are listed in Table 1.

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Abstract

The invention discloses a preparation method and application of a low-viscosity polyether type hyperbranched epoxy resin, belonging to the technical field of coatings. The preparation method uses dihydroxybenzoic acid and monofunctional glycidyl ether as raw materials to first synthesize diphenol intermediates with different side group structures, and then further polymerize with polyfunctional glycidyl ether to synthesize polyphenols with terminal epoxy groups. , Polyether type hyperbranched epoxy resin with polyether skeleton. The polyether type hyperbranched epoxy resin prepared by the invention has low-viscosity properties and can be used to modify the bisphenol A linear epoxy resin as a film-former of high-solid epoxy coatings. The solid content of the epoxy paint prepared by the invention is as high as over 90%, and the cured paint film has excellent toughness and medium resistance.

Description

technical field [0001] The invention relates to a preparation method and application of a low-viscosity polyether type hyperbranched epoxy resin, belonging to the technical field of coatings. Background technique [0002] Epoxy coatings have excellent substrate adhesion, low shrinkage and chemical resistance, and are widely used in the field of corrosion protection. In recent years, low-VOC epoxy coatings have become the focus of development, and high-solid epoxy coatings in low-VOC epoxy coatings have inherited the excellent corrosion resistance of solvent-based epoxy coatings, but their shortcomings are also obvious. The solvent content in the formula The decrease will lead to a great increase in the viscosity of the system, which will affect the film-forming performance of the coating. Low-molecular-weight liquid epoxy resins with low viscosity are commonly used as film-forming resins in high-solid coatings. However, liquid epoxy resins have high epoxy values ​​and many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/02C08G65/28C09D5/08C09D163/00C09D171/00
CPCC08G59/02C08G65/2615C08G2150/90C08L2205/025C09D5/08C09D163/00C08L63/00C08L71/00
Inventor 李小杰杨苏刘仁魏玮罗静朱叶刘晓亚
Owner JIANGNAN UNIV
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