A kind of preparation method of polyurethane-epoxy resin block copolymerization waterborne resin

A technology of epoxy resin and block copolymerization, which is applied in coatings, electrophoretic coatings, etc., can solve the problems of incomplete ring opening, affecting the storage stability of emulsions, and difficult control of the reaction process, and achieves the effect of simple process

Active Publication Date: 2021-03-30
HUNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the ring-opening reaction process of epoxy resin is difficult to control and cannot be completely opened. Therefore, the obtained modified resin emulsion contains epoxy groups and small molecule ring-opening agents (such as acids, amines, etc.), Affect the storage stability of the emulsion

Method used

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  • A kind of preparation method of polyurethane-epoxy resin block copolymerization waterborne resin
  • A kind of preparation method of polyurethane-epoxy resin block copolymerization waterborne resin
  • A kind of preparation method of polyurethane-epoxy resin block copolymerization waterborne resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 (comparative example)

[0038] Taking formula parameters Rt=1.10, H%=30w% as an example, the preparation method of polyurethane-epoxy resin block copolymerized waterborne resin is as follows:

[0039](1) Put 25.39 g of polycaprolactone diol (molecular weight Mn=2000) and 5.64 g of isophorone diisocyanate (IPDI) into the reaction bottle, the reaction temperature is 80 ℃, and react for 2 hours to prepare Obtain polyurethane prepolymer 31.03g;

[0040] The ratio of the oligomer dibasic alcohol and diisocyanate makes the ratio of the amount of substance of the isocyanate group in the diisocyanate to the ratio of the amount of substance of [OH] in the oligomer dibasic alcohol be 2:1;

[0041] (2) Add 10.00 g of epoxy E-44, 3.30 g of piperazine and 40.21 g of N,N-dimethylformamide to the polyurethane prepolymer obtained in step (1), stir evenly, heat up to 55°C, and react for 5 h ; Reaction until the epoxy value is 0, the mixture is obtained;

[0042] (3) Add ...

Embodiment 2

[0045] Taking formula parameters Rt=1.20, H%=30w% as an example, the preparation method of polyurethane-epoxy resin block copolymerized waterborne resin is as follows:

[0046] (1) Put 30.05 g of polycaprolactone diol (molecular weight Mn=2000) and 6.69 g of isophorone diisocyanate (IPDI) into the reaction bottle, the reaction temperature is 80 ℃, and react for 2 hours to prepare Obtain polyurethane prepolymer 36.74g;

[0047] The ratio of the oligomer dibasic alcohol and diisocyanate makes the ratio of the amount of substance of the isocyanate group in the diisocyanate to the ratio of the amount of substance of [OH] in the oligomer dibasic alcohol be 2:1;

[0048] (2) Add 11.59 g of epoxy E-44, 4.16 g of piperazine and 41.98 g of N,N-dimethylformamide to the polyurethane prepolymer obtained in step (1), stir evenly, heat up to 55°C, and react for 5 h ; Reaction until the epoxy value is 0, the mixture is obtained;

[0049] (3) Add deionized water of the same quality as the a...

Embodiment 3

[0052] Taking formula parameters Rt=1.25, H%=30w% as an example, the preparation method of polyurethane-epoxy resin block copolymerized waterborne resin is as follows:

[0053] (1) Put 27.90 g of polycaprolactone diol (molecular weight Mn=2000) and 6.21 g of isophorone diisocyanate (IPDI) into the reaction bottle, the reaction temperature is 80 ℃, and react for 2 hours to prepare Obtain polyurethane prepolymer 34.11g;

[0054] The ratio of the oligomer dibasic alcohol and diisocyanate makes the ratio of the amount of substance of the isocyanate group in the diisocyanate to the ratio of the amount of substance of [OH] in the oligomer dibasic alcohol be 2:1;

[0055] (2) Add 10.63 g of epoxy E-44, 3.99 g of piperazine and 38.98 g of N,N-dimethylformamide to the polyurethane prepolymer obtained in step (1), stir evenly, heat up to 55°C, and react for 5 h ; Reaction until the epoxy value is 0, the mixture is obtained;

[0056] (3) Add deionized water of the same quality as the a...

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Abstract

The invention relates to a preparation method of polyurethane-epoxy resin block copolymerized aqueous resin. The preparation method comprises the following steps: (1) carrying out a reaction on an oligomer dihydric alcohol and diisocyanate to obtain a polyurethane prepolymer; (2) adding epoxy resin, piperazine and a water soluble solvent to react till the epoxy value is 0 to obtain a mixture; (3)adding deionized water equal to the water soluble solvent in mass, uniformly stirring the mixture, leaving the mixture to stand to precipitate a polymer, and washing the polymer to obtain precursor resin; and (4) heating the precursor resin, adding an organic acid, stirring the mixture, adding deionized water, and stirring the mixture for 20-35 minutes to obtain the resin. The polyurethane resin and the epoxy resin are block copolymerized, and limit of a synthetic method of a common polyurethane and epoxy material on introduction amount of epoxy resin is overcome; moreover, the performance ofa product can be adjusted by adjusting parameters of a formula.

Description

technical field [0001] The invention relates to the field of polyurethane-epoxy resin materials, in particular to a method for preparing a polyurethane-epoxy resin block copolymerized water-based resin, which is particularly suitable for cathodic electrophoretic coatings. Background technique [0002] There are many kinds of epoxy resins and their application fields are wide. However, the unmodified epoxy resin has high crosslinking density after curing, resulting in excessive internal stress, and the product has defects such as brittleness, easy cracking, and poor impact resistance, which limit its application field. Polyurethane has good flexibility, and its copolymerization modification with epoxy resin can achieve complementary advantages and obtain polyurethane epoxy materials with better performance. There are usually three methods for preparing polyurethane epoxy materials: mechanical blending method, direct graft copolymerization method and epoxy ring-opening method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00C09D5/44
CPCC08G81/00C09D5/443C09D5/4465
Inventor 邓剑如江维胜张旭东黄鹂李健刘娅莉刘美凤任艳群
Owner HUNAN UNIV
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