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Polyurethane modified epoxy resin diluent and low viscosity high toughness epoxy resin composition composed thereof

A polyurethane modification and epoxy resin technology, applied in the field of epoxy resin, can solve the problems of reducing the epoxy value of the product, large difference, difficult to control continuous addition side reactions, etc., and achieve good dilution effect and improved bending strain

Active Publication Date: 2019-03-26
NAVAL UNIV OF ENG PLA
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Problems solved by technology

[0002] The main component of 669 epoxy resin diluents that are common in the market is ethylene glycol diglycidyl ether, and its epoxy value is 0.6-0.7. If the epoxy value is calculated according to the structure of ethylene glycol diglycidyl ether, then It should be 1.14, and the difference between the two is large. The reason may be that ethylene glycol diglycidyl ether companies in the market adopt the mainstream acid-catalyzed two-step method in their production process, and the continuous addition in the first step reaction The side reactions are difficult to control, so that in addition to the formation of ethylene glycol diglycidyl ether in the second step of hydrolysis, there are a large number of other epoxy-terminated products containing polyhydroxyl groups on the main chain, as well as ethylene glycol that has not reacted stoichiometrically. And ethylene glycol glycidyl ether, etc., which reduce the epoxy value of the product

Method used

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  • Polyurethane modified epoxy resin diluent and low viscosity high toughness epoxy resin composition composed thereof
  • Polyurethane modified epoxy resin diluent and low viscosity high toughness epoxy resin composition composed thereof
  • Polyurethane modified epoxy resin diluent and low viscosity high toughness epoxy resin composition composed thereof

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[0030] For a better understanding of the present invention, the following examples are further descriptions of the present invention, but the content of the present invention is not limited to the following examples.

[0031] Preparation of polyurethane modified 669 diluent:

[0032] The hydroxyl value range of 669 measured by the acetic anhydride-sulfuric acid method is 0.06-0.10. The dehydrated 669 is placed in a three-necked flask, and the double-distilled MDI is placed in a constant pressure separatory funnel. According to n(NCO) : The ratio of n(OH)=1:1 is slowly added dropwise to the three-necked flask filled with 669, the stirring speed of the stirrer in the three-necked flask is 200rpm, and the N 2 protection, adjust the reaction temperature, and slowly increase the temperature of the reaction system from room temperature to 120° C., and keep the temperature for 4 hours to obtain the reaction product. figure 1 It is the reaction principle of polyurethane modified 669 ...

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Abstract

The invention relates to a polyurethane modified epoxy resin diluent and a low viscosity high toughness epoxy resin composition composed thereof. A preparation method of the polyurethane modified epoxy resin diluent comprises the following steps: determining hydroxyl value in the hydroxyl-containing epoxy resin diluent; in a nitrogen atmosphere, adding MDI into the epoxy resin diluent according toa stoichiometric ratio that isocyanic acid can be fully reacted with hydroxyl in the diluent, stirring the mixture, raising the temperature of the reaction system to 110-130 DEG C, and keeping the temperature for 4-6 hours to obtain the polyurethane modified epoxy resin diluent. The polyurethane modified epoxy resin diluent has a relatively good diluting effect to epoxy resin, and the elongationat break and the buckling strain of the cured epoxy resin composition are improved greatly. Meanwhile, the tensile strength, the bending strength and the bending modulus are reduced greatly correspondingly, and the toughness is enhanced obviously.

Description

technical field [0001] The invention relates to the technical field of epoxy resins, in particular to a polyurethane-modified epoxy resin diluent and a low-viscosity epoxy resin composition composed of the diluent. Background technique [0002] The main component of 669 epoxy resin diluents that are common in the market is ethylene glycol diglycidyl ether, and its epoxy value is 0.6-0.7. If the epoxy value is calculated according to the structure of ethylene glycol diglycidyl ether, then It should be 1.14, and the difference between the two is large. The reason may be that ethylene glycol diglycidyl ether companies in the market adopt the mainstream acid-catalyzed two-step method in their production process, and the continuous addition in the first step reaction The side reactions are difficult to control, so that in addition to the formation of ethylene glycol diglycidyl ether in the second step of hydrolysis, there are a large number of other epoxy-terminated products cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/58C08L63/00C08L75/04
CPCC08G18/58C08L63/00C08L75/04
Inventor 李瑜孙昭宜梅志远饶秋华
Owner NAVAL UNIV OF ENG PLA
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