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A kind of curing agent for solid phenolic epoxy resin powder and one-step preparation method thereof

A phenolic epoxy resin and epoxy resin technology, which is applied in the field of special additives for polymer materials, can solve the problems that affect the water resistance and corrosion resistance of the cured product, the molecular weight distribution of the product is easy to become wider, and it is not conducive to saving energy and production efficiency. and other problems, to achieve the effect of easy control of molecular weight, shortened process production steps, and good anti-corrosion performance

Active Publication Date: 2017-09-12
TIANJIN BOHAN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is also found that there are some shortcomings in the process of use: the epoxy resin cured by phenolic resin is brittle, especially at low temperature, which affects its actual use ability; if other toughening agents are added, it will definitely affect the water resistance of the cured product. Corrosion resistance
Its shortcoming is that the phenolic curing agent prepared by the two-step method is difficult to mix, which makes the molecular weight distribution of the product easy to become wider, especially the two-step method takes a relatively long time, which is not conducive to saving energy and improving production efficiency

Method used

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  • A kind of curing agent for solid phenolic epoxy resin powder and one-step preparation method thereof
  • A kind of curing agent for solid phenolic epoxy resin powder and one-step preparation method thereof
  • A kind of curing agent for solid phenolic epoxy resin powder and one-step preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 100g of epoxy resin E into a 250ml three-necked flask, raise the temperature to 150°C, then add 140g of bisphenol A and 0.1g of catalyst tetrabutylammonium bromide, react for 5 hours, discharge the material, and obtain a curing agent after cooling.

[0022] The softening point of the product tested in the experiment is 94°C, the hydroxyl value is 0.5407eq / 100g, the epoxy value is 0.00017eq / 100g, and the cathodic disbonding and water resistance tests all meet the requirements.

Embodiment 2

[0024] Add 100g of epoxy resin E to a 250ml three-necked bottle, raise the temperature to 170°C, then add 125g of bisphenol A and 0.25g of catalyst benzyltriphenylphosphine chloride, react for 2.5 hours, discharge the material, and obtain a curing agent after cooling .

[0025] The softening point of the product tested in the experiment is 103°C, the hydroxyl value is 0.5011eq / 100g, the epoxy value is 0.00013eq / 100g, and the cathodic disbonding and water resistance tests all meet the requirements.

Embodiment 3

[0027] Add 100g of epoxy resin E to a 250ml three-necked bottle, raise the temperature to 150°C, then add 90g of bisphenol A and 0.15g of catalyst benzyltriethylammonium chloride, react for 3 hours, discharge the material, and obtain a curing agent after cooling .

[0028] According to the experimental test, the softening point of the product is 115°C, the hydroxyl value is 0.4721eq / 100g, the epoxy value is 0.00011eq / 100g, and the cathodic disbonding and water resistance tests all meet the requirements.

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Abstract

The invention discloses a one-step preparation method of a curing agent for solid phenolic epoxy resin powder, which is carried out according to the following operations: add 100 parts of epoxy resin E into a three-necked bottle container, raise the temperature to 150-200°C, and then add 90-140 parts of bisphenol A and 0.1-5.0 parts of catalyst are reacted for 2-5 hours, discharged, and cooled to obtain a curing agent for solid phenolic epoxy resin powder, which has the characteristics of toughness and good anti-corrosion performance.

Description

technical field [0001] The invention relates to the technical field of special additives for polymer materials, in particular to a one-step preparation method for a curing agent for solid phenolic epoxy resin powder. Background technique [0002] Powdered epoxy resin is often used in pipelines and other harsh environments that require good anti-corrosion performance. The early curing agents were dicyandiamide, anhydride, hydrazide, etc., which have low chemical resistance and water resistance. In alkali and seawater solution, the coating is prone to peeling off and cracking, and the use effect is poor. The phenolic resin-containing curing agent introduced later, the cured epoxy resin has excellent water resistance, acid and alkali resistance and salt corrosion ability. Because the system contains a large number of benzene rings, the cured product also has very good heat resistance. However, it is also found that there are some shortcomings in the process of use: the epoxy r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/62
Inventor 胡君花
Owner TIANJIN BOHAN TECH DEV CO LTD
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