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Nonionic self-emulsifying waterborne epoxy curing agent and preparation method thereof

A water-based epoxy, self-emulsifying technology, applied in the direction of epoxy resin coatings, coatings, etc., can solve the problem that the acid resistance, wear resistance and hardness of the paint film cannot meet the needs of the market, and the investment in research and development of new curing agents Hysteresis, general product performance and other problems, to achieve the effect of excellent heat resistance, improved heat resistance, excellent flexibility

Active Publication Date: 2016-02-10
GUANGZHOU SUPER CHEM COATING CO LTDGUANGZHOU SUPER CHEM COATING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Following Shell, foreign companies such as Airproduct, Huntsman, and Momentive have also successively developed Class III water-based epoxy curing agents. Compared with solvent-based epoxy curing agents, their prices are very expensive, and their performance also has certain limitations. gap; compared with foreign countries, domestic investment in research and development of new curing agents is relatively lagging behind. In recent years, companies such as Shanghai Hanzhong, Zhejiang Anbang New Materials, and Baichen Chemical have also developed their own Class III water-based epoxy curing agents. However, the performance of the product is average and the effect is not good, especially the paint film can not meet the market demand in terms of acid resistance, wear resistance and hardness, and the price is relatively expensive

Method used

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  • Nonionic self-emulsifying waterborne epoxy curing agent and preparation method thereof
  • Nonionic self-emulsifying waterborne epoxy curing agent and preparation method thereof
  • Nonionic self-emulsifying waterborne epoxy curing agent and preparation method thereof

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preparation example Construction

[0055] Corresponding to the above formula system, the preparation method of this kind of nonionic self-emulsifying water-based epoxy curing agent comprises the following steps:

[0056] 1) Add epoxy-terminated polyether to the basic amine, and extend the chain of the basic amine. After the reaction is complete, add a monoepoxy compound to partially block the primary amine groups in the system to obtain prepolymer A;

[0057] 2) Adding monoepoxides to polyether amines, partially capping the primary amino groups in the system, to obtain prepolymer B;

[0058] 3) Mix prepolymers A and B, add epoxy resin, and after the reaction is complete, add monoepoxide and silane coupling agent to end-block the remaining primary amino groups in the system;

[0059] 4) Constant temperature, adding water to disperse to obtain nonionic self-emulsifying water-based epoxy curing agent.

[0060] Preferably, corresponding to the above-mentioned formula system, the preparation method of this kind of ...

preparation example 1

[0084]1) Add 90.00g of tetraethylenepentamine to a four-necked round-bottom flask equipped with a thermometer, condenser, dropping funnel and stirrer, raise the temperature to 60°C, and slowly add 45.00g of ethylene glycol dropwise after the temperature is constant Diglycidyl ether XY669 (Guangzhou Cool Special Chemical Co., Ltd.) carries out chain extension and reacts for 3 hours; after the reaction is completed, 31.64 g of butyl glycidyl ether is added thereto to cap the primary amino groups in the system, and reacted for 3 hours to obtain a prepolymer Object A;

[0085] 2) Add 121.50g polyetheramine T403 (M w =440, Huntsman Chemical Trading Ltd.), keeping the temperature of the system at 60°C, slowly adding 65.10g of butyl glycidyl ether to partially cap it, and reacting for 4h to obtain prepolymer B;

[0086] 3) Mix the above prepolymers A and B uniformly at 50°C, then add 78.43g of epoxy resin E-51 to it for epoxy-amine addition, react for 5h, and then add 6.51g of butyl...

preparation example 2

[0093] 1) Add 270.00g polyethyleneimine (M w =600, Chengdu Best Reagent Co., Ltd.), heat up to 80°C, and slowly add 116.82g of polyethylene glycol diglycidyl ether XY215 (epoxy value=0.34, Anhui Hengyuan Chemical Co., Ltd.) Carry out chain extension and react for 4 hours; after the reaction is completed, add 32.55 g of butyl glycidyl ether to cap the primary amino groups in the system, and react for 4 hours to obtain prepolymer A;

[0094] 2) Add 72.00g polyetheramine D230 (M w =230, BASFCorporation), keep the temperature of the system at 50°C, slowly add 47.00g of phenylglycidyl ether to it for partial capping, and react for 6h to obtain prepolymer B;

[0095] 3) Mix the above prepolymers A and B uniformly at 80°C, then add 45.00g of epoxy resin E-20 to it for epoxy-amine addition, react for 2 hours, and then add 20.64g of butyl shrink resin after the reaction is completed Glyceryl ether and 25.99g γ-glycidyl etheroxypropyl triethoxysilane capped the remaining primary amine...

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Abstract

The invention discloses a nonionic self-emulsifying waterborne epoxy curing agent and a preparation method thereof. The curing agent is prepared from the following raw materials in percentage by weight: 8-30% of basic amine, 5-25% of epoxy-terminated polyether, 7-25% of polyether amine, 5-10% of epoxy resin, 5-15% of a mono-epoxy compound, 0.5-3% of a silane coupling agent and 30-60% of water. The preparation method comprises the following steps: (1) conducting chain extension and partial blocking on basic amine to obtain a pre-polymer A; (2) conducting partial blocking on polyether amine to obtain a pre-polymer B; (3) combining the pre-polymer A and the pre-polymer B with the chain segment of epoxy resin, and carrying out blocking to obtain the curing agent. The curing agent can be cured with liquid epoxy resin or an epoxy resin dispersion for film forming, and the obtained film is excellent in flexibility, adhesive force, impact resistance and chemical reagent resistance; the curing agent is synthesized at relatively low temperature, and no solvent or catalyst needs to be added, so that safety and environmental protection are ensured, and the controllability is strong.

Description

technical field [0001] The invention relates to a nonionic self-emulsifying water-based epoxy curing agent and a preparation method thereof, belonging to the field of chemical coatings. Background technique [0002] In recent years, with the development of the global economy and the enhancement of environmental protection awareness, relevant national departments have successively issued a number of environmental protection policies to increase the control of environmental pollution. As a heavy polluting industry in the chemical industry, the paint industry has also been included in the list of governance. From February 1, 2015, the state will include paints with a volatile organic compound (VOC) content higher than 420g / L in the construction state into the scope of 4% consumption tax. Under the current social situation, solvent-based epoxy coatings with high VOC and flammability will gradually be eliminated by the market. Correspondingly, they are environmentally friendly, ...

Claims

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Application Information

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IPC IPC(8): C08G59/50C08G59/20C09D163/00
Inventor 高南赖映标马超张虎
Owner GUANGZHOU SUPER CHEM COATING CO LTDGUANGZHOU SUPER CHEM COATING CO LTD
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