Epoxy curing agent and preparation method thereof

By adding specific proportions of toughening agents, alicyclic diamines, epoxy resins and other components to the epoxy curing agent, a curing agent with extremely strong corrosion resistance is solved, and the existing epoxy curing agent cannot be effectively prevented. The problem of splashing and corrosion of organic solvents and electrolytes in the lithium battery industry has achieved effective protection and self-restoration of the floor.

CN119463120APending Publication Date: 2025-02-18SICHUAN GUORANMEI CHEMICAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202411467913.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-21
Publication Date
2025-02-18

AI Technical Summary

Technical Problem

In the new energy lithium battery industry factory buildings, especially in the electrode sheet manufacturing workshop, existing epoxy curing agents cannot effectively prevent the splashing and corrosion of organic solvents such as NMP and electrolyte, resulting in floor corrosion, discoloration, and damage.

Method used

The formulation of an epoxy curing agent, including toughening agents, alicyclic diamines, epoxy resins, inactive epoxy diluents, curing accelerators and terminal aminosilane coupling agents, is adopted to obtain specific ratios and preparations. Steps to form a curing agent with extremely strong corrosion resistance.

Benefits of technology

This epoxy curing agent not only has the function of curing epoxy resin, but also has extremely strong corrosion resistance. It can effectively protect the splashing of electrolyte and organic solvents in the lithium battery workshop, and has a certain self-recovery after long-term corrosion. .

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Abstract

The invention discloses an epoxy hardener and a preparation method thereof, and relates to the technical field of organic high-molecular compounds, in particular to an epoxy hardener and a preparation method thereof, the epoxy hardener comprises the following preparation raw materials: a flexibilizer, alicyclic diamine, epoxy resin, an inactive epoxy diluent, a curing accelerator and an amino-terminated silane coupling agent; the epoxy curing agent is prepared from the following components in parts by weight: 10 to 30 parts of a toughening agent, 10 to 40 parts of alicyclic diamine, 10 to 30 parts of epoxy resin, 10 to 20 parts of an inactive epoxy diluent, 1 to 5 parts of a curing accelerator and 0.5 to 4 parts of an amino-terminated silane coupling agent. The epoxy curing agent not only has the effect of curing epoxy resin, but also has extremely high corrosion resistance, particularly has a very good protection effect on splashing of an electrolyte and an organic solvent (mainly N-methyl pyrrolidone) in a lithium battery workshop, and after soaking corrosion of long-term splashed liquid, the paint surface strength has certain self-recovery property.
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Description

Technical Field

[0001] The invention relates to the technical field of organic polymer compounds, in particular to an epoxy curing agent and a preparation method thereof. Background Art

[0002] At present, there are many epoxy curing agents used in the epoxy flooring industry on the market. These curing agents can basically meet the purpose of curing epoxy floors. Although these products can meet the use needs of ordinary floor surfaces, they are used in new energy lithium battery industry factories. In pole piece manufacturing workshops, it is found that this type of epoxy floor does not have a good ground protection effect against splash corrosion of organic solvents and electrolytes such as NMP (N-methylpyrrolidone). It is very easy to cause floor corrosion, discoloration, and damage, which greatly affects the use and appearance of the workshop. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an epoxy curing agent and a preparation method thereof, which solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention is implemented by the following technical scheme: an epoxy curing agent and a preparation method thereof, comprising the following preparation raw materials:

[0005] Toughening agent, alicyclic diamine, epoxy resin, inactive epoxy diluent, curing accelerator, amino-terminated silane coupling agent;

[0006] The specific proportion of epoxy curing agent by weight is as follows:

[0007] 10-30 parts of toughening agent, 10-40 parts of alicyclic diamine, 10-30 parts of epoxy resin, 10-20 parts of inactive epoxy diluent, 1-5 parts of curing accelerator, and 0.5-4 parts of terminal amino silane coupling agent.

[0008] Optionally, the specific proportion of the epoxy curing agent in parts by weight is as follows:

[0009] 28 parts of toughening agent, 30 parts of alicyclic diamine, 22 parts of epoxy resin, 15 parts of inactive epoxy diluent, 3 parts of curing accelerator, and 2 parts of terminal amino silane coupling agent.

[0010] Optionally, the specific proportion of the epoxy curing agent in parts by weight is as follows:

[0011] 30 parts of toughening agent, 26 parts of alicyclic diamine, 23 parts of epoxy resin, 16 parts of inactive epoxy diluent, 4 parts of curing accelerator, and 1 part of terminal amino silane coupling agent.

[0012] A method for preparing an epoxy curing agent as claimed in any one of claims, comprising the following specific preparation steps:

[0013] Step 1: Weigh the toughening agent, alicyclic diamine and curing accelerator according to their weight, naturally heat the reactor to 40°C, and keep it warm for 30 minutes;

[0014] Step 2: Weigh the epoxy resin and add it into the reactor several times, maintain the temperature in the reactor at 50℃±0.5℃, and keep it warm for 2h;

[0015] Step 3: After the amine value of the reactants is determined to be qualified, add the inactive diluent, curing accelerator, and amino-terminated silane coupling agent into the reactor in sequence, stir for 15 minutes, cool to 30°C ± 0.5°C, and cool and discharge.

[0016] The present invention provides an epoxy curing agent and a preparation method thereof, which have the following beneficial effects:

[0017] The epoxy curing agent and the preparation method thereof not only have the effect of curing epoxy resin, but also have extremely strong corrosion resistance, especially for the splashing of electrolyte and organic solvent (mainly N-methylpyrrolidone) in the lithium battery workshop. After long-term immersion corrosion in splashing liquid, the paint surface strength has a certain self-recovery property. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Embodiment 1: An epoxy curing agent, including the following specific proportions of epoxy curing agent in parts by weight:

[0020] 28 parts of toughening agent, 30 parts of alicyclic diamine, 22 parts of epoxy resin, 15 parts of inactive epoxy diluent, 3 parts of curing accelerator, and 2 parts of terminal amino silane coupling agent.

[0021] The specific preparation steps are as follows:

[0022] Step 1: Weigh the toughening agent, alicyclic diamine and curing accelerator according to their weight, naturally heat the reactor to 40°C, and keep it warm for 30 minutes;

[0023] Step 2: Weigh the epoxy resin and add it into the reactor several times, maintain the temperature in the reactor at 50℃±0.5℃, and keep it warm for 2h;

[0024] Step 3: After the amine value of the reactants is determined to be qualified, add the inactive diluent, curing accelerator, and amino-terminated silane coupling agent into the reactor in sequence, stir for 15 minutes, cool to 30°C ± 0.5°C, and cool and discharge.

[0025] Embodiment 2: An epoxy curing agent, including the following specific proportions by weight of the epoxy curing agent:

[0026] 30 parts of toughening agent, 26 parts of alicyclic diamine, 23 parts of epoxy resin, 16 parts of inactive epoxy diluent, 4 parts of curing accelerator, and 1 part of terminal amino silane coupling agent.

[0027] The specific preparation steps are as follows:

[0028] Step 1: Weigh the toughening agent, alicyclic diamine and curing accelerator according to their weight, naturally heat the reactor to 40°C, and keep it warm for 30 minutes;

[0029] Step 2: Weigh the epoxy resin and add it into the reactor several times, maintain the temperature in the reactor at 50℃±0.5℃, and keep it warm for 2h;

[0030] Step 3: After the amine value of the reactants is determined to be qualified, add the inactive diluent, curing accelerator, and amino-terminated silane coupling agent into the reactor in sequence, stir for 15 minutes, cool to 30°C ± 0.5°C, and cool and discharge.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An epoxy curing agent, characterized in that The preparation includes the following raw materials: Toughening agent, alicyclic diamine, epoxy resin, inactive epoxy diluent, curing accelerator, amino-terminated silane coupling agent; The specific proportion of epoxy curing agent by weight is as follows: 10-30 parts of toughening agent, 10-40 parts of alicyclic diamine, 10-30 parts of epoxy resin, 10-20 parts of inactive epoxy diluent, 1-5 parts of curing accelerator, and 0.5-4 parts of terminal amino silane coupling agent.

2. An epoxy curing agent according to claim 1, characterized in that: The specific proportion of the epoxy curing agent in parts by weight is as follows: 28 parts of toughening agent, 30 parts of alicyclic diamine, 22 parts of epoxy resin, 15 parts of inactive epoxy diluent, 3 parts of curing accelerator, and 2 parts of terminal amino silane coupling agent.

3. An epoxy curing agent according to claim 1, characterized in that: The specific proportion of the epoxy curing agent in parts by weight is as follows: 30 parts of toughening agent, 26 parts of alicyclic diamine, 23 parts of epoxy resin, 16 parts of inactive epoxy diluent, 4 parts of curing accelerator, and 1 part of terminal amino silane coupling agent.

4. A method for preparing an epoxy curing agent according to any one of claims 1 to 3, characterized in that: The method comprises the following specific preparation steps: Step 1: Weigh the toughening agent, alicyclic diamine and curing accelerator according to their weight, naturally heat the reactor to 40°C, and keep it warm for 30 minutes; Step 2: Weigh the epoxy resin and add it into the reactor in several times, maintain the temperature in the reactor at 50℃±0.5℃, and keep it warm for 2h; Step 3: After the amine value of the reactants is determined to be qualified, add the inactive diluent, curing accelerator, and amino-terminated silane coupling agent into the reactor in sequence, stir for 15 minutes, cool to 30°C ± 0.5°C, and cool and discharge.