DMCHA (N,N-dimethylcyclohexylamine): Technical support for higher adhesion for high-performance sealants
Introduction
In modern industrial and construction fields, the application of sealant is everywhere. Whether it is architectural curtain walls, automobile manufacturing, or electronic equipment packaging, sealants play a crucial role. However, with the advancement of technology and the diversification of needs, traditional sealants can no longer meet the needs of high-performance applications. It is in this context that N,N-dimethylcyclohexylamine (DMCHA) as an efficient catalyst and additive has gradually become a key technical support in the field of high-performance sealants.
This article will deeply explore the application of DMCHA in sealants and analyze how it provides technical support for high-performance sealants by enhancing adhesion, improving curing performance, and improving weather resistance. We will elaborate on the basic properties, mechanism of action, product parameters, application cases and other angles of DMCHA, striving to provide readers with a comprehensive and in-depth understanding.
1. Basic properties of DMCHA
1.1 Chemical structure and physical properties
DMCHA, whose full name is N,N-dimethylcyclohexylamine, is an organic compound with its chemical structure as follows:
CH3
|
N-CH3
/
C6H10 C6H10DMCHA is a colorless to light yellow liquid with a typical amine odor. Its molecular weight is 141.25 g/mol, the boiling point is 165-167°C, and the density is 0.86 g/cm³. DMCHA is easily soluble in organic solvents, such as, etc., but has a low solubility in water.
1.2 Chemical Properties
DMCHA is a tertiary amine, which has strong alkalinity and can react with acid to form a salt. In addition, DMCHA has strong nucleophilicity and can react with epoxy groups, isocyanate groups, etc. Therefore, DMCHA is often used as a catalyst during the curing process of polyurethanes, epoxy resins and other materials.
2. The mechanism of action of DMCHA in sealants
2.1 Catalysis
One of the main functions of DMCHA in sealants is to act as a catalyst to accelerate the curing reaction. Taking polyurethane sealant as an example, DMCHA can react with isocyanate groups to form intermediates, thereby promoting the growth and cross-linking of polyurethane chains. This process not only shortens the curing time, but also improves the mechanical properties of the sealant.
2.1.1 Catalytic mechanism
The catalytic effect of DMCHA is mainly achieved through the following steps:
- Nuclear-pro-attack: The nitrogen atoms in DMCHA have lone pairs of electrons and can nucleophilic attack on carbon atoms in isocyanate groups to form intermediates.
- Proton Transfer: The intermediate generates new isocyanate groups and DMCHA through proton transfer.
- Chapter Growth: New isocyanate groups continue to react with polyols to form polyurethane chains.
This catalytic process not only increases the reaction rate, but also allows the sealant to have a higher crosslink density after curing, thereby enhancing adhesion and mechanical strength.
2.2 Enhance adhesion
DMCHA significantly enhances the adhesiveness of the sealant by improving the curing properties and cross-linking density of the sealant. Specifically, DMCHA can:
- Improving crosslinking density: Through catalytic action, DMCHA causes the sealant to form more crosslinking points during the curing process, thereby improving the overall strength of the material.
- Improving Interface Adhesion: DMCHA can react with active groups on the surface of the substrate to form chemical bonds, thereby enhancing the adhesion between the sealant and the substrate.
2.3 Improve weather resistance
DMCHA can also improve its weather resistance by adjusting the molecular structure of the sealant. Specifically, DMCHA can:
- Improving heat resistance: By increasing the crosslinking density, DMCHA allows the sealant to maintain high mechanical properties in high temperature environments.
- Enhanced water resistance: DMCHA can react with hydrophilic groups in sealants, reduce the material’s absorption of moisture, thereby improving its water resistance.
III. Product parameters of DMCHA
In order to better understand the application of DMCHA in sealants, we have sorted out the main product parameters of DMCHA, as shown in the following table:
| parameter name | Value/Description |
|---|---|
| Molecular Weight | 141.25 g/mol |
| Boiling point | 165-167°C |
| Density | 0.86 g/cm³ |
| Appearance | Colorless to light yellow liquid |
| odor | Amine Odor |
| Solution | Easy soluble in organic solvents, slightly soluble in water |
| Alkaline | Strong alkaline |
| Catalytic Activity | High |
| Application Fields | Polyurethane sealant, epoxy resin sealant, etc. |
IV. Application cases of DMCHA in high-performance sealant
4.1 Building curtain wall sealant
In the field of architectural curtain walls, sealants not only need to have good adhesion, but also need to have excellent weather resistance and aging resistance. Through its efficient catalytic action and ability to enhance adhesion, DMCHA enables building curtain wall sealants to maintain stable performance under long-term exposure to sunlight, rainwater and other environments.
4.1.1 Application Effect
- Adhesion enhancement: The adhesive strength of sealant using DMCHA to substrates such as glass and aluminum alloy has been increased by more than 20%.
- Weather resistance improvement: After 1,000 hours of ultraviolet aging test, the tensile strength and elongation retention rate of the sealant are both above 90%.
4.2 Automobile manufacturing sealant
In automobile manufacturing, sealant is widely used in body joints, window seals and other parts. Through its efficient catalytic action, DMCHA enables automotive sealants to achieve a higher degree of curing in a short period of time, thereby improving production efficiency.
4.2.1 Application effect
- Shortening time: The curing time of using DMCHA sealant at room temperature was reduced by 30%.
- Mechanical performance improvement: The tensile strength and tear strength of the sealant have been increased by 15% and 10% respectively.
4.3 Electronic equipment packaging sealant
In the field of electronic equipment packaging, sealants need to have excellent insulation properties and heat resistance. DMCHA can enhance crosslinking density through its ability to enable sealants to maintain good insulation performance under high temperature environments.
4.3.1 Application Effect
- Enhanced Heat Resistance: Use DMCHA SealantThe insulation resistance retention rate at 150°C is above 95%.
- Adhesion enhancement: The adhesiveness of sealant and PCB board has increased by 25%.
V. Future development trends of DMCHA
With the increasing demand for high-performance sealants, DMCHA, as a highly efficient catalyst and additive, has a broad application prospect. In the future, the development trends of DMCHA may include:
- Green and Environmental Protection: With the increase in environmental protection requirements, the synthesis process of DMCHA may develop in a more environmentally friendly direction and reduce its impact on the environment.
- Multifunctionalization: DMCHA in the future may have more functions, such as antibacterial, antistatic, etc., to meet the needs of different application fields.
- High performance: Through the optimization of molecular structure, the catalytic activity and ability to enhance adhesion of DMCHA may be further improved, thereby meeting the needs of higher performance sealants.
VI. Conclusion
DMCHA plays a crucial role in the field of high-performance sealants as an efficient catalyst and additive. Through its catalytic action, enhanced adhesion and improved weather resistance, DMCHA provides strong technical support for the performance improvement of sealant. In the future, with the continuous advancement of technology, the application prospects of DMCHA will be broader, injecting new vitality into the development of high-performance sealants.
Appendix: Comparison table of application effects of DMCHA in different sealants
| Sealant Type | Application Fields | Adhesion enhancement | Shortening time | Elevated weather resistance | Heat resistance is improved |
|---|---|---|---|---|---|
| Building Curtain Wall Sealant | Building Curtain Wall | 20% | – | 90% | – |
| Automotive Sealant | Automotive Manufacturing | 15% | 30% | – | – |
| Electronic Equipment Packaging Sealant | Electronic Equipment Packaging | 25% | – | – | 95% |
Through the detailed explanation of the above content, we can see that the application of DMCHA in high-performance sealants not only has significant technical advantages, but also has broad market prospects. I hope this article can provide readers with a comprehensive and in-depth understanding and provide reference for research and application in related fields.
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