Application of DMCHA in environmentally friendly polyurethane adhesives
Catalog
- Introduction
- Overview of polyurethane adhesives
- Introduction to DMCHA
- The role of DMCHA in polyurethane adhesives
- Advantages of environmentally friendly polyurethane adhesives
- Examples of application of DMCHA in environmentally friendly polyurethane adhesives
- Comparison of product parameters and performance
- Future development trends
- Conclusion
1. Introduction
With the increasing awareness of environmental protection and the increasingly strict environmental protection regulations, environmentally friendly materials are increasingly widely used in various fields. As an important industrial material, polyurethane adhesives have also received widespread attention in their environmental protection properties. DMCHA (N,N-dimethylcyclohexylamine) plays an important role in environmentally friendly polyurethane adhesives as a highly efficient catalyst. This article will introduce in detail the application of DMCHA in environmentally friendly polyurethane adhesives, including its mechanism of action, application examples, product parameters and future development trends.
2. Overview of polyurethane adhesives
Polyurethane adhesive is a polymer compound produced by the reaction of isocyanate and polyol, with excellent adhesive properties, weather resistance and chemical stability. Widely used in construction, automobile, furniture, packaging and other fields. The main components of polyurethane adhesives include isocyanates, polyols, catalysts, fillers and additives.
2.1 Classification of polyurethane adhesives
Depending on the curing method, polyurethane adhesives can be divided into two categories:
- Single-component polyurethane adhesive: cured by moisture or heating in the air, it is easy to use, but the curing speed is slow.
- Two-component polyurethane adhesive: consists of main agent and curing agent, which cures quickly after mixing, has high adhesive strength, but is complex in operation.
2.2 Performance characteristics of polyurethane adhesive
- High bonding strength: Can bond a variety of materials, such as metal, plastic, wood, ceramics, etc.
- Good weather resistance: It can maintain stable performance in harsh environments such as high temperature, low temperature, and humidity.
- Excellent chemical stability: resistant to oil, solvent, acid and alkali and other chemical substances.
- Adjustable curing speed: By adjusting the type and use of catalystThe curing speed can be controlled.
3. Introduction to DMCHA
DMCHA (N,N-dimethylcyclohexylamine) is an organic amine compound with the chemical formula C8H17N. It is a colorless to light yellow liquid with an ammonia odor and is easily soluble in water and organic solvents. DMCHA is mainly used as a catalyst in polyurethane reaction, which can significantly improve the reaction rate and improve the performance of the product.
3.1 Physical and chemical properties of DMCHA
| Properties | value |
|---|---|
| Molecular Weight | 127.23 g/mol |
| Boiling point | 159-161 °C |
| Density | 0.85 g/cm³ |
| Flashpoint | 45 °C |
| Solution | Easy soluble in water, etc. |
3.2 DMCHA synthesis method
The synthesis of DMCHA mainly produces N-methylcyclohexylamine through reaction of cyclohexylamine with formaldehyde, and then reacts with formaldehyde to produce N,N-dimethylcyclohexylamine. The specific reaction equation is as follows:
- Cyclohexylamine + Formaldehyde ? N-methylcyclohexylamine
- N-methylcyclohexylamine + formaldehyde ? N,N-dimethylcyclohexylamine
4. The role of DMCHA in polyurethane adhesives
DMCHA is mainly used as a catalyst in polyurethane adhesives, and its mechanism of action is as follows:
4.1 Catalyzing the reaction of isocyanate with polyols
DMCHA can accelerate the reaction of isocyanate with polyols to form polyurethane polymers. The reaction equation is as follows:
R-NCO + R’-OH ? R-NH-COO-R’
DMCHA promotes the nucleophilic addition reaction between isocyanate and polyol by providing an alkaline environment, thereby increasing the reaction rate.
4.2 Adjust the curing speed
The amount of DMCHA can adjust the curing speed of the polyurethane adhesive. A proper amount of DMCHA can enable the adhesive to achieve a higher bonding strength in a short period of time, while excessive amounts may lead to excessive reaction and affect operating performance.
4.3 Improve product performance
DMCHA can not only improve the reaction rate, but also improve the mechanical properties, heat resistance and weather resistance of polyurethane adhesives. By adjusting the amount of DMCHA, adhesive products with different properties can be obtained.
5. Advantages of environmentally friendly polyurethane adhesives
Environmentally friendly polyurethane adhesive refers to an adhesive that has less environmental impact during production and use. Its main advantages include:
5.1 Low VOC emissions
VOC (volatile organic compounds) is one of the main factors causing air pollution. Environmentally friendly polyurethane adhesives significantly reduce VOC emissions by using low VOC raw materials and optimizing production processes.
5.2 Non-toxic and harmless
Environmentally friendly polyurethane adhesives use non-toxic or low-toxic raw materials, reducing the harm to human health and the environment. Especially in interior decoration and furniture manufacturing, the use of environmentally friendly adhesives can effectively improve indoor air quality.
5.3 Biodegradable
Some environmentally friendly polyurethane adhesives use biodegradable raw materials that can decompose in the natural environment and reduce the long-term impact on the environment.
5.4 Energy saving and consumption reduction
The production process of environmentally friendly polyurethane adhesives usually uses energy-saving technology, reducing energy consumption and carbon emissions. At the same time, its excellent performance also extends the service life of the product and reduces resource waste.
6. Examples of application of DMCHA in environmentally friendly polyurethane adhesives
6.1 Construction Field
In the field of construction, environmentally friendly polyurethane adhesives are widely used in wall insulation, floor laying, roof waterproofing and other projects. As a catalyst, DMCHA can significantly improve the curing speed and bonding strength of the adhesive, ensuring construction quality and efficiency.
6.1.1 Wall insulation
In wall insulation projects, environmentally friendly polyurethane adhesives are used to bond insulation materials (such as polystyrene foam boards) and walls. The addition of DMCHA allows the adhesive to cure in a short time, ensuring the firm bond between the insulation material and the wall, and improving the insulation effect.
6.1.2 Floor laying
In floor laying, environmentally friendly polyurethane adhesive is used to bond floor materials and floors. The catalytic action of DMCHA allows the adhesive to achieve a high bonding strength in a short time, ensuring the flatness and stability of the floor.
6.2 Automobile Manufacturing
In automobile manufacturing, environmentally friendly polyurethane adhesives are used to bond body parts, interior materials and sealing strips, etc. The addition of DMCHA allows the adhesive to cure in a short time and improve production efficiency.
6.2.1 Body bonding
In car body bonding, environmentally friendly polyurethane adhesive is used to bond metal plates and plasticspart. The catalytic action of DMCHA allows the adhesive to achieve higher bonding strength in a short time, ensuring the firmness and stability of the vehicle body.
6.2.2 Interior material bonding
In the bonding of interior materials, environmentally friendly polyurethane adhesives are used to bond seats, carpets, ceilings, etc. The addition of DMCHA allows the adhesive to cure in a short time, ensuring the firmness and aesthetics of the interior materials.
6.3 Furniture Manufacturing
In furniture manufacturing, environmentally friendly polyurethane adhesives are used to bond wood, boards and decorative materials, etc. The catalytic action of DMCHA allows the adhesive to cure in a short time and improves production efficiency.
6.3.1 Wood bonding
In wood bonding, environmentally friendly polyurethane adhesives are used to bond wood boards and strips. The addition of DMCHA allows the adhesive to achieve higher bonding strength in a short time, ensuring the firmness and stability of the furniture.
6.3.2 Plate bonding
In sheet bonding, environmentally friendly polyurethane adhesive is used to bond plywood and density boards. The catalytic action of DMCHA allows the adhesive to cure in a short time, ensuring the flatness and stability of the sheet.
7. Comparison of product parameters and performance
7.1 Product parameters
The following are the product parameters of several common environmentally friendly polyurethane adhesives:
| Product Name | Currecting time | Bonding Strength | VOC content | Applicable temperature range |
|---|---|---|---|---|
| Environmental-friendly polyurethane adhesive A | 30 minutes | 10 MPa | <50 g/L | -20°C to 80°C |
| Environmental-friendly polyurethane adhesive B | 20 minutes | 12 MPa | <30 g/L | -30°C to 100°C |
| Environmental-friendly polyurethane adhesive C | 15 minutes | 15 MPa | <20 g/L | -40°C to 120°C |
7.2 Performance comparison
The following is a comparison of the performance of several common environmentally friendly polyurethane adhesives:
| Performance metrics | Environmental-friendly polyurethane adhesive A | Environmental-friendly polyurethane adhesive B | Environmental-friendly polyurethane adhesive C |
|---|---|---|---|
| Currecting time | 30 minutes | 20 minutes | 15 minutes |
| Bonding Strength | 10 MPa | 12 MPa | 15 MPa |
| VOC content | <50 g/L | <30 g/L | <20 g/L |
| Applicable temperature range | -20°C to 80°C | -30°C to 100°C | -40°C to 120°C |
8. Future development trends
8.1 High performance
With the advancement of technology, environmentally friendly polyurethane adhesives will develop towards high performance. By optimizing the formulation and process, the adhesive strength, heat resistance and weather resistance of the adhesive are improved, and the application scenarios with higher requirements are met.
8.2 Multifunctional
The future environmentally friendly polyurethane adhesive will not only have adhesive functions, but also have waterproof, fireproof, mildewproof and other functions. By adding functional additives, one dose can be used multiple times and the added value of the product can be increased.
8.3 Intelligent
With the development of intelligent manufacturing, environmentally friendly polyurethane adhesives will develop towards intelligence. By introducing intelligent materials and technologies, automatic adjustment and intelligent control of adhesives can be achieved, and production efficiency and product quality can be improved.
8.4 Greening
The green trend of environmentally friendly polyurethane adhesives will be further strengthened. By using renewable resources and bio-based raw materials, we will reduce our dependence on fossil resources, reduce the carbon footprint of our products, and achieve sustainable development.
9. Conclusion
DMCHA, as an efficient catalyst, plays an important role in environmentally friendly polyurethane adhesives. By accelerating the reaction of isocyanate with polyol, DMCHA can significantly improve the curing speed and bonding strength of the adhesive and improve product performance. Environmentally friendly polyurethane adhesives have the advantages of low VOC emissions, non-toxic and harmless, biodegradable, energy-saving and consumption-reducing, and are widely used in construction, automobiles, furniture and other fields. Future, theType-retaining polyurethane adhesives will develop towards high performance, multifunctionality, intelligence and greenness, providing more environmentally friendly and efficient bonding solutions to all industries.
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