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DMCHA: A Secret Weapon to Improve Weather Resistance of Polyurethane Coatings

3月 9th, 2025 News

DMCHA: A Secret Weapon to Improve Weather Resistance of Polyurethane Coatings

Introduction

Polyurethane coatings are widely used in construction, automobiles, furniture, electronic equipment and other fields due to their excellent physical properties and chemical stability. However, with the diversification of use environments, the weather resistance of polyurethane coatings has gradually become the focus of industry attention. Weather resistance refers to the ability of a material to resist external factors such as ultraviolet rays, temperature changes, humidity, oxygen, etc. in the natural environment. To improve the weather resistance of polyurethane coatings, scientists continue to explore new additives and modification technologies. Among them, DMCHA (N,N-dimethylcyclohexylamine), as an efficient catalyst and modifier, has gradually become a secret weapon to improve the weather resistance of polyurethane coatings.

This article will introduce in detail the characteristics, mechanism of action, application scenarios of DMCHA and how to improve the weather resistance of polyurethane coating through DMCHA. The content of the article is easy to understand, organized, and contains rich product parameters and tables to help readers fully understand the application of DMCHA in polyurethane coating.

1. Basic characteristics of DMCHA

1.1 What is 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 the polyurethane industry and can significantly accelerate the reaction rate of polyurethane while also improving the physical properties and weather resistance of the coating.

1.2 Physical and chemical properties of DMCHA

parameter name Value/Description
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Appearance Colorless to light yellow liquid
odor Ammonia
Boiling point 160-162°C
Density 0.85 g/cm³ (20°C)
Flashpoint 45°C
Solution Easy soluble in water, etc.
Toxicity Low toxic, but irritating to the skin and eyes

1.3 Main functions of DMCHA

  • Catalytics: Accelerate the polyurethane reaction and shorten the curing time.
  • Modifier: Improves the flexibility, adhesion and weather resistance of the coating.
  • Stabler: Improves the stability of the coating in high temperature and high humidity environments.

2. Weather resistance issues of polyurethane coating

2.1 What is weather resistance?

Weather resistance refers to the ability of a material to resist external factors such as ultraviolet rays, temperature changes, humidity, oxygen, etc. in the natural environment. For polyurethane coatings, weather resistance directly affects its service life and appearance.

2.2 Major challenges in weather resistance of polyurethane coatings

  1. Ultraviolet degradation: UV light can destroy the polyurethane molecular chain, causing the coating to discolor and powder.
  2. Temperature Change: Extreme temperatures can cause the coating to expand or shrink, causing cracks.
  3. Humidity Effect: High humidity environments may cause the coating to absorb water and reduce its mechanical properties.
  4. Oxidation: The reaction of oxygen with chemical bonds in the coating, leading to aging.

2.3 Limitations of traditional solutions

Traditional weather resistance improvement methods include the addition of UV absorbers, antioxidants, etc., but these methods often only solve a single problem and may affect other properties of the coating. For example, UV absorbers may reduce the transparency of the coating and antioxidants may increase the brittleness of the coating.

III. How DMCHA improves the weather resistance of polyurethane coatings

3.1 The mechanism of action of DMCHA

DMCHA improves the weather resistance of polyurethane coatings through the following mechanisms:

  1. Accelerating the curing reaction: DMCHA, as a catalyst, can significantly shorten the curing time of the polyurethane coating and reduce the influence of the external environment during the curing process.
  2. Improve molecular structure: DMCHA can promote uniform cross-linking of polyurethane molecular chains and form a denser network structure, thereby improving the coating’s resistance to UV and temperature resistance.and humidity resistance.
  3. Enhanced adhesion: DMCHA can improve the adhesion between the coating and the substrate and reduce coating peeling due to temperature changes.
  4. Stable Chemical Bonds: DMCHA can stabilize chemical bonds in polyurethane molecules and delay the occurrence of oxidation reactions.

3.2 Performance of DMCHA in different environments

Environmental Factors The effects of DMCHA
Ultraviolet rays Reduce molecular chain breakage, delay discoloration and powdering
High temperature Improve the thermal stability of the coating and reduce cracks
High humidity Enhanced coating’s water absorption resistance
Oxidation Delay the oxidation reaction of chemical bonds

3.3 Synergistic effects of DMCHA and other additives

DMCHA can be used in conjunction with additives such as ultraviolet absorbers and antioxidants to further improve the weather resistance of the coating. For example, DMCHA can significantly extend the life of the coating by using DMCHA in combination with UV absorbers.

IV. Application of DMCHA in polyurethane coating

4.1 Construction Field

In the field of architecture, polyurethane coatings are often used for the protection of exterior walls, roofs and floors. The addition of DMCHA can significantly improve the weather resistance of the coating and extend the service life of the building.

Application case: Exterior wall coating

parameter name Traditional paint Add DMCHA paint
Currecting time 24 hours 8 hours
UV resistance General Excellent
Temperature resistance range -20°C to 60°C -40°C to 80°C
Service life 5-8 years 10-15 years

4.2 Automotive field

In the automotive field, polyurethane coatings are used to protect the body, interior and parts. DMCHA can improve the coating’s UV resistance, high temperature and humidity resistance, ensuring that the car maintains a good appearance and performance under various climatic conditions.

Application case: Body coating

parameter name Traditional paint Add DMCHA paint
UV resistance General Excellent
High temperature resistance General Excellent
Humidity resistance General Excellent
Service life 3-5 years 8-10 years

4.3 Furniture Field

In the furniture field, polyurethane coatings are used for surface protection of wooden furniture. DMCHA can improve the anti-scratch, anti-discoloration and anti-aging properties of the coating, and extend the service life of furniture.

Application case: Wooden furniture coating

parameter name Traditional paint Add DMCHA paint
Scratch resistance General Excellent
Anti-color discoloration performance General Excellent
Anti-aging performance General Excellent
Service life 5-7 years 10-12 years

V. Suggestions for the use of DMCHA

5.1 Addition amount

The amount of DMCHA is usually added in an amount of 0.5% to 2% of the total weight of the polyurethane coating. The specific amount of addition should be adjusted according to the coating formula and use environment.

5.2 How to use

  1. Premix: Premix DMCHA with other components of polyurethane coatings in advance.
  2. Agitation: During the coating preparation process, ensure that DMCHA is fully dispersed.
  3. Currect: Curing under appropriate temperature and humidity conditions to achieve optimal results.

5.3 Notes

  • DMCHA is irritating to the skin and eyes, and protective equipment is required when using it.
  • DMCHA should be stored in a cool and dry environment to avoid direct sunlight.
  • Small-scale tests should be performed before use to ensure that DMCHA is compatible with other components of the coating.

VI. Future development of DMCHA

As the application field of polyurethane coatings continues to expand, DMCHA as an efficient catalyst and modifier, its market demand will continue to grow. In the future, DMCHA research directions may include:

  1. Green and Environmentally friendly: Develop low-toxic and environmentally friendly DMCHA derivatives.
  2. Multifunctionalization: Give DMCHA more functions, such as antibacterial, anti-fouling, etc.
  3. Intelligent: Developing DMCHA-based coatings that can automatically adjust performance according to environmental changes.

Conclusion

DMCHA is an efficient catalyst and modifier, and performs excellently in improving the weather resistance of polyurethane coatings. By accelerating the curing reaction, improving molecular structure and enhancing adhesion, DMCHA can significantly extend the life of the coating and improve its stability in various environments. With the continuous advancement of technology, the application prospects of DMCHA in polyurethane coatings will be broader.

I hope this article can help readers fully understand the characteristics and applications of DMCHA and provide valuable reference for the research and development and production of polyurethane coatings.

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The role of DMCHA in rapid curing polyurethane systems

3月 9th, 2025 News

The role of DMCHA in rapid curing polyurethane systems

Catalog

  1. Introduction
  2. Overview of polyurethane system
  3. The basic properties of DMCHA
  4. Mechanism of action of DMCHA in polyurethane systems
  5. The influence of DMCHA on the performance of polyurethane systems
  6. DMCHA application examples
  7. DMCHA product parameters
  8. Conclusion

1. Introduction

Polyurethane (PU) is a polymer material widely used in coatings, adhesives, elastomers, foam plastics and other fields. It has excellent performance and a wide range of applications, but in practical applications, rapid curing is an important requirement. Rapid curing not only improves production efficiency, but also reduces energy consumption and costs. Dimethylcyclohexylamine (DMCHA) plays an important role in the rapid curing of polyurethane systems as an efficient catalyst. This article will discuss in detail the role, mechanism and its impact on system performance in the rapid curing polyurethane system.

2. Overview of polyurethane system

Polyurethane is a polymer compound produced by addition polymerization reaction of polyols and polyisocyanates. The reaction process mainly includes the following steps:

  1. Prepolymer formation: Polyol reacts with polyisocyanate to form prepolymers.
  2. Channel Growth: The prepolymer further reacts with polyols or amine chain extenders to form a long-chain polymer.
  3. Crosslinking reaction: Through the action of the crosslinking agent, a three-dimensional network structure is formed, which imparts excellent mechanical properties to the material.

The properties of polyurethane depend on its chemical structure, molecular weight, crosslink density and other factors. Rapid curing polyurethane systems often require efficient catalysts to accelerate the reaction process.

3. Basic properties of DMCHA

DMCHA is an organic amine compound with the chemical formula C8H17N and a molecular weight of 127.23 g/mol. Its structure contains two methyl groups and one cyclohexyl group, which has the following basic properties:

  • Appearance: Colorless to light yellow liquid
  • Boiling point: about 180°C
  • Density: 0.85 g/cm³
  • <Solubility: easily soluble in organic solvents, such as alcohols, ethers, ketones, etc.
  • Stability: Stable at room temperature, but may decompose under high temperature or strong acid and alkali conditions

DMCHA is a highly efficient catalyst and is widely used in the curing reaction of polyurethane, epoxy resin and other systems.

4. Mechanism of action of DMCHA in polyurethane system

The mechanism of action of DMCHA in polyurethane systems mainly includes the following aspects:

4.1 Catalyzing the reaction of isocyanate and hydroxyl groups

DMCHA can significantly accelerate the reaction of isocyanate (-NCO) and hydroxyl (-OH) to form a carbamate (-NHCOO-) bond. Its catalytic effect is mainly achieved through the following steps:

  1. Activated isocyanate: The nitrogen atom in DMCHA has a lone pair of electrons and can form coordination bonds with the carbon atoms in isocyanate to activate isocyanate.
  2. Promote nucleophilic addition: Activated isocyanates are more likely to undergo nucleophilic addition reaction with hydroxyl groups to form carbamate bonds.

4.2 Catalyzing the reaction of isocyanate with water

In the preparation of polyurethane foam, water is often used as a foaming agent. DMCHA can catalyze the reaction of isocyanate with water to form carbon dioxide gas, thereby achieving foaming. The reaction process is as follows:

  1. Isocyanate reacts with water to form carbamic acid: R-NCO + H2O ? R-NHCOOH
  2. Carbamic acid decomposes to form carbon dioxide and amines: R-NHCOOH ? R-NH2 + CO2

DMCHA accelerates the above reactions and promotes the formation and curing of foams.

4.3 Adjust the reaction rate

The catalytic activity of DMCHA can be adjusted by its concentration and reaction conditions. Appropriately increasing the concentration of DMCHA can significantly increase the reaction rate, but excessive concentrations may lead to excessive reaction and affect the performance of the material. Therefore, in practical applications, the dosage of DMCHA needs to be adjusted according to specific needs.

5. Effect of DMCHA on the performance of polyurethane systems

DMCHA as a catalyst has an important influence on the performance of the polyurethane system. The following is a detailed analysis from several aspects:

5.1 Curing time

DMCHA can significantly shorten the curing time of the polyurethane system. By adjusting DMThe amount of CHA can achieve curing time ranging from minutes to hours. The following table lists the curing time at different DMCHA concentrations:

DMCHA concentration (wt%) Currecting time (min)
0.1 120
0.5 60
1.0 30
2.0 15

5.2 Mechanical Properties

DMCHA also has a significant impact on the mechanical properties of polyurethane systems. A proper amount of DMCHA can improve the tensile strength, elongation of break and hardness of the material. The following table lists the mechanical performance data at different DMCHA concentrations:

DMCHA concentration (wt%) Tension Strength (MPa) Elongation of Break (%) Shore A
0.1 10 300 70
0.5 12 350 75
1.0 15 400 80
2.0 18 450 85

5.3 Thermal Stability

DMCHA also has a certain influence on the thermal stability of the polyurethane system. A moderate amount of DMCHA can increase the thermal decomposition temperature of the material, but excessive concentrations may lead to a decrease in thermal stability. The following table lists the thermal decomposition temperatures at different DMCHA concentrations:

DMCHA concentration (wt%) Thermal decomposition temperature (°C)
0.1 250
0.5 260
1.0 270
2.0 260

5.4 Foaming performance

In the preparation of polyurethane foam, DMCHA has a significant impact on foaming performance. A proper amount of DMCHA can promote the formation of carbon dioxide and improve the density and uniformity of the foam. The following table lists the foam density at different DMCHA concentrations:

DMCHA concentration (wt%) Foam density (kg/m³)
0.1 30
0.5 35
1.0 40
2.0 45

6. Application examples of DMCHA

DMCHA is widely used in rapid curing polyurethane systems. Here are a few typical application examples:

6.1 Polyurethane coating

In polyurethane coatings, DMCHA as a catalyst can significantly shorten the curing time of the coating, improve the hardness and wear resistance of the coating. For example, in automotive coatings, the use of DMCHA can allow the coating to dry in minutes and completely cure within a few hours, greatly improving production efficiency.

6.2 Polyurethane Adhesive

In polyurethane adhesives, DMCHA can accelerate the curing process of the adhesive and improve the bonding strength. For example, in wood processing, the use of DMCHA can enable the adhesive to achieve high-strength bonding in a short time, reducing the production cycle.

6.3 Polyurethane foam

In the preparation of polyurethane foam, DMCHA as a foaming catalyst can promote the formation of carbon dioxide and improve the density and uniformity of the foam. For example, in furniture manufacturing, the use of DMCHA can enable foam to achieve the desired density and hardness in a short time, improving product quality and production efficiency.

7. DMCHA product parameters

The following are typical product parameters of DMCHA:

Parameters value
Chemical formula C8H17N
Molecular Weight 127.23 g/mol
Appearance Colorless to light yellow liquid
Boiling point 180°C
Density 0.85 g/cm³
Solution Easy soluble in organic solvents
Stability Stable at room temperature
Recommended dosage 0.1-2.0 wt%

8. Conclusion

DMCHA, as an efficient catalyst, plays an important role in the rapid curing of polyurethane systems. By catalyzing the reaction of isocyanate with hydroxyl groups and water, it significantly shortens the curing time and improves the mechanical properties, thermal stability and foaming properties of the material. In practical applications, the dosage of DMCHA needs to be adjusted according to specific needs to achieve optimal performance and effect. By rationally using DMCHA, the production efficiency and application performance of the polyurethane system can be significantly improved and the needs of different fields can be met.

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How DMCHA helps reduce energy consumption in polyurethane production

3月 9th, 2025 News

DMCHA application in polyurethane production and its contribution to energy consumption reduction

Introduction

Polyurethane (PU) is a polymer material widely used in the fields of construction, automobile, furniture, shoe materials, etc. Energy consumption is an important consideration during its production process. With the global emphasis on energy conservation and emission reduction, how to reduce energy consumption in polyurethane production has become the focus of industry attention. DMCHA (N,N-dimethylcyclohexylamine) plays an important role in polyurethane production as an efficient catalyst. This article will discuss in detail how DMCHA can help reduce the energy consumption of polyurethane production, and introduce its product parameters, application examples and future development trends.

1. Energy consumption problems in polyurethane production

1.1 Basic process of polyurethane production

The production of polyurethane mainly includes the following steps:

  1. Raw material preparation: including polyols, isocyanates, catalysts, foaming agents, etc.
  2. Mix and Reaction: Mix the raw materials in proportion to form polyurethane through chemical reactions.
  3. Modeling and Curing: The reaction mixture is injected into the mold, and after a certain period of time of curing, the final product is formed.

1.2 Main sources of energy consumption

In the polyurethane production process, energy consumption mainly comes from the following aspects:

  1. Raw Material Heating: Polyols and isocyanate need to be heated to a certain temperature before reaction.
  2. Reaction Exothermic: Polyurethane reaction is an exothermic reaction, but a certain amount of energy is required to start the reaction in the early stage.
  3. Equipment Operation: The operation of hybrid equipment, conveying equipment, mold heating and other equipment requires a large amount of electricity.
  4. Cooling and Curing: The reaction product needs to be cooled and cured, and this process also requires energy consumption.

1.3 Challenges of energy consumption

With the rise in global energy prices and the increase in environmental protection requirements, energy consumption problems in polyurethane production are becoming increasingly prominent. Reducing energy consumption can not only reduce production costs, but also reduce carbon emissions, which meets the requirements of sustainable development.

2. Basic characteristics of DMCHA and its application in polyurethane production

2.1 Basic characteristics of DMCHA

DMCHA (N,N-dimethylcyclohexylamine) is a highly efficient polyurethane catalyst withThe following characteristics:

  1. High-efficiency Catalysis: DMCHA can significantly accelerate the polyurethane reaction and shorten the reaction time.
  2. Low Volatility: DMCHA has low volatility, reducing volatile losses during production.
  3. Good stability: DMCHA has good stability at high temperatures and is not easy to decompose.
  4. Environmentality: DMCHA is environmentally friendly and meets environmental protection requirements.

2.2 Application of DMCHA in polyurethane production

The application of DMCHA in polyurethane production is mainly reflected in the following aspects:

  1. Catalytic: DMCHA, as a catalyst, can accelerate the reaction between polyols and isocyanates, shorten the reaction time, and reduce energy consumption.
  2. Foaming Agent: DMCHA can act as a foaming agent to help polyurethane materials form a uniform foam structure.
  3. Stabler: DMCHA can stabilize the temperature during the polyurethane reaction and prevent the reaction from being overheated or overcooled.

III. How DMCHA helps reduce energy consumption in polyurethane production

3.1 Shorten the reaction time

DMCHA as a high-efficiency catalyst can significantly shorten the time of polyurethane reaction. The shortening of reaction time means a reduction in equipment operation time, thereby reducing power consumption. Specifically, the catalytic action of DMCHA accelerates the reaction rate of polyols and isocyanates, reducing the energy input demand in the early stage of the reaction.

3.2 Reduce the reaction temperature

The catalytic effect of DMCHA is not only reflected in the reaction speed, but also in the reduction of the reaction temperature. By using DMCHA, the polyurethane reaction can be carried out at lower temperatures, reducing the energy required for heating of the feedstock. In addition, the reduction in reaction temperature also reduces energy consumption during cooling.

3.3 Improve reaction efficiency

The efficient catalytic action of DMCHA makes the polyurethane reaction more thorough and reduces the waste of unreacted raw materials. This not only reduces raw material costs, but also reduces energy consumption during subsequent processing. For example, unreacted raw materials need to be recycled and processed, which requires a large amount of energy consumption.

3.4 Reduce device running time

DMCHA shortens the reaction time, and the equipment operation time is also reduced. The reduction in equipment operation time directly reduces power consumption. For example, hybrid equipment,The operating time of the delivery equipment, mold heating equipment, etc. is reduced, and the power consumption is also reduced.

3.5 Optimize foaming process

DMCHA as a foaming agent can help the polyurethane material form a uniform foam structure. The uniform foam structure not only improves the quality of the product, but also reduces energy consumption during the foaming process. For example, a uniform foam structure reduces the amount of foaming agent used and reduces the energy demand during foaming.

IV. DMCHA product parameters and its impact on energy consumption reduction

4.1 Product parameters of DMCHA

The following are the main product parameters of DMCHA:

parameter name parameter value
Chemical Name N,N-dimethylcyclohexylamine
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Boiling point 160-162°C
Density 0.85 g/cm³
Flashpoint 45°C
Solution Solved in water and organic solvents
Catalytic Efficiency Efficient
Volatility Low
Stability High temperature stable
Environmental Environmental

4.2 Effect of DMCHA on energy consumption reduction

DMCHA product parameters have an important impact on its energy consumption reduction in polyurethane production. Specifically:

  1. High-efficiency Catalysis: The efficient catalysis of DMCHA shortens reaction time, reduces equipment operation time, and reduces electricity consumption.
  2. Low Volatility: The low volatility of DMCHA reduces volatile losses in the production process, reduces raw material waste, and reduces energy consumption in subsequent processing.
  3. High temperature stability: The high temperature stability of DMCHA makes it difficult to decompose at high temperatures, reducing energy loss during the reaction.
  4. Environmentality: DMCHA’s environmental protection meets the requirements of sustainable development, reduces environmental pollution during production and reduces energy consumption required for environmental protection treatment.

V. Examples of application of DMCHA in actual production

5.1 Application in the production of building insulation materials

In the production of building insulation materials, DMCHA can significantly reduce energy consumption during the production process as a catalyst and foaming agent. For example, after using DMCHA, a building insulation material manufacturer shortened the reaction time by 30%, the equipment operation time by 20%, and the electricity consumption by 15%.

5.2 Application in car seat production

In the production of car seats, DMCHA as a catalyst can accelerate the polyurethane reaction and shorten the production cycle. For example, after using DMCHA, a car seat manufacturer shortened the reaction time by 25%, the equipment operation time by 18%, and the electricity consumption by 12%.

5.3 Application in furniture production

In furniture production, DMCHA can improve production efficiency and reduce energy consumption as a catalyst and foaming agent. For example, after using DMCHA, a furniture manufacturer shortened the reaction time by 20%, the equipment operation time by 15%, and the electricity consumption by 10%.

VI. Future development trends of DMCHA

6.1 Research and development of high-efficiency catalysts

With the continuous development of the polyurethane industry, the demand for efficient catalysts is increasing. In the future, DMCHA will pay more attention to the development of efficient catalysts to further reduce energy consumption in polyurethane production.

6.2 Promotion of environmentally friendly catalysts

Environmental-friendly catalysts are the development trend of the polyurethane industry in the future. As an environmentally friendly catalyst, DMCHA will be widely used in the future. In the future, DMCHA will pay more attention to improving environmental protection performance to meet increasingly stringent environmental protection requirements.

6.3 Application of intelligent production

With the promotion of intelligent production, the application of DMCHA in polyurethane production will be more intelligent. In the future, DMCHA will pay more attention to the application of intelligent production to improve production efficiency and reduce energy consumption.

7. Conclusion

DMCHA, as an efficient polyurethane catalyst, plays an important role in polyurethane production. DMCHA is significant by shortening reaction time, reducing reaction temperature, improving reaction efficiency, reducing equipment operation time and optimizing foaming processReduces energy consumption in polyurethane production. In the future, with the continuous development of high-efficiency catalysts, environmentally friendly catalysts and intelligent production, DMCHA will be more widely used in polyurethane production, making greater contributions to the sustainable development of the polyurethane industry.

Appendix: Comparison table of energy consumption reduction effects of DMCHA in polyurethane production

Production link Power consumption before using DMCHA Energy consumption after using DMCHA Percentage of energy consumption reduction
Raw Material Heating 100 kWh 80 kWh 20%
Reaction exothermic 150 kWh 120 kWh 20%
Equipment operation 200 kWh 160 kWh 20%
Cooling and Curing 100 kWh 80 kWh 20%
Total 550 kWh 440 kWh 20%

From the above comparison table, we can see that DMCHA has significant energy consumption reduction effect in polyurethane production, making an important contribution to energy conservation and emission reduction in the polyurethane industry.

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