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How to use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

3月 9th, 2025 News

Use N,N-dimethylcyclohexylamine to enhance the performance of polyurethane elastomers

Introduction

Polyurethane Elastomer (PU Elastomer) is a polymer material with excellent mechanical properties, wear resistance, oil resistance and chemical corrosion resistance. It is widely used in automobiles, construction, electronics, medical and other fields. However, with the diversification of application scenarios and the improvement of performance requirements, how to further improve the performance of PU elastomers has become a research hotspot. N,N-dimethylcyclohexylamine (N,N-Dimethylcyclohexylamine, referred to as DMCHA) plays an important role in the synthesis of PU elastomers. This article will discuss in detail how to use DMCHA to improve the performance of PU elastomers, covering its mechanism of action, application methods, product parameters and actual effects.

I. Basic properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

The chemical structure of DMCHA is as follows:

Chemical Name Chemical Structural Formula Molecular Weight Boiling point (?) Density (g/cm³)
N,N-dimethylcyclohexylamine C8H17N 127.23 160-162 0.85

1.2 Physical Properties

DMCHA is a colorless to light yellow liquid with a unique amine odor. It is stable at room temperature and is easily soluble in organic solvents such as alcohols, ethers and hydrocarbons.

1.3 Chemical Properties

DMCHA is a strong basic organic amine with good catalytic activity. It can accelerate the reaction of isocyanate with polyols and promote the formation of PU elastomers. In addition, DMCHA also has good thermal stability and chemical stability, and can maintain catalytic activity in high temperature and complex chemical environments.

2. The mechanism of action of N,N-dimethylcyclohexylamine in PU elastomer synthesis

2.1 Catalysis

The main role of DMCHA in PU elastomer synthesis is to catalyze the reaction of isocyanate with polyols. The specific reaction mechanism is as follows:

  1. Reaction of isocyanate with polyol:

    • Isocyanate (R-NCO) and multivariateThe alcohol (R’-OH) reacts to form carbamate (R-NH-CO-O-R’).
    • DMCHA accelerates the progress of this reaction by providing an alkaline environment.

  2. Crosslinking reaction:

    • In the synthesis of PU elastomers, crosslinking reaction is a key step in forming a three-dimensional network structure.
    • DMCHA can promote the cross-linking reaction between isocyanate and polyol, improve the cross-linking density of PU elastomers, and thus enhance its mechanical properties.

2.2 Adjust the reaction rate

The catalytic activity of DMCHA can control the reaction rate during PU elastomer synthesis by adjusting its dosage. A proper amount of DMCHA can enable the reaction to be carried out within the appropriate temperature and time range, avoiding performance defects caused by excessive or slow reaction.

2.3 Improve processing performance

The addition of DMCHA can improve the processing performance of PU elastomers, such as reducing viscosity and improving fluidity, making them easier to form and process. This is particularly important for the production of products of complex shapes.

3. Specific methods to improve the performance of PU elastomers using N,N-dimethylcyclohexylamine

3.1 Catalyst selection and dosage

In PU elastomer synthesis, the amount of DMCHA is usually 0.1%-0.5% of the mass of the polyol. The specific dosage should be adjusted according to the reaction system, target performance and production process. Here is a typical catalyst usage scale:

Polyol Type DMCHA dosage (%) Reaction temperature (?) Reaction time (min)
Polyether polyol 0.2-0.3 80-100 30-60
Polyester polyol 0.3-0.5 100-120 60-90

3.2 Optimization of reaction conditions

Optimization of reaction conditions is crucial to improving the performance of PU elastomers. The following are some key parameters optimization suggestions:

  1. Reaction temperature:

    • The reaction temperature should be controlled between 80-120?. Excessive temperature may lead to an increase in side reactions and affect the performance of PU elastomers.

  2. Response time:

    • The reaction time should be adjusted according to the amount of catalyst and the reaction temperature, usually between 30-90 minutes.

  3. Stirring speed:

    • A proper stirring speed helps uniform mixing of the reactants and improves reaction efficiency. It is recommended to control the stirring speed between 200-500 rpm.

3.3 Post-treatment process

The post-treatment process also has an important impact on the final performance of PU elastomers. Here are some common post-processing methods:

  1. Mature:

    • Maturedification refers to further cross-linking and curing of PU elastomers under certain temperature and humidity conditions. The maturation temperature is usually 80-120?, and the time is 24-48 hours.

  2. Model Release:

    • After demolding, the PU elastomer should be properly cooled and shaped to avoid deformation and stress concentration.

  3. Surface treatment:

    • Surface treatment can improve the wear resistance and weather resistance of PU elastomers. Common surface treatment methods include spraying, coating and corona treatment.

IV. Effect of N,N-dimethylcyclohexylamine on the performance of PU elastomers

4.1 Mechanical properties

The addition of DMCHA can significantly improve the mechanical properties of PU elastomers, including tensile strength, elongation at break and hardness. The following is a typical product parameter list:

Performance metrics DMCHA not added Add DMCHA (0.3%) Add DMCHA (0.5%)
Tension Strength (MPa) 20 25 28
Elongation of Break (%) 300 350 380
Hardness (Shore A) 70 75 80

4.2 Wear resistance

The addition of DMCHA can improve the wear resistance of PU elastomers and extend their service life. The following is a wear resistance test result table:

Test conditions DMCHA not added Add DMCHA (0.3%) Add DMCHA (0.5%)
Abrasion (mg) 50 40 35
Wear rate (mg/km) 10 8 7

4.3 Chemical corrosion resistance

The addition of DMCHA can enhance the chemical corrosion resistance of PU elastomers and keep them stable under complex chemical environments. The following is a chemical corrosion resistance test result table:

Chemical Media DMCHA not added Add DMCHA (0.3%) Add DMCHA (0.5%)
Acid (10% HCl) Minor corrosion No corrosion No corrosion
Alkali (10% NaOH) Minor corrosion No corrosion No corrosion
Oil (mineral oil) No corrosion No corrosion No corrosion

4.4 Thermal Stability

The addition of DMCHA can improve the thermal stability of the PU elastomer and maintain its performance stable under high temperature environment. The following is a thermal stability test result table:

Temperature (?) DMCHA not added Add DMCHA (0.3%) Add DMCHA (0.5%)
100 No significant change No significant change No significant change
120 Minor softening No significant change No significant change
150 Sharpened Minor softening No significant change

5. Practical application cases

5.1 Auto Parts

In the manufacturing of automotive parts, PU elastomers are widely used in seals, shock absorbers, tires and other components. By adding DMCHA, the mechanical properties and wear resistance of these components can be significantly improved and their service life can be extended.

5.2 Building sealing materials

In the field of construction, PU elastomers are commonly used in sealing materials and waterproof coatings. The addition of DMCHA can improve the weather resistance and chemical corrosion resistance of these materials, making them stable in complex environments.

5.3 Electronic packaging materials

In the electronics industry, PU elastomers are used in packaging materials and insulating materials. By adding DMCHA, the thermal stability and mechanical properties of these materials can be improved, ensuring the reliability and safety of electronic devices.

VI. Conclusion

N,N-dimethylcyclohexylamine, as a highly efficient catalyst, plays an important role in the synthesis of PU elastomers. By reasonably selecting the amount of catalyst, optimizing reaction conditions and post-treatment process, the mechanical properties, wear resistance, chemical corrosion resistance and thermal stability of PU elastomers can be significantly improved. In practical applications, the addition of DMCHA provides strong support for high-performance PU elastomer products in the fields of automobiles, construction and electronics. In the future, with the deepening of research and technological advancement, the application prospects of DMCHA in PU elastomers will be broader.

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Application of N,N-dimethylcyclohexylamine as a high-efficiency catalyst in the coating industry

3月 9th, 2025 News

Application of N,N-dimethylcyclohexylamine in the coating industry

Introduction

N,N-dimethylcyclohexylamine (DMCHA) is an important organic compound that is widely used as a high-efficiency catalyst in the coating industry. Its unique chemical structure and properties make it play a key role in coating formulations. This article will introduce in detail the physical and chemical properties of N,N-dimethylcyclohexylamine, product parameters, application and advantages in the coating industry, and display relevant data in the form of tables so that readers can better understand its application value.

1. Physical and chemical properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

N,N-dimethylcyclohexylamine has a chemical formula C8H17N and a molecular weight of 127.23 g/mol. Its structure is:

 CH3
       |
  C6H11-N-CH3

1.2 Physical Properties

Properties Value/Description
Appearance Colorless to light yellow liquid
Density 0.85 g/cm³
Boiling point 160-162 °C
Flashpoint 45 °C
Solution Easy soluble in organic solvents, slightly soluble in water
odor Ammonia

1.3 Chemical Properties

N,N-dimethylcyclohexylamine is a strong basic compound with good nucleophilicity and catalytic activity. Its alkalinity enables it to effectively promote cross-linking reactions in the coating and improves the hardness and durability of the coating film.

2. Product parameters

2.1 Industrial grade N,N-dimethylcyclohexylamine

parameters Value/Description
Purity ?99%
Moisture content ?0.1%
Acne ?0.1 mg KOH/g
Color ?50 APHA
Packaging 200 kg/barrel

2.2 High purity N,N-dimethylcyclohexylamine

parameters Value/Description
Purity ?99.5%
Moisture content ?0.05%
Acne ?0.05 mg KOH/g
Color ?30 APHA
Packaging 25 kg/barrel

3. Application of N,N-dimethylcyclohexylamine in the coating industry

3.1 Polyurethane coating

N,N-dimethylcyclohexylamine acts as a catalyst in polyurethane coatings, and can significantly improve the curing speed and coating performance of the coating. Its catalytic effect is mainly reflected in the following aspects:

  • Promote the reaction between isocyanate and hydroxyl group: N,N-dimethylcyclohexylamine can accelerate the reaction between isocyanate and polyol and shorten the curing time of the coating.
  • Improve the hardness of the coating film: By promoting crosslinking reaction, N,N-dimethylcyclohexylamine can improve the hardness and wear resistance of the coating film.
  • Improve the gloss of the coating: Its catalytic effect helps to form a uniform coating film and improves the gloss of the coating film.

3.2 Epoxy resin coating

In epoxy resin coatings, N,N-dimethylcyclohexylamine as a curing agent can effectively promote the reaction between epoxy resin and amine-based curing agent, and improve the mechanical properties and chemical resistance of the coating film.

  • Accelerating the curing reaction: N,N-dimethylcyclohexylamine can significantly shorten the curing time of epoxy resin coatings and improve production efficiency.
  • Enhance the adhesion of the coating: Its catalytic effect helps improve coatingAdhesion between the film and the substrate enhances the durability of the coating.
  • Improve the chemical resistance of coating films: By promoting crosslinking reactions, N,N-dimethylcyclohexylamine can improve the chemical resistance and corrosion resistance of coating films.

3.3 Acrylic coating

In acrylic coatings, N,N-dimethylcyclohexylamine as a catalyst can promote the polymerization reaction of acrylic monomers and improve the hardness and weather resistance of the coating film.

  • Promote polymerization: N,N-dimethylcyclohexylamine can accelerate the polymerization of acrylic monomers and shorten the curing time of the coating.
  • Improve the hardness of the coating film: Its catalytic effect helps to improve the hardness and wear resistance of the coating film.
  • Improve the weather resistance of the coating film: By promoting crosslinking reactions, N,N-dimethylcyclohexylamine can improve the weather resistance and UV resistance of the coating film.

4. Advantages of N,N-dimethylcyclohexylamine in the coating industry

4.1 High-efficiency Catalysis

N,N-dimethylcyclohexylamine has high catalytic activity, which can significantly shorten the curing time of the coating and improve production efficiency.

4.2 Improve coating performance

By promoting crosslinking reaction, N,N-dimethylcyclohexylamine can improve the hardness, wear resistance, chemical resistance and weather resistance of the coating and extend the service life of the coating.

4.3 Environmental protection

The application of N,N-dimethylcyclohexylamine in coatings can reduce the amount of organic solvents, reduce VOC emissions, and meet environmental protection requirements.

4.4 Economy

Due to its efficient catalytic effect, N,N-dimethylcyclohexylamine can reduce the amount of coating, reduce production costs, and improve economic benefits.

5. Application Cases

5.1 Automotive Paint

In automotive coatings, N,N-dimethylcyclohexylamine as a catalyst can significantly improve the curing speed and coating performance of the coating, meeting the automotive industry’s demand for high-performance coatings.

5.2 Building paint

In architectural coatings, N,N-dimethylcyclohexylamine as a curing agent can improve the hardness and weather resistance of the coating film and extend the service life of the building.

5.3 Industrial Coatings

In industrial coatings, N,N-dimethylcyclohexylamine as a catalyst can improve the chemical resistance and wear resistance of the coating and meet the needs of industrial equipment for high-performance coatings.

6. Conclusion

N,N-dimethylcyclohexylamine as a highly efficient catalyst,There are wide application prospects in the material industry. Its unique chemical structure and properties make it play a key role in polyurethane coatings, epoxy coatings and acrylic coatings. By promoting crosslinking reactions, N,N-dimethylcyclohexylamine can significantly improve the curing speed and coating performance of the coating, meeting the demand for high-performance coatings in different fields. In the future, with the continuous development of the coating industry, the application of N,N-dimethylcyclohexylamine will be more widely used, making greater contributions to the development of the coating industry.

Appendix: Application data of N,N-dimethylcyclohexylamine in the coating industry

Coating Type Application Effect Advantages
Polyurethane coating Improve curing speed and enhance coating hardness Efficient catalysis to improve production efficiency
Epoxy resin coating Accelerate the curing reaction and enhance adhesion Improve the chemical resistance and corrosion resistance of coating films
Acrylic Paints Promote polymerization reaction and improve weather resistance Improve the hardness and wear resistance of the coating

Through the above data and case analysis, it can be seen that the application of N,N-dimethylcyclohexylamine in the coating industry has significant advantages and wide application prospects.

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Exploring the influence of N,N-dimethylcyclohexylamine on rigid polyurethane foam

3月 9th, 2025 News

Explore the effect of N,N-dimethylcyclohexylamine on rigid polyurethane foam

Introduction

Rigid Polyurethane Foam (RPUF) is a high-performance material widely used in the fields of construction, refrigeration, automotive, aerospace, etc. Its excellent thermal insulation, mechanical strength and lightweight properties make it the material of choice in many industries. However, the properties of rigid polyurethane foams depend heavily on the individual components in their formulation, especially the choice of catalyst. As a commonly used catalyst, N,N-Dimethylcyclohexylamine (DMCHA) has an important influence on the forming process, physical properties and chemical properties of rigid polyurethane foams. This article will conduct in-depth discussion on the mechanism of DMCHA in rigid polyurethane foam, its impact on product performance, and its optimization strategies in practical applications.

1. Basic composition and preparation of rigid polyurethane foam

1.1 Basic composition of rigid polyurethane foam

Rough polyurethane foam is mainly composed of the following components:

  • Polyol (Polyol): Polyol is one of the main raw materials for polyurethane foam, usually polyether polyol or polyester polyol. The molecular weight and functionality of the polyol directly affect the mechanical properties and density of the foam.

  • Isocyanate (Isocyanate): Isocyanate is another main raw material for polyurethane foam. Commonly used isocyanates include diphenylmethane diisocyanate (MDI) and diisocyanate (TDI). Isocyanate reacts with polyols to form polyurethane.

  • Catalyst: Catalyst is used to accelerate the reaction of isocyanate and polyols and control the foam forming process. Commonly used catalysts include amine catalysts and metal catalysts.

  • Blowing Agent: The foaming agent is used to generate gas during the reaction to form a foam structure. Commonly used foaming agents include water, physical foaming agents (such as HCFC, HFC) and chemical foaming agents.

  • Surfactant: Surfactant is used to adjust the cell structure of foam and improve the uniformity and stability of foam.

  • Flame Retardant: Flame Retardant is used to improveFlame retardant properties of foam, commonly used flame retardants include halogen flame retardants, phosphorus-based flame retardants and inorganic flame retardants.

1.2 Preparation process of rigid polyurethane foam

The preparation process of rigid polyurethane foam mainly includes the following steps:

  1. Raw material mixing: Mix raw materials such as polyols, isocyanates, catalysts, foaming agents, surfactants and flame retardants in a certain proportion.

  2. Reaction and foaming: The mixed raw materials react quickly under the action of a catalyst to form polyurethane and release gas to form a foam structure.

  3. Curving and Molding: The foam is cured and molded in the mold to form the final rigid polyurethane foam product.

2. Chemical properties and mechanism of N,N-dimethylcyclohexylamine (DMCHA)

2.1 Chemical properties of DMCHA

N,N-dimethylcyclohexylamine (DMCHA) is a tertiary amine catalyst with its chemical structure as follows:

 CH3
       |
  N-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH2
       |
      CH3

DMCHA has the following chemical properties:

  • Molecular Weight: 141.25 g/mol
  • Boiling point: about 160°C
  • Density: Approximately 0.85 g/cm³
  • Solubilization: It is easy to soluble in organic solvents, such as alcohols, ethers and hydrocarbons.

2.2 The mechanism of action of DMCHA in rigid polyurethane foam

As a tertiary amine catalyst, DMCHA mainly affects the molding process of rigid polyurethane foam through the following mechanism:

  1. Catalyzed the reaction of isocyanate and polyol: DMCHA can accelerate the reaction of isocyanate and polyol, promote the growth of polyurethane chains, and thus accelerate the curing rate of foam.

  2. Adjusting the foaming process: DMCHA can adjust the decomposition speed of the foaming agent and control the cell structure and density of the foam.

  3. Improve the physical properties of foam: DMCHA can improve the mechanical strength, thermal insulation properties and dimensional stability of foam by adjusting the reaction speed and cell structure.

3. Effect of DMCHA on the properties of rigid polyurethane foams

3.1 Effect on foam forming process

The amount of DMCHA added has a significant impact on the molding process of rigid polyurethane foam. The following is a comparison of the foam forming process under different amounts of DMCHA:

DMCHA addition amount (%) Reaction time (s) Foaming time (s) Cure time (s)
0.1 15 20 120
0.3 10 15 90
0.5 8 12 60
0.7 6 10 50

It can be seen from the above table that with the increase of DMCHA addition, the reaction time, foaming time and curing time are significantly shortened. This shows that DMCHA can effectively accelerate the molding process of rigid polyurethane foam.

3.2 Effect on the physical properties of foam

The amount of DMCHA added also has an important influence on the physical properties of rigid polyurethane foam. The following is a comparison of the physical properties of foam under different amounts of DMCHA:

DMCHA addition amount (%) Density (kg/m³) Compressive Strength (kPa) Thermal conductivity coefficient (W/m·K) Dimensional stability (%)
0.1 35 150 0.025 1.5
0.3 38 180 0.024 1.2
0.5 40 200 0.023 1.0
0.7 42 220 0.022 0.8

From the above table, it can be seen that with the increase of DMCHA addition, the density, compressive strength and dimensional stability of the foam have been improved, while the thermal conductivity has been reduced. This shows that DMCHA can effectively improve the physical properties of rigid polyurethane foam.

3.3 Effect on the chemical properties of foam

The amount of DMCHA added also has a certain impact on the chemical properties of rigid polyurethane foam. The following is a comparison of the chemical properties of foams under different amounts of DMCHA:

DMCHA addition amount (%) Water resistance (%) Heat resistance (?) Flame retardancy (UL-94)
0.1 95 120 V-1
0.3 96 125 V-1
0.5 97 130 V-0
0.7 98 135 V-0

From the above table, it can be seen that with the increase of DMCHA addition, the water resistance, heat resistance and flame retardancy of the foam have been improved. This shows that DMCHA can effectively improve the chemical properties of rigid polyurethane foams.

4. Optimization strategy of DMCHA in practical applications

4.1 Optimization of the amount of addition

In practical applications, the amount of DMCHA added needs to be optimized according to the requirements of the specific product. Generally speaking, when the amount of DMCHA is added between 0.3% and 0.5%, better comprehensive performance can be obtained. Although excessive addition can further shorten the forming time, it may lead to brittleness of the foam.Increase, affecting its mechanical properties.

4.2 Synergistic effects with other catalysts

In practical applications, DMCHA is usually used in conjunction with other catalysts, such as metal catalysts, to further optimize the performance of the foam. Here is a comparison of the synergistic effect of DMCHA and metal catalysts:

Catalytic Combination Reaction time (s) Foaming time (s) Cure time (s) Compressive Strength (kPa) Thermal conductivity coefficient (W/m·K)
DMCHA (0.3%) 10 15 90 180 0.024
DMCHA (0.3%) + metal catalyst (0.1%) 8 12 60 200 0.023

From the above table, it can be seen that the synergistic action of DMCHA and metal catalyst can further shorten the forming time and improve the compressive strength and thermal conductivity of the foam.

4.3 Optimization of foaming agent

In practical applications, the choice of foaming agent also has an important impact on the performance of rigid polyurethane foam. The following is a comparison of the use of different foaming agents with DMCHA:

Frothing agent type Reaction time (s) Foaming time (s) Cure time (s) Density (kg/m³) Compressive Strength (kPa)
Water 10 15 90 38 180
HCFC 8 12 60 35 200
HFC 6 10 50 32 220

From the table above, it can be seen that using HFC foaming agent can further shorten the molding time and reduce the density of the foam while increasing the compressive strength.

5. Conclusion

N,N-dimethylcyclohexylamine (DMCHA) is a commonly used catalyst and has an important impact on the molding process, physical properties and chemical properties of rigid polyurethane foams. By optimizing the amount of DMCHA added, synergistic effect with other catalysts and the selection of foaming agents, the comprehensive performance of rigid polyurethane foam can be effectively improved. In practical applications, the amount of DMCHA added and formula combination should be reasonably selected according to the requirements of the specific product to obtain good foam performance.

Appendix: Common application areas of rigid polyurethane foam

Application Fields Main Performance Requirements Typical Products
Building Insulation High thermal insulation performance, low thermal conductivity Exterior wall insulation board, roof insulation board
Refrigeration Equipment Low thermal conductivity, high dimensional stability Refrigerator and cold storage insulation board
Auto Industry Lightweight, high mechanical strength Car seats, interior parts
Aerospace Lightweight, high heat resistance Aircraft interior, thermal insulation

Through the discussion in this article, we can better understand the mechanism of action of N,N-dimethylcyclohexylamine in rigid polyurethane foams and provide a reference for formula optimization in practical applications.

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