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Application of N,N-dimethylcyclohexylamine in high-performance foam plastics

3月 9th, 2025 News

Application of N,N-dimethylcyclohexylamine in high-performance foam plastics

Introduction

N,N-dimethylcyclohexylamine (DMCHA) is an important organic compound and is widely used in chemical industry, medicine, pesticide and other fields. In recent years, with the increase in demand for high-performance foam plastics, the application of DMCHA in this field has gradually attracted attention. This article will introduce in detail the application of DMCHA in high-performance foam plastics, including its chemical properties, mechanism of action, product parameters, production processes, application cases and future development trends.

1. Chemical properties of N,N-dimethylcyclohexylamine

1.1 Molecular Structure

The molecular formula of DMCHA is C8H17N, and the structural formula is:

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

1.2 Physical Properties

Properties value
Molecular Weight 127.23 g/mol
Boiling point 159-160 °C
Density 0.85 g/cm³
Flashpoint 38 °C
Solution Easy soluble in organic solvents, slightly soluble in water

1.3 Chemical Properties

DMCHA is a strong basic organic amine with high reactivity. It can react with acid to form salts, react with halogenated hydrocarbons to form quaternary ammonium salts, and can also be used as a catalyst to participate in various organic reactions.

2. The mechanism of action of DMCHA in high-performance foam plastics

2.1 Foaming agent

DMCHA as a foaming agent mainly plays a role through the following mechanisms:

  1. Gas generation: DMCHA decomposes at high temperatures to produce gases such as nitrogen and carbon dioxide to form foam structures.
  2. Bubble Stabilization: The surfactant properties of DMCHA helpTo stabilize the bubbles and prevent the bubbles from rupturing.
  3. Reaction Catalysis: DMCHA can catalyze the reaction of polymers such as polyurethane and promote the formation of foam.

2.2 Catalyst

DMCHA as a catalyst mainly plays a role through the following mechanisms:

  1. Accelerating reaction: DMCHA can accelerate the reaction between isocyanate and polyol and shorten the molding time of foam plastic.
  2. Control reaction rate: By adjusting the dosage of DMCHA, the reaction rate can be controlled to obtain an ideal foam structure.
  3. Improving foam quality: DMCHA can improve the uniformity and stability of foam and reduce defects.

3. Product parameters

3.1 Technical indicators of DMCHA

Indicators value
Purity ?99%
Moisture ?0.1%
Color ?20 APHA
Acne ?0.1 mg KOH/g
Alkaline value ?99%

3.2 Technical indicators of high-performance foam plastics

Indicators value
Density 30-50 kg/m³
Compressive Strength ?150 kPa
Thermal conductivity ?0.025 W/(m·K)
Water absorption ?3%
Dimensional stability ?2%

4. Production process

4.1 Raw material preparation

  1. Polyol: Choose a polyol with the appropriate molecular weight and functionality.
  2. Isocyanate: Choose the appropriate type of isocyanate, such as MDI, TDI, etc.
  3. Foaming Agent: DMCHA is selected as the foaming agent and catalyst.
  4. Adjuvant: Add stabilizers, flame retardants and other additives.

4.2 Mixing and reaction

  1. Mix: Mix polyols, isocyanates, DMCHA and other additives in proportion.
  2. Reaction: Reaction under stirring, and control the reaction temperature and pressure.
  3. Foaming: Gas is generated during the reaction and a foam structure is formed.

4.3 Molding and post-treatment

  1. Modeling: Inject foam plastic into the mold and mold.
  2. Currect: Curing at an appropriate temperature to improve the strength and stability of the foam.
  3. Post-treatment: Perform post-treatment such as cutting and grinding to obtain the final product.

5. Application Cases

5.1 Building insulation materials

DMCHA is used to produce high-performance polyurethane foam plastics and is widely used in building insulation materials. Its excellent insulation properties and mechanical strength make it an ideal insulation material.

5.2 Car interior

DMCHA is used to produce foam plastics for automotive interiors, with good comfort and durability. Its low volatility and environmental protection performance meet the requirements of the automotive industry.

5.3 Packaging Materials

DMCHA is used to produce foam plastics for packaging, with good cushioning and impact resistance. Its light weight and high strength make it an ideal packaging material.

6. Future development trends

6.1 Environmentally friendly foaming agent

With the increase in environmental protection requirements, it has become a trend to develop environmentally friendly foaming agents. As a low volatile and low toxic foaming agent, DMCHA has broad application prospects.

6.2 High-performance foam

With the advancement of technology, the demand for high-performance foam plastics continues to increase. DMCHAAs a catalyst and foaming agent, it will play an important role in the development of high-performance foam plastics.

6.3 Intelligent production

Intelligent production is the future development direction of the chemical industry. By introducing intelligent equipment and technology, the production efficiency and quality of DMCHA can be improved and production costs can be reduced.

Conclusion

The application of N,N-dimethylcyclohexylamine in high-performance foam plastics has broad prospects. Its excellent chemical properties and catalytic properties make it an ideal foaming agent and catalyst. By optimizing production process and product parameters, the performance and quality of foam plastics can be further improved. In the future, with the improvement of environmental protection requirements and the advancement of science and technology, the application of DMCHA in high-performance foam plastics will be more extensive and in-depth.

Table 1: Physical Properties of DMCHA

Properties value
Molecular Weight 127.23 g/mol
Boiling point 159-160 °C
Density 0.85 g/cm³
Flashpoint 38 °C
Solution Easy soluble in organic solvents, slightly soluble in water

Table 2: Technical indicators of high-performance foam plastics

Indicators value
Density 30-50 kg/m³
Compressive Strength ?150 kPa
Thermal conductivity ?0.025 W/(m·K)
Water absorption ?3%
Dimensional stability ?2%

Table 3: Technical Indicators of DMCHA

Indicators value
Purity ?99%
Moisture ?0.1%
Color ?20 APHA
Acne ?0.1 mg KOH/g
Alkaline value ?99%

Through the above content, we have introduced in detail the application of N,N-dimethylcyclohexylamine in high-performance foam plastics. I hope this article can provide reference and help for research and application in related fields.

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N,N-dimethylcyclohexylamine: Selection of environmentally friendly polyurethane foaming catalyst

3月 9th, 2025 News

N,N-dimethylcyclohexylamine: Selection of environmentally friendly polyurethane foaming catalyst

Introduction

Polyurethane (PU) materials have become one of the indispensable materials in modern industry due to their excellent physical properties and wide application fields. Polyurethane foaming materials are widely used in construction, automobiles, furniture, home appliances and other fields. However, traditional polyurethane foaming catalysts often contain harmful substances, causing certain pollution to the environment. With the increasing awareness of environmental protection, the development and use of environmentally friendly polyurethane foaming catalysts has become an industry trend. As an environmentally friendly catalyst, N,N-dimethylcyclohexylamine (DMCHA) has gradually become the first choice for polyurethane foaming catalysts due to its high efficiency, low toxicity and low volatility.

1. Basic properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

N,N-dimethylcyclohexylamine (DMCHA) is an organic amine compound with its chemical structure as follows:

 CH3
       |
  C6H11-N-CH3

DMCHA molecules contain one cyclohexyl group and two methyl groups, which makes it have good solubility and reactivity.

1.2 Physical Properties

Properties Value/Description
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Appearance Colorless to light yellow liquid
Boiling point 160-162°C
Density 0.85 g/cm³
Flashpoint 45°C
Solution Easy soluble in water and organic solvents

1.3 Chemical Properties

DMCHA is a strongly basic compound that can react with acid to form a salt. Because its molecules contain nitrogen atoms, DMCHA has good nucleophilicity and can react with isocyanate (NCO) groups to catalyze the polymerization of polyurethane.

2. Application of DMCHA in polyurethane foaming

2.1 Basic principles of polyurethane foaming

Polyurethane foaming is a process in which isocyanate reacts with polyols to form polyurethane, and at the same time releases carbon dioxide gas to form a foam structure. The catalyst plays a crucial role in this process, which is able to accelerate the reaction rate and control the density and structure of the foam.

2.2 Catalytic mechanism of DMCHA

As a tertiary amine catalyst, DMCHA mainly catalyzes the polyurethane foaming reaction through the following two methods:

  1. Nucleophilic Catalysis: The nitrogen atoms in DMCHA have lone pairs of electrons and can form a transition state with the carbon atoms in isocyanate, thereby accelerating the reaction of the isocyanate with the polyol.
  2. Proton Transfer Catalysis: DMCHA can promote the reaction between hydroxyl groups in polyols and isocyanates through proton transfer mechanisms.

2.3 Advantages of DMCHA

Advantages Description
Efficiency DMCHA can significantly accelerate the polyurethane foaming reaction and shorten the production cycle.
Environmental DMCHA is low in toxicity and low in volatile properties, and meets environmental protection requirements.
Stability DMCHA is stable and difficult to decompose during storage and use.
Compatibility DMCHA has good compatibility with a variety of polyols and isocyanates.

3. Comparison of DMCHA with other catalysts

3.1 Disadvantages of traditional catalysts

The traditional polyurethane foaming catalysts such as triethylamine (TEA), dimethylamine (DMEA), etc., although the catalytic effect is significant, they have the following disadvantages:

  • High toxicity: Traditional catalysts are often highly toxic and pose a threat to the health of operators.
  • Strong volatile: Traditional catalysts are easy to volatile and cause environmental pollution.
  • Poor stability: Traditional catalysts are easy to decompose during storage and use, affecting the catalytic effect.

3.2 Comparison between DMCHA and traditional catalysts

Catalyzer Toxicity Volatility Stability Catalytic Efficiency
Triethylamine (TEA) High High Poor High
Dimethylamine (DMEA) in in in in
N,N-dimethylcyclohexylamine (DMCHA) Low Low High High

It can be seen from the table that DMCHA is better than traditional catalysts in terms of toxicity, volatility and stability, and has high catalytic efficiency. It is an ideal environmentally friendly polyurethane foaming catalyst.

4. Application examples of DMCHA

4.1 Building insulation materials

Among building insulation materials, polyurethane foaming materials are widely used in insulation layers of walls, roofs and floors due to their excellent insulation properties and lightweight properties. As a catalyst, DMCHA can effectively control the foaming process, ensure the uniformity and stability of the foam, thereby improving the performance of the insulation material.

4.2 Car interior

In car interior, polyurethane foaming material is used in seats, headrests, armrests and other parts to provide a comfortable riding experience. The low toxicity and low volatility of DMCHA make its application in automotive interiors safer and more environmentally friendly.

4.3 Furniture Manufacturing

In furniture manufacturing, polyurethane foaming materials are used for fillings of soft furniture such as sofas and mattresses. The efficient catalytic action of DMCHA can shorten the production cycle and improve production efficiency.

5. Production and storage of DMCHA

5.1 Production process

DMCHA production 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:

  1. Cyclohexylamine reacts with formaldehyde to form N-methylcyclohexylamine:

    C6H11NH2 + HCHO ? C6H11NHCH3 + H2O

  2. N-methylcyclohexylamine reacts with formaldehyde to form N,N-dimethylcyclohexylamine:

    C6H11NHCH3 + HCHO ? C6H11N(CH3)2 + H2O

5.2 Storage conditions

Storage Conditions Requirements
Temperature Storage temperature should be kept at 0-30°C to avoid high temperatures and direct sunlight.
Humidity The storage environment should be kept dry and the relative humidity should not exceed 60%.
Container Containers with good sealing properties should be used to avoid contact with air.
Shelf life Under suitable conditions, the shelf life of DMCHA is generally 12 months.

6. Safety and environmental protection of DMCHA

6.1 Safe use

Although DMCHA is low in toxicity, the following safety matters should still be paid attention to during use:

  • Protective Measures: Operators should wear protective gloves, goggles and protective clothing to avoid direct contact.
  • Ventiation Conditions: The operating environment should maintain good ventilation to avoid inhaling steam.
  • Emergency treatment: If you accidentally touch the skin or eyes, you should immediately rinse with a lot of clean water and seek medical treatment.

6.2 Environmental performance

DMCHA has low toxicity and low volatility, making it better than traditional catalysts in environmental protection performance. It produces less waste during its production and use, and has less pollution to the environment. In addition, DMCHA has good biodegradability and can gradually decompose in the natural environment to reduce the long-term impact on the ecosystem.

7. DMCHA market prospects

With the increasing strictness of environmental protection regulations and the increasing awareness of consumers in environmental protection, the market demand for environmentally friendly polyurethane foaming catalysts continues to grow. As an efficient and environmentally friendly catalyst, DMCHA has broad market prospects. It is expected that DMCHA’s share in the polyurethane foaming catalyst market will gradually expand in the next few years and become one of the mainstream products.

8. Conclusion

N,N-dimethylcyclohexylamine (DMCHA) is an environmentally friendly polyurethane foaming catalyst, which has the characteristics of high efficiency, low toxicity and low volatility., automobiles, furniture and other fields have broad application prospects. Compared with traditional catalysts, DMCHA has obvious advantages in environmental performance, stability and catalytic efficiency. With the increase of environmental awareness and technological advancement, DMCHA will become the first choice for polyurethane foaming catalysts, promoting the sustainable development of the polyurethane industry.

Appendix: DMCHA product parameter table

parameters Value/Description
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Appearance Colorless to light yellow liquid
Boiling point 160-162°C
Density 0.85 g/cm³
Flashpoint 45°C
Solution Easy soluble in water and organic solvents
Storage temperature 0-30°C
Storage humidity Relative humidity does not exceed 60%
Shelf life 12 months

Through the detailed introduction of the above content, I believe that readers have a deeper understanding of the choice of N,N-dimethylcyclohexylamine (DMCHA) as an environmentally friendly polyurethane foaming catalyst. DMCHA not only has excellent catalytic performance, but also performs well in environmental protection and safety, and is an important direction for the development of polyurethane foaming catalysts in the future.

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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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