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Method for improving the durability of polyurethane coatings by N,N-dimethylcyclohexylamine

3月 11th, 2025 News

Methods for N,N-dimethylcyclohexylamine to improve the durability of polyurethane coating

Introduction

Polyurethane coatings are widely used in construction, automobile, ship, furniture and other fields due to their excellent mechanical properties, chemical resistance and weather resistance. However, with the complexity of the use environment and the extension of the use time, the durability problem of the polyurethane coating gradually emerges. To improve the durability of polyurethane coatings, researchers continue to explore new additives and modification methods. As a highly efficient catalyst and modifier, N,N-dimethylcyclohexylamine (DMCHA) has gradually attracted attention in recent years. This article will introduce in detail the mechanism of N,N-dimethylcyclohexylamine in improving the durability of polyurethane coatings, its usage methods, product parameters and practical application cases.

I. 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
       |
  N-CH3
   /
  /
 /
| |
        /
       /
      /
     /
     C

1.2 Physical Properties

Properties value
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Boiling point 160-162°C
Density 0.85 g/cm³
Flashpoint 40°C
Solution Easy soluble in organic solvents

1.3 Chemical Properties

N,N-dimethylcyclohexylamine has strong basicity and can react with acid to form salts. In addition, it also has good catalytic properties and can accelerate the reaction between isocyanate and hydroxyl groups in the polyurethane reaction.

2. The mechanism of action of N,N-dimethylcyclohexylamine in polyurethane coating

2.1 Catalysis

N,N-dimethylcyclohexylamine, as a highly efficient catalyst, can significantly accelerate the reaction between isocyanate and hydroxyl groups in the polyurethane reaction. The catalytic mechanism is as follows:

  1. Activated isocyanate: The nitrogen atom in N,N-dimethylcyclohexylamine has a lone pair of electrons and can form coordination bonds with the carbon atoms in the isocyanate to activate isocyanate.
  2. Promote reaction: Activated isocyanates are more likely to react with hydroxyl groups to form polyurethane chains.

2.2 Modification effect

N,N-dimethylcyclohexylamine not only has a catalytic effect, but also can modify the polyurethane coating by cyclohexyl groups in its molecular structure. The specific functions are as follows:

  1. Improving Crosslinking Density: N,N-dimethylcyclohexylamine can react with isocyanate groups in the polyurethane chain to form a crosslinking structure, thereby increasing the crosslinking density of the coating.
  2. Enhanced Mechanical Performance: The increase in crosslinking density significantly improves the mechanical properties of polyurethane coatings (such as hardness, wear resistance).
  3. Improving chemical resistance: The formation of crosslinked structures reduces the permeability of the polyurethane coating to chemical substances, thereby improving the chemical resistance of the coating.

III. Methods for using N,N-dimethylcyclohexylamine

3.1 Addition amount

The amount of N,N-dimethylcyclohexylamine added has a significant impact on the performance of the polyurethane coating. Generally speaking, it is more appropriate to add between 0.1% and 1.0%. The specific amount of addition should be adjusted according to the specific application environment and performance requirements of the coating.

Application Environment Recommended addition (%)
General Environment 0.1-0.3
High humidity environment 0.3-0.5
High chemical corrosion environment 0.5-1.0

3.2 Adding method

N,N-dimethylcyclohexylamine can be added to the polyurethane coating in two ways:

  1. Direct addition: Add N,N-dimethylcyclohexylamine directly to the polyurethane prepolymer, stir evenly and then coat.
  2. Premix: Premix N,N-dimethylcyclohexylamine with polyurethane prepolymer in advance to form a stable mixture before coating.

3.3 Notes

  1. Storage conditions: N,N-dimethylcyclohexylamine should be stored in a cool and dry environment to avoid contact with acids.
  2. Safe Operation: N,N-dimethylcyclohexylamine has a certain irritation. Protective gloves and masks should be worn during operation to avoid direct contact with the skin and inhalation of steam.

IV. Practical application cases of N,N-dimethylcyclohexylamine to improve the durability of polyurethane coating

4.1 Building exterior wall coating

In building exterior paints, polyurethane coatings need to have excellent weather resistance and chemical resistance. By adding N,N-dimethylcyclohexylamine, the crosslinking density of the coating can be significantly improved, thereby enhancing its weathering and chemical resistance.

Performance metrics DMCHA not added Add DMCHA (0.3%)
Weather resistance (hours) 1000 1500
Chemical resistance (grade) 3 5

4.2 Automotive Paint

Auto paints need to have excellent wear resistance and corrosion resistance. By adding N,N-dimethylcyclohexylamine, the cross-linking density of the coating can be improved, thereby enhancing its wear resistance and corrosion resistance.

Performance metrics DMCHA not added Add DMCHA (0.5%)
Abrasion resistance (times) 500 800
Corrosion resistance (grade) 4 6

4.3 Marine coating

Marine coatings need to have excellent water resistance and salt spray resistance. By adding N,N-dimethylcyclohexylamine, the cross-linking density of the coating can be improved, thereby enhancing its water resistance and resistance.Salt spray.

Performance metrics DMCHA not added Add DMCHA (0.7%)
Water resistance (hours) 500 1000
Salt spray resistance (grade) 3 5

V. Product parameters of N,N-dimethylcyclohexylamine

5.1 Product Specifications

parameters value
Appearance Colorless transparent liquid
Purity ?99%
Moisture ?0.1%
Acne ?0.1 mg KOH/g
Flashpoint 40°C
Packaging 25kg/barrel

5.2 Product Advantages

  1. High-efficiency Catalysis: N,N-dimethylcyclohexylamine has efficient catalytic properties and can significantly accelerate the polyurethane reaction.
  2. Enhanced Performance: By increasing the crosslink density, the mechanical properties and chemical resistance of the polyurethane coating are significantly enhanced.
  3. Widely used: suitable for polyurethane coatings in construction, automobiles, ships and other fields.

VI. Conclusion

N,N-dimethylcyclohexylamine, as a highly efficient catalyst and modifier, plays a significant role in improving the durability of polyurethane coatings. By reasonably adding N,N-dimethylcyclohexylamine, the crosslinking density of the polyurethane coating can be significantly improved, thereby enhancing its mechanical properties, chemical resistance and weather resistance. In practical applications, N,N-dimethylcyclohexylamine has been widely used in polyurethane coatings in the fields of construction, automobiles, ships, etc., and has achieved good results. In the future, with the deepening of research, N,N-dimethylcyclohexylamine is coated in polyurethaneThe application prospects in the layer will be broader.

7. Appendix

7.1 FAQ

Q1: How to determine the amount of N,N-dimethylcyclohexylamine added?

A1: The amount of N,N-dimethylcyclohexylamine added should be adjusted according to the specific application environment and performance requirements of the coating. Generally speaking, it is more appropriate to add between 0.1% and 1.0%.

Q2: What are the storage conditions for N,N-dimethylcyclohexylamine?

A2: N,N-dimethylcyclohexylamine should be stored in a cool and dry environment to avoid contact with acids.

Q3: What are the safe operation precautions for N,N-dimethylcyclohexylamine?

A3: N,N-dimethylcyclohexylamine has certain irritation. Protective gloves and masks should be worn during operation to avoid direct contact with the skin and inhalation of steam.

7.2 Product Parameters Table

parameters value
Appearance Colorless transparent liquid
Purity ?99%
Moisture ?0.1%
Acne ?0.1 mg KOH/g
Flashpoint 40°C
Packaging 25kg/barrel

7.3 Application Case Table

Application Fields Performance metrics DMCHA not added Add DMCHA (0.3%)
Building exterior wall coating Weather resistance (hours) 1000 1500
Building exterior wall coating Chemical resistance (grade) 3 5
Auto paint Abrasion resistance (times) 500 800
Auto paint Corrosion resistance (grade) 4 6
Ship Coating Water resistance (hours) 500 1000
Ship Coating Salt spray resistance (grade) 3 5

Through the above content, we introduce in detail the mechanism of N,N-dimethylcyclohexylamine in improving the durability of polyurethane coatings, usage methods, product parameters and practical application cases. It is hoped that this article can provide valuable reference for researchers and engineering and technical personnel in related fields.

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N,N-dimethylcyclohexylamine: Catalyst selection from a green chemical perspective

3月 11th, 2025 News

N,N-dimethylcyclohexylamine: Catalyst selection from a green chemical perspective

Introduction

In today’s chemical industry, green chemistry has become an important research direction. Green chemistry is designed to reduce or eliminate the negative impact on the environment and human health during the production and use of chemicals. N,N-dimethylcyclohexylamine (N,N-Dimethylcyclohexylamine, referred to as DMCHA) is an important organic compound and is widely used in catalysts, solvents and intermediates. This article will discuss the application of DMCHA in catalyst selection from the perspective of green chemistry, and introduce its product parameters, application fields and environmental impact in detail.

1. Basic properties of N,N-dimethylcyclohexylamine

1.1 Chemical structure

N,N-dimethylcyclohexylamine is a cyclic amine compound with its chemical structure as follows:

 CH3
       |
  C6H11-N-CH3

Where C6H11 represents cyclohexyl, N represents nitrogen atom, and CH3 represents methyl.

1.2 Physical Properties

parameters value
Molecular formula C8H17N
Molecular Weight 127.23 g/mol
Boiling point 160-162°C
Melting point -50°C
Density 0.85 g/cm³
Flashpoint 40°C
Solution Solved in water and organic solvents

1.3 Chemical Properties

DMCHA is alkaline and can react with acid to form salts. In addition, it can also participate in various organic reactions as a nucleophilic reagent, such as alkylation, acylation, etc.

2. Catalyst selection from the perspective of green chemistry

2.1 Green Chemistry Principles

The 12 principles of green chemistry include:

  1. Prevent waste production
  2. Atomic Economy
  3. Reduce the use of hazardous substances
  4. Design safer chemicals
  5. Use safer solvents and reaction conditions
  6. Improving energy efficiency
  7. Use renewable raw materials
  8. Reduce the use of derivatives
  9. Using catalysts
  10. Designing degradable chemicals
  11. Real-time analysis to prevent contamination
  12. Reduce the risk of accidents

2.2 Advantages of DMCHA as a catalyst

DMCHA has the following advantages in catalyst selection:

  1. High efficiency: DMCHA, as a catalyst, can significantly improve the reaction rate and selectivity.
  2. Environmentally friendly: DMCHA is low in toxicity and is easy to recycle and reuse after reaction.
  3. Veriofunction: DMCHA can be used in a variety of organic reactions, such as esterification, amidation, etc.

2.3 Application Example

2.3.1 Esterification reaction

In the esterification reaction, DMCHA as a catalyst can significantly increase the reaction rate and product yield. For example, reaction with the formation of ethyl ester catalysis under DMCHA:

CH3COOH + C2H5OH ? CH3COOC2H5 + H2O
Catalyzer Reaction time (h) Product yield (%)
DMCHA 2 95
Catalyzer-free 6 60

2.3.2 Amidation reaction

DMCHA also exhibits excellent catalytic properties in the amidation reaction. For example, the reaction of benzoic acid and ammonia catalyzed by DMCHA:

C6H5COOH + NH3 ? C6H5CONH2 + H2O
Catalyzer Reaction time (h) Product yield (%)
DMCHA 3 90
Catalyzer-free 8 50

3. DMCHA product parameters

3.1 Industrial DMCHA

parameters value
Purity ?99%
Appearance Colorless transparent liquid
Moisture ?0.1%
Acne ?0.1 mg KOH/g
Heavy Metal Content ?10 ppm

3.2 Pharmaceutical-grade DMCHA

parameters value
Purity ?99.5%
Appearance Colorless transparent liquid
Moisture ?0.05%
Acne ?0.05 mg KOH/g
Heavy Metal Content ?5 ppm

4. Application areas of DMCHA

4.1 Chemical Industry

DMCHA is widely used in catalysts, solvents and intermediates in the chemical industry. For example, in the production of polyurethane foams, DMCHA as a catalyst can significantly improve the reaction rate and product quality.

4.2 Pharmaceutical Industry

In the pharmaceutical industry, DMCHA is used to synthesize a variety of drug intermediates. For example, in the production of antibiotics, DMCHA can be used as a catalyst to improve the selectivity of the reaction and product yield.

4.3Agriculture

In agriculture, DMCHA is used to synthesize pesticides and herbicides. For example, in the production of herbicides, DMCHA can be used as a catalyst to increase the reaction rate and product yield.

5. Environmental Impact of DMCHA

5.1 Toxicity

DMCHA is less toxic, but may still cause irritation to the skin and eyes at high concentrations. Therefore, when using DMCHA, appropriate protective measures should be taken.

5.2 Biodegradability

DMCHA is prone to biodegradation in the environment and does not have a long-term impact on the ecosystem.

5.3 Waste treatment

DMCHA is easy to recycle and reuse after reaction, reducing waste generation. In addition, the waste disposal of DMCHA is also relatively simple and can be treated by incineration or biodegradation.

6. Conclusion

N,N-dimethylcyclohexylamine, as an important organic compound, has significant advantages in catalyst selection from the perspective of green chemistry. Its efficiency, environmental friendliness and versatility make it widely used in the chemical industry, pharmaceutical industry and agriculture. Through the rational selection and use of DMCHA, the negative impact on the environment and human health during the production and use of chemicals can be effectively reduced, and the development of green chemistry can be promoted.

Appendix

Appendix A: Synthesis method of DMCHA

DMCHA synthesis methods mainly include the following:

  1. Reaction of cyclohexylamine and formaldehyde: Cyclohexylamine and formaldehyde react under acidic conditions to form DMCHA.
  2. Cyclohexanone and di: Cyclohexanone and di react under reduced conditions to form DMCHA.
  3. Cyclohexanol and di: Cyclohexanol and di react under dehydration conditions to form DMCHA.

Appendix B: DMCHA’s safety data sheet

parameters value
Flashpoint 40°C
Spontaneous ignition temperature 250°C
Explosion Limit 1.1-7.0%
Toxicity Low toxic
Protective Measures Wear gloves and goggles

Appendix C: Storage and Transport of DMCHA

parameters value
Storage temperature 0-30°C
Storage container Stainless steel or glass container
Transportation conditions Avoid high temperatures and direct sunlight

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Polyurethane synthesis technology under catalytic action of N,N-dimethylcyclohexylamine

3月 11th, 2025 News

Polyurethane synthesis technology under catalyzed by N,N-dimethylcyclohexylamine

1. Introduction

Polyurethane (PU) is a polymer material widely used in the fields of construction, automobile, furniture, shoe materials, etc. Its excellent physical properties and chemical stability make it one of the indispensable materials in modern industry. In the synthesis of polyurethane, the selection of catalyst is crucial. N,N-dimethylcyclohexylamine (N,N-Dimethylcyclohexylamine, referred to as DMCHA) plays an important role in polyurethane synthesis as a highly efficient catalyst. This article will introduce in detail the polyurethane synthesis technology under the catalytic action of N,N-dimethylcyclohexylamine, covering reaction mechanism, process parameters, product performance and other aspects.

2. Chemical properties of N,N-dimethylcyclohexylamine

N,N-dimethylcyclohexylamine is an organic amine compound with the molecular formula C8H17N and contains cyclohexyl and two methyl substituted amino groups in the structure. Its chemical properties are as follows:

Features Value/Description
Molecular Weight 127.23 g/mol
Boiling point 159-160 °C
Density 0.85 g/cm³
Solution Easy soluble in organic solvents, slightly soluble in water
Catalytic Activity Efficient catalyzing of the reaction between isocyanate and polyol

3. Basic principles of polyurethane synthesis

The synthesis of polyurethane is mainly achieved through addition polymerization reaction between isocyanate and polyol. During the reaction, the -NCO group of isocyanate reacts with the -OH group of the polyol to form a Urethane bond, thereby forming a polymer chain. The reaction equation is as follows:

R-NCO + R'-OH ? R-NH-CO-O-R'

Under the catalytic action of N,N-dimethylcyclohexylamine, the reaction rate is significantly improved and the reaction conditions are more mild.

4. Catalytic mechanism of N,N-dimethylcyclohexylamine

N,N-dimethylcyclohexylamine as a catalyst, mainly throughThe following two ways to promote reaction:

  1. Nucleophilic Catalysis: The nitrogen atom in DMCHA has a lone pair of electrons and can form a transition state with the -NCO group of isocyanate, reduce the reaction activation energy, and accelerate the reaction.
  2. Proton Transfer: DMCHA can promote proton transfer of -OH groups in polyols, making it easier to react with isocyanates.

5. Polyurethane synthesis process

5.1 Raw material preparation

The main raw materials for polyurethane synthesis include isocyanates, polyols and catalysts. The specific raw material parameters are as follows:

Raw Materials Type Molecular Weight Function
Isocyanate MDI (Diphenylmethane diisocyanate) 250.25 g/mol Provided-NCO Group
Polyol Polyether polyol 2000-6000 g/mol Provided-OH group
Catalyzer N,N-dimethylcyclohexylamine 127.23 g/mol Accelerating the reaction

5.2 Reaction conditions

The reaction conditions of polyurethane synthesis have an important impact on the performance of the final product. The following are typical reaction conditions:

parameters value
Reaction temperature 60-80 °C
Reaction time 1-3 hours
Catalytic Dosage 0.1-0.5 wt%
Isocyanate to polyol ratio 1:1 (molar ratio)

5.3 Process flow

  1. Preparation of prepolymers: to diversifyThe alcohol and isocyanate were mixed in proportion, and the catalyst DMCHA was added, and the reaction was carried out at 60-80°C for 1-2 hours to form a prepolymer.
  2. Chain Extended Reaction: Mix the prepolymer with a chain extender (such as ethylene glycol), continue to react for 30-60 minutes to form polymer chains.
  3. Post-treatment: After the reaction is completed, post-treatment steps such as defoaming and molding are carried out to obtain the final polyurethane product.

6. Product Performance

The polyurethane catalyzed by N,N-dimethylcyclohexylamine has excellent physical properties and chemical stability. The following are typical product performance parameters:

Performance value
Tension Strength 20-40 MPa
Elongation of Break 300-600%
Hardness (Shore A) 70-90
Heat resistance 120-150 °C
Chemical resistance Good

7. Application areas

Polyurethanes catalyzed by N,N-dimethylcyclohexylamine are widely used in the following fields:

Domain Application
Architecture Insulation materials, waterproof coatings
Car Seats, dashboards, seals
Furniture Sofa, mattress
Shoe Materials Soles, insoles
Electronic Packaging material, insulation layer

8. Process Optimization

In order to improve the performance and production efficiency of polyurethane, the process can be optimized by:

  1. Catalytic Dosage Optimization: Determine the best catalyst through experimentsDosage to avoid excessive or insufficient amount.
  2. Reaction temperature control: Accurately control the reaction temperature to avoid side reactions.
  3. Raw Material Selection: Select high-purity, high-quality isocyanates and polyols to ensure stable product performance.

9. Environmental protection and safety

In the process of polyurethane synthesis, the use of N,N-dimethylcyclohexylamine requires attention to environmental protection and safety issues:

  1. Sweep gas treatment: The waste gas generated during the reaction should be effectively treated to avoid environmental pollution.
  2. Personal Protection: Operators should wear protective equipment to avoid direct contact with catalysts and reactants.
  3. Waste Treatment: Reaction waste should be treated in accordance with environmental protection requirements to avoid causing harm to the environment and the human body.

10. Conclusion

N,N-dimethylcyclohexylamine, as a highly efficient catalyst, plays an important role in polyurethane synthesis. Through reasonable process control and optimization, polyurethane products with excellent performance can be prepared and widely used in various fields. In the future, with the continuous advancement of technology, polyurethane catalyzed by N,N-dimethylcyclohexylamine will exert its unique advantages in more fields.

The above is a detailed introduction to the polyurethane synthesis technology under the catalytic action of N,N-dimethylcyclohexylamine. Through this article, readers can fully understand the principles, processes, product performance and application fields of this technology, and provide reference for actual production and application.

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