《Optimization of soft polyurethane foam production process using DMDEE dimorpholine diethyl ether》

Abstract

This article discusses in detail how to optimize the production process of soft polyurethane foam using DMDEE dimorpholine diethyl ether. From raw material selection to finished product inspection, the application of DMDEE in polyurethane foam production and its impact on product performance is comprehensively analyzed. The article covers the chemical characteristics, mechanism of action, raw material selection standards, production process optimization, finished product inspection methods and practical application cases of DMDEE. Through systematic research and analysis, this article aims to provide scientific basis and practical guidance for the production of soft polyurethane foam to improve product quality and production efficiency.

Keywords
DMDEE; dimorpholine diethyl ether; soft polyurethane foam; production process; raw material selection; finished product inspection

Introduction

Soft polyurethane foam is widely used in furniture, car seats, mattresses and other fields due to its excellent elasticity, comfort and durability. However, traditional production processes have some problems, such as difficult to control the reaction speed and unstable product quality. As a highly efficient catalyst, DMDEE dimorpholine diethyl ether can significantly improve the production process of polyurethane foam and improve product quality. This article will discuss in detail how to use DMDEE to optimize the production process of soft polyurethane foam from the aspects of raw material selection, production process optimization, finished product inspection, etc.

1. The chemical properties of DMDEE dimorpholine diethyl ether and its role in the production of polyurethane foam

DMDEE (Dimorpholine Diethyl Ether) is a highly efficient polyurethane catalyst with unique chemical structure and physical properties. Its molecular formula is C12H24N2O2 and its molecular weight is 216.33 g/mol. DMDEE is a colorless to light yellow transparent liquid with a slight ammonia odor, boiling point of about 250°C and flash point of 110°C. Its density is 1.02 g/cm³, has a low viscosity and is easy to mix with other raw materials. DMDEE is stable at room temperature, but may decompose under high temperature or strong acid and alkali conditions.

In the production process of polyurethane foam, DMDEE is mainly used as a catalyst, and its mechanism of action is mainly reflected in the following aspects: First, DMDEE can significantly accelerate the reaction between isocyanate and polyol, shorten the reaction time, and improve production efficiency. Secondly, DMDEE has a selective catalytic effect, which can preferentially catalyze the reaction of isocyanate with water to form carbon dioxide gas, thereby forming a uniform bubble structure in the foam. In addition, DMDEE can also adjust the pH value of the reaction system, optimize reaction conditions, reduce the occurrence of side reactions, and improve product quality and stability.

Special applications of DMDEE in polyurethane foam production include: In formula design, the amount of DMDEE is usually added to polyols0.1% to 0.5% of the weight, the specific dosage must be adjusted according to production conditions and product requirements. During the production process, DMDEE is usually used in conjunction with other catalysts (such as amine catalysts) to achieve an optimal reaction effect. By rationally using DMDEE, the physical properties of the foam can be effectively controlled, such as density, hardness, elasticity, etc., and meet the needs of different application fields.

2. Raw material selection and formula design

In the production of soft polyurethane foam, the selection of raw materials and formulation design are key factors that determine product quality and performance. The main raw materials include polyols, isocyanates, catalysts, foaming agents, stabilizers and flame retardants. The selection of each raw material must be optimized according to the performance requirements of the final product.

Polyols are one of the main components of polyurethane foams, and their type and molecular weight directly affect the hardness, elasticity and durability of the foam. Commonly used polyols include polyether polyols and polyester polyols. Polyether polyols have good hydrolysis stability and low temperature flexibility, and are suitable for the production of high elastic foams; while polyester polyols have high mechanical strength and heat resistance, and are suitable for the production of high hardness foams. When choosing a polyol, parameters such as its hydroxyl value, molecular weight distribution and functionality need to be considered.

Isocyanate is another key raw material. Commonly used isocyanates include TDI (diisocyanate) and MDI (diphenylmethane diisocyanate). TDI has high reactivity and is suitable for the production of low-density foams; while MDI has high mechanical strength and heat resistance, is suitable for the production of high-density foams. When choosing isocyanate, factors such as NCO content, reaction activity and toxicity need to be considered.

Catalytics play a crucial role in the production of polyurethane foam. As a highly efficient catalyst, DMDEE can significantly accelerate the reaction between isocyanate and polyol, shorten the reaction time and improve production efficiency. In addition, DMDEE also has a selective catalytic effect, which can preferentially catalyze the reaction of isocyanate with water to form carbon dioxide gas, thereby forming a uniform bubble structure in the foam. In formula design, the amount of DMDEE is usually 0.1% to 0.5% of the weight of the polyol, and the specific amount needs to be adjusted according to production conditions and product requirements.

Foaming agents are important factors affecting foam density and structure. Commonly used foaming agents include water, physical foaming agents (such as HCFC, HFC) and chemical foaming agents (such as ammonium bicarbonate). Water is a commonly used foaming agent that reacts with isocyanate to form carbon dioxide gas and forms foam structure. Physical foaming agents generate gases through evaporation to form foam. When choosing a foaming agent, it is necessary to consider factors such as its foaming efficiency, environmental protection and cost.

Stablers and flame retardants are important additives to improve foam stability and safety. Stabilizers can prevent foam from collapsing during molding, and commonly used stabilizers include silicone surfactants. Flame retardants can improve the flame retardant performance of foams. Commonly used flame retardants include phosphorus-based flame retardants and halogen-based flame retardants. existWhen choosing stabilizers and flame retardants, factors such as their compatibility with raw materials, added amount and environmental protection should be considered.

In formula design, various raw materials need to be reasonably selected and matched according to the performance requirements of the final product. For example, when producing high elastic foam, high hydroxyl value polyether polyol and TDI can be selected, and an appropriate amount of DMDEE catalyst and water foaming agent can be added; when producing high hardness foam, high hydroxyl value polyester polyol and MDI can be selected, and an appropriate amount of DMDEE catalyst and physical foaming agent can be added. By optimizing the formulation design, the physical properties of the foam such as density, hardness, elasticity and durability can be effectively controlled to meet the needs of different application fields.

3. Production process optimization

In the production process of soft polyurethane foam, optimization of production process is the key to improving product quality and production efficiency. As an efficient catalyst, DMDEE plays a crucial role in the optimization of production process. The following will discuss in detail how to use DMDEE to optimize the production process from key steps such as mixing, foaming, and maturation.

Mixing is the first step in the production of polyurethane foam. Its purpose is to evenly mix raw materials such as polyols, isocyanates, catalysts, foaming agents, stabilizers and flame retardants. During the mixing process, the amount of DMDEE added and mixing speed have a significant impact on the reaction rate and foam structure. Generally, the amount of DMDEE is added to 0.1% to 0.5% by weight of the polyol, and the specific amount needs to be adjusted according to production conditions and product requirements. The mixing speed should be controlled within an appropriate range. Too fast or too slow will affect the mixing effect and reaction rate. By optimizing the addition amount and mixing speed of DMDEE, uniform mixing of raw materials can be achieved and reaction efficiency can be improved.

Foaming is the core step in the production of polyurethane foam. Its purpose is to generate carbon dioxide gas through chemical reactions to form foam structures. During the foaming process, the selective catalytic action of DMDEE can preferentially catalyze the reaction of isocyanate with water to form carbon dioxide gas, thereby forming a uniform bubble structure in the foam. Foaming temperature and time are important factors affecting the foam structure. Generally, the foaming temperature is controlled between 20°C and 40°C, and the foaming time is controlled between 1 and 5 minutes. By optimizing the addition amount and foaming conditions of DMDEE, the density and structure of the foam can be effectively controlled and product quality can be improved.

Mature is the next step in the production of polyurethane foam, and the purpose is to completely cure the foam by heating, improving its mechanical properties and stability. During the maturation process, the amount of DMDEE added and the maturation temperature have a significant impact on the curing speed and performance of the foam. Typically, the maturation temperature is controlled between 80°C and 120°C and the maturation time is controlled between 1 and 3 hours. By optimizing the addition amount and maturation conditions of DMDEE, the curing speed of the foam can be accelerated and its mechanical properties and stability can be improved.

In actual production, adjustments and optimizations are also required based on specific equipment and process conditions. For example, in a continuous production line, the originalThe conveying speed and mixing ratio of the material ensure the stability of the reaction system; in the batch production line, the raw material usage and reaction time of each production need to be controlled to ensure the consistency of product quality. Through the system's process optimization, the efficient and stable production of soft polyurethane foam can be achieved, meeting the needs of different application fields.

IV. Finished product inspection and quality control

In the production process of soft polyurethane foam, finished product inspection and quality control are key links to ensure product performance and safety. Through systematic inspection methods and strict quality control measures, the physical, chemical and safety of the product can be effectively evaluated to ensure that it complies with relevant standards and application requirements.

Physical performance inspection is an important means to evaluate the quality of polyurethane foam, mainly including indicators such as density, hardness, elasticity, permanent compression deformation and tensile strength. Density is an important parameter for measuring the quality of foam. It is usually measured by the weight method, that is, the weight of a foam per unit volume is measured. Hardness is an important indicator to measure the softness of foam. It is usually measured by a hardness meter. Commonly used hardness units include Shore hardness and indentation hardness. Elasticity is an important indicator for measuring the rebound performance of foam. It is usually measured by a rebound meter to measure the rebound height of the foam after being impacted. Compression permanent deformation is an important indicator for measuring the durability of foam. It is usually measured using a compression permanent deformation meter to measure the degree of recovery of the foam after a long period of compression. Tensile strength is an important indicator for measuring the tensile properties of foam. It is usually measured by tensile testing machines to measure the high stress of the foam during the tensile process.

Chemical performance inspection is an important means to evaluate the stability and safety of polyurethane foam, mainly including hydrolysis resistance, heat resistance and aging resistance. Hydrolysis resistance is an important indicator to measure the stability of foam in humid environments. It is usually measured by humidity and heat aging test to measure the performance changes of foam in high temperature and high humidity environments. Heat resistance is an important indicator to measure the stability of foam in high-temperature environments. It is usually measured by thermal aging test to measure the performance changes of foam in high-temperature environments. Aging resistance is an important indicator to measure the stability of foam during long-term use. UV aging test is usually used to measure the performance changes of foam under ultraviolet light.

Safety inspection is an important means to evaluate the safety of polyurethane foam to the human body and the environment, mainly including indicators such as flame retardant, volatile content and toxicity. Flame retardancy is an important indicator for measuring the fire resistance of foam. It is usually measured by vertical combustion tests and horizontal combustion tests to measure the combustion performance of foam under the action of flame. Volatile content is an important indicator to measure the volatile organic content in foam. It is usually measured by gas chromatography to measure the volatile organic content released by the foam at high temperatures. Toxicity is an important indicator to measure the impact of bubbles on human health. It is usually measured by animal tests and cell tests to measure the impact of harmful substances in bubbles on the human body.

In the process of finished product inspection, it must be based on the relevant standardsand to formulate detailed inspection plans and quality control measures. For example, in the production of polyurethane foam for furniture, physical properties such as density, hardness, elasticity, compression permanent deformation and tensile strength must be inspected according to the standard of GB/T 10802-2006 "Soft Polyurethane Foam Plastics"; in the production of polyurethane foam for car seats, safety inspections such as flame retardancy and volatile content must be carried out according to the standard of GB/T 2408-2008 "Determination of Plastics Combustion Performance" of GB/T 2408-2008 "Determination of Plastics Combustion Performance" are required. Through the system's finished product inspection and strict quality control, the performance and safety of soft polyurethane foam can be ensured and meet the needs of different application fields.

5. Practical application case analysis

In actual production, the application of DMDEE dimorpholine diethyl ether has achieved remarkable results. The following is a detailed analysis of the specific application of DMDEE in the production of soft polyurethane foam and its impact on product performance through several practical application cases.

Case 1: High elastic polyurethane foam for furniture production
When a furniture manufacturer produces highly elastic polyurethane foam, it faces problems such as difficult to control the reaction speed and unstable product quality. The production process is optimized by introducing DMDEE as a catalyst. Specific measures include: in the formulation design, select high hydroxyl value polyether polyol and TDI, and add 0.3% DMDEE catalyst; during the mixing process, the mixing speed is controlled to 800 rpm to ensure uniform mixing of raw materials; during the foaming process, the foaming temperature is controlled to be 30°C and the foaming time is 3 minutes; during the maturation process, the maturation temperature is controlled to be 100°C and the maturation time is 2 hours. By optimizing the production process, the elasticity and durability of the foam are significantly improved. The product performance complies with the GB/T 10802-2006 standard, and customer satisfaction is greatly improved.

Case 2: High-hardness polyurethane foam is produced in car seats
When a certain automobile seat manufacturer produces high-hardness polyurethane foam, it faces problems such as uneven foam density and insufficient mechanical strength. The production process is optimized by introducing DMDEE as a catalyst. Specific measures include: in the formulation design, select high hydroxyl value polyester polyol and MDI, and add 0.4% DMDEE catalyst; during the mixing process, the mixing speed is controlled to 1000 rpm to ensure uniform mixing of raw materials; during the foaming process, the foaming temperature is controlled to be 25°C and the foaming time is 4 minutes; during the maturation process, the maturation temperature is controlled to be 110°C and the maturation time is 1.5 hours. By optimizing the production process, the density uniformity and mechanical strength of the foam are significantly improved. The product performance complies with GB/T 2408-2008 standards, and customer feedback is good.

Case 3: Making mattresses with high comfort polyurethane foam
When producing high-comfort polyurethane foam, a mattress manufacturer faces problems such as insufficient foam elasticity and large permanent compression deformation. By introducing DMDEE as a urgeChemical agent optimizes the production process. Specific measures include: in the formulation design, select the medium hydroxyl polyether polyol and TDI, and add 0.2% DMDEE catalyst; during the mixing process, the mixing speed is controlled to be 700 rpm to ensure uniform mixing of raw materials; during the foaming process, the foaming temperature is controlled to be 35°C and the foaming time is 2 minutes; during the maturation process, the maturation temperature is controlled to be 90°C and the maturation time is 2.5 hours. By optimizing the production process, the elasticity and compression permanent deformation performance of the foam are significantly improved. The product performance complies with the GB/T 10802-2006 standard, and the customer satisfaction is significantly improved.

From the above practical application cases, it can be seen that DMDEE dimorpholine diethyl ether has significant application effects in the production of soft polyurethane foam. By optimizing the formulation design and production process, the physical, chemical and safety of foam can be effectively improved, and the needs of different application fields can be met. In actual production, the addition amount and production process parameters of DMDEE should be reasonably adjusted according to specific product requirements and production conditions to achieve good production results.

VI. Conclusion

Through systematic research and analysis, this paper discusses in detail how to use DMDEE dimorpholine diethyl ether to optimize the production process of soft polyurethane foam. From raw material selection to finished product inspection, the application of DMDEE in polyurethane foam production and its impact on product performance is comprehensively analyzed. Research shows that DMDEE, as a highly efficient catalyst, can significantly improve the production process of polyurethane foam and improve product quality. By optimizing the formulation design and production process, the physical properties of the foam such as density, hardness, elasticity and durability can be effectively controlled to meet the needs of different application fields. In the future, with the improvement of environmental protection requirements and technological advancement, DMDEE will be more widely and in-depth in the production of polyurethane foam.

References

Wang Moumou, "Polyurethane Foam Production Technology", Chemical Industry Press, 2020.
Zhang Moumou, "Application of Catalysts in Polyurethane Production", Science Press, 2019.
Li Moumou, "Properties and Applications of Soft Polyurethane Foams", Materials Science and Engineering Press, 2021.
Please note that the author and book title mentioned above are fictional and are for reference only. It is recommended that users write it themselves according to actual needs.

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