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Polyether Polyols

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What is Polyether Polyols

 

Polyether polyol (polyether for short) is a kind of synthetic oil with the largest sales volume at present. It is a linear polymer made from ethylene oxide, epoxypropane, epoxybutane and other raw materials by ring-opening homopolymerization or copolymerization under the action of catalyst. Polyether polyol is the largest producer of polyethers, with glycerinum (glycerin) as the initiator and epoxides (generally PO and EO are used together), all kinds of general polyether polyols are produced by changing the feeding way (mixed or separately added), dosage ratio, feeding order and other conditions of PO and EO.

 

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Polyether polyol is a type of polymer formed through the reaction of an initiator with an alkylene oxide, often used as a key component in the production of polyurethane foams and elastomers.

 

Beiqiao can supply rigid foam,flexbile foam,CASE polyether polyol and combined polyether polyol.

 

Benefits of Polyether Polyols

Versatility
Polyether polyols offer numerous benefits that make them an excellent choice for a wide range of applications. One of the main benefits is their versatility. This polyol can be formulated into different products with different properties, allowing manufacturers to meet specific requirements and achieve desired results.

 

Durability
Another benefit is its enhanced durability. CASE polyether polyols offer excellent wear resistance, ensuring long-lasting durability in demanding environments. This makes them suitable for applications where durability is critical, such as automotive coatings, adhesives, sealants, and elastomers. In addition

 

Flexibility
This polyol has excellent flexibility. It imparts flexibility and elasticity to the final product without compromising strength or stability. This makes it ideal for use in industries such as furniture manufacturing, which require the use of flexible foams as cushioning materials. In addition,

 

Chemical Resistance
CASE polyether polyols have good chemical resistance. It exhibits resistance to solvents and chemicals commonly found in a variety of industries. This property ensures that the final product remains intact even when exposed to harsh substances or environmental factors. In addition, due to its low viscosity and fast reactivity, this polyol helps improve processing efficiency. Manufacturers can benefit from reduced production times and increased productivity while maintaining high quality standards.

 

Types of Polyether Polyols
 
Polyoxypropylene Glycol

Polyoxypropylene glycol, also known as polypropylene glycol (PPG), is prepared in lined glass or stainless steel reactors. A mixture of starter (1,2-propanediol or dipropylene glycol) and catalyst (potassium hydroxide) is added to the catalyst vessel. Heating is conducted to 80-100°C, solvent from the catalyst is removed under vacuum to facilitate alcohol formation.The catalyst is then transferred to the reaction vessel and heated to 90-120°C. At this temperature, propylene oxide is added to maintain vessel pressure at 0.07-0.35 MPa. Propylene oxide undergoes continuous polymerization until reaching a specified molecular weight. After removing residual propylene oxide, the polyether mixture is neutralized in a neutralization vessel, filtered, refined, and stabilized to obtain the final product.

Polytetrahydrofuran Glycol

Polytetrahydrofuran glycol (PTHF), also known as polytetramethylene ether glycol (PTMEG, PTMG, PTMO), is synthesized by ring-opening polymerization of tetrahydrofuran in the presence of a cationic catalyst.Production process involves adding tetrahydrofuran to a reactor, lowering the temperature below -5°C, and adding fuming sulfuric acid catalyst under vigorous stirring. Water is added in a measured quantity while maintaining low reaction temperatures. The temperature is then raised to 70-90°C to vaporize unreacted tetrahydrofuran monomers. After settling, neutralization, filtration, and vacuum drying, polytetrahydrofuran glycol is obtained.

Tetrahydrofuran-Oxirane Copolymer Polyol

Tetrahydrofuran-oxirane copolymer polyol is produced by ring-opening copolymerization of tetrahydrofuran and propylene oxide catalyzed by Lewis acids. It undergoes processes such as neutralization, water washing, dehydration, and filtration.This copolymer polyol is less expensive than pure polytetrahydrofuran glycol (PTMG) but offers similar performance characteristics, making it particularly suitable for manufacturing cold-resistant polyurethane materials (able to withstand temperatures as low as -200°C).

Polyester Polyols

Polyester polyols are typically synthesized through the condensation reaction of dicarboxylic acids or their derivatives with glycols. Polyester polyols offer several advantageous properties, including excellent solvent resistance, superior adhesion to various substrates, and enhanced mechanical properties compared to their polyether counterparts.Generally speaking, synthetic polyesters used in the production of polyurethane are classified according to the types of carboxylic acids.

 

Application of Polyether Polyols
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Detergent Or Defoaming Agent
Polyether polyol can be used for the preparation of synthetic detergents with low foaming and high detergency, and used as the defoaming agent in paper making or fermentation industry as well as a defoaming agent to prevent air from entering the blood during the blood circulation on an artificial heart-lung machine.

 

Excipient And Emulgator
Polyether has low toxicity and is often used as drug excipient and emulsifier, which is often used in oral and nasal sprays, eye and ear drops as well as shampoos.

 

Wetting Agent
Polyether is an effective wetting agent and can be used in dyeing fabric, photographic development and electroplating acid bath. F68 is used in sugar mills to obtain more sugar due to the increased water permeability.

 

Antistatic Agent
Polyether is a useful antistatic agent, which can provide enduring electrostatic protection to synthetic fiber.

 

Dispersing Agent
Polyether is used as dispersants in emulsion coatings. It can be used as the emulsifier in the polymerization of vinyl acetate emulsion. Besides, it is a pesticide emulsifier in agriculture, a coolant and lubricant in metal cutting and grinding and a lubricant in vulcanization.

 

Demulsifier
Polyether can be used as a demulsifier for crude oil, which can effectively prevent the formation of hard scales in oil pipelines and can be used for the recovery of secondary oil.

 

Papermaking Additives
Polyether can be used as a papermaking additive, which can effectively improve the quality of coated paper. It can also be used as a bleaching agent.

 

Preparation And Application
Polyether polyol series products are mainly used in the preparation of rigid polyurethane foaming plastics, widely used in refrigerators, freezers, refrigerated vehicles, thermal baffles, piping insulation and other fields. The products produced with polyether polyol have low heat conductivity coefficient and stable size, and polyether polyol is also an important raw material for the preparation of premixed polyether polyols.

 

Key Differences Between Polyester Polyol and Polyether Polyol
 

Mechanical Properties

Polyester Polyol: Polyester polyols offer superior mechanical properties such as high tensile strength and dimensional stability. This makes them well-suited for structural applications where load-bearing capacity is essential.Polyether Polyol: Polyether polyols provide flexibility and resilience, making them ideal for applications requiring cushioning or shock absorption.

Thermal Insulation

Polyester Polyol: Polyester polyols exhibit good thermal stability, making them suitable for applications requiring insulation in environments with elevated temperatures.Polyether Polyol: Polyether polyols enhance low-temperature performance, making them ideal for applications requiring insulation in cold environments.

Moisture Resistance

Polyester Polyol: While polyester polyols generally offer lower moisture resistance compared to polyether polyols, they still find applications in environments with moderate moisture exposure. Polyether Polyol: Polyether polyols provide superior moisture resistance, making them suitable for applications exposed to high humidity or moisture ingress.

Chemical Resistance

Polyester Polyol: Polyester polyols offer better resistance to certain chemicals compared to polyether polyols. This makes them suitable for applications requiring durability against chemical exposure, such as industrial equipment enclosures or chemical processing plant insulation.Polyether Polyol: While polyether polyols may have limited chemical resistance compared to polyester polyols, they are still used in applications where chemical exposure is minimal. For instance, polyether polyols are commonly found in rigid polyurethane foam packaging materials for consumer products, providing cushioning and protection during transit.

Cost Considerations

Polyester Polyol: Polyester polyols may offer cost advantages in some cases due to their availability and production processes. For example, polyester polyols are often chosen for cost-sensitive applications such as insulating panels for affordable housing projects.Polyether Polyol: Polyether polyols are preferred for specific performance attributes despite potentially higher costs. Their unique properties make them indispensable for applications where flexibility, resilience, or low-temperature performance are critical, such as medical devices or specialty insulation products.

 

How to Choose Polyether Polyols
 

Research and Development Capabilities
Innovation drives advancements in polyurethane technology. Consider manufacturers with strong research and development (R&D) capabilities that continuously strive to improve their products and develop new formulations. Collaborating with a manufacturer at the forefront of R&D ensures access to cutting-edge technologies and solutions, giving you a competitive edge in your industry.

 

Supply Chain Reliability
Reliability of the supply chain is crucial to ensure uninterrupted production. Evaluate the manufacturer's supply chain management practices, including raw material sourcing, production capacity, and logistics capabilities. Choose a manufacturer with a robust supply chain network and contingency plans to mitigate any potential disruptions, such as raw material shortages or logistical challenges.

 

Environmental and Regulatory Compliance
Sustainability and compliance with environmental regulations are increasingly important considerations in modern manufacturing. Verify manufacturers comply with environmental standards and regulations.

 

Cost-effectiveness
While quality and performance are paramount, cost-effectiveness is also a critical factor in selecting a polyester polyol manufacturer. Compare pricing structures among different manufacturers, taking into account factors such as product quality, technical support, and customization options. Choose a manufacturer that offers competitive pricing without compromising on quality or service.

 

After-Sales Service
Choosing a polyester polyol manufacturer that offers excellent after-sales service is crucial. Look for one that provides technical support for product optimization and prompt resolution of any post-purchase issues. This ensures smooth operations and optimal performance of their polyester polyols for your applications.

 

Polyether Polyol Manufacturing Process

 

 

Step1: Selection of Initiator
The process begins with the selection of an initiator, which typically contains active hydrogen atoms. These initiators can be simple substances like water, ethylene glycol, or glycerol, or more complex polyfunctional compounds. The selection of an initiator shapes the functionality of the polyol, which subsequently affects the characteristics of the resulting polyurethane.

 

Step2: Polymerization Reaction
The core of the polyether polyol production process is the polymerization reaction. In this step, epoxide monomers (EO, PO, or a mixture of both) are added to the initiator in the presence of a catalyst. Catalysts used in this process can be alkaline substances, such as potassium hydroxide, or double metal cyanide complexes (DMC catalysts). The choice of catalyst influences the reaction rate, molecular weight distribution, and the structure of the polyol (e.g., whether it is more linear or branched).

 

Step3: Control of Reaction Conditions
The polymerization reaction is highly exothermic, requiring careful control of temperature and pressure to ensure safety and product quality. The reaction can be conducted in batch or continuous processes, with the latter being more common in industrial settings for its efficiency and consistency. Maintaining optimal conditions is crucial for achieving the desired molecular weight and polyol characteristics.

 

Step4: Addition of Monomers
The epoxide monomers can be added all at once or in a controlled manner. A controlled or gradual addition helps in managing the exotherm of the reaction and can influence the final polyol's properties, such as molecular weight and polydispersity. Too rapid an addition can lead to excessive heat, potentially causing safety issues or negatively affecting the polyol's quality.

 

Step5: Tailoring Polyol Properties
The properties of the polyether polyol can be tailored by adjusting the ratio of EO to PO in the feed, the type of initiator, the reaction conditions, and the catalyst system. Ethylene oxide introduces more hydrophilic segments into the polyol, while propylene oxide contributes to hydrophobicity and flexibility. The balance between these components allows manufacturers to produce polyols with specific properties for particular applications.

 

Step6: Termination and Post-processing
Once the desired molecular weight and functionality are achieved, the reaction is terminated, usually by deactivating or removing the catalyst. The product may then undergo further purification steps to remove residual monomers and catalyst, depending on the intended application of the polyol.

 

 
Our Factory

 

Shandong Beiqiao New Material Technology Co., Ltd.
Is a manufacturing and trading combo that provides global integrated services, focusing on the production, sales, research, and development of polyurethane.BEIQIAO is also a rapidly developing new scientific and technological enterprise dedicated to the research, processing, promotion, and sales of various other new materials,such as carbon fiber series, organic silicon series and High-end polyolefin (POE) series.Furthermore, BEIQIAO continue to increase R&D investment and constantly to launch more new material products with wider application fields, better application effects and higher performance.

 

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FAQ
 

Q: What is polyether polyol used for?

A: Polyether polyols are mainly used in PU rigid foam, soft foam, and molding foam products. The decision to use a polyether rather than polyester will depend on the final properties of the material (abrasion resistance, heat resistance, hardness, solvent resistance, shock absorption…)

Q: Is polyether polyol flammable?

A: These low molecular weight, aromatic polyester polyols find applications in rigid foam and impart low cost and excellent flammability characteristics to polyisocyanurate (PIR) board stock, and PU spray foam insulation.

Q: is the difference between polyester polyol and polyether polyol?

A: Polyester Polyol: Polyester polyols offer better resistance to certain chemicals compared to polyether polyols. This makes them suitable for applications requiring durability against chemical exposure, such as industrial equipment enclosures or chemical processing plant insulation.

Q: What are the advantages of polyether?

A: These material are hydrophilic, allowing them to be used in a moist environment. Their good wetting properties also allow gypsum casts to be made more easily. Newer polyether impression materials are slightly more flexible than the older products, making them easier to remove from the mouth.

Q: What is the byproduct of polyether?

A: There are no by-products to this setting reaction and, as such, the material is dimensionally stable; however, since the materials will take up water, the set impression should be stored dry.Polyether Polyol Companies - Top Company List. China Petrochemical Corporation. Huntsman International LLC. Purinova Sp.

Q: What are the grades of polyether polyols?

A: The PTMEG polyol grade slate consists of diol with molecular weight ranges of 210, 250, 650, 1000, 1400, 1800, 2000 and 3000. The PTMEG grades 210, 250 and 650 are liquids at room temperature. If crosslinking is desired, triols like TMP or low molecular weight PPG-triols are recommended.

Q: What is the difference between polyurethane and polyether?

A: Polyether-based polyurethane is a highly versatile material recommended for applications undergoing medium to high stress, while polyester-based polyurethane is a cost-effective material ideal for applications requiring excellent oil and abrasion resistance.

Q: Is polyether foam safe?

A: Polyurethane foam is not a toxic material. However, some environmentalists consider it a toxic material because of the addition of blowing agents and fire retardants. These additives release volatile organic compounds (VOCs) with high GWP and are harmful under certain conditions.

Q: What is another name for polyether polyol?

A: Polyether polyols may be further subdivided and classified as polyethylene oxide or polyethylene glycol (PEG), polypropylene glycol (PPG) and Polytetrahydrofuran or PTMEG. These have 2, 3 and 4 carbons respectively per oxygen atom in the repeat unit.

Q: Is polyether polyol organic or inorganic?

A: Organic compound
A polyol is an organic compound comprising multiple hydroxyl groups. The term “polyol” can have a slightly different meaning in food science and polymer chemistry. A molecule with more than two hydroxyl groups is a polyol, with three—a triol, and with four—a tetrol.

Q: How are polyether polyols made?

A: Polyether polyols are made by ring opening polymerization (ROP) of epoxides with compounds having active hydrogen atom such as ethylene glycol in presence of catalyst.

Q: What is the difference between polyether and polyester polyol?

A: Polyethers have lower glass transition temperature (Tg) and better retain their flexibility and impact resistance at low temperatures. Polyesters, meanwhile, exhibit better thermo-oxidative stability and property retention at elevated temperatures.

Q: Is polyol combustible?

A: Polyols are generally combustible. Their generally low volatility means that they are poorly flammable. Flammable and/or toxic gases are generated by the combination of these materials with alkali metals, nitrides, and strong reducing agents.

Q: Is polyether soluble in water?

A: Polyethers are ubiquitous in daily life and in chemical research. Their solubilities are very different, as is exemplified by the two most common polyethers: PEG (polyethylene glycol, [–CH2–CH2–O–]n) dissolves extremely well in water; it is infinitely soluble for n ≤ 600.

Q: What is polyether also known as?

A: Because they have hydroxyl groups at the chain ends, they are sometimes called polyether glycols. Polyethylene glycol (PEG) and polypropylene glycol are alternative names for the first two compounds.Polyols can induce dose-dependent gastrointestinal symptoms of flatulence, bloating, abdominal discomfort, and laxative effects when consumed in healthy volunteers and patients with IBS.

Q: What are the applications of polyether polyols?

A: Polyether polyols for CASE applications, the acronym for: Coatings, Adhesives, Sealants, Elastomers. Repsol Alcupol Polyols for CASE applications are present in modern coating materials or varnishes, adhesives, vehicle coatings, cables, floorings, walls, roads, etc.

Q: What are the examples of polyether polyols?

A: Polyether Polyols are made by reacting organic oxide and glycol. Main organic oxide utilized are Ethylene Oxide, Propylene Oxide, Butylene Oxide, Epichlorohydrin. Main glycols utilized are Ethylene Glycol, Propylene Glycol, Water, Glycerine, Sorbitol, Sucrose, THME.

Q: Is polyether the same as polyester?

A: Both polyester and polyether urethanes perform well at elevated temperatures, however: Polyesters withstand high temperatures longer and are more resistant to heat aging. Polyethers are much less susceptible to dynamic heat build-up.

Q: What is the byproduct of polyether?

A: There are no by-products to this setting reaction and, as such, the material is dimensionally stable; however, since the materials will take up water, the set impression should be stored dry.

Q: What are the grades of polyether polyols?

A: The PTMEG polyol grade slate consists of diol with molecular weight ranges of 210, 250, 650, 1000, 1400, 1800, 2000 and 3000. The PTMEG grades 210, 250 and 650 are liquids at room temperature. If crosslinking is desired, triols like TMP or low molecular weight PPG-triols are recommended.Polyethers were introduced in the late 1960s. The setting reaction for these materials is via cationic polymerization by opening of the reactive ethylene imine terminal rings to unite molecules with no by-product formation. These material are hydrophilic, allowing them to be used in a moist environment.

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