A method for the synthesis of a polyether polyol

Abstract

The application discloses a synthesis method of polyether polyol and belongs to the technical field of chemical synthesis of fine chemicals. The method comprises the following steps: mixing 4-n-hexyl resorcinol and a small-molecule alcohol compound, adding an inorganic alkali catalyst to perform reaction, and then performing vacuum distillation treatment; a mixture of propylene oxide and ethylene oxide is added to the system to perform reaction; after the reaction is completed, propylene oxide is introduced to perform reaction, and then ethylene oxide is introduced to perform reaction; after the reaction is completed, an acid is added to adjust the pH value, and then filtration and vacuum distillation treatment are performed to obtain the polyether polyol. The synthesis of the 4-n-hexyl resorcinol-based special polyether polyol is realized under mild conditions, the viscosity, the hydroxyl value, the average molecular weight and the HLB value can be controlled, the polyether polyol can replace the use of environmental hormone chemical substances such as nonyl phenol and octyl phenol polyoxyethylene ether, and the polyether polyol has remarkable environmental protection and application values.

Description

Technical Field

[0001] This invention relates to the field of chemical synthesis technology of fine chemicals, and more specifically, to a method for synthesizing polyether polyols. Background Technology

[0002] Typical polyether polyols obtained through reaction using compounds containing hydroxyl and amino groups, such as glycerol and ethylenediamine, as feedstocks, and propylene oxide and ethylene oxide as reactants, have wide applications in industry. After ring-opening polymerization, the methyl groups in the propylene oxide molecule are lipophilic, while the fragments in the ethylene oxide molecule are hydrophilic. Therefore, this type of product possesses both lipophilic and hydrophilic properties. By adjusting the ratio of these two compounds, the hydrophilic and lipophilic properties can be controlled to meet different application scenarios. However, the adjustment range is ultimately limited, and in some fields, it cannot meet the performance requirements of the product.

[0003] Nonylphenol and octylphenol-based polyoxyethylene ethers, which subsequently developed, are also important fine chemicals. They are frequently used as surfactants, emulsifiers, wetting agents, and defoamers, finding significant applications in pharmaceuticals, pesticides, textiles, and dyeing, bringing convenience to industrial production and daily life. These substances are typically produced by reacting nonylphenol and octylphenol with ethylene oxide to form polyoxyethylene ethers, a typical type of polyether polyol. However, with advancements in technology and increased awareness, the drawbacks of these chemicals have become increasingly apparent. Their molecular structure contains only one hydroxyl group, resulting in a functionality of 1, limiting their ability to modify molecular structures. Furthermore, nonylphenol and octylphenol-based polyoxyethylene ethers may undergo partial degradation during use, producing nonylphenol and octylphenol, which are endocrine disruptors that negatively impact the endogenous secretions of animals and humans. In recent years, the international community has paid close attention to this issue and has successively introduced corresponding laws and regulations to strictly restrict their use. Therefore, developing appropriate polyether polyol substitutes that meet both application performance requirements and environmental and safety requirements is an important research direction for high-end polyether polyol products in the near future. Summary of the Invention

[0004] The purpose of this invention is to avoid the environmental hazards of nonylphenol and octylphenol-based polyoxyethylene ethers and to provide an environmentally friendly method for synthesizing polyether polyols. Based on the structural characteristics of 4-n-hexylresorcinol raw material, the method rationally designs and controls the quantity, mixing method, and connection order of grafted propylene oxide and ethylene oxide. Using a suitable catalytic environment and steps, 4-n-hexylresorcinol-based polyether polyols are obtained. The product's molecular structure contains a feedstock-mixing segment-propylene oxide and ethylene oxide block, allowing for the control of hydrophilic and lipophilic properties. This type of product has the advantage of adjustable parameters such as viscosity, hydroxyl value, relative molecular mass, and HLB value, and has broad potential applications in surfactants, emulsifiers, and polyurethane materials, and can replace the use of endocrine disruptors such as nonylphenol and octylphenol-based polyoxyethylene ethers.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for synthesizing a polyether polyol includes the following steps:

[0007] (1) Mix 4-n-hexylresorcinol and small molecule alcohols, add an inorganic base catalyst to react, and then perform vacuum distillation.

[0008] (2) Add a mixture of propylene oxide and ethylene oxide to the system of step (1) and continue the reaction;

[0009] (3) After the reaction is complete, propylene oxide is introduced to carry out the reaction; then ethylene oxide is introduced to carry out the reaction.

[0010] (4) After the reaction is complete, acid is added to the system for neutralization, followed by filtration and vacuum distillation to obtain polyether polyol.

[0011] The present invention is further configured such that, in step (1), the small molecule alcohol compound is diethylene glycol or glycerol; the inorganic base catalyst is potassium hydroxide or sodium hydroxide; the molar ratio of 4-n-hexylresorcinol to the small molecule alcohol compound is 10:1; and the mass ratio of the sum of the masses of 4-n-hexylresorcinol and the alcohol compound to the mass of the inorganic base catalyst is (1000~1500):1.

[0012] The present invention is further configured such that, in step (1), the reaction temperature is 100~110℃ and the reaction time is 2h; the vacuum degree during vacuum distillation is 0.096MPa, the vacuum distillation time is 2h, and the vacuum distillation temperature is 90℃.

[0013] The present invention is further configured such that, in step (2), the molar ratio of propylene oxide and ethylene oxide is 5:1 to 9:1; and the molar ratio of the mixture of propylene oxide and ethylene oxide to the 4-n-hexylresorcinol added in step (1) is 6:1 to 10:1.

[0014] The present invention is further configured such that, in step (2), the reaction temperature is 120°C and the reaction time is 3h.

[0015] The present invention is further configured such that, in step (3), the molar ratio of propylene oxide to 4-n-hexylresorcinol added in step (1) is (2~4):1; the molar ratio of ethylene oxide to 4-n-hexylresorcinol added in step (1) is (2~10):1; the reaction temperature for both the addition of propylene oxide and the addition of ethylene oxide is 120℃, and the reaction time is 4h.

[0016] The present invention is further configured such that, in step (4), phosphoric acid is added to neutralize the pH value of the system to 6.5-7.5; the vacuum degree during vacuum distillation is 0.096 MPa, the time is 2 h, and the temperature is 90 °C.

[0017] The present invention is further configured such that the obtained polyether polyol is heated to 25°C. o The viscosity at C is 1645~3055 mPa.s, the hydroxyl value is 104~168 mgKOH / g, the average molecular weight is 671~1083, and the hydrophilic-lipophilic balance value is 11.5~14.6.

[0018] The beneficial effects of this invention are:

[0019] (1) Polyether polyols are prepared using the unique chemical raw material 4-n-hexylresorcinol, which is environmentally friendly, has better lipophilic effect, and can avoid the use of environmental hormones such as nonylphenol and octylphenol.

[0020] (2) A unique molecular structure design and synthesis process are adopted, especially the control of the relative content, mixing method and connection order of propylene oxide and ethylene oxide, so that the molecular structure of the product contains the feed head-mixed fragment-propylene oxide and ethylene oxide blocks, thereby achieving the regulation of hydrophilic and lipophilic properties.

[0021] (3) The obtained polyether polyol products are environmentally friendly, and their viscosity, hydroxyl value, average molecular weight and HLB value are adjustable. They have obvious dual advantages in environmental protection and performance, and have great potential for market application. Attached Figure Description

[0022] Figure 1 This is a reaction flow diagram of the polyether polyol of the present invention;

[0023] Figure 2 The image shows the 1H NMR spectrum of the polyether polyol prepared in Example 1. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The method for synthesizing polyether polyols of the present invention includes the following steps:

[0026] 4-n-hexylresorcinol and a small molecule alcohol (diethylene glycol or glycerol) were added to a high-pressure reactor (molar ratio of 4-n-hexylresorcinol to the small molecule alcohol was 10:1). An inorganic base catalyst [potassium hydroxide or sodium hydroxide; the mass ratio of the sum of the masses of 4-n-hexylresorcinol and the alcohol to the inorganic catalyst was (1000~1500):1] was added. Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 100~110℃ for 2 hours. After the reaction, the system was distilled under reduced pressure (vacuum degree 0.096MPa, time 2 hours, temperature 90℃) to remove moisture. A mixture of propylene oxide and ethylene oxide was added to the system (molar ratio of propylene oxide to ethylene oxide was 5:1~9:1). A mixture of alkylene and ethylene oxide with 4-hexylresorcinol in a molar ratio of 6:1 to 10:1 was reacted at 120°C for 3 hours. Propylene oxide (in a molar ratio of propylene oxide to 4-hexylresorcinol of 2-4):1) was then introduced into the system, and the reaction was continued at 120°C for 4 hours. Subsequently, ethylene oxide (in a molar ratio of ethylene oxide to 4-hexylresorcinol of 2-10):1) was introduced into the system, and the reaction was continued at 120°C for 4 hours. After the entire reaction was completed, phosphoric acid was added to adjust the pH of the system to 6.5-7.5. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (0.096 MPa, 2 hours, 90°C) to remove moisture and low-boiling-point small-molecule fractions, yielding the polyether polyol product. Throughout the entire reaction, the pressure inside the reactor was 0.1-0.5 MPa. Figure 1 The diagram shown is a reaction flow chart of the polyether polyol of the present invention.

[0027] Example 1

[0028] 1 mol of 4-n-hexylresorcinol and 0.1 mol of diethylene glycol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and diethylene glycol to potassium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, the system was distilled under reduced pressure (vacuum degree 0.096 MPa, distillation time 2 hours, distillation temperature 90°C) to remove moisture. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the system. The reaction mixture was subjected to a reaction at 120℃ for 3 hours. After the reaction, 2 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Subsequently, 2 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 7. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa. Figure 2 The image shows the 1H NMR spectrum of the polyether polyol prepared in this embodiment.

[0029] Example 2

[0030] 1 mol of 4-n-hexylresorcinol and 0.1 mol of diethylene glycol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and diethylene glycol to potassium hydroxide was 1500:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, the system was distilled under reduced pressure (vacuum degree 0.096 MPa, distillation time 2 hours, distillation temperature 90°C) to remove moisture. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the system. The reaction mixture was subjected to a reaction at 120℃ for 3 hours. After the reaction, 2 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Subsequently, 10 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 7. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0031] Example 3

[0032] 1 mol of 4-n-hexylresorcinol and 0.1 mol of diethylene glycol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and diethylene glycol to potassium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, vacuum distillation (0.096 MPa, 2 hours, 90°C) was performed to remove moisture from the system. Then, 5 mol of propylene oxide and 1 mol of ethylene oxide were added to the system. The mixture was reacted at 120℃ for 3 hours. After the reaction, 4 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Subsequently, 2 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. The reaction was continued. After all the above reactions were completed, phosphoric acid was added to adjust the pH of the system to 7. The mixture was filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the reaction, the pressure inside the reactor was 0.1~0.5 MPa.

[0033] Example 4

[0034] 1 mol of 4-n-hexylresorcinol and 0.1 mol of diethylene glycol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and diethylene glycol to potassium hydroxide was 1500:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90°C) was performed to remove moisture from the system. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the above system. The reaction was carried out at 120℃ for 3 hours. After the reaction, 4 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Then, 10 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 6.5. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0035] Example 5

[0036] 1 mol of 4-hexylresorcinol and 0.1 mol of glycerol were added to a high-pressure reactor, along with sodium hydroxide (the mass ratio of the sum of 4-hexylresorcinol and glycerol to sodium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, the system was distilled under reduced pressure (vacuum degree 0.096 MPa, distillation time 2 hours, distillation temperature 90°C) to remove moisture. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the system. The reaction mixture was subjected to a reaction at 120℃ for 3 hours. After the reaction, 2 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Subsequently, 2 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to adjust the pH of the system to 7. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0037] Example 6

[0038] 1 mol of 4-n-hexylresorcinol and 0.1 mol of glycerol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and glycerol to potassium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, vacuum distillation (0.096 MPa, 2 hours, 90°C) was performed to remove moisture from the system. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the above system. The reaction was carried out at 120℃ for 3 hours. After the reaction, 2 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Then, 10 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 7.5. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0039] Example 7

[0040] 1 mol of 4-n-hexylresorcinol and 0.1 mol of glycerol were added to a high-pressure reactor, along with potassium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and glycerol to potassium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, the system was distilled under reduced pressure (0.096 MPa, 2 hours, 90°C) to remove moisture. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the system. The reaction was carried out at 120℃ for 3 hours. After the reaction, 4 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Then, 2 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 7. The mixture was then filtered, and the filtered product was subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0041] Example 8

[0042] 1 mol of 4-n-hexylresorcinol and 0.1 mol of glycerol were added to a high-pressure reactor, along with sodium hydroxide (the mass ratio of the sum of 4-n-hexylresorcinol and glycerol to sodium hydroxide was 1000:1). Nitrogen gas was introduced to remove air from the system, and the reaction was carried out at 110°C for 2 hours. After the reaction, the system was distilled under reduced pressure (vacuum degree 0.096 MPa, distillation time 2 hours, distillation temperature 90°C) to remove moisture. A mixture of 5 mol of propylene oxide and 1 mol of ethylene oxide was then added to the system. The reaction was carried out at 120℃ for 3 hours. After the reaction, 4 mol of propylene oxide was introduced into the system and reacted at 120℃ for 4 hours. Subsequently, 10 mol of ethylene oxide was introduced into the system and reacted at 120℃ for 4 hours. After all the above reactions were completed, phosphoric acid was added to the system to adjust the pH to 7, followed by filtration. The filtered product was then subjected to vacuum distillation (vacuum degree 0.096 MPa, vacuum distillation time 2 hours, vacuum distillation temperature 90℃) to remove water and low-boiling-point small molecule fractions, obtaining the polyether polyol product. Throughout the entire reaction process, the pressure inside the reactor was 0.1~0.5 MPa.

[0043] Table 1 shows the analytical and testing results of the products obtained in Examples 1-8. It can be seen that the present invention has achieved the controllable synthesis of 4-n-hexylresorcinol-based special polyether polyols.

[0044] The hydroxyl value was tested according to GB / T 12008.3-2009 "Plastic Polyether Polyols Part 3: Determination of Hydroxyl Value"; the viscosity was tested according to Method A of GB / T 12008.7-2010 "Plastic Polyether Polyols Part 7: Determination of Viscosity"; the molecular weight distribution was detected by gel permeation chromatography (GPC); and the HLB value was determined by the spreading coefficient method.

[0045] Table 1

[0046]

[0047] Comparative Example 1

[0048] The operation steps are the same as in Example 1, except that in step (1), 4-n-hexylresorcinol is replaced with resorcinol in equimolar amounts.

[0049] Comparative Example 2

[0050] The operation steps are the same as in Example 1, except that in step (2), 7 mol of propylene oxide and 3 mol of ethylene oxide are used; and the treatment in step (3) is not performed.

[0051] Comparative Example 3

[0052] The operation steps are the same as in Example 1, except that step (2) is not performed; in step (3), 7 mol of propylene oxide and 3 mol of ethylene oxide are used.

[0053] Comparative Example 4

[0054] The operation steps are the same as in Example 1, except that in step (3), 2 mol of ethylene oxide is introduced first, followed by 2 mol of propylene oxide.

[0055] The products of Comparative Examples 1 to 4 were analyzed and tested, and the test results are shown in Table 2.

[0056] Table 2

[0057]

[0058] The polyether polyols prepared in Example 1 and Comparative Examples 1 to 4 were subjected to degradation performance tests. The test method was as follows: the prepared polyether polyols were buried in soil (controlled at 25°C), and the degradation rate was measured after 90 days (the degradation rate was calculated by the change in weight before and after the test). The test results are shown in Table 3.

[0059] Table 3

[0060]

[0061] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for synthesizing polyether polyols, characterized in that, Includes the following steps: (1) Mix 4-n-hexylresorcinol and small molecule alcohols, add an inorganic base catalyst to react, and then perform vacuum distillation. (2) Add a mixture of propylene oxide and ethylene oxide to the system of step (1) and continue the reaction; the molar ratio of propylene oxide and ethylene oxide is 5:1 to 9:1; the molar ratio of the mixture of propylene oxide and ethylene oxide to the 4-n-hexylresorcinol added in step (1) is 6:1 to 10:

1. (3) After the reaction is completed, propylene oxide is introduced to carry out the reaction; then ethylene oxide is introduced to carry out the reaction; the molar ratio of propylene oxide to 4-n-hexylresorcinol added in step (1) is (2~4):1; the molar ratio of ethylene oxide to 4-n-hexylresorcinol added in step (1) is (2~10):1; (4) After the reaction is complete, acid is added to the system for neutralization, followed by filtration and vacuum distillation to obtain polyether polyol.

2. The method for synthesizing a polyether polyol according to claim 1, characterized in that, In step (1), the small molecule alcohol is diethylene glycol or glycerol; the inorganic base catalyst is potassium hydroxide or sodium hydroxide; the molar ratio of 4-hexylresorcinol to the small molecule alcohol is 10:1; the mass ratio of the sum of the masses of 4-hexylresorcinol and the alcohol to the mass of the inorganic base catalyst is (1000~1500):

1.

3. The method for synthesizing a polyether polyol according to claim 1, characterized in that, In step (1), the reaction temperature is 100~110℃ and the reaction time is 2h; the vacuum degree during vacuum distillation is 0.096MPa, the vacuum distillation time is 2h, and the vacuum distillation temperature is 90℃.

4. The method for synthesizing a polyether polyol according to claim 1, characterized in that, In step (2), the reaction temperature is 120℃ and the reaction time is 3h.

5. The method for synthesizing a polyether polyol according to claim 1, characterized in that, In step (3), the reaction of adding propylene oxide and adding ethylene oxide was carried out at a temperature of 120°C for 4 hours.

6. The method for synthesizing a polyether polyol according to claim 1, characterized in that, In step (4), phosphoric acid is added to neutralize the pH of the system to 6.5-7.5; the vacuum degree during vacuum distillation is 0.096 MPa, the time is 2 h, and the temperature is 90 °C.

7. The method for synthesizing a polyether polyol according to claim 1, characterized in that, The resulting polyether polyol at 25 o The viscosity at C is 1645~3055 mPa.s, the hydroxyl value is 104~168 mgKOH / g, the average molecular weight is 671~1083, and the hydrophilic-lipophilic balance value is 11.5~14.6.

Images