Cardanol-based polyether polyol, and preparation method and application thereof

Abstract

The present application relates to a cardanol-based polyether polyol and its preparation method and application, and mainly solves the problems of large odor, poor air permeability and mechanical properties of polyurethane soft foam in the prior art. By using a new cardanol-based polyether polyol, the cardanol-based polyether polyol takes cardanol trimer as a starter, mixes polyethylene oxide I and propylene oxide, and continues to be capped with polyethylene oxide II, so that the prepared cardanol-based polyether polyol can be better applied in polyurethane soft foam.

Description

Technical Field

[0001] This invention relates to a cashew phenol-based polyether polyol, its preparation method, and its application. Background Technology

[0002] Polyether polyols are a class of polymers obtained by ring-opening polymerization of epoxides with initiators under the action of catalysts. Initiators for polyether polyols are low-molecular-weight compounds containing active hydrogen atoms. Different initiators result in polyether polyols with vastly different properties. Common initiators include propylene glycol, ethylene glycol, glycerol, and diethylene glycol. These common initiators are derived from petrochemical products and are non-renewable resources. With the increasing depletion of petrochemical resources, finding renewable initiators to prepare bio-based polyether polyols has become a trend in the polyether polyol industry.

[0003] Polyurethane flexible foam is widely used in automotive seats, sofas, mattresses, and other products due to its excellent resilience, lightweight, wear resistance, and comfortable feel. Currently, the polyether polyols used in polyurethane flexible foam are petroleum-based polyether polyols. However, with the scarcity of petroleum resources and the continuous rise in the price of petrochemical products, bio-based polyurethane flexible foam has high research value.

[0004] Most publicly disclosed bio-based polyether polyols use vegetable oils as raw materials. Vegetable oils contain a large amount of unsaturated fatty acid glycerides, which are formed by the combination of glycerol with unsaturated acids such as oleic acid, linoleic acid, and linolenic acid. These glycerides themselves do not contain hydroxyl groups. Generally, it is necessary to epoxidize or ozonate the unsaturated double bonds on the vegetable oil molecular chain, and then, under the action of a catalyst, hydroxylate them with compounds containing active hydrogen, such as alcohols or acids, to introduce hydroxyl structures. This process produces polyols with a certain level of functionality and relative molecular mass. The preparation process is relatively complex, and most vegetable oil polyols are used in the field of rigid polyurethane foam.

[0005] Chinese patent CN101121784B discloses a method for preparing castor oil polyether polyol. This product can be used to prepare flexible foam, but it will cause closed-cell foam.

[0006] Chinese patent CN107057052 A discloses castor oil-based polyether polyols and the polyurethane flexible foam plastics prepared therefrom, which have excellent mechanical properties. However, because castor oil contains more than 80% ricinoleic acid, the foam products have a strong odor.

[0007] He Ming et al. from the College of Science, Nanjing Forestry University, studied the application of castor oil polyether polyols in polyurethane flexible foam (Polyurethane Industry, 2009, 24(06):33-35). They found that the tensile strength, elongation, and indentation hardness of PU foams made with castor oil polyether polyols C220 and C230 with relative molecular masses of 2000 and 3000 were similar to those of H-330 polyether polyol. However, when the relative molecular mass of castor oil polyether polyols exceeded 4000, the tensile strength, elongation, and indentation hardness of PU foams decreased significantly.

[0008] To address the aforementioned problems, this invention provides a method for preparing cashew phenol-based polyether polyols, which yields bio-based polyether polyols with simple processes and ease of industrial production. These polyether polyols can be applied to the field of polyurethane flexible foams, and the resulting polyurethane flexible foams exhibit low odor, good air permeability, and excellent mechanical properties. Summary of the Invention

[0009] One of the technical problems to be solved by the present invention is that polyurethane flexible foam in the prior art has problems such as strong odor, poor air permeability and mechanical properties. The present invention provides a new cashew phenol-based polyether polyol, which can be used to prepare polyurethane flexible foam with low odor, good air permeability and mechanical properties.

[0010] The second technical problem to be solved by the present invention is to provide a method for preparing cashew phenol-based polyether polyols, which corresponds to the solution of the first technical problem.

[0011] The third technical problem to be solved by this invention is to provide an application of cashew phenol-based polyether polyol, which corresponds to solving one of the technical problems.

[0012] To solve one of the above-mentioned technical problems, the present invention adopts the following technical solution: a cashew nut phenol-based polyether polyol, wherein the structural formula of the cashew nut phenol-based polyether polyol is as follows:

[0013]

[0014] Wherein, R2 is a mixed polymer segment of ethylene oxide I and propylene oxide, and R3 is ethylene oxide II;

[0015] R1 is a saturated hydrocarbon chain containing 15 carbon atoms or an unsaturated hydrocarbon chain containing monoene, diene, or triene, with the following structure:

[0016]

[0017] In the above technical solution, preferably, the molar ratio of propylene oxide to ethylene oxide I in R2 is 0.7 to 5.5:1; and the molar ratio of ethylene oxide II in R3 to ethylene oxide I in R2 is 1:0.4 to 7.

[0018] To solve the second technical problem mentioned above, the present invention adopts the following technical solution: a method for preparing the aforementioned cashew phenol-based polyether polyol, characterized by comprising the following steps:

[0019] (1) Add the initiator cashew phenol trimer and phosphazene catalyst to a high-temperature and high-pressure reactor equipped with a stirring device; replace with nitrogen and maintain vacuum inside the reactor.

[0020] (2) Epoxy mixture is introduced into the reactor sequentially for reaction, and the reaction temperature is controlled at 85-95℃ and the reaction pressure is ≤0.45Mpa. After the addition is completed, it is matured for 2-3 hours. Ethylene oxide II is continued to be introduced at 0-0.01Mpa for end sealing, and the temperature inside the reactor is controlled at 95-105℃ and the pressure inside the reactor is controlled at ≤0.45Mpa. After the addition is completed, it is matured for 1-2 hours to obtain crude ether I.

[0021] (3) Add 2-6% water and 1.0-10‰ adsorbent to crude ether I by mass percentage, stir for 1-2 hours, dehydrate under vacuum for 3-4 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol.

[0022] In the above technical solution, preferably, the hydroxyl value of the cashew phenol-based polyether polyol is 28.05–112.2 mg KOH / g.

[0023] In the above technical solution, preferably, the initiator is cashew phenol trimer, with the following structure:

[0024]

[0025] Where R is a saturated hydrocarbon chain containing 15 carbon atoms or an unsaturated hydrocarbon chain containing monoene, diene, or triene.

[0026] In the above technical solution, preferably, the amount of the phosphazene catalyst is 0.1-0.5% of the cashew phenol trimer, the epoxy mixture and ethylene oxide II.

[0027] In the above technical solution, preferably, the epoxy mixture is obtained by mixing propylene oxide and ethylene oxide I in a mass ratio of 1:0.1 to 1.

[0028] In the above technical solution, preferably, the ethylene oxide II is 0-15% of the total mass of cashew phenol trimer, epoxy mixture and ethylene oxide II.

[0029] To solve the third technical problem mentioned above, the present invention adopts the following technical solution: the application of the aforementioned cashew phenol-based polyether polyol in polyurethane flexible foam.

[0030] In the above technical solution, preferably, the polyurethane foam material is composed of component A and component B, wherein, by weight parts, component A includes: 40-80 parts of cashew nut shell polyether polyol, 20-60 parts of polyether polyol, 0.1-0.5 parts of amine catalyst, 0.1-0.5 parts of stannous octoate catalyst, 0.5-1.5 parts of foam stabilizer, and 2-3 parts of blowing agent; component B includes 40-50 parts of isocyanate.

[0031] In the above technical solution, preferably, the foam stabilizer is selected from at least one of B-8002 or L-580.

[0032] This invention provides a cashew nut phenol-based polyether polyol, its preparation method, and its application, solving the problems of strong odor, poor air permeability, and poor mechanical properties in existing polyurethane flexible foams. It provides a novel cashew nut phenol-based polyether polyol, resulting in polyurethane flexible foams with low odor, good air permeability, and excellent mechanical properties. The polyether polyol prepared using cashew nut phenol trimer as an initiator has a rigid benzene ring structure. Due to the high cohesive energy and rigidity of the benzene ring, polyurethane foams prepared using this type of polyether polyol as the soft segment exhibit high mechanical strength. By adjusting the structure of the polyether polyol, the gelation rate during its reaction with isocyanate and the foaming rate during the reaction of the blowing agent with isocyanate are kept in balance, achieving good foam air permeability. Detailed Implementation

[0033] Table 1 Raw Material List

[0034] Raw material name Brand and Manufacturer Polyether polyol 1 CHE-307, Changhua Chemical Polyether polyol 2 CHE-330N, Changhua Chemical Catalyst A33 Evonik Catalyst Stannous Octanoate Momentive Foam stabilizer silicone oil L-580 Momentive Foam stabilizer silicone oil B-8002 Evonik TDI-80 isocyanate Covestro

[0035]

Example 1

[0036] 900g of cashew phenol trimer and 6.05g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 1950g of an epoxy mixture (975g of propylene oxide and 975g of ethylene oxide I) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 150g of ethylene oxide II was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether A.

[0037] Add 170g of water to crude ether A, stir and heat to 85℃, add 7.8g of magnesium silicate and 7.6g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol A.

[0038]

Example 2

[0039] 675g of cashew phenol trimer and 6.19g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 2025g of an epoxy mixture (1620g of propylene oxide and 405g of ethylene oxide I) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 300g of ethylene oxide II was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether B.

[0040] Add 166g of water to crude ether B, stir and heat to 85℃, add 8.1g of magnesium silicate and 8.2g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol B.

[0041]

Example 3

[0042] 540g of cashew phenol trimer CN900T and 7.38g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 2105g of an epoxy mixture (1837.5g of propylene oxide and 262.5g of ethylene oxide) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 360g of ethylene oxide was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether C.

[0043] Add 182g of water to crude ether C, stir and heat to 85℃, add 8.5g of magnesium silicate and 8.7g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol C.

[0044]

Example 4

[0045] 450g of cashew phenol trimer and 7.40g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 2100g of an epoxy mixture (1909g of propylene oxide and 191g of ethylene oxide) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 450g of ethylene oxide was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether D.

[0046] Add 178g of water to crude ether D, stir and heat to 85℃, add 8.6g of magnesium silicate and 8.8g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol D.

[0047]

Example 5

[0048] 1800g of cashew phenol trimer CN900T and 8.63g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 1000g of an epoxy mixture (600g of propylene oxide and 400g of ethylene oxide) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 200g of ethylene oxide was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether E.

[0049] Add 152g of water to crude ether E, stir and heat to 85℃, add 6.3g of magnesium silicate and 6.5g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol E.

[0050] Comparative Example 1

[0051] 558g of castor oil and 7.38g of phosphazene catalyst were added to a 5L high-temperature and high-pressure reactor equipped with a stirrer. The reactor was purged with nitrogen five times to maintain a vacuum. The reactor temperature was raised to 85℃ and dehydrated for 1 hour. Then, 2082g of an epoxy mixture (1822g of propylene oxide and 260g of ethylene oxide) was slowly and uniformly introduced at -0.01 MPa. The reactor temperature was controlled at 85-95℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 3 hours. Then, 360g of ethylene oxide was introduced at 0.01 MPa. The reactor temperature was controlled at 95-105℃ and the reactor pressure was controlled at ≤0.45 MPa. After the addition was completed, the reactor was matured for 2 hours to obtain crude ether F.

[0052] Add 182g of water to crude ether F, stir and heat to 85℃, add 8.5g of magnesium silicate and 8.7g of aluminum silicate, stir for 1.5 hours, start vacuum dehydration, and gradually raise the temperature to 115℃. Dehydrate for 3 hours until the moisture content is less than 0.1%, and filter to obtain cashew phenol-based polyether polyol F.

[0053]

Example 6

[0054] Prepare component A and component B according to the following formulas:

[0055] Component A: Cashew nut phenol-based polyether polyol A 80g, polyether polyol 120g, catalyst A-33 0.15g, stannous octoate 0.1g, silicone oil L-580 0.52g, water 2.5g

[0056] Component B: TDI-804 2.5g

[0057] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0058]

Example 7

[0059] Prepare component A and component B according to the following formulas:

[0060] Component A: Cashew nut phenol-based polyether polyol B 70g, polyether polyol 130g, catalyst A-33 0.2g, stannous octoate 0.11g, silicone oil L-580 0.25g, silicone oil B-8002 0.73g, water 2.5g

[0061] Component B: TDI-804 3.9g

[0062] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0063]

Example 8

[0064] Prepare component A and component B according to the following formulas:

[0065] Component A: Cashew nut phenol-based polyether polyol C 60g, polyether polyol 140g, catalyst A-33 0.23g, stannous octoate 0.12g, silicone oil L-580 0.23g, silicone oil B-8002 0.78g, water 2.6g

[0066] Component B: TDI-8047.5g

[0067] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0068]

Example 9

[0069] Prepare component A and component B according to the following formulas:

[0070] Component A: Cashew nut shell polyether polyol D 50g, polyether polyol 150g, catalyst A-33 0.25g, stannous octoate 0.15g, silicone oil L-580 0.20g, silicone oil B-8002 0.82g, water 2.6g

[0071] Component B: TDI-8048.2g

[0072] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0073]

Example 10

[0074] Prepare component A and component B according to the following formulas:

[0075] Component A: Cashew nut phenol-based polyether polyol E 40g, polyether polyol 260g, catalyst A-33 0.21g, stannous octoate 0.10g, silicone oil L-580 0.5g, water 3.0g.

[0076] Component B: TDI-804 2.9g

[0077] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0078] Comparative Example 2

[0079] Prepare component A and component B according to the following formulas:

[0080] Component A: Polyether polyol F 60g, polyether polyol 140g, catalyst A-330.2g, stannous octoate 0.12g, silicone oil L-5800 0.23g, silicone oil B-8002 0.78g, water 2.6g

[0081] Component B: TDI-8047.5g

[0082] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and leave it at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0083] Comparative Example 3

[0084] Prepare component A and component B according to the following formulas:

[0085] Component A: Polyether polyol 140g, Polyether polyol 260g, Catalyst A-33 0.23g, Stannous octoate 0.12g, Silicone oil L-580 0.23g, Silicone oil B-800 0.78g, Water 2.6g

[0086] Component B: TDI-8047.5g

[0087] First, mix component A in a mixer at 5000 rpm for 20-30 seconds to ensure uniform mixing. Then, mix component A and component B together for 5-8 seconds, quickly pour the mixture into a mold, and let it stand at room temperature for 48 hours to obtain bio-based polyurethane flexible foam.

[0088] Odor test method for polyether polyols: Put 100 ml of polyether polyol into a 200 ml glass bottle. Prepare two samples of the same polyether and place them in ovens at room temperature (25℃) and 80℃ respectively for 2 hours. Then, have 8 to 10 people smell the two samples of polyether every 10 minutes and give them an odor rating according to the standard in the table below. Take the average rating of each person as the final result. The odor rating standard refers to VDA270.

[0089] Table 2 Odor Test Standards for Polyether Polyols (VDA270-2018)

[0090]

[0091] Table 3 shows the physical property test indicators of the bio-based polyether polyols prepared in Examples 1-5 and Comparative Example 1.

[0092]

[0093]

[0094] Table 4 shows the properties of the polyurethane flexible foams prepared in Examples 6-10 and Comparative Examples 2-3.

[0095]

[0096] The test data from the examples and comparative examples show that the polyurethane flexible foam prepared with cashew phenol-based polyether polyol provided by the present invention can effectively improve the tensile strength, tear strength and other mechanical properties compared with the polyurethane flexible foam prepared with castor oil polyol, and can also improve air permeability and reduce foam odor. Compared with the polyurethane flexible foam prepared with petroleum-based polyether polyol, the polyurethane flexible foam prepared with cashew phenol-based polyether polyol provided by the present invention has slightly improved tensile strength, tear strength and air permeability, and can achieve the effect of replacing petroleum-based polyether polyol, achieving the goal of green environmental protection and achieving good technical results.

Claims

1. A cardanol-based polyether polyol, characterized in that, The structural formula of the cardanol trimer polyether polyol is as follows: ； R2 is a mixed polyethylene oxide I and polypropylene oxide segment, and R3 is polyethylene oxide II; R1 is a saturated hydrocarbon chain containing 15 carbon atoms or an unsaturated hydrocarbon chain containing mono-olefin, di-olefin or tri-olefin, and the structure is as follows: ； The molar ratio of polypropylene oxide to polyethylene oxide I in R2 is 0.7-5.5:1, and the molar ratio of polyethylene oxide II in R3 to polyethylene oxide I in R2 is 1:0.4-7.

2. A process for the preparation of cardanol-based polyether polyol as claimed in claim 1, characterized in that, The method comprises the following steps: (1) A high-temperature and high-pressure resistant reaction kettle equipped with a stirring device is used to put a starting agent cardanol trimer and a phosphazene catalyst, nitrogen is used for replacement and vacuum maintenance in the kettle; (2) An epoxy mixture is sequentially introduced into the reaction kettle for reaction, the reaction temperature is controlled to be 85-95℃, and the reaction pressure is controlled to be ≤0.45Mpa; after the feeding is completed, aging is performed for 2-3 hours; polyethylene oxide II is continuously introduced under 0-0.01Mpa for end-capping, the kettle temperature is controlled to be 95-105℃, and the kettle pressure is controlled to be ≤0.45Mpa; after the feeding is completed, aging is performed for 1-2 hours, and a crude ether I is obtained; (3) 2-6% of water and 1.0-10‰ of an adsorbent are added into the crude ether I in percentage of the mass of the crude ether I, stirring is performed for 1-2 hours, vacuum and pressure reduction are performed for 3-4 hours for dehydration until the water content is less than 0.1%, and suction filtration is performed to obtain a cardanol-based polyether polyol.

3. The method for preparing cashew phenol-based polyether polyol according to claim 2, characterized in that, The hydroxyl value of the cardanol-based polyether polyol is 28.05-112.2mgKOH / g; and the mass ratio of the cardanol trimer to the epoxy mixture is 1:0.5-5.

4. The method for preparing cashew phenol-based polyether polyol according to claim 2, characterized in that, The starting agent is a cardanol trimer, and the structure is as follows: 。 5. The method for preparing cashew phenol-based polyether polyol according to claim 2, characterized in that, The dosage of the phosphazene catalyst is 0.1-0.5% of the total mass of the cardanol trimer, the epoxy mixture and polyethylene oxide II.

6. Application of the cardanol-based polyether polyol in polyurethane soft foam.

7. The use of cardanol-based polyether polyol according to claim 6 in polyurethane flexible foam, characterized in that, The polyurethane soft foam is composed of component A and component B, wherein, in terms of weight parts, the component A comprises: 40-80 parts of the cardanol-based polyether polyol, 20-60 parts of a polyether polyol, 0.1-0.5 parts of an amine catalyst, 0.1-0.5 parts of a stannous octoate catalyst, 0.5-1.5 parts of a foam stabilizer and 2-3 parts of a foaming agent; and the component B comprises 40-50 parts of isocyanate.

8. The use of cardanol-based polyether polyol according to claim 7 in polyurethane flexible foam, characterized in that, The foam stabilizer is selected from at least one of B-8002 or L-580.

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