Hydroxyl composition for preparing bio-based polyurethanes and bio-based polyurethanes

Abstract

This application provides a hydroxyl composition for preparing a bio-based polyurethane, and the bio-based polyurethane. The hydroxyl composition comprises a combination of a vegetable oil polyol, a bio-based polyol, and a chain extender, the bio-based polyol comprising a bio-based polyether polyol and / or a bio-based polyester polyol, and the polymerizable monomers of the bio-based polyester polyol comprise a dimer acid and a dibasic acid other than a dimer acid. By combining the two polyols within a specific range, the resulting hydroxyl composition is more suitable as the A component of a two-component bio-based polyurethane. When combined with the B component, the synthesized bio-based polyurethane exhibits both excellent low-temperature folding resistance and high peel strength.

Description

[Technical Field]

[0001] The present application belongs to the technical field of polyurethane synthetic leather, such as a hydroxyl composition for preparing bio-based polyurethane and bio-based polyurethane. [Background technology]

[0002] In recent years, the polyurethane synthetic leather industry has been undergoing a transformation and upgrading, transforming from traditional environmentally unfriendly production techniques to more advanced environmentally friendly production techniques.Due to the high content of organic solvents used in traditional polyurethane synthetic leather production techniques, new national and industry policies, downstream customer requirements, and market demands all impose different restrictions on the organic solvents used in polyurethane synthetic leather.

[0003] Currently, environmentally friendly processing technologies for polyurethane synthetic leather mainly focus on water-based and solvent-free technologies. However, the raw materials are still mainly derived from petroleum-based materials. This is mainly due to the fact that, as a type of polymer material, polyurethane synthetic leather has high requirements for both function and performance. However, compared with petroleum-based materials, bio-based materials have relatively poor stability and poor structural control. When used in polyurethane synthetic leather, there are several challenges to be overcome: 1) the bonding between general bio-based materials and polyurethane materials is poor, making it difficult to improve the compatibility between the two; 2) the physical properties of most bio-based resin materials, such as abrasion resistance, scratch resistance, and hydrolysis resistance, are poor, so the durability of synthetic leather materials based on bio-based polyurethane resins needs to be improved; and 3) the toughness and strength of bio-based base fabrics are poor, which significantly affects the mechanical performance of polyurethane synthetic leather and limits its use.

[0004] CN111732711A discloses a method for preparing and using a bio-modified polyurethane resin, which involves first preparing a bio-modified half ester, then preparing a bio-modified isocyanate (B) component and an aqueous bio-modified high-solids polyol (A) component, and then fully reacting the aqueous bio-modified high-solids polyol (A) component with the bio-modified isocyanate (B) component to produce the bio-modified polyurethane resin. The invention also discloses the use of the bio-modified polyurethane resin, primarily for bonding the aqueous polyurethane resin surface layer and the solvent-free polyurethane resin intermediate layer in aqueous, solvent-free polyurethane synthetic leather. This improves the bonding ability between the aqueous polyurethane resin surface layer and the solvent-free polyurethane resin intermediate layer, avoiding quality issues such as temporary adhesion and peeling at the interface between the two due to insufficient adhesive strength, and ensuring the physical performance of the aqueous, solvent-free polyurethane synthetic leather product. The above invention effectively solves the problem of low adhesive strength present in bio-based modified polyurethane resins, but the low-temperature resistance of the resins is poor, and the resulting synthetic leathers have poor low-temperature folding resistance, failing to combine high peel strength with excellent low-temperature resistance.

[0005] Therefore, a hydroxyl composition is developed so that the bio-based polyurethane prepared with the hydroxyl composition has high peel strength and excellent low-temperature folding resistance. Summary of the Invention [Problem to be solved by the invention]

[0006] The following is a summary of the subject matter described in detail herein. This summary does not limit the scope of the claims.

[0007] In response to the deficiencies of the related art, the present application aims to provide a hydroxyl composition for preparing a bio-based polyurethane and a bio-based polyurethane, wherein the bio-based polyurethane prepared with the hydroxyl composition has excellent low-temperature resistance, and further, the synthetic leather containing the bio-based polyurethane has both excellent low-temperature folding resistance and high peel strength. [Means for solving the problem]

[0008] To achieve this objective, the present application provides the following technical solutions.

[0009] In aspect 1, the present embodiment comprises: In parts by weight, 10 to 30 parts by weight of vegetable oil polyol; 15 to 80 parts by weight of bio-based polyol; and 3 to 10 parts by weight of a chain extender, the bio-based polyol comprises a bio-based polyether polyol and / or a bio-based polyester polyol; The polymerizable monomer of the bio-based polyester polyol includes a dimer acid and a dibasic acid other than a dimer acid. A hydroxylic composition for preparing a bio-based polyurethane is provided.

[0010] Here, the vegetable oil polyol may be 12 parts by weight, 14 parts by weight, 16 parts by weight, 18 parts by weight, 20 parts by weight, 22 parts by weight, 24 parts by weight, 26 parts by weight, or 28 parts by weight, etc.

[0011] The bio-based polyol may be 20 parts by weight, 30 parts by weight, 40 parts by weight, 50 parts by weight, 60 parts by weight, or 70 parts by weight, etc.

[0012] The chain extender may be 4 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, etc.

[0013] The hydroxyl composition for preparing the bio-based polyurethane according to the embodiments of the present application comprises a combination of a vegetable oil polyol, a bio-based polyol, and a chain extender. The bio-based polyol is limited to a bio-based polyether polyol and / or a bio-based polyester polyol. The polymerizable monomers of the bio-based polyester polyol are further limited to a dimer acid and a dibasic acid other than a dimer acid. This makes the resulting hydroxyl composition more suitable as the A component of a two-component bio-based polyurethane. When combined with the B component, the resulting bio-based polyurethane has excellent low-temperature resistance. Furthermore, synthetic leather containing the bio-based polyurethane can have both excellent low-temperature folding resistance and high peel strength.

[0014] In one embodiment, the vegetable oil polyol comprises any one or a combination of at least two of castor oil polyol, soybean oil polyol, or palm oil polyol.

[0015] In one embodiment, the vegetable oil polyol further comprises a modified product thereof, the modified product being modified with one or a combination of at least two of a low molecular weight diol, a low molecular weight polyether diol, or a low molecular weight epoxy material, the purpose of which is to increase the reactivity or compatibility of the vegetable oil polyol.

[0016] In one embodiment, the low molecular weight diol is ethylene glycol and / or propylene glycol.

[0017] In one embodiment, the bio-based polyether polyol comprises bio-based polytrimethylene ether glycol.

[0018] In one embodiment, the preparation monomers for the bio-based polyester polyol further include a bio-based diol.

[0019] In one embodiment, the bio-based diol comprises bio-based 1,3-propylene glycol and / or bio-based 1,4-butanediol, more preferably bio-based 1,3-propylene glycol.

[0020] In one embodiment, the dibasic acid other than the dimer acid includes bio-based succinic acid and / or bio-based sebacic acid.

[0021] In one embodiment, the chain extender comprises a C2 to C12 (eg, C4, C6, C8, C10, or C12, etc.) low molecular weight diol.

[0022] In one embodiment, the C2 to C12 low molecular weight diol includes any one or a combination of at least two of ethylene glycol, propylene glycol, butanediol, or hexanediol.

[0023] In one embodiment, the hydroxylic composition further comprises a non-bio-based polyether polyol.

[0024] In one embodiment, the content of the non-bio-based polyether polyol in the hydroxyl composition is 0 to 70 parts by weight, and is not equal to 0, such as 10 parts by weight, 20 parts by weight, 30 parts by weight, 40 parts by weight, 50 parts by weight, or 60 parts by weight.

[0025] In aspect 2, the present embodiment comprises: mixing a vegetable oil polyol, a bio-based polyol, a chain extender, and an optional non-bio-based polyester polyol to obtain said hydroxyl compound; A method for preparing the hydroxyl compound according to embodiment 1 is provided.

[0026] In aspect 3, the present embodiment comprises: The raw materials for preparing the bio-based polyurethane include component A and component B, The component A comprises the hydroxyl compound according to aspect 1; The B component comprises a bio-based polyurethane prepolymer. The present invention provides bio-based polyurethanes.

[0027] In a preferred technical solution of the present embodiment, the bio-based polyurethane prepolymer is prepared from polyisocyanate and bio-based polyol.

[0028] In one embodiment, the polyisocyanate includes MDI and / or carbodiimide-uretonimine modified MDI.

[0029] In one embodiment, the content of NCO groups in the bio-based polyurethane prepolymer is 15-25% by weight, such as 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, or 24%.

[0030] In one embodiment, the mass ratio of the A component to the B component is 100:(50-150), for example, 100:60, 100:70, 100:80, 100:90, 100:100, 100:110, 100:120, 100:130, or 100:140.

[0031] In one embodiment, the component A further comprises one or a combination of at least two of silicone oil, a leveling aid, or water.

[0032] In one embodiment, the A component is obtained by mixing a hydroxylic composition, an optional silicone oil, an optional leveling aid, and an optional water.

[0033] In one embodiment, the bio-based polyurethane preparation raw materials further comprise a catalyst component.

[0034] In one embodiment, the catalyst component comprises an organobismuth catalyst and / or an organotin catalyst.

[0035] In one embodiment, the weight of the catalyst component is 0.025 to 1%, for example, 0.05%, 0.1%, 0.15%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, or 0.9%, based on the weight of the component A being 100%.

[0036] In aspect 4, the present embodiment comprises: comprising the bio-based polyurethane of embodiment 3; Provide synthetic leather.

[0037] In aspect 5, the present embodiment comprises: Step (1) of mixing component A with an optional catalyst component, adding component B and mixing to obtain a coating solution; and step (2) of applying the coating liquid obtained in step (1) to the surface layer, reacting it, bonding the base fabric, and curing it to obtain the synthetic leather. A method for preparing the synthetic leather of embodiment 4 is provided.

[0038] In one embodiment, the reaction temperature in step (2) is 80 to 130°C, such as 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, or 125°C.

[0039] In one embodiment, the curing temperature in step (2) is 100 to 160°C, such as 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, or 155°C.

[0040] In step (2) of the preparation method according to the examples of the present application, after the coating liquid is applied to the surface layer, the A and B components in the coating liquid are reacted and foamed at 80 to 130°C, and when the viscosity reaches its maximum, the base fabric can be bonded to the coating liquid. After that, the coating liquid is cured and molded at 100 to 160°C. [Effects of the Invention]

[0041] Compared to the related art, the present application has the following beneficial effects:

[0042] (1) The hydroxyl composition for preparing bio-based polyurethane according to the present invention comprises a combination of a vegetable oil polyol, a bio-based polyol, and a chain extender. The bio-based polyol is limited to a bio-based polyether polyol and / or a bio-based polyester polyol. The polymerizable monomers of the bio-based polyester polyol are further limited to a dimer acid and a dibasic acid other than a dimer acid. This makes the resulting hydroxyl composition more suitable as component A of a two-component bio-based polyurethane. When combined with component B, the resulting bio-based polyurethane has excellent low-temperature resistance. Furthermore, synthetic leather prepared with the bio-based polyurethane has both excellent low-temperature folding resistance and high peel strength, solving the problem in related art that two-component bio-based polyurethanes cannot have both high peel strength and excellent low-temperature folding resistance.

[0043] (2) All synthetic leathers prepared using the bio-based polyurethane of the present invention have been tested for low-temperature folding resistance at -20°C, reaching 20,000 cycles, with a peel strength of 52 N or more, and require a maturation time of 3 to 4 minutes. This means that the synthesized bio-based polyurethane of the present invention can combine excellent low-temperature folding resistance with high peel strength. DETAILED DESCRIPTION OF THE INVENTION

[0044] The technical solution of the present application will be further described below through specific embodiments. Those skilled in the art should understand that the above examples are only for understanding the present application and should not be considered as specifically limiting the present application.

[0045] Detailed information on the raw materials according to the specific embodiment of the present application is as follows: Castor oil polyol: First-grade refined castor oil from Guangzhou Chenshi Chemical Co., Ltd. Palm oil polyol: Maskimi (Malaysia), product number PKF 3000 Bio-based polyester polyol 1: Obtained by polymerizing dimer acid and bio-based succinic acid in a mass ratio of 1:1, with a molecular weight of 2000, with propylene glycol. Bio-based polyester polyol 2: Obtained by polymerizing dimer acid and bio-based sebacic acid in a 1:1 mass ratio with a molecular weight of 2000 with propylene glycol. Bio-based polyester polyol 3: Molecular weight 2000, obtained by polymerizing bio-based succinic acid and propylene glycol. Bio-based polyester polyol 4: Molecular weight 2000, obtained by polymerizing dimer acid and propylene glycol. Bio-based polyester polyol 5: Molecular weight 2000, obtained by polymerizing bio-based succinic acid, bio-based sebacic acid, and propylene glycol in a mass ratio of 1:1. Bio-based polyether polyol: Bio-based polytrimethylene ether glycol, molecular weight 2000. Non-biobased polyether polyol: KPX Chemical Co., KE-825. Diisocyanate: Wanhua Chemical MDI. Carbodiimide-uretonimine modified MDI: Wanhua MDI-100HL. Leveling silicone oil: BYK-9565. Foam-regulating silicone oil: Momentive, L-417.

[0046] Example 1 It was a bio-based polyurethane, and its preparation raw materials contained component A and component B in a mass ratio of 100:66, and further contained a catalyst component, with the total amount of component A added being 100% and the amount of catalyst component added being 0.25%.

[0047] Here, component A is, in parts by weight, 20 parts by weight of castor oil polyol, 140 parts by weight of bio-based polyester polyol; 35 parts by weight of non-bio-based polyether polyol; 5 parts by weight of 1,3-propylene glycol, 1 part by weight of leveling silicone oil, 1 part by weight of foam-regulating silicone oil, 0.5 parts by weight of water, It included.

[0048] The preparation method of the component A included mixing castor oil polyol, bio-based polyester polyol 1, non-bio-based polyether polyol, 1,3-propylene glycol, leveling silicone oil, foam-regulating silicone oil and water to obtain the component A.

[0049] The B component was a bio-based polyurethane prepolymer, in which the NCO group content was 20% by weight.

[0050] The preparation method of the component B included reacting 35 parts by weight of bio-based polyester polyol 1, 55 parts by weight of MDI, and 10 parts by weight of carbodiimide-uretonimine-modified MDI at 70°C under nitrogen gas protection for 3.5 hours to obtain the component B.

[0051] The catalyst components included 0.05 parts by weight of bismuth neodecanoate and 0.2 parts by weight of zinc neodecanoate.

[0052] Example 2 It was a bio-based polyurethane, and its preparation raw materials contained component A and component B in a mass ratio of 100:100, and further contained a catalyst component, with the total amount of component A added being 100% and the amount of catalyst component added being 0.25%.

[0053] Here, component A is, in parts by weight, 10 parts by weight of palm oil polyol; 20 parts by weight of bio-based polyether polyol; 5 parts by weight of 1,3-propylene glycol, It included.

[0054] The preparation method of the A component included mixing palm oil polyol, bio-based polyether polyol and 1,3-propylene glycol to obtain the A component.

[0055] The B component was a bio-based polyurethane prepolymer, in which the NCO group content was 20% by weight.

[0056] The preparation method of the component B included reacting 5 parts by weight of castor oil polyol, 30.5 parts by weight of bio-based polyether polyol, 54.5 parts by weight of MDI, and 10 parts by weight of carbodiimide-uretonimine modified MDI at 70°C under nitrogen gas protection for 3.5 hours to obtain the component B.

[0057] The catalyst components included 0.05 parts by weight of bismuth neodecanoate and 0.2 parts by weight of zinc neodecanoate.

[0058] Example 3 It was a bio-based polyurethane, and its preparation raw materials contained component A and component B in a mass ratio of 100:60, and further contained a catalyst component, with the total amount of component A added being 100% and the amount of catalyst component added being 0.25%.

[0059] Here, component A is, in parts by weight, 30 parts by weight of castor oil polyol, 180 parts by weight of bio-based polyester polyol; 70 parts by weight of non-bio-based polyether polyol; 10 parts by weight of 1,3-propylene glycol, 1 part by weight of leveling silicone oil, 1 part by weight of foam-regulating silicone oil, 0.5 parts by weight of water, It included.

[0060] The preparation method of the component A included mixing castor oil polyol, bio-based polyester polyol 1, non-bio-based polyether polyol, 1,3-propylene glycol, leveling silicone oil, foam-regulating silicone oil and water to obtain the component A.

[0061] The B component was a bio-based polyurethane prepolymer, in which the NCO group content was 20% by weight.

[0062] The preparation method of the component B included reacting 35 parts by weight of bio-based polyester polyol 1, 55 parts by weight of MDI, and 10 parts by weight of carbodiimide-uretonimine-modified MDI at 70°C under nitrogen gas protection for 3.5 hours to obtain the component B.

[0063] The catalyst components included 0.05 parts by weight of bismuth neodecanoate and 0.2 parts by weight of zinc neodecanoate.

[0064] Example 4 This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyether polyol was used instead of bio-based polyester polyol 1 in components A and B; the other components, amounts used, and preparation method were all the same as in Example 1.

[0065] Example 5 This is a bio-based polyurethane, and the only difference from Example 1 is that no non-bio-based polyether polyol was added; the other components, amounts used, and preparation method were all the same as in Example 1.

[0066] Example 6 This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyester polyol 2 was used instead of bio-based polyester polyol 1 in components A and B; the other components, amounts used, and preparation method were all the same as in Example 1.

[0067] (Comparative Example 1) This is a bio-based polyurethane, and the only difference from Example 1 is that the amount of bio-based polyester polyol 1 added in component A was 10 parts by weight; the other components, amounts used, and preparation method were all the same as in Example 1.

[0068] (Comparative Example 2) This is a bio-based polyurethane, and the only difference from Example 1 is that the amount of bio-based polyester polyol 1 added in component A was 90 parts by weight; the other components, amounts used, and preparation method were all the same as in Example 1.

[0069] (Comparative Example 3) This is a bio-based polyurethane, and the only difference from Example 1 is that KPX Chemical GP-1000 (trifunctional, 1000 molecular weight) was used instead of castor oil polyol; the other ingredients, amounts used, and preparation method were all the same as in Example 1.

[0070] Comparative Example 4 This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyester polyol 3 was used instead of bio-based polyester polyol 1 in components A and B; the other components, amounts used, and preparation method were all the same as in Example 1.

[0071] (Comparative Example 5) This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyester polyol 4 was used instead of bio-based polyester polyol 1 in components A and B; the other components, amounts used, and preparation method were all the same as in Example 1.

[0072] (Comparative Example 6) This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyester polyol 5 was used instead of bio-based polyester polyol 1 in components A and B; the other components, amounts used, and preparation method were all the same as in Example 1.

[0073] (Comparative Example 7) This is a bio-based polyurethane, and the only difference from Example 1 is that castor oil polyol was not added to component A; the other components, amounts used, and preparation method were all the same as in Example 1.

[0074] (Comparative Example 8) This is a bio-based polyurethane, and the only difference from Example 1 is that bio-based polyester polyol 1 was not added to component A; the other components, amounts used, and preparation method were all the same as in Example 1.

[0075] (Application example 1) It is synthetic leather, the preparation method of which includes the following steps:

[0076] (1) Component A and catalyst component in the bio-based polyurethane of Example 1 were stirred for 1 minute, then component B was added and mixed at room temperature for 15 seconds to obtain a coating liquid.

[0077] (2) The coating solution obtained in step (1) was uniformly applied to the Huafon water-based polyurethane surface layer JF-PDY-851HY, and then reacted at 100°C to foam it. When the viscosity reached its maximum, the base fabric was attached to it, and the mixture was cured at 150°C to obtain the synthetic leather.

[0078] (Application Examples 2 to 6) This is synthetic leather, and the only difference from Application Example 1 is that the A component, B component, and catalyst component of the bio-based polyurethane of Example 1 were replaced with the A component, B component, and catalyst component of the bio-based polyurethane of Examples 2 to 6, respectively; all other conditions and steps were the same as those of Application Example 1.

[0079] (Comparative Application Examples 1 to 8) This is synthetic leather, and the only difference from Application Example 1 is that the A component, B component, and catalyst component in the bio-based polyurethane of Example 1 were replaced with the A component, B component, and catalyst component in the bio-based polyurethane of Comparative Examples 1 to 8, respectively; all other conditions and steps were the same as in Application Example 1.

[0080] Performance test: (1) Peel strength: Tested according to GB / T 1040.3-2006 standard. (2) Low-temperature folding resistance: The test was conducted according to the QB / T 2714-2005 standard, and the low-temperature was set at -20°C. (3) Aging time: The minimum curing time required at 150°C was calculated when preparing the synthetic leather samples.

[0081] The synthetic leathers obtained in Application Examples 1 to 6 and Comparative Application Examples 1 to 8 were tested according to the above test methods, and the test results are shown in Table 1.

[0082] [Table 1]

[0083] The data in Table 1 reveal the following:

[0084] As can be seen from the data for Application Examples 1 to 6, synthetic leathers prepared using bio-based polyurethanes prepared within the blending ratio range of the present application all achieved 20,000 cycles in the -20°C low-temperature folding endurance test, a peel strength of 52 N or more, and a maturation time of 3 to 4 minutes. This demonstrates that the bio-based polyurethanes synthesized according to the present application can combine excellent low-temperature folding endurance with high peel strength.

[0085] By comparing the data of Application Example 1 with those of Comparative Application Examples 1, 5, and 8, it was found that the peel strength of the final synthetic leather was reduced when the content of bio-based polyester polyol was too low (Comparative Application Example 1), when a simple dimer acid polyester polyol was used (Comparative Application Example 5), and when no bio-based polyester polyol was added (Comparative Application Example 8).

[0086] Comparing the data of Application Example 1 and Comparative Application Example 2, it was found that when the content of bio-based polyester polyol was too high, the low-temperature folding resistance of the final synthetic leather was reduced.

[0087] By comparing the data of Application Example 1 with those of Comparative Application Examples 4 and 6, it was also found that the polyester polyol containing no dimer acid also deteriorated the low-temperature folding resistance of the final synthetic leather.

[0088] As can be seen from the data of Application Example 1 and Comparative Application Example 3, the low-temperature folding endurance and peel strength of the synthetic leather prepared by replacing the castor oil polyol with a general polyether polyol having similar functionality and molecular weight were both significantly reduced.

[0089] Furthermore, the data from Application Example 1 and Comparative Application Example 7 also showed that when vegetable oil polyol was not added, the degree of crosslinking in the system was insufficient and normal curing was not possible.

[0090] Finally, the data from Application Examples 1 and 5 also showed that not adding non-bio-based polyether polyol also affected the low-temperature folding resistance of the final synthetic leather.

[0091] Although the present application has described the hydroxyl composition for preparing bio-based polyurethane and the bio-based polyurethane through the above examples, the applicant declares that the present application is not limited to the above examples, i.e., it does not mean that the present application must be carried out depending on the above examples. Those skilled in the art should understand that any improvements to the present application, equivalent replacement of each raw material of the product of the present application, addition of auxiliary components, selection of specific forms, etc., are all within the protection scope and disclosure scope of the present application.

Claims

1. In parts by weight, 10 to 30 parts by weight of vegetable oil polyol; 15 to 80 parts by weight of bio-based polyol; and 3 to 10 parts by weight of a chain extender, the bio-based polyol comprises a bio-based polyether polyol and / or a bio-based polyester polyol; The polymerizable monomer of the bio-based polyester polyol includes a dimer acid and a dibasic acid other than a dimer acid. Hydroxyl compositions for preparing bio-based polyurethanes.

2. The vegetable oil polyol includes any one or a combination of at least two of castor oil polyol, soybean oil polyol, and palm oil polyol. The hydroxylic composition of claim 1.

3. The vegetable oil polyol further includes a modified product thereof, and the modified product is modified with any one or a combination of at least two of a low molecular weight diol, a low molecular weight polyether diol, or a low molecular weight epoxy substance; In one embodiment, the low molecular weight diol is ethylene glycol and / or propylene glycol. The hydroxylic composition of claim 2.

4. the bio-based polyether polyol comprises bio-based polytrimethylene ether glycol; Preferably, the preparation monomers for the bio-based polyester polyol further comprise a bio-based diol; Preferably, the bio-based diol comprises bio-based 1,3-propylene glycol and / or bio-based 1,4-butanediol; Preferably, the dibasic acid other than the dimer acid comprises bio-based succinic acid and / or bio-based sebacic acid. The hydroxyl composition of any one of claims 1 to 3.

5. the bio-based diol is bio-based 1,3-propylene glycol; The hydroxylic composition of claim 4.

6. the chain extender comprises a C2 to C12 low molecular weight diol; Preferably, the C2 to C12 low molecular weight diol comprises any one or a combination of at least two of ethylene glycol, propylene glycol, butanediol, or hexanediol; The hydroxyl compound according to any one of claims 1 to 5.

7. the hydroxyl composition further comprises a non-bio-based polyether polyol; Preferably, the content of non-bio-based polyether polyol in the hydroxyl composition is 0 to 70 parts by weight and is not equal to 0. The hydroxyl compound according to any one of claims 1 to 6.

8. A process for preparing the hydroxyl compound according to any one of claims 1 to 7, comprising the steps of: mixing a vegetable oil polyol, a bio-based polyol, a chain extender, and an optional non-bio-based polyether polyol to obtain said hydroxyl compound; Method for preparing hydroxyl compounds.

9. 1. A bio-based polyurethane comprising: The raw materials for preparing the bio-based polyurethane include component A and component B, The component A comprises the hydroxyl compound according to any one of claims 1 to 7, The B component comprises a bio-based polyurethane prepolymer. Bio-based polyurethane.

10. The content of NCO groups in the bio-based polyurethane prepolymer is 15 to 25% by weight, Preferably, the mass ratio of the A component to the B component is 100:(50 to 150), Preferably, the component A further contains one or a combination of at least two of silicone oil, a leveling aid, or water, Preferably, the A component is obtained by mixing a hydroxyl compound, an optional silicone oil, an optional leveling aid, and an optional water; Preferably, the raw materials for preparing the bio-based polyurethane further comprise a catalyst component; Preferably, the catalyst component comprises an organobismuth catalyst and / or an organotin catalyst; Preferably, the weight of the catalyst component is 0.025 to 1% based on the weight of the component A being 100%. The bio-based polyurethane of claim 9.

11. 11. A bio-based polyurethane comprising the bio-based polyurethane of claim 9 or 10. Synthetic leather.

12. 12. A method for preparing the synthetic leather of claim 11, comprising: Step (1) of mixing component A with an optional catalyst component, adding component B and mixing to obtain a coating solution; and step (2) of applying the coating liquid obtained in step (1) to a surface layer, laminating a base fabric thereon, and curing the resulting synthetic leather. Method for preparing synthetic leather.

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