A kind of all-water foamed bio-based polyurethane material and preparation method thereof

Abstract

The invention discloses a fully water-foamed bio-based polyurethane material and a preparation method thereof, and belongs to the technical field of polyurethane. The bio-based polyurethane material is composed of component A and component B; component A includes vegetable oil-based polyether polyol, sucrose polyether polyol, bio-based flame retardant, water, catalyst, chain extender, and foam stabilizer; component B is isocyanate. The preparation method comprises the following steps: stirring and mixing component A and component B, and then freely foaming to form a crude product; and ripening and curing the crude product to obtain a fully water-foamed bio-based polyurethane material. The fully water-foamed bio-based polyurethane material prepared by the invention has excellent dimensional stability and flame retardancy, is biodegradable, and has a simple preparation process and low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of polyurethane, and in particular relates to a full-water foamed bio-based polyurethane material and a preparation method thereof. Background Art

[0002] Foamed polyurethane materials have the advantages of low density, light weight, low thermal conductivity, good cushioning, sound absorption and heat insulation, etc. They are widely used in the fields of transportation, packaging and construction, sporting goods and shoe materials. The foaming agents used in the preparation of foamed polyurethane materials can be divided into two categories: physical foaming agents and chemical foaming agents. Among them, chlorofluorocarbon foaming agents, as commonly used physical foaming agents, use gases produced by high-temperature decomposition / high-temperature gasification to trigger foaming, but they will damage the ozone layer during use and aggravate the greenhouse effect. In comparison, water is the most ideal foaming agent, with zero potential for depletion of the ozone layer, no greenhouse effect, and a green and environmentally friendly preparation process, simple operation and low cost. Therefore, all-water foamed polyurethane materials are becoming more and more popular.

[0003] In addition, most of the existing polyurethane materials are prepared by reacting petroleum-based polyether / polyester polyols and isocyanates, but petroleum is a non-renewable resource and has limited biodegradability, and it is urgent to find alternative bio-based materials. For example, vegetable oil can be used as an initiator to prepare bio-based polyols through corresponding reactions to replace petroleum-based polyols. Chinese patent CN111454427A discloses a full-water foamed biomass-based rigid polyurethane foam and a preparation method thereof, wherein fermentation waste residue is used to completely replace petroleum-based polyether polyols, and after being uniformly stirred at high speed with foam stabilizers, uniform foaming agents, chain extenders, catalysts, isocyanates and water, the foam is quickly poured into a mold for foaming, and a biomass-based foam plastic is obtained by foaming in a one-step method, and its preparation process adopts full-water foaming, does not contain chlorofluorocarbon compounds, and the ozone destructive effect ODP value is zero, the method is simple, and the cost is low, and the foam plastic biodegradability obtained at the same time has good compressive strength and low thermal conductivity, but the flame retardancy of the foam plastic itself is poor, and further improvement is still needed. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a fully water-foamed bio-based polyurethane material, which adopts bio-based polyols and bio-based flame retardants and uses water as a foaming agent. It is not only green and environmentally friendly, but also has good biodegradability and excellent dimensional stability and flame retardancy. The present invention also provides a preparation method of the above-mentioned fully water-foamed bio-based polyurethane material.

[0005] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0006] The component A is composed of the following raw materials: 70-80 parts by weight of vegetable oil-based polyether polyol, 40-50 parts by weight of sucrose polyether polyol, 20-30 parts by weight of bio-based flame retardant, 4-6 parts by weight of water, 1-2 parts by weight of catalyst, 2-4 parts by weight of chain extender, and 1-3 parts by weight of foam stabilizer; the component B is 200-210 parts by weight of isocyanate.

[0007] Preferably, the preparation method of the bio-based flame retardant is:

[0008] Adding sodium alginate into water and stirring, and obtaining a sodium alginate solution after the sodium alginate is completely dissolved; adding melamine cyanurate into water and stirring, and obtaining a melamine cyanurate dispersion after the melamine cyanurate is evenly dispersed; adding the sodium alginate solution into the melamine cyanurate dispersion under stirring, continuing stirring, centrifuging, and drying to obtain an intermediate product;

[0009] The above intermediate product is added into water and stirred, and the intermediate product dispersion is obtained after being evenly dispersed. Inositol hexaphosphate is added into ammonia water and stirred, and the alkaline solution of inositol hexaphosphate is obtained after being completely dissolved. The alkaline solution of inositol hexaphosphate is added into the intermediate product dispersion under stirring conditions, and the stirring is continued. The process is centrifuged and dried to obtain a bio-based flame retardant.

[0010] Polyurethane foam material is a flammable organic polymer material, which contains flammable hydrogen bond segments, and has the characteristics of low density and large specific surface area. When burning, the porous foam structure has a large contact area with oxygen, making it easier to burn and producing a large amount of toxic smoke, which poses a safety hazard. The most commonly used method is to improve the flame retardant properties of polyurethane foam materials by adding suitable flame retardants. Therefore, the present invention prepares a bio-based flame retardant suitable for polyurethane foam materials, which not only conforms to the concept of green environmental protection, but also has good compatibility with the base material, can significantly improve the flame retardant properties of the material, and will not have an adverse effect on the compressive strength, dimensional stability, etc. of the material itself.

[0011] The bio-based flame retardant of the present invention uses melamine cyanurate as the core, and is sequentially treated with sodium alginate and phytic acid, which are renewable resources, to form a double shell layer on the outside. When the foamed polyurethane material burns, the decomposition of melamine cyanurate absorbs a large amount of heat, reduces the surface temperature of the material, and further decomposes to generate non-combustible gas, which can quickly dilute the combustibles and oxygen generated by the material, reduce the concentration of the combustible gas, and promote the formation of a carbon foam layer, which isolates the heat and the convection exchange of external oxygen and plays a protective role; polyhydroxy sodium alginate, as a carbon-forming agent, can form a dense carbon layer during combustion, and assist melamine cyanurate in playing a flame retardant role; phytic acid can release a large amount of inorganic acid, which, as a dehydrating agent, dehydrates the foamed material to form a dense carbonized zone, and reacts with the melamine structure to generate salt covering the surface of the carbon layer, thickens the carbon layer, further prevents the transfer of gas and heat, and protects the unburned and degraded polyurethane material. In addition, the hydroxyl functional groups rich in the double shell can react with isocyanate to improve the compatibility of the bio-based flame retardant in the polyurethane matrix and make it evenly dispersed, thereby avoiding adverse effects on the compressive strength and dimensional stability of the foamed polyurethane material itself, ensuring that the material has excellent comprehensive performance.

[0012] Preferably, the preparation method of the bio-based flame retardant is:

[0013] 1-2 parts by weight of sodium alginate is added to 100-200 parts by weight of water and stirred to obtain a sodium alginate solution after complete dissolution; 10-12 parts by weight of melamine cyanurate is added to 200-300 parts by weight of water and stirred to obtain a melamine cyanurate dispersion after uniform dispersion; under stirring conditions, the sodium alginate solution is added to the melamine cyanurate dispersion at a uniform speed of 40-50 minutes, and after the end, stirring is continued for 10-15 minutes, centrifuged, and dried to obtain an intermediate product;

[0014] The intermediate product is added to 100-200 parts by weight of water and stirred to obtain an intermediate product dispersion after uniform dispersion; 1-2 parts by weight of inositol hexaphosphate is added to 100-200 parts by weight of 1-1.5wt% ammonia water and stirred to obtain an alkaline solution of inositol hexaphosphate after complete dissolution; the alkaline solution of inositol hexaphosphate is added to the intermediate product dispersion under stirring conditions, and the addition is completed at a uniform speed of 40-50 minutes. After the addition is completed, stirring is continued for 10-15 minutes, centrifuged, and dried to obtain a bio-based flame retardant.

[0015] Preferably, the stirring speed is 100-300 rpm.

[0016] Preferably, the catalyst is any one of stannous octoate, dibutyltin dilaurate, antimony glycol, dibutyltin diacetate, and triethanolamine.

[0017] Preferably, the chain extender is any one of 1,2-propylene glycol, 1,4-butanediol and ethylene glycol.

[0018] Preferably, the vegetable oil-based polyether polyol is one or a mixture of two or more of soybean oil polyether polyol, castor oil polyether polyol, linseed oil polyether polyol, corn oil polyether polyol and palm oil polyether polyol.

[0019] Preferably, castor oil polyether polyol is prepared by ring-opening polymerization of propylene oxide using renewable resource castor oil as an initiator; the hydroxyl value is 260-300 mgKOH / g and the molecular weight is 4000-6000.

[0020] Preferably, the sucrose polyether polyol is prepared by ring-opening polymerization of propylene oxide using renewable resources sucrose and glycerol as initiators; the hydroxyl value is 330-370 mgKOH / g and the viscosity is 2000-4000 mPa·s (25° C.).

[0021] Preferably, the foam stabilizer is a silicone surfactant.

[0022] Preferably, the foam stabilizer may be one or a mixture of two or more of B8462, B8409, B8510, and B8545 provided by Evonik (Degussa).

[0023] Preferably, the isocyanate is polymethylene polyphenyl polyisocyanate with an NCO content of 30.5-32%.

[0024] Preferably, the isocyanate may be isocyanate PM-200 provided by Wanhua Chemical, the product number of which is The NCO content is 30.5-32%, and the viscosity is 150-250 mPa·s (25°C).

[0025] The present invention also provides a method for preparing the above-mentioned all-water foamed bio-based polyurethane material, which specifically comprises the following steps:

[0026] After mixing component A and component B, the components are quickly poured into a mold for free foaming to form a crude product; the crude product is matured and cured to obtain a fully water-foamed bio-based polyurethane material.

[0027] Preferably, the aging temperature is 25-35° C. and the time is 1-2 h.

[0028] Preferably, the curing temperature is 50-60° C. and the curing time is 5-8 hours.

[0029] Beneficial effects of the present invention:

[0030] The present invention adopts bio-based materials such as plant oil-based polyether polyols, sucrose polyether polyols and bio-based flame retardants as raw materials, which not only gives the foamed polyurethane material good biodegradability, with the biodegradability rate reaching more than 16% on the 45th day, but also has low thermal conductivity, good dimensional stability and flame retardancy. DETAILED DESCRIPTION

[0031] The above content of the present invention is further described in detail below in conjunction with specific implementation modes, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments.

[0032] Example 1

[0033] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0034] The component A is composed of the following raw materials: 75 parts by weight of castor oil polyether polyol, 45 parts by weight of sucrose polyether polyol, 25 parts by weight of bio-based flame retardant, 5 parts by weight of water, 1.5 parts by weight of catalyst, 3 parts by weight of chain extender, and 2 parts by weight of foam stabilizer B8462; the component B is 205 parts by weight of isocyanate PM-200.

[0035] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0036] The preparation method of the bio-based flame retardant is:

[0037] 1.5 parts by weight of sodium alginate is added to 150 parts by weight of water and stirred to obtain a sodium alginate solution after complete dissolution; 11.5 parts by weight of melamine cyanurate is added to 250 parts by weight of water and stirred to obtain a melamine cyanurate dispersion after uniform dispersion; the sodium alginate solution is added to the melamine cyanurate dispersion under stirring conditions, and the addition is completed at a uniform speed of 45 minutes. After the addition is completed, stirring is continued for 12 minutes, centrifuged, and dried to obtain an intermediate product;

[0038] The intermediate product is added to 150 parts by weight of water and stirred to obtain an intermediate product dispersion after uniform dispersion; 1.5 parts by weight of phytic acid is added to 150 parts by weight of 1.2 wt% ammonia water and stirred to obtain an alkaline solution of phytic acid after complete dissolution; the alkaline solution of phytic acid is added to the intermediate product dispersion under stirring conditions, and the addition is completed at a uniform speed of 45 minutes. After the addition, stirring is continued for 12 minutes, centrifuged, and dried to obtain a bio-based flame retardant. The stirring speed is 250 rpm.

[0039] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0040] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0041] Example 2

[0042] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0043] The component A is composed of the following raw materials: 70 parts by weight of castor oil polyether polyol, 40 parts by weight of sucrose polyether polyol, 20 parts by weight of bio-based flame retardant, 4 parts by weight of water, 1 part by weight of catalyst, 2 parts by weight of chain extender, and 1 part by weight of foam stabilizer B8462; the component B is 200 parts by weight of isocyanate PM-200.

[0044] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0045] The preparation method of the bio-based flame retardant is the same as that of Example 1.

[0046] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0047] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0048] Example 3

[0049] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0050] The component A is composed of the following raw materials: 80 parts by weight of castor oil polyether polyol, 50 parts by weight of sucrose polyether polyol, 30 parts by weight of bio-based flame retardant, 6 parts by weight of water, 2 parts by weight of catalyst, 4 parts by weight of chain extender, and 3 parts by weight of foam stabilizer B8462; the component B is 210 parts by weight of isocyanate PM-200.

[0051] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0052] The preparation method of the bio-based flame retardant is the same as that of Example 1.

[0053] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0054] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0055] Example 4

[0056] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0057] The component A is composed of the following raw materials: 75 parts by weight of castor oil polyether polyol, 45 parts by weight of sucrose polyether polyol, 25 parts by weight of bio-based flame retardant, 5 parts by weight of water, 1.5 parts by weight of catalyst, 3 parts by weight of chain extender, and 2 parts by weight of foam stabilizer B8462; the component B is 205 parts by weight of isocyanate PM-200.

[0058] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0059] The preparation method of the bio-based flame retardant is:

[0060] 11.5 parts by weight of melamine cyanurate are added to 250 parts by weight of water and stirred to obtain a melamine cyanurate dispersion after uniform dispersion; 1.5 parts by weight of inositol hexaphosphate are added to 150 parts by weight of 1.2wt% ammonia water and stirred to obtain an alkaline solution of inositol hexaphosphate after complete dissolution; the alkaline solution of inositol hexaphosphate is added to the melamine cyanurate dispersion under stirring conditions, and the addition is completed at a uniform speed of 45 minutes. After the addition, stirring is continued for 12 minutes, centrifuged, and dried to obtain a bio-based flame retardant. The stirring speed is 250rpm.

[0061] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0062] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0063] Example 5

[0064] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0065] The component A is composed of the following raw materials: 75 parts by weight of castor oil polyether polyol, 45 parts by weight of sucrose polyether polyol, 25 parts by weight of bio-based flame retardant, 5 parts by weight of water, 1.5 parts by weight of catalyst, 3 parts by weight of chain extender, and 2 parts by weight of foam stabilizer B8462; the component B is 205 parts by weight of isocyanate PM-200.

[0066] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0067] The preparation method of the bio-based flame retardant is:

[0068] 1.5 parts by weight of sodium alginate is added to 150 parts by weight of water and stirred to obtain a sodium alginate solution after complete dissolution; 11.5 parts by weight of melamine cyanurate is added to 250 parts by weight of water and stirred to obtain a melamine cyanurate dispersion after uniform dispersion; the sodium alginate solution is added to the melamine cyanurate dispersion under stirring conditions, and the addition is completed at a uniform speed of 45 minutes. After the addition, stirring is continued for 12 minutes, centrifuged, and dried to obtain a bio-based flame retardant. The stirring speed is 250 rpm.

[0069] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0070] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0071] Example 6

[0072] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0073] The component A is composed of the following raw materials: 75 parts by weight of castor oil polyether polyol, 45 parts by weight of sucrose polyether polyol, 25 parts by weight of flame retardant, 5 parts by weight of water, 1.5 parts by weight of catalyst, 3 parts by weight of chain extender, and 2 parts by weight of foam stabilizer B8462; the component B is 205 parts by weight of isocyanate PM-200.

[0074] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0075] The flame retardant is prepared by mixing 3 parts by weight of ammonium polyphosphate and 11.5 parts by weight of melamine cyanurate.

[0076] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0077] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0078] Control group

[0079] A fully water-foamed bio-based polyurethane material, consisting of component A and component B;

[0080] The component A is composed of the following raw materials: 75 parts by weight of castor oil polyether polyol, 45 parts by weight of sucrose polyether polyol, 5 parts by weight of water, 1.5 parts by weight of catalyst, 3 parts by weight of chain extender, and 2 parts by weight of foam stabilizer B8462; the component B is 205 parts by weight of isocyanate PM-200.

[0081] The catalyst is dibutyltin dilaurate; and the chain extender is 1,4-butanediol.

[0082] A fully water-foamed bio-based polyurethane material comprises the following steps:

[0083] After mixing component A and component B, quickly pour them into a mold for free foaming to form a crude product; the crude product is ripened and cured to obtain a fully water-foamed bio-based polyurethane material. The ripening temperature is 30°C and the time is 1.5 hours; the curing temperature is 55°C and the time is 6 hours.

[0084] Test Example 1

[0085] The dimensional change rate (length) of the bio-based polyurethane material prepared in the example was tested at -30°C according to the standard GB / T8811-2008 to evaluate the dimensional stability of the sample. The thermal conductivity of the above bio-based polyurethane material was tested at 23°C according to the standard GB / T10295-2008.

[0086] Table 1 Thermal conductivity and dimensional stability of bio-based polyurethane materials

[0087] Thermal conductivity / mW / (m·K) Dimensional stability / % Example 1 19.7 -0.12％ Example 2 20.5 -0.09％ Example 3 20.0 -0.15％

[0088] Test Example 2

[0089] The compressive strength of the bio-based polyurethane material was tested according to the standard GB / T8813-2008, and the compressive strength change rate was calculated as follows: compressive strength change rate = (compressive strength of the embodiment - compressive strength of the control group) / compressive strength of the control group × 100%.

[0090] Table 2 Compressive strength of bio-based polyurethane materials

[0091] Compression strength change rate / % Example 1 -0.5％ Example 6 -4.2％

[0092] Test Example 3

[0093] The oxygen index of the above bio-based polyurethane materials was tested according to standard ASTM D2863-17.

[0094] Table 3 Oxygen index of bio-based polyurethane materials

[0095] Oxygen index / % Example 1 30.6％ Example 4 29.1％ Example 5 27.0％

[0096] It can be seen that the fully water-foamed bio-based polyurethane materials of Examples 1-3 have excellent comprehensive properties such as dimensional stability, flame retardancy and compressive strength. Compared with Examples 4-5, the bio-based flame retardant used in Example 1 has melamine cyanurate as the core, and forms a double shell layer on the outside after being treated with sodium alginate and phytic acid. When the foamed polyurethane material burns, the decomposition of melamine cyanurate will absorb a large amount of heat, reduce the surface temperature of the material, and further decompose to generate non-combustible gas, which can quickly dilute the combustibles and oxygen generated by the material, reduce the concentration of combustible gas, and promote the formation of a carbon foam layer, which isolates the heat and the convective exchange of external oxygen and plays a protective role; sodium polyhydroxy alginate, as a carbon-forming agent, can form a dense carbon layer during combustion, assisting melamine cyanurate in exerting a flame retardant effect; phytic acid can release a large amount of inorganic acid, which, as a dehydrating agent, dehydrates the foamed material to form a dense carbonized zone, and reacts with the melamine structure to generate salt covering the surface of the carbon layer, thickening the carbon layer, further preventing the transfer of gas and heat, and protecting the unburned and degraded polyurethane material. Compared with Example 6, the double shell of the bio-based flame retardant used in Example 1 is rich in hydroxyl functional groups, which can react with isocyanate, improve the compatibility of the bio-based flame retardant in the polyurethane matrix, and make it evenly dispersed, thereby avoiding adverse effects on the compressive strength of the foamed polyurethane material itself, and ensuring that the material has excellent comprehensive performance.

[0097] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A fully water-foamed bio-based polyurethane material, characterized in that: The invention is composed of component A and component B; the component A is composed of the following raw materials: 70-80 parts by weight of vegetable oil-based polyether polyol, 40-50 parts by weight of sucrose polyether polyol, 20-30 parts by weight of bio-based flame retardant, 4-6 parts by weight of water, 1-2 parts by weight of catalyst, 2-4 parts by weight of chain extender, and 1-3 parts by weight of foam stabilizer; the component B is 200-210 parts by weight of isocyanate; The preparation method of the bio-based flame retardant is: Adding sodium alginate into water and stirring, and obtaining a sodium alginate solution after the sodium alginate is completely dissolved; adding melamine cyanurate into water and stirring, and obtaining a melamine cyanurate dispersion after the melamine cyanurate is evenly dispersed; adding the sodium alginate solution into the melamine cyanurate dispersion under stirring conditions, continuing stirring, centrifuging, and drying to obtain an intermediate product; The above intermediate product is added into water and stirred, and the intermediate product dispersion is obtained after being evenly dispersed. Inositol hexaphosphate is added into ammonia water and stirred, and the alkaline solution of inositol hexaphosphate is obtained after being completely dissolved. The alkaline solution of inositol hexaphosphate is added into the intermediate product dispersion under stirring conditions, and the stirring is continued. The process is centrifuged and dried to obtain a bio-based flame retardant.

2. The fully water-foamed bio-based polyurethane material according to claim 1, characterized in that: The vegetable oil-based polyether polyol is one or a mixture of two or more of soybean oil polyether polyol, castor oil polyether polyol, linseed oil polyether polyol, corn oil polyether polyol and palm oil polyether polyol.

3. The fully water-foamed bio-based polyurethane material according to claim 1, characterized in that: The catalyst is any one of stannous octoate, dibutyltin dilaurate, antimony glycol, dibutyltin diacetate and triethanolamine.

4. The fully water-foamed bio-based polyurethane material according to claim 1, characterized in that: The chain extender is any one of 1,2-propylene glycol, 1,4-butanediol and ethylene glycol.

5. The fully water-foamed bio-based polyurethane material according to claim 1, characterized in that: The foam stabilizer is an organosilicon surfactant.

6. The fully water-foamed bio-based polyurethane material according to claim 1, characterized in that: The isocyanate is polymethylene polyphenyl polyisocyanate.