阅读说明：本技术 一种自修复、可回收的植物油基聚氨酯材料及其制备方法与应用 (Self-repairing and recyclable vegetable oil-based polyurethane material and preparation method and application thereof ) 是由 刘承果 张金帅 周永红 尚倩倩 胡云 胡立红 朱国强 余希希 黄佳 于 2021-09-14 设计创作，主要内容包括：一种自修复、可回收的植物油基聚氨酯材料及其制备方法与应用。本发明首先利用植物油、二元醇与二异氰酸酯在催化剂的作用下发生反应,得到植物油基聚氨酯中间产物；随后将N,N’-二叔丁基乙二胺加入到上述合成的中间产物中,得到植物油基聚氨酯树脂；经热压处理后,得到植物油基聚氨酯材料。所制备的植物油基聚氨酯材料具有优良的力学、热学、粘附、自修复和回收性能,可用于可逆交联剂、导电复合材料等。本发明工艺简单、环保,且原料部分来自于可再生资源,因此对促进聚氨酯材料产业的可持续发展具有重大的意义。(A self-repairing and recyclable vegetable oil-based polyurethane material, a preparation method and application thereof. Firstly, vegetable oil, dihydric alcohol and diisocyanate are reacted under the action of a catalyst to obtain a vegetable oil-based polyurethane intermediate product; adding N, N' -di-tert-butyl ethylenediamine into the synthesized intermediate product to obtain vegetable oil-based polyurethane resin; and carrying out hot-pressing treatment to obtain the vegetable oil-based polyurethane material. The prepared vegetable oil-based polyurethane material has excellent mechanical, thermal, adhesive, self-repairing and recycling properties, and can be used for reversible cross-linking agents, conductive composite materials and the like. The method has simple process and environmental protection, and the raw materials are partially from renewable resources, so the method has great significance for promoting the sustainable development of the polyurethane material industry.)

1. A self-repairing and recyclable vegetable oil-based polyurethane material is characterized in that vegetable oil, dihydric alcohol and diisocyanate are reacted under the action of a catalyst to obtain a vegetable oil-based polyurethane intermediate product; adding N, N' -di-tert-butyl ethylenediamine into the synthesized intermediate product to obtain vegetable oil-based polyurethane resin; and carrying out hot-pressing treatment to obtain the vegetable oil-based polyurethane material.

2. The self-repairing recyclable vegetable oil-based polyurethane material as claimed in claim 1, wherein the vegetable oil is at least one of castor oil, tung oil, linseed oil, rubber seed oil, dehydrated castor oil, rapeseed oil, cornus wilsoniana seed oil, sunflower seed oil, cotton seed oil, soybean oil, and corn oil.

3. The self-repairing recyclable vegetable oil-based polyurethane material as set forth in claim 1, wherein the diisocyanate is at least one of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and lysine diisocyanate.

4. The self-repairing and recyclable vegetable oil-based polyurethane material as set forth in claim 1, wherein the diol is at least one of tetraethylene glycol, triethylene glycol, polyethylene glycol, and polytetrahydrofuran ether glycol.

5. The self-repairing recyclable vegetable oil-based polyurethane material as set forth in claim 1, wherein the catalyst is at least one of dibutyltin dilaurate and 1, 4-diazabicyclo [2.2.2] octane.

6. The preparation method of the self-repairing and recyclable vegetable oil-based polyurethane material as claimed in any one of claims 1 to 5, characterized in that the preparation steps are as follows:

(1) adding vegetable oil, diisocyanate, dihydric alcohol and a catalyst into a reactor, uniformly stirring, heating to 20-100 ℃, and reacting for 1-10 h to obtain a vegetable oil-based polyurethane intermediate product;

(2) adding N, N' -di-tert-butyl ethylenediamine into the reactor, heating to 0-100 ℃, and reacting for 0.5-3 h to obtain vegetable oil-based polyurethane resin;

(3) and carrying out hot pressing treatment on the obtained resin, wherein the hot pressing temperature is 40-100 ℃, the applied pressure is 0.5-20 MPa, and the hot pressing time is 5-60 min, so as to obtain the vegetable oil-based polyurethane material.

7. The preparation method of the self-repairing and recyclable vegetable oil-based polyurethane material as claimed in claim 1, wherein the molar ratio of diisocyanate to vegetable oil is 1-10: 1, the molar ratio of the dihydric alcohol to the diisocyanate is 1: 1-10, the dosage of the catalyst is 0.5-2% of the total weight of the raw materials, and the molar ratio of the N, N' -di-tert-butyl ethylenediamine to the diisocyanate is 1: 0.5-4.

8. The use of the self-healing recyclable vegetable oil-based polyurethane material as set forth in any one of claims 1 to 5 in adhesives and conductive composites.

Technical Field

The invention belongs to the field of polyurethane materials, and particularly relates to a self-repairing and recyclable vegetable oil-based polyurethane material as well as a preparation method and application thereof.

Background

The biomass resource has the advantages of natural and renewable property, wide source, low price, biodegradability and the like, so the biomass resource is widely concerned and valued by people, is widely considered to be effectively utilized, and can solve or relieve the major problems of fossil resource exhaustion, environmental pollution and the like. Castor oil is a natural renewable resource, and due to its unique hydroxyl structure, it is a good candidate material for preparing polyurethane polymers. The long flexible fatty acid chains present in castor oil impart good flexibility to the resulting material, while the unique hydroxyl groups can undergo polycondensation with polyfunctional isocyanates to form hard segments, thereby imparting good mechanical strength to the resulting polyurethane material.

The conventional thermosetting polyurethane polymer has advantages of excellent dimensional stability, thermal stability and chemical resistance, but cannot be reprocessed by melting like a thermoplastic polymer due to the presence of a stable crosslinked structure, thereby causing waste of materials and environmental pollution. Inspired by natural biological wound self-healing, researchers introduced dynamic covalent bonds into polymer networks to prepare dynamic covalent polymers. Dynamic covalent polymers have the advantages of both thermoset and thermoplastic materials. Within certain limits they behave like thermosets with excellent mechanical and solvent resistance properties, but under special conditions these materials can also be recycled and reprocessed. Over the past few decades, great efforts have been made to discover different dynamic covalent chemistries. So far, many dynamic bonds including dynamic covalent bonds (disulfide bonds, ester bonds, schiff bases, boro-oxo bonds, Diels-Alder, etc.) and dynamic non-covalent bonds (ionic bonds, hydrogen bonds, metal coordination bonds, etc.) have been widely used in the preparation process of dynamic reversible polymers. In the field of vegetable oil-based polyurethane materials, dynamic covalent bonds including disulfide bonds (Angewandable Chemistry International Edition, 2021,60, 4289-. From the results, although the above approaches overcome the problems of non-recyclability and reprocessing of polyurethane materials, the obtained materials have high post-treatment temperature and generally low mechanical properties.

Disclosure of Invention

The technical problem to be solved is as follows: the invention provides a preparation method of a vegetable oil-based polyurethane material with excellent mechanical property, repairability and reprocessing, aiming at overcoming the defects that the existing vegetable oil-based polyurethane material cannot be repaired and reprocessed and has generally low mechanical property and the like.

The technical scheme is as follows: a self-repairing and recyclable vegetable oil-based polyurethane material is prepared by reacting vegetable oil, dihydric alcohol and diisocyanate under the action of a catalyst to obtain a vegetable oil-based polyurethane intermediate product; adding N, N' -di-tert-butyl ethylenediamine into the synthesized intermediate product to obtain vegetable oil-based polyurethane resin; and carrying out hot-pressing treatment to obtain the vegetable oil-based polyurethane material.

The vegetable oil is at least one of castor oil, tung oil, linseed oil, rubber seed oil, dehydrated castor oil, rapeseed oil, cornus wilsoniana seed oil, sunflower seed oil, cottonseed oil, soybean oil and corn oil.

The diisocyanate is at least one of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate.

The dihydric alcohol is at least one of tetraethylene glycol, triethylene glycol, polyethylene glycol and polytetrahydrofuran ether glycol.

The catalyst is at least one of dibutyltin dilaurate and 1, 4-diazabicyclo [2.2.2] octane.

The preparation method of any self-repairing and recyclable vegetable oil-based polyurethane material comprises the following preparation steps:

(1) adding vegetable oil, diisocyanate, dihydric alcohol and a catalyst into a reactor, uniformly stirring, heating to 20-100 ℃, and reacting for 1-10 h to obtain a vegetable oil-based polyurethane intermediate product;

(2) adding N, N' -di-tert-butyl ethylenediamine into the reactor, heating to 0-100 ℃, and reacting for 0.5-3 h to obtain vegetable oil-based polyurethane resin;

(3) and carrying out hot pressing treatment on the obtained resin, wherein the hot pressing temperature is 40-100 ℃, the applied pressure is 0.5-20 MPa, and the hot pressing time is 5-60 min, so as to obtain the vegetable oil-based polyurethane material.

The molar ratio of diisocyanate to vegetable oil is 1-10: 1, the molar ratio of the dihydric alcohol to the diisocyanate is 1: 1-10, the dosage of the catalyst is 0.5-2% of the total weight of the raw materials, and the molar ratio of the N, N' -di-tert-butyl ethylenediamine to the diisocyanate is 1: 0.5-4.

The self-repairing and recyclable vegetable oil-based polyurethane material is applied to adhesives and conductive composite materials.

Has the advantages that:

(1) the vegetable oil-based polyurethane material synthesized by the method has excellent mechanical, thermal, adhesion, self-repairing and recovery performances, and can be used for reversible cross-linking agents, conductive composite materials and the like;

(2) the synthesis method used in the invention is easy to operate and simple in process.

Drawings

Fig. 1 is a FT-IR spectrum of a castor oil based polyurethane intermediate.

Fig. 2 is a FT-IR spectrum of a castor oil-based polyurethane resin.

Detailed Description

The following examples are provided as further illustration of the invention and are not to be construed as limitations or limitations of the invention. The present invention will be described in more detail with reference to examples.

A self-repairing and recyclable vegetable oil-based polyurethane material and a preparation method and application thereof are disclosed, and the preparation steps are as follows: (1) adding vegetable oil, diisocyanate, dihydric alcohol and a catalyst into a reactor, wherein the molar ratio of the vegetable oil to the diisocyanate is 1 (1-10), the molar ratio of the dihydric alcohol to the diisocyanate is 1 (1-10), the addition amount of the catalyst is 0.02-2% of the total weight of the reaction materials, uniformly stirring, heating to 20-100 ℃, and reacting for 1-10 hours to obtain a vegetable oil-based polyurethane intermediate product; (2) adding N, N '-di-tert-butyl ethylenediamine into the reactor, wherein the molar ratio of the N, N' -di-tert-butyl ethylenediamine to diisocyanate is 1 (0.5-4), heating to 0-100 ℃, and reacting for 0.5-3 h to obtain the vegetable oil-based polyurethane resin; (3) and carrying out hot pressing treatment on the obtained resin, wherein the hot pressing temperature is 40-100 ℃, the applied pressure is 0.5-20 MPa, and the hot pressing time is 5-60 min, so as to obtain the vegetable oil-based polyurethane material.

Preferably, the vegetable oil in step (1) is at least one of castor oil, tung oil, linseed oil, rubber seed oil, dehydrated castor oil, rapeseed oil, cornus wilsoniana seed oil, sunflower seed oil, cotton seed oil, soybean oil and corn oil.

Preferably, the diisocyanate in step (1) is at least one of isophorone diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate and lysine diisocyanate, and the molar ratio of the vegetable oil to the diisocyanate is 1: 3.

Preferably, the diol in step (1) is at least one of tetraethylene glycol, triethylene glycol, polyethylene glycol and polytetrahydrofuran ether glycol, and the molar ratio of the diol to the diisocyanate is 1: 2.

Preferably, the catalyst in the step (1) is at least one of dibutyltin dilaurate and 1, 4-diazabicyclo [2.2.2] octane, and the amount of the catalyst is 0.5% of the total weight of the raw materials.

The vegetable oil-based polyurethane material prepared by the method.

Example 1

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 3:1) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CTI;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 1.

Example 2

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CTI 2;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 2.

Example 3

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 6:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:4) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CTI 3;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 3.

Example 4

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 4:1), triethylene glycol (the molar ratio of triethylene glycol to isophorone diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CDI;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 4.

Example 5

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 4:1) and polyethylene glycol (M) into a reactor_n1500) (molar ratio of polyethylene glycol to isophorone diisocyanate 1:8) and catalyst dibutyltin dilaurate (catalyst added in the total weight of the reaction mass)0.5 percent of the total amount of the components, uniformly stirring, heating to 50 ℃, and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CPI;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 5.

Example 6

(1) Adding castor oil, toluene diisocyanate (the molar ratio of the toluene diisocyanate to the castor oil is 4:1), tetraethylene glycol (the molar ratio of the tetraethylene glycol to the toluene diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of the reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CTT;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the toluene diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 6.

Example 7

(1) Adding castor oil, dicyclohexylmethane diisocyanate (the molar ratio of dicyclohexylmethane diisocyanate to castor oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to dicyclohexylmethane diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the addition of the catalyst is 0.5% of the total weight of the reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2h to obtain a castor oil-based polyurethane intermediate product CTD;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the dicyclohexylmethane diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 7.

Example 8

(1) Adding castor oil, lysine diisocyanate (the molar ratio of the lysine diisocyanate to the castor oil is 4:1), tetraethylene glycol (the molar ratio of the tetraethylene glycol to the lysine diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of the reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a castor oil-based polyurethane intermediate product CTA;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the lysine diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 30min, and then carrying out hot-pressing treatment on the obtained product (the hot-pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot-pressing time is 10min) to obtain the castor oil-based polyurethane material HUB 8.

Example 9

(1) Adding castor oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to castor oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:8) and a catalyst 1, 4-diazabicyclo [2.2.2] octane into a reactor (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials), uniformly stirring, and heating to 50 ℃ for reaction for 2 hours to obtain a castor oil-based polyurethane intermediate product CTI 4;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the castor oil-based polyurethane material HUB 9.

Example 10

(1) Adding rubber seed oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to rubber seed oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a rubber seed oil-based polyurethane intermediate product RTI 2;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the rubber seed oil-based polyurethane material HUB 10.

Example 11

(1) Adding smooth bark tree seed oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to smooth bark tree seed oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:8) and dibutyltin dilaurate serving as a catalyst (the addition of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, and heating to 50 ℃ for reaction for 2 hours to obtain a smooth bark tree seed oil-based polyurethane intermediate product GTI 2;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the smooth bark tree seed oil based polyurethane material HUB 11.

Example 12

(1) Adding soybean oil, isophorone diisocyanate (the molar ratio of isophorone diisocyanate to soybean oil is 4:1), tetraethylene glycol (the molar ratio of tetraethylene glycol to isophorone diisocyanate is 1:8) and a catalyst dibutyltin dilaurate (the adding amount of the catalyst is 0.5 percent of the total weight of reaction materials) into a reactor, uniformly stirring, heating to 50 ℃ and reacting for 2 hours to obtain a soybean oil-based polyurethane intermediate product STI 2;

(2) adding N, N '-di-tert-butylethylenediamine (the molar ratio of the N, N' -di-tert-butylethylenediamine to the isophorone diisocyanate is 1:2) into the reactor, heating to 20 ℃ for reaction for 0.5h, and then carrying out hot pressing (the hot pressing temperature is 60 ℃, the applied pressure is 10MPa, and the hot pressing time is 10min) treatment on the obtained product to obtain the soybean oil-based polyurethane material HUB 12.

Example 13

Tensile property: the mechanical properties of the polyurethane material were measured according to ASTM D638-2008 using a universal tester model SANS7 CMT-4304 (Shenzhen New Miss Instrument Co., Ltd.), with a gauge length of 50mm and a tensile rate of 5.0 mm/min. The sample size was 80X 10X 1mm³. Glass transition temperature: the dynamic thermomechanical properties were determined using a Q800 solid analyser (TA, USA). Thermogravimetric analysis: the thermodynamically stable properties of the polyurethane materials were determined using a STA409PC thermogravimetric analyzer (Netzsch, Germany). The heating interval is 40-600 ℃, and the heating rate is 15 ℃/min. Shear strength: the shear strength of the reversible crosslinking agent was determined according to GB/T7124-2008 using a SANS7 CMT-4304 model universal tester. Self-repairing efficiency: and the scratch repair efficiency is calculated by observing the reduction ratio of the scratch width before and after repair by using an ICC50W Leica optical microscope. The test results of each example are shown in Table 1.

Table 1 examples 1-12 main performance indicators of vegetable oil based polyurethane materials

As can be seen from the data in the table, the vegetable oil-based polyurethane material prepared by the invention has excellent tensile property, thermal property and adhesion property and high self-repairing efficiency, and can be used in the fields of polyurethane materials and reversible adhesives.

The above examples are only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.