Environment-friendly foam

Abstract

The invention discloses environment-friendly foam. The environment-friendly foam is prepared from the following components in parts by weight: 60 to 80 parts of hydroxyl-terminated PU (Polyurethane) resin, 20 to 40 parts of HDI (Hexamethylene Diisocyanate) tripolymer and 2 to 10 parts of m401, the preparation method of the environment-friendly foam comprises the following steps: taking the hydroxyl-terminated PU resin, the HDI tripolymer and m401 according to a preset proportion, uniformly stirring, and carrying out vacuum defoaming treatment to obtain a mixture; and then pouring the mixture into a preset mold, treating at 100-150 DEG C for preset time, and discharging to obtain the environment-friendly foam. According to the environment-friendly foam disclosed by the invention, the foaming agent m401 with a preset amount is added on the basis of the PU foam, so that the tensile strength and the elongation at break of the foam can be effectively improved on the premise of ensuring the generation of low organic volatile matters, the mechanical property of the environment-friendly foam is greatly improved, and the application scene of the environment-friendly foam is further expanded.

Description

Technical Field

[0001] The invention relates to the technical field of environmentally friendly foam, in particular to an environmentally friendly foam. Background Art

[0002] Environmentally friendly foam is a foam material that is both environmentally friendly and functional. It is usually used in packaging, filling, heat insulation, sound insulation and other fields. Compared with traditional foam materials, environmentally friendly foam has lower environmental impact in terms of raw material selection, production process, service life and waste disposal. In recent years, with the continuous maturity of PU (polyurethane) PSA technology, PU foam PSA has become one of the current research hotspots. It not only has the advantages of acrylic foam PSA, but also has the following advantages: the operating temperature range of PU foam PSA is wider than that of acrylic foam PSA; PU foam PSA not only meets the requirements of RoHS regulations in the electronic and electrical industry, but also can achieve zero VOC (volatile organic compounds) emissions through formula design, thereby improving the environmental friendliness of PU foam PSA.

[0003] PU foam adopts low VOCs formula and technology, which greatly reduces the harmful gases released by PU foam during production and use, improves safety and environmental protection, thereby reducing resource consumption and waste generation. However, the existing environmentally friendly PU foam has the problem of insufficient tensile strength, which leads to insufficient durability of the environmentally friendly PU foam. Summary of the invention

[0004] Based on this, it is necessary to provide an environmentally friendly foam to address the technical problem of insufficient tensile strength of existing environmentally friendly PU foam.

[0005] An environmentally friendly foam comprises the following components by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401.

[0006] The preparation method of environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 100-150°C for a preset time, and then discharging the material to obtain environmentally friendly foam.

[0007] The hydroxyl-terminated PU resin comprises the following components by weight: 20-40 parts of HDI, 30-50 parts of polyether polyol N-220, 10-30 parts of polyether polyol 330N, 2-15 parts of DEG, 0.01-0.1 parts of stannous octoate and 0.01-0.1 parts of DBTDL.

[0008] The preparation method of the hydroxyl-terminated PU resin comprises the following steps: a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N are put into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, N2 is continuously introduced when the temperature is raised to 80°C, and the reaction is carried out for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours.

[0009] In one embodiment, the above-mentioned environmentally friendly foam comprises the following components by weight: 60 parts of hydroxyl-terminated PU resin, 20 parts of HDI trimer and 2 parts of m401.

[0010] In one embodiment, the preparation method of the above-mentioned environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a reduced pressure degassing treatment to obtain a mixture; then pouring the above-mentioned mixture into a preset mold, treating it at 100°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0011] In one embodiment, the hydroxyl-terminated PU resin comprises the following components by weight: 20 parts of HDI, 30 parts of polyether polyol N-220, 10 parts of polyether polyol 330N, 2 parts of DEG, 0.01 parts of stannous octoate and 0.01 parts of DBTDL.

[0012] In one embodiment, the environmentally friendly foam comprises the following components by weight: 80 parts of hydroxyl-terminated PU resin, 40 parts of HDI trimer and 10 parts of m401.

[0013] In one embodiment, the preparation method of the above-mentioned environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a reduced pressure degassing treatment to obtain a mixture; then pouring the above-mentioned mixture into a preset mold, treating it at 150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0014] In one embodiment, the hydroxyl-terminated PU resin comprises the following components by weight: 40 parts of HDI, 50 parts of polyether polyol N-220, 30 parts of polyether polyol 330N, 15 parts of DEG, 0.1 parts of stannous octoate and 0.1 parts of DBTDL.

[0015] In one embodiment, the above-mentioned environmentally friendly foam comprises the following components by weight: 70 parts of hydroxyl-terminated PU resin, 30 parts of HDI trimer and 5 parts of m401.

[0016] In one embodiment, the hydroxyl-terminated PU resin comprises the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

[0017] In one embodiment, the environmentally friendly foam comprises the following components by weight: 65 parts of hydroxyl-terminated PU resin, 35 parts of HDI trimer and 4 parts of m401.

[0018] In one embodiment, the hydroxyl-terminated PU resin comprises the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

[0019] In one embodiment, the preparation method of the above-mentioned environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a reduced pressure degassing treatment to obtain a mixture; then pouring the above-mentioned mixture into a preset mold, treating it at 120°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0020] The above-mentioned environmentally friendly foam comprises the following components by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401; wherein, the reactivity and crosslinking degree of the hydroxyl-terminated PU resin can be precisely controlled, and the hydroxyl-terminated resin has good adhesion and coating properties, can provide elasticity and hardness for the foam, and at the same time, its synergistic HDI trimer can effectively improve wear resistance, chemical resistance and weather resistance; and m401, as a foaming agent, can significantly increase the reaction rate between the hydroxyl-terminated PU resin and the HDI trimer, making the production process more efficient, and can also improve the mechanical properties and chemical stability of the foam product. The preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then decompressing and degassing them to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 100-150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam. The environmentally friendly foam of the present invention is based on PU foam and adds a preset amount of foaming agent m401. It can effectively improve the tensile strength and elongation at break of the foam while ensuring low organic volatiles. This greatly improves the mechanical properties of the environmentally friendly foam, improves durability and service life, and thus reduces resource consumption and waste generation. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in combination with the following. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below. Example 1

[0022] The present invention discloses an environmentally friendly foam, which comprises the following components by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401; wherein, the reactivity and crosslinking degree of the hydroxyl-terminated PU resin can be precisely controlled, and the hydroxyl-terminated resin has good adhesion and coating properties, can provide elasticity and hardness for the foam, and at the same time, its synergistic HDI trimer can effectively improve wear resistance, chemical resistance and weather resistance; and m401, as a foaming agent, can significantly increase the reaction rate between the hydroxyl-terminated PU resin and the HDI trimer, making the production process more efficient, and can also improve the mechanical properties and chemical stability of the foam product. Specifically, the preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 100-150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam. The environmentally friendly foam of the present invention is based on PU foam and adds a preset amount of foaming agent m401, which can effectively improve the tensile strength and elongation at break of the foam while ensuring low organic volatiles. This greatly improves the mechanical properties of the environmentally friendly foam and further expands the application scenarios of the environmentally friendly foam.

[0023] Further, the hydroxyl-terminated PU resin comprises the following components by weight: 20-40 parts of HDI, 30-50 parts of polyether polyol N-220, 10-30 parts of polyether polyol 330N, 2-15 parts of DEG, 0.01-0.1 parts of stannous octoate and 0.01-0.1 parts of DBTDL. Among them, HDI, as a diisocyanate, can react with polyols to form polyurethane chains. By adjusting the ratio of HDI to polyols, the chain length and molecular weight of PU resin can be adjusted, thereby affecting the mechanical and thermal properties of the material; the ether bond structure in polyether polyol N220 gives polyurethane flexibility, making PU resin have good elasticity and softness; polyether polyol 330N, as another polyol, is used in conjunction with N-220 to adjust the hardness, flexibility and balance of polyurethane; DEG is used as a chain extender and reactive diluent to control the molecular weight and viscosity of PU resin; stannous octoate is combined with DBTDL as a blowing agent and can effectively increase the reaction rate of isocyanate and polyol while controlling the reaction process.

[0024] Specifically, the preparation method of the above-mentioned hydroxyl-terminated PU resin includes the following steps: putting a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, continuously introducing N2 when the temperature is raised to 80°C, and reacting for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours.

[0025] In this embodiment, based on the above-mentioned environmentally friendly foam components and preparation methods, under the conditions of 65 parts of hydroxyl-terminated PU resin, 35 parts of HDI trimer and 120°C mold processing temperature, the mechanical properties of environmentally friendly foams with different m401 addition amounts were experimentally studied by adjusting the addition amount of m401, and the results are shown in Table 1.

[0026] Table 1

[0027] It can be seen from Table 1 that with the continuous increase in the amount of m401 foaming agent added, the tensile strength and breaking strength of the environmentally friendly foam both show a trend of first increasing and then decreasing. When the amount of m401 added is 4 parts by weight, the tensile strength and breaking elongation of the environmentally friendly foam are relatively large. Example 2

[0028] In this embodiment, the environmentally friendly foam includes the following components by weight: 60 parts of hydroxyl-terminated PU resin, 20 parts of HDI trimer and 2 parts of m401; specifically, the preparation method of the environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 100°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0029] Further, the hydroxyl-terminated PU resin includes the following components by weight: 20 parts of HDI, 30 parts of polyether polyol N-220, 10 parts of polyether polyol 330N, 2 parts of DEG, 0.01 parts of stannous octoate and 0.01 parts of DBTDL.

[0030] Specifically, the preparation method of the above-mentioned hydroxyl-terminated PU resin includes the following steps: putting a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, continuously introducing N2 when the temperature is raised to 80°C, and reacting for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours. Example 3

[0031] In this embodiment, the environmentally friendly foam includes the following components by weight: 80 parts of hydroxyl-terminated PU resin, 40 parts of HDI trimer and 10 parts of m401. Specifically, the preparation method of the environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0032] Further, the hydroxyl-terminated PU resin includes the following components by weight: 40 parts of HDI, 50 parts of polyether polyol N-220, 30 parts of polyether polyol 330N, 15 parts of DEG, 0.1 parts of stannous octoate and 0.1 parts of DBTDL.

[0033] Specifically, the preparation method of the above-mentioned hydroxyl-terminated PU resin includes the following steps: putting a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, continuously introducing N2 when the temperature is raised to 80°C, and reacting for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours. Example 4

[0034] In this embodiment, the environmentally friendly foam includes the following components by weight: 70 parts of hydroxyl-terminated PU resin, 30 parts of HDI trimer and 5 parts of m401. Specifically, the preparation method of the environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0035] Further, the hydroxyl-terminated PU resin includes the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

[0036] Specifically, the preparation method of the above-mentioned hydroxyl-terminated PU resin includes the following steps: putting a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, continuously introducing N2 when the temperature is raised to 80°C, and reacting for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours. Example 5

[0037] In this embodiment, the environmentally friendly foam includes the following components by weight: 65 parts of hydroxyl-terminated PU resin, 35 parts of HDI trimer and 4 parts of m401. Specifically, the preparation method of the environmentally friendly foam includes the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 120°C for a preset time, and then discharging the material to obtain the environmentally friendly foam.

[0038] Further, the hydroxyl-terminated PU resin includes the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

[0039] Specifically, the preparation method of the above-mentioned hydroxyl-terminated PU resin includes the following steps: putting a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N into a 500mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, continuously introducing N2 when the temperature is raised to 80°C, and reacting for 2 hours; after the reaction is completed, the temperature is lowered to 60°C, a preset amount of DEG is added dropwise, and after the dropwise addition, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the reaction is kept warm for 4 hours.

[0040] In summary, an environmentally friendly foam of the present invention comprises the following components by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401; wherein, the reactivity and crosslinking degree of the hydroxyl-terminated PU resin can be precisely controlled, and the hydroxyl-terminated resin has good adhesion and coating properties, can provide elasticity and hardness for the foam, and at the same time, its synergistic HDI trimer can effectively improve wear resistance, chemical resistance and weather resistance; and m401, as a foaming agent, can significantly increase the reaction rate between the hydroxyl-terminated PU resin and the HDI trimer, making the production process more efficient, and can also improve the mechanical properties and chemical stability of the foam product. The preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 100-150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam. The environmentally friendly foam of the present invention is based on PU foam and adds a preset amount of foaming agent m401. It can effectively improve the tensile strength and elongation at break of the foam while ensuring low organic volatiles. This greatly improves the mechanical properties of the environmentally friendly foam, improves durability and service life, and thus reduces resource consumption and waste generation.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

[0043] The present invention discloses an environmentally friendly foam, which comprises the following components by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401; the preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the mixture into a preset mold, treating it at 100-150°C for a preset time, and then discharging the material to obtain the environmentally friendly foam. The environmentally friendly foam of the present invention is based on the PU foam and adding a preset amount of foaming agent m401, which can effectively improve the tensile strength and elongation at break of the foam under the premise of ensuring low generation of organic volatiles, thereby greatly improving the mechanical properties of the environmentally friendly foam, thereby expanding the application scenarios of the environmentally friendly foam.

Claims

1. An environmentally friendly foam, characterized in that: The following components are included by weight: 60-80 parts of hydroxyl-terminated PU resin, 20-40 parts of HDI trimer and 2-10 parts of m401; The preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the mixture into a preset mold, treating it at 100-150° C. for a preset time, and then discharging the material to obtain the environmentally friendly foam; The hydroxyl-terminated PU resin comprises the following components by weight: 20-40 parts of HDI, 30-50 parts of polyether polyol N-220, 10-30 parts of polyether polyol 330N, 2-15 parts of DEG, 0.01-0.1 parts of stannous octoate and 0.01-0.1 parts of DBTDL; The preparation method of the hydroxyl-terminated PU resin comprises the following steps: a preset amount of HDI, polyether polyol N-220 and polyether polyol 330N are added into a 500 mL four-necked flask equipped with an electric stirrer, a reflux condenser, a thermometer and a constant pressure dropping funnel, N2 is continuously introduced when the temperature is raised to 80° C., and the reaction is carried out for 2 hours; after the reaction is completed, the temperature is lowered to 60° C., a preset amount of DEG is added dropwise, and after the addition is completed, 4 drops of stannous octoate and 4 drops of DBTDL are added respectively, and the hydroxyl-terminated PU resin is obtained after the temperature is kept high for 4 hours.

2. The environmentally friendly foam according to claim 1, characterized in that: The environmentally friendly foam comprises the following components by weight: 60 parts of hydroxyl-terminated PU resin, 20 parts of HDI trimer and 2 parts of m401.

3. The environmentally friendly foam according to claim 1, characterized in that: The hydroxyl-terminated PU resin includes the following components by weight: 20 parts of HDI, 30 parts of polyether polyol N-220, 10 parts of polyether polyol 330N, 2 parts of DEG, 0.01 parts of stannous octoate and 0.01 parts of DBTDL.

4. The environmentally friendly foam according to claim 1, characterized in that: The environmentally friendly foam comprises the following components by weight: 80 parts of hydroxyl-terminated PU resin, 40 parts of HDI trimer and 10 parts of m401.

5. The environmentally friendly foam according to claim 1, characterized in that: The hydroxyl-terminated PU resin includes the following components by weight: 40 parts of HDI, 50 parts of polyether polyol N-220, 30 parts of polyether polyol 330N, 15 parts of DEG, 0.1 parts of stannous octoate and 0.1 parts of DBTDL.

6. The environmentally friendly foam according to claim 1, characterized in that: The environmentally friendly foam comprises the following components by weight: 70 parts of hydroxyl-terminated PU resin, 30 parts of HDI trimer and 5 parts of m401.

7. The environmentally friendly foam according to claim 1, characterized in that: The hydroxyl-terminated PU resin includes the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

8. The environmentally friendly foam according to claim 1, characterized in that: The environmentally friendly foam comprises the following components by weight: 65 parts of hydroxyl-terminated PU resin, 35 parts of HDI trimer and 4 parts of m401.

9. The environmentally friendly foam according to claim 1, characterized in that: The hydroxyl-terminated PU resin includes the following components by weight: 30 parts of HDI, 40 parts of polyether polyol N-220, 20 parts of polyether polyol 330N, 15 parts of DEG, 0.05 parts of stannous octoate and 0.05 parts of DBTDL.

10. The environmentally friendly foam according to claim 1, characterized in that: The preparation method of the environmentally friendly foam comprises the following steps: taking a preset proportion of hydroxyl-terminated PU resin, HDI trimer and m401, stirring them evenly, and then performing a decompression degassing treatment to obtain a mixture; then pouring the above mixture into a preset mold, treating it at 120° C. for a preset time, and then discharging the material to obtain the environmentally friendly foam.

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