Combined polyether and its preparation method, method for preparing an environment-friendly high-temperature resistant and baking-resistant strongly adhesive polyurethane board using the same

Abstract

The present invention relates to the field of polyurethane chemical synthesis, and particularly relates to a combined polyether and its preparation method, and a method for preparing an environment-friendly high-temperature resistant, bake-resistant and strongly adhesive polyurethane board using the same. The combined polyether described in the present invention comprises the following components in mass fractions: 50-60 parts of polyether polyol A, 20-30 parts of polyether polyol B, 10 parts of special polyether 1; 10 parts of special polyether 2; 1-2 parts of foam stabilizer, 7-8 parts of water, and 3-4.5 parts of catalyst. The blowing agent used is all water, which is environment-friendly, with an ozone depletion potential (ODP) of 0 and the lowest greenhouse effect value at present. The combined polyether of the present invention adopts a special formula system (special polyether, unconventional silicone oil, special emulsifier, etc.) to improve the temperature resistance, bake resistance, adhesiveness and sound insulation of polyurethane boards.

Description

Technical Field

[0001] The present invention relates to the field of polyurethane chemical synthesis, and particularly relates to a combined polyether and a preparation method thereof, and a method for preparing an environment-friendly high-temperature resistant and baking-resistant strongly adhesive polyurethane board by using the same. Background Art

[0002] Polyurethane foam plastics are high molecular polymers formed by chemical reactions of polyols (polyether or polyester polyols) and isocyanates as main raw materials under the action of many additives such as surfactants, catalysts, and blowing agents.

[0003] Polyurethane boards are an important application field of polyurethanes. The production methods mainly include batch type and continuous type. The continuous type is suitable for producing exterior wall and cold storage boards with single structure and large quantity, and the batch type is suitable for producing boards with complex structures and special-shaped parts such as hooks and lock cores. However, in some high-end application fields, such as villa doors, KTV sound insulation doors, and high-end anti-theft doors, not only heat preservation and sound insulation are required, but also the boards need to be baked multiple times after the boards are prepared, so as to color and spray paint the boards. The baking temperature is 200-300 °C, the number of baking times is more than 4 times, and the baking time for each time exceeds 120 min. As is well known, ordinary rigid polyurethane foams have good heat preservation performance, but their sound insulation, especially heat resistance, is poor. When facing baking, problems such as bulging and shelling will occur. Therefore, new inventions and products are urgently needed to solve the above problems.

[0004] In addition, common blowing agents for polyurethane foams include HCFCs, HFCs, C5s, HFOs, etc. However, each has its own advantages and disadvantages. HCFC-141b will damage the ozone layer and has a high global warming potential, and is facing elimination; HFCs have a relatively high global warming potential and are relatively expensive; C5s are flammable, explosive and relatively dangerous; HFOs are too expensive and have not been widely promoted and used in large quantities at present. Water is the most ideal blowing agent, which is safe and environmentally friendly. However, water foaming also has defects: poor foam adhesion, low strength, poor dimensional stability, poor heat preservation performance, etc., and the formula needs to be carefully adjusted and designed. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an environment-friendly high-temperature resistant and baking-resistant strongly adhesive combined polyether. The combined polyether is an environment-friendly (all-water foaming system) combined polyether, and the raw materials of the combined polyether are easy to obtain and environmentally friendly; the present invention also provides a preparation method of the combined polyether, which is scientific, reasonable, simple and feasible; the present invention also provides a method for preparing a polyurethane board by using the combined polyether, the method is simple and feasible, suitable for industrial production, and the prepared polyurethane board has excellent heat resistance, baking resistance, adhesiveness and sound insulation.

[0006] The combined polyether described in the present invention comprises the following components in mass fractions:

[0007]

[0008]

[0009] Wherein:

[0010] The polyether polyol A is a polyether polyol with a hydroxyl value of 295 - 325 mg KOH / g, a functionality of 3.5 - 4.5, a viscosity of 1150 - 1750 mPa·s at 25°C, a water content of less than 0.20 wt%, and is preferably the polyether polyol Donol R8310 produced by Shanghai Dongda Chemical Co., Ltd.

[0011] The polyether polyol B is a polyether polyol with a hydroxyl value of 26 - 30 mg KOH / g, a functionality of 3, a viscosity of 1100 - 1600 mPa·s at 25°C, a water content of less than 0.05 wt%, and is preferably the polyether polyol SEP - 360N produced by Wudi Dexin Chemical Co., Ltd.

[0012] The special polyether 1 is the special polyether Donol 3054E produced by Shanghai Dongda Chemical Co., Ltd., with a hydroxyl value of 52 - 56 mg KOH / g, a functionality of 3, a viscosity of 400 - 600 mPa·s at 25°C, and a water content of less than 0.05 wt%.

[0013] The special polyether 2 is the special polyether CA - 12 produced by Shanghai Dongda Chemical Co., Ltd., with a hydroxyl value of 66 - 86 mg KOH / g, a viscosity of 200 - 300 mPa·s at 25°C, and a water content of less than 0.20 wt%.

[0014] The foam stabilizer is the open - cell silicone oil M - 6628LV produced by Jiangsu MSD Chemical Co., Ltd., with a viscosity of 500 - 800 mPa·s at 25°C, a specific gravity of 1.00 - 1.04 g / ml at 25°C, and a water content of less than 0.30 wt%.

[0015] In some embodiments, water is preferably deionized water.

[0016] In some embodiments, the catalyst is a catalyst conventionally used in the art. In some specific embodiments, the catalyst is an amine catalyst or an organometallic catalyst, including N,N - dimethylcyclohexylamine, N,N - dimethylbenzylamine, potassium isooctanoate K - 15, and quaternary ammonium salt catalyst TMR - 2.

[0017] In some specific embodiments, the catalyst is a composite catalyst comprising N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, potassium isooctanoate K-15, and quaternary ammonium salt catalyst TMR-2, wherein the mass ratio of N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, potassium isooctanoate K-15, and quaternary ammonium salt catalyst TMR-2 is (0.4 - 0.5):(2.0 - 3.0):(0.4 - 0.6):(0.2 - 0.4).

[0018] The method for preparing the combined polyether of the present invention comprises the following steps: pouring the components of the above-mentioned combined polyether into a container and mixing them evenly.

[0019] In some embodiments, pouring the components of the above-mentioned combined polyether into a container and mixing them evenly includes stirring the components of the polyether at a rotation speed of 400 - 600 r / min for 0.6 - 1.2 h under the condition of 15 - 30 °C.

[0020] The method for preparing an environment-friendly high-temperature resistant, bake-resistant, and strongly adhesive polyurethane board using the combined polyether of the present invention comprises the following steps:

[0021] Putting the isocyanate and the combined polyether into a container and mixing them evenly, then injecting them into a preheated molding cavity, then pressing and curing for a period of time, and taking out the polyurethane board from the laminator. After putting the prepared polyurethane board in a curing room at 15 - 25 °C for curing for a period of time, then repeatedly performing high-temperature baking and painting to obtain the environment-friendly high-temperature resistant, bake-resistant, and strongly adhesive polyurethane board.

[0022] Among them:

[0023] The mass ratio of the combined polyether and the isocyanate is 1:(1.4 - 1.6).

[0024] The isocyanate is diphenylmethane diisocyanate, preferably PM200 produced by Wanhua Chemical Group Co., Ltd., with a viscosity of 200 mPa·s and an -NCO content of 30.4 - 32%.

[0025] The temperature range in the molding cavity is 45 - 55 °C.

[0026] The temperature range for the high-temperature baking and painting is 200 - 300 °C.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] (1) The blowing agent used in the combined polyether of the present invention is all water, which is environment-friendly, with an ozone depletion potential (ODP) of 0 and the lowest greenhouse effect value at present.

[0029] (2) The combined polyether of the present invention adopts a special formulation system (special polyether, unconventional silicone oil, special emulsifier, etc.) to improve the temperature resistance, baking resistance, adhesiveness and sound insulation of polyurethane plates.

[0030] (3) The polyether polyol B used in the present invention is a polyether polyol capped with EO, which has high activity and can increase the open-cell rate of polyurethane boards.

[0031] (4) The special polyether polyol 1 used in the present invention is a polyether blended with PO and EO, which has strong open-cell properties and can also improve the bonding problem.

[0032] (5) The special polyether polyol 2 used in the present invention has super emulsifying properties, solves the miscibility problem of the common use of soft foam polyether and hard foam polyether, and at the same time improves the bonding phenomenon.

[0033] (6) The foam stabilizer used in the present invention is a special silicone oil, which has strong open-cell properties and foam stabilizing properties. Detailed implementation mode

[0034] Unless otherwise specified, implied from the context or in accordance with the convention of the prior art, all parts and percentages in this application are based on weight, and the test and characterization methods used are synchronized with the filing date of this application. Where applicable, any patents, patent applications or published content referred to in this application are incorporated herein by reference in their entirety, and their equivalent family patents are also incorporated by reference, especially the definitions of synthetic techniques, products and processing designs, polymers, comonomers, initiators or catalysts in the art disclosed in these documents. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall prevail.

[0035] The numerical ranges in this application are approximate values, so unless otherwise stated, they may include values outside the ranges. The numerical ranges include all values from the lower limit value to the upper limit value increased by 1 unit, provided that there is an interval of at least 2 units between any lower value and any higher value. For example, if it is stated that a component, physical or other property (such as molecular weight, melt index, etc.) is from 100 to 1000, it means that all individual values such as 100, 101, 102, etc. are clearly listed, as well as all sub-ranges such as 100 to 166, 155 to 170, 198 to 200, etc. For ranges containing values less than 1 or fractions greater than 1 (such as 1.1, 1.5, etc.), 1 unit is appropriately regarded as 0.0001, 0.001, 0.01 or 0.1. For ranges of single-digit numbers less than 10 (such as 1 to 5), 1 unit is usually regarded as 0.1. These are just specific examples of what is intended to be expressed, and all possible combinations of the values between the lowest and highest values listed are considered to be clearly recorded in this application.

[0036] When referring to the use of chemical compounds, unless explicitly stated, the singular includes all isomeric forms, and vice versa (e.g., "hexane" includes all isomers of hexane individually or collectively). Additionally, unless explicitly stated, nouns described by "a", "an" or "the" also include their plural forms.

[0037] The terms "comprising", "including", "having" and their derivatives do not exclude the existence of any other components, steps or processes, and are independent of whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, unless explicitly stated, all compositions using the terms "comprising", "including", or "having" in this application may contain any additional additives, excipients or compounds. In contrast, the term "consisting essentially of" excludes any other components, steps or processes from the scope described below any such term, except for those necessary for the operating performance. The term "consisting of" does not include any components, steps or processes not specifically described or listed. Unless explicitly stated, the term "or" refers to the individual members listed or any combination thereof.

[0038] Term Definitions

[0039] GB6343-1995

[0040] National Standard for the Determination of Apparent (Volume) Density of Cellular Plastics and Rubbers

[0041] This standard specifies the test methods for the apparent (volume) density of cellular plastics and rubbers.

[0042] This standard is applicable to the determination of the apparent total density and apparent core density of rigid foam plastics, and the bulk density of semi-rigid, flexible foam plastics and rubbers.

[0043] GB8813-2008

[0044] National Standard for Test Method of Compressive Strength of Rigid Foam Plastics

[0045] This standard specifies the methods for determining the compressive strength and its relative deformation of rigid foam plastics, the compressive stress and compressive elastic modulus at a relative deformation of 10%.

[0046] GB8811-2008

[0047] National Standard for Test Method of Dimensional Stability of Rigid Foam Plastics

[0048] This standard specifies the method for determining the dimensional stability of rigid foam plastics under specific temperature and relative humidity conditions.

[0049] This standard is applicable to the determination of the dimensional stability of rigid foam plastics.

[0050] GB / T 8624-2012

[0051] National Standard for Classification of Combustion Performance of Building Materials and Products

[0052] This standard specifies the terms and definitions, combustion performance grades, criteria for combustion performance grades, identification of combustion performance grades and test reports of building materials and products.

[0053] This standard is applicable to the classification and determination of the combustion performance of building materials, decorative and finishing materials and products used in construction projects.

[0054] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Unless otherwise specified, the reagents and raw materials used can be purchased through commercial channels. For the experimental methods without specific conditions indicated in the following embodiments, they are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0055] In the following embodiments, the sources of the respective raw materials used are as follows:

[0056] Polyether polyol Donol R8310, purchased from Shanghai Dongda Chemical Co., Ltd.

[0057] Polyether polyol SEP-360N, purchased from Wudi Dexin Chemical Co., Ltd.

[0058] Special polyether Donol 3054E, purchased from Shanghai Dongda Chemical Co., Ltd.

[0059] Special polyether CA-12, purchased from Shanghai Dongda Chemical Co., Ltd.

[0060] Special silicone oil M-6628LV, purchased from Jiangsu Mest Chemical Co., Ltd.

[0061] Polyurethane composite catalysts N,N-dimethylcyclohexylamine, N,N-dimethylbenzylamine, potassium isooctanoate K-15, and quaternary ammonium salt catalyst TMR-2, purchased from Air Products and Chemicals, Inc.

[0062] Diphenylmethane diisocyanate, purchased from Wanhua Chemical Group Co., Ltd., model PM200.

[0063] In the following examples, the high-temperature resistant, bake-resistant, and strongly adhesive polyurethane board is prepared by the following method:

[0064] (1) Preparation of combined polyether

[0065] Pour each component of the combined polyether into a container according to the specified ratio, and stir at a speed of 400 - 600 r / min for 0.6 - 1.2 h at 15 - 30 °C to mix evenly.

[0066] (2) Preparation of polyurethane block foam

[0067] Add isocyanate to the container in proportion, mix evenly with the combined polyether, then inject it into a preheated mold cavity at 45 - 55 °C, and then press and cure for a period of time. Take out the polyurethane board from the laminator. After the prepared polyurethane board is cured in a curing room at 15 - 25 °C for a period of time, it is then repeatedly baked and painted at high temperature to make the finished board. Among them, the mass ratio of the combined polyether to the isocyanate is 1:1.4 - 1.6.

[0068]

[0069]

[0070] Table 1

[0071] Example 1

[0072] The mass ratio of each component of the combined polyether in this example is shown in Table 1.

[0073] A preparation method of an environmentally friendly high-temperature resistant, bake-resistant, and strongly adhesive polyurethane board includes the following steps:

[0074] (1) Add 50 parts of polyether polyol Donol R8310, 20 parts of polyether polyol SEP-360N, 10 parts of special polyether Donol3054E, 10 parts of special polyether CA-12, 1 part of open-cell silicone oil M-6628LV, catalysts: 0.4 part of N,N-dimethylcyclohexylamine, 2.0 parts of N,N-dimethylbenzylamine, 0.4 part of K-15, 0.2 part of TMR-2, and 7 parts of water into a stainless steel mixing kettle, stir at a speed of 500 revolutions per minute at room temperature for 1 hour, and discharge to obtain the combined polyether for environmentally friendly high-temperature resistant, baking-resistant and strong-bonding polyurethane boards;

[0075] (2) Under the condition that the material temperature is 22 °C, according to the mass ratio of 1:1.4 of the combined polyether for environmentally friendly high-temperature resistant, baking-resistant and strong-bonding polyurethane boards to isocyanate PM200, accurately measure and mix the materials through a high-pressure machine and then inject the materials into a preheated die-cavity at 50 °C, then carry out press molding and curing for 20 min, take out from the laminator to obtain the polyurethane board. After placing the prepared polyurethane board in a curing room at 20 °C for 20 h, carry out high-temperature baking and painting at 220 °C repeatedly to make the finished board. The physical properties of the foam are shown in Table 2.

[0076] Example 2

[0077] The mass ratio of each component of the combined polyether in this example is shown in Table 1.

[0078] A preparation method of an environmentally friendly high-temperature resistant, baking-resistant and strong-bonding polyurethane board includes the following steps:

[0079] (1) Add 55 parts of polyether polyol Donol R8310, 25 parts of polyether polyol SEP-360N, 10 parts of special polyether Donol3054E, 10 parts of special polyether CA-12, 1.5 parts of open-cell silicone oil M-6628LV, catalysts: 0.5 part of N,N-dimethylcyclohexylamine, 2.5 parts of N,N-dimethylbenzylamine, 0.6 part of K-15, 0.3 part of TMR-2, and 7.5 parts of water into a stainless steel mixing kettle, stir at a speed of 500 revolutions per minute at room temperature for 1 hour, and discharge to obtain the combined polyether for environmentally friendly high-temperature resistant, baking-resistant and strong-bonding polyurethane boards;

[0080] (2) Under the condition that the material temperature is 22 °C, according to the mass ratio of 1:1.5 of the combined polyether for environmentally friendly high-temperature resistant, baking-resistant and strong-bonding polyurethane boards to isocyanate PM200, accurately measure and mix the materials through a high-pressure machine and then inject the materials into a preheated die-cavity at 52 °C, then carry out press molding and curing for 22 min, take out from the laminator to obtain the polyurethane board. After placing the prepared polyurethane board in a curing room at 22 °C for 20 h, carry out high-temperature baking and painting at 250 °C repeatedly to make the finished board. The physical properties of the foam are shown in Table 2.

[0081] Example 3

[0082] The mass ratios of the components of the combined polyether in this embodiment are shown in Table 1.

[0083] A preparation method of an environmentally friendly high-temperature resistant, baking resistant and strongly adhesive polyurethane board comprises the following steps:

[0084] (1) Add 60 parts of polyether polyol Donol R8310, 20 parts of polyether polyol SEP-360N, 10 parts of special polyether Donol3054E, 10 parts of special polyether CA-12, 2 parts of open-cell silicone oil M-6628LV, catalysts: 0.5 part of N,N-dimethylcyclohexylamine, 3 parts of N,N-dimethylbenzylamine, 0.6 part of K-15, 0.4 part of TMR-2, and 8 parts of water into a stainless steel mixing kettle, stir at a speed of 500 revolutions per minute at room temperature for 1 hour, and discharge to obtain the combined polyether for the environmentally friendly high-temperature resistant, baking resistant and strongly adhesive polyurethane board;

[0085] (2) Under the condition that the material temperature is 22 °C, according to the mass ratio of 1:1.6 of the combined polyether for the environmentally friendly high-temperature resistant, baking resistant and strongly adhesive polyurethane board to isocyanate PM200, accurately measure and mix the materials through a high-pressure machine and then inject the materials into a preheated mold cavity at 55 °C, then carry out press molding and curing for 16 min, take out from the laminator to obtain the polyurethane board, place the prepared polyurethane board in a curing room at 18 °C for curing for 24 h, and then repeatedly carry out high-temperature baking and painting at 280 °C to make the finished board. The physical properties of the foam are shown in Table 2.

[0086] Comparative Example 1

[0087] A preparation method of a polyurethane board comprises the following steps:

[0088] (1) Add 50 parts of polyether polyol Donol R8310, 50 parts of polyether polyol SEP-360N, 1 part of open-cell silicone oil M-6628LV, catalysts: 0.4 part of N,N-dimethylcyclohexylamine, 2 parts of N,N-dimethylbenzylamine, 0.4 part of K-15, 0.2 part of TMR-2, and 7 parts of water into a stainless steel mixing kettle, stir at a speed of 500 revolutions per minute at room temperature for 1 hour, and discharge to obtain the combined polyether for the environmentally friendly high-temperature resistant, baking resistant and strongly adhesive polyurethane board;

[0089] (2) Under the condition that the material temperature is 22 °C, according to the mass ratio of 1:1.4 of the combined polyether for the environmentally friendly high-temperature resistant, baking resistant and strongly adhesive polyurethane board to isocyanate PM200, accurately measure and mix the materials through a high-pressure machine and then inject the materials into a preheated mold cavity at 50 °C, then carry out press molding and curing for 20 min, take out from the laminator to obtain the polyurethane board, place the prepared polyurethane board in a curing room at 20 °C for curing for 20 h, and then repeatedly carry out high-temperature baking and painting at 220 °C to make the finished board. The physical properties of the foam are shown in Table 2.

[0090] Comparative Example 2

[0091] A preparation method of a polyurethane board, comprising the following steps:

[0092] (1) Add 55 parts of polyether polyol Donol R8310, 25 parts of polyether polyol SEP-360N, 10 parts of special polyether Donol3054E, 10 parts of special polyether CA-12, 1.5 parts of open-cell silicone oil L-580, catalysts: 0.5 part of N,N-dimethylcyclohexylamine, 3.0 parts of N,N-dimethylbenzylamine, 0.6 part of K-15, 0.4 part of TMR-2, and 7.5 parts of water into a stainless steel mixing kettle, stir at a speed of 500 revolutions per minute for 1 hour at room temperature, and discharge to obtain a combined polyether for an environmentally friendly high-temperature resistant, baking resistant, and strongly adhesive polyurethane board;

[0093] (2) Under the condition that the material temperature is 22 °C, according to the mass ratio of 1:1.5 of the combined polyether for the environmentally friendly high-temperature resistant, baking resistant, and strongly adhesive polyurethane board to isocyanate PM200, accurately measure and mix the materials through a high-pressure machine, then inject the materials into a preheated die pressing cavity at 55 °C, then press and cure for 16 min, take out from the laminator to obtain a polyurethane board, place the prepared polyurethane board in a curing room at 18 °C for 24 h, and then repeatedly perform high-temperature baking and painting at 280 °C to make a finished board. The physical properties of the foam are shown in Table 2.

[0094] Effect examples

[0095] Perform effect tests on the polyurethane boards made in Examples 1 to 3 and Comparative Examples 1 to 2, and the test results are shown in Table 2 below.

[0096]

[0097] Table 2

[0098] Note: When testing the bonding strength, the fracture surfaces of the boards in Examples 1-3 and Comparative Example 2 are both foam layers, and there is no debonding between the foam and the substrate surface; for Comparative Example 1, when testing the bonding strength, the foam and the substrate surface are debonded.

[0099] As can be seen from Table 2, for the environmentally friendly high-temperature resistant, baking resistant, and strongly adhesive polyurethane board prepared according to the implementation manner of the present application, when the core density is only 25 kg / m 3 , the vertical compressive strength of the foam reaches more than 120 kPa, the parallel compressive strength is about 85 kPa, the high-temperature dimensional change rate at 100 °C for 24 hours is less than 0.20%, the low-temperature dimensional change rate at -30 °C for 24 hours is less than 0.10%, the bonding strength is about 120 kPa (the fracture surface is the foam layer, and there is no fracture between the foam and the substrate surface), the open-cell rate is 60%-70%, it can achieve a good sound insulation effect, and there is no bulging, no deformation, and no debonding after repeated high-temperature baking and painting at 200-300 °C.

[0100] All raw materials used in this application are commercially available raw materials with a wide range of sources, enabling large-scale production.

[0101] The above description of the embodiments is intended to enable those of ordinary skill in the art to understand and apply this application. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, this application is not limited to the embodiments herein, and all improvements and modifications made by those skilled in the art based on the content disclosed in this application without departing from the scope and spirit of this application are within the scope of this application.

Claims

1. A combined polyether, characterized in that, Comprising the following components in parts by mass: Polyether polyol A: 50 - 60 parts; Polyether polyol B: 20 - 30 parts; Special polyether 1: 10 parts; Special polyether 2: 10 parts; Foam stabilizer: 1 - 2 parts; Water: 7 - 8 parts; Catalyst: 3 - 5 parts; The hydroxyl value of the polyether polyol A is 295 - 325 mgKOH / g, the functionality is 3.5 - 4.5, and the viscosity at 25 °C is 1150 - 1750 mPa·s; the polyether polyol A is Donol R8310; The hydroxyl value of the polyether polyol B is 26 - 30 mgKOH / g, the functionality is 3, and the viscosity at 25 °C is 1100 - 1600 mPa·s; the polyether polyol B is SEP - 360N; The hydroxyl value of the special polyether 1 is 52 - 56 mgKOH / g, the functionality is 3, and the viscosity at 25 °C is 400 - 600 mPa·s; the special polyether 1 is Donol 3054E; The hydroxyl value of the special polyether 2 is 66 - 86 mgKOH / g, and the viscosity at 25 °C is 200 - 300 mPa·s; the special polyether 2 is CA - 12; The foam stabilizer is open - cell silicone oil M - 6628LV.

2. The combined polyether according to claim 1, characterized in that, The catalyst is one or two of amine catalysts or organometallic catalysts.

3. The combined polyether according to claim 2, characterized in that, The catalyst is a mixture of N,N - dimethylcyclohexylamine, N,N - dimethylbenzylamine, potassium isooctanoate K - 15, and quaternary ammonium salt catalyst TMR - 2. The mass ratio of N,N - dimethylcyclohexylamine, N,N - dimethylbenzylamine, potassium isooctanoate K - 15 to quaternary ammonium salt catalyst TMR - 2 is (0.4 - 0.5):(2.0 - 3.0):(0.4 - 0.6):(0.2 - 0.4).

4. A preparation method of the combined polyether according to any one of claims 1 to 3, characterized in that, Pour the components of the combined polyether into a container and mix evenly.

5. A method for preparing an environment-friendly high-temperature resistant, baking-resistant and strongly adhesive polyurethane board by using the combined polyether according to any one of claims 1 to 3, characterized in that, Including the following steps: After putting the isocyanate and the combined polyether into a container and mixing evenly, inject them into a pre - heated molding cavity, then carry out press - molding and curing, and take out from the laminator to obtain a polyurethane board. After curing the prepared polyurethane board in a curing room at 15 - 25 °C, then carry out high - temperature baking and painting to obtain an environmentally friendly high - temperature - resistant, bake - resistant, and strongly adhesive polyurethane board.

6. The method for preparing an environment-friendly high-temperature resistant, baking-resistant and strongly adhesive polyurethane board by using the combined polyether according to claim 5, characterized in that, The mass ratio of the combined polyether to the isocyanate is 1:(1.4 - 1.6).

7. The method for preparing an environment-friendly high-temperature resistant, baking-resistant and strongly adhesive polyurethane board by using the combined polyether according to claim 5, characterized in that, The isocyanate is diphenylmethane diisocyanate.

8. The method for preparing an environment-friendly high-temperature resistant, baking-resistant and strongly adhesive polyurethane board by using the combined polyether according to claim 5, characterized in that, The pre - heating temperature range in the molding cavity is 45 - 55 °C.

9. The method for preparing an environment-friendly high-temperature resistant, baking-resistant and strongly adhesive polyurethane board by using the combined polyether according to claim 5, characterized in that, The high - temperature baking and painting temperature is 200 - 300 °C.

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