Preparation method of foaming material, foaming material and refrigeration equipment

Abstract

The invention provides a preparation method of a foaming material, the foaming material and refrigeration equipment, and the preparation method of the foaming material comprises the following steps: providing a first component containing modified polyether polyol, polyether polyol, a first foaming agent and an auxiliary agent; providing a second component comprising an isocyanate and a second blowing agent; mixing the first component and the second component, and foaming to obtain a foaming material; the preparation method of the modified polyether polyol comprises the following steps: mixing an initiator, an epoxy compound and a catalyst to obtain an intermediate; and mixing the intermediate with a first silane coupling agent to obtain the modified polyether polyol. Therefore, the compatibility with a foaming agent is improved, and the low-temperature shrinkage resistance of the foaming material can be enhanced.

Description

Technical Field

[0001] This application relates to the field of polyurethane foaming technology, specifically to a method for preparing a foaming material, the foaming material itself, and a refrigeration device. Background Technology

[0002] During the preparation of polyurethane foam materials, the lack of low-temperature resistant functional groups in polyol molecules causes the foaming agent to escape, resulting in an increased deformation rate of the foam material at -30℃. This leads to the separation of the refrigerator insulation layer from the inner liner foam, resulting in a decrease in the refrigerator's insulation performance. Summary of the Invention

[0003] The embodiments of this application provide a method for preparing a foamed material, the foamed material itself, and a refrigeration device, which can improve the technical problem of foaming agent escaping.

[0004] In a first aspect, embodiments of this application provide a method for preparing a foamed material, comprising the following steps: Provides a first component comprising modified polyether polyol, polyether polyol, a first blowing agent and additives; A second component comprising isocyanate and a second blowing agent is provided; The first component and the second component are mixed and foamed to obtain a foamed material; The preparation method of the modified polyether polyol includes the following steps: A polyol initiator, an epoxide compound, and a basic catalyst are mixed to obtain an intermediate. The intermediate is mixed with a first silane coupling agent to obtain a modified polyether polyol.

[0005] Secondly, embodiments of this application provide a foaming material prepared using the foaming material preparation method described above.

[0006] Thirdly, embodiments of this application provide a refrigeration device, including a foamed material prepared by the foamed material preparation method described above, or including a foamed material as described above.

[0007] The beneficial effects of the embodiments of this application are as follows: In the embodiments of this application, a polyether polyol is obtained by reacting a first silane coupling agent with an intermediate. Its molecular structure can improve the compatibility with the foaming agent and enhance the low-temperature shrinkage resistance of the foaming material. Detailed Implementation

[0008] The technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Furthermore, it should be understood that the specific implementation methods described herein are only for illustration and explanation of this application and are not intended to limit this application.

[0009] In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in its actual use or operating state, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device. Furthermore, in the description of this application, the term "comprising" means "including but not limited to". The terms first, second, third, etc., are used merely as illustrative purposes and do not impose numerical requirements or establish a numerical order.

[0010] In this application, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0011] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, "at least one of a, b, or c," or "at least one of a, b, and c," can both mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple.

[0012] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the referred range.

[0013] The technical solution of this application is as follows: In a first aspect, embodiments of this application provide a method for preparing a foamed material, comprising the following steps: Provides a first component comprising modified polyether polyol, polyether polyol, a first blowing agent and additives; A second component comprising isocyanate and a second blowing agent is provided; The first component and the second component are mixed and foamed to obtain a foamed material; The preparation method of the modified polyether polyol includes the following steps: The initiator, epoxide, and catalyst are mixed to obtain an intermediate; The intermediate is mixed with a first silane coupling agent to obtain a modified polyether polyol.

[0014] It should be noted that a catalyst is a type of substance that can provide basic active sites and accelerate chemical reactions by accepting protons or donating lone pairs of electrons.

[0015] Epoxy compounds refer to a class of compounds whose molecules contain ternary epoxy ether bonds (forming a triangular ring structure).

[0016] It is understandable that by first preparing polyether polyols, i.e. intermediates, by reacting polyols and epoxy compounds with an alkaline catalyst, the resulting modified polyether polyols have -Si-O-alkyl segments, which improves compatibility with the first blowing agent, reduces the escape of the first blowing agent, increases the utilization rate of the blowing agent, and also enhances the low-temperature shrinkage resistance of the foamed material.

[0017] In some examples, the catalyst is selected from KOH. The epoxide is selected from one or more of ethylene oxide and propylene oxide.

[0018] In some specific embodiments, the preparation method of the modified polyether polyol includes the following steps: A polyol, an epoxy compound, and 0.1–0.3 parts of an alkaline catalyst are mixed to obtain an intermediate. The intermediate is mixed with a first silane coupling agent and reacted at 80-100°C for 3-4 hours to obtain a modified polyether polyol. The polyols include sucrose and glycerol in a molar ratio of 1:0.8.

[0019] In some embodiments, the first component comprises 40-60 parts by weight of modified polyether polyol, 30-50 parts by weight of polyether polyol, additives, and 8-12 parts by weight of a first blowing agent; and / or, The mass ratio of the first silane coupling agent to the intermediate is (0.05~0.15):1; and / or, The initiator is selected from one or more of sucrose (CAS: 77-50-1), glycerol (CAS: 56-81-5), pentaerythritol (CAS: 115-77-5), sorbitol (CAS: 50-70-4), xylitol (CAS: 77-99-0), and mannitol (CAS: 69-65-8); and / or, The first silane coupling agent is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane (KH560), β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (KH-460), γ-methacryloyloxypropyltrimethoxysilane (KH570), and 3-glycidoxypropyltriethoxysilane (A-187).

[0020] Understandably, by controlling the proportions of the materials in the first component as described above, the modified polyether polyol can better integrate with other materials. Furthermore, conventional polyether polyols are added alongside the modified polyether polyol to balance the brittleness of the siloxane segments in the modified polyether polyol, improve material flowability, and thus facilitate the production of a foamed material with good cell uniformity.

[0021] The aforementioned polyols can be used alone or in combination, allowing the hydroxyl functionality and reactivity of the polyols to be better suited for ring-opening polymerization of epoxides. For example, when used alone, the polyol is selected from pentaerythritol, sorbitol, xylitol, or mannitol; when used in pairs, they can be sucrose and glycerol, sucrose and pentaerythritol, glycerol and sorbitol, or xylitol and mannitol.

[0022] The aforementioned first silane coupling agents can all provide siloxane segments, which can then react with intermediates to obtain segments with improved compatibility with the first blowing agent.

[0023] In some examples, the number of parts of the modified polyether polyol may also be selected from any of the following values ​​or a range between any two of the following values: 40 parts, 45 parts, 50 parts, 55 parts, 60 parts. The number of parts of the polyether polyol may also be selected from any of the following values ​​or a range between any two of the following values: 30 parts, 35 parts, 40 parts, 45 parts, 50 parts. The number of parts of the first blowing agent may also be selected from any of the following values ​​or a range between any two of the following values: 8 parts, 9 parts, 10 parts, 11 parts, 12 parts.

[0024] The mass ratio of the first silane coupling agent to the intermediate can also be selected from any of the following ratios or a range between any two of the following ratios: 0.05:1, 0.06:1, 0.07:1, 0.08:1, 0.09:1, 0.1:1, 0.11:1, 0.12:1, 0.13:1, 0.14:1, 0.15:1.

[0025] In some embodiments, the additive includes a second silane coupling agent having an amino group and an alkoxysilane group.

[0026] It is understood that the second silane coupling agent in this embodiment is different from the first silane coupling agent in other embodiments. The second silane coupling agent in this embodiment, which has amino and alkoxy groups, can react with isocyanate to form urea silane bonds, and the alkoxy groups can be hydrolyzed and condensed with hydroxyl groups to achieve synergistic chemical bonding and physical adsorption. At the same time, it can crosslink with the siloxane segments on the modified polyether polyol to further enhance the low-temperature dimensional stability.

[0027] In some embodiments, the adjuvant comprises 0.5 to 2.0 parts of the second silane coupling agent; and / or, The second silane coupling agent is selected from one or more of 3-aminopropyltriethoxysilane (APTES, CAS: 919-30-2), γ-aminopropyltrimethoxysilane (KH550, CAS: 18822-66-5), N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (KH792, CAS: 1660-44-3), and γ-glycidoxypropyltrimethoxysilane (KH560, CAS: 2330-83-8).

[0028] Understandably, by controlling the second silane coupling agent within the aforementioned proportion range, bonding with other materials can be successfully achieved, while avoiding the adverse effects of excessive addition. The selected second silane coupling agents all provide amino and alkoxy groups and can be well mixed and compounded with other materials.

[0029] In some examples, the number of parts of the second silane coupling agent may also be selected from any of the following values ​​or a range between any two of the following values: 0.5 parts, 1 part, 1.5 parts, 2 parts.

[0030] In some embodiments, after the step of providing the first component and before the step of mixing the first component with the second component, the step of maintaining the temperature of the first component at a first temperature is further included. After the step of providing the second component and before the step of mixing the first component with the second component, the method further includes the step of maintaining the temperature of the second component at a second temperature. Wherein, the first temperature is different from the second temperature, the first foaming agent is liquid at the first temperature, the second foaming agent is liquid at the second temperature, the first foaming agent includes silane foaming agents, and the second foaming agent includes hydrofluoroene foaming agents.

[0031] It should be noted that the first temperature is used to represent a specific temperature value or a temperature range. The second temperature is also used to represent a specific temperature value or a temperature range. The first temperature and the second temperature differ in that: one temperature value is not within the temperature range of the other, or the two temperature values ​​are different, or the two temperature ranges do not overlap.

[0032] The first temperature allows the first foaming agent to remain in a liquid state, and the second temperature allows the second foaming agent to remain in a liquid state.

[0033] Understandably, the first and second foaming agents in the first and second components have different boiling points. By maintaining the first component at a first temperature and the second component at a second temperature, during foaming, the low-boiling-point foaming agent slowly vaporizes first at the low temperature stage, providing initial support for the cells. At this point, the cell walls are just cross-linked, and a small amount of gas cannot easily form the cell structure, avoiding the problem of instantaneous gas generation and gas escape when using a single low-boiling-point foaming agent. In the intermediate temperature stage, the high-boiling-point foaming agent gradually vaporizes, replenishing the gas pressure within the cells, maintaining the cell expansion shape, and continuously improving the cell wall strength. This solves the defects of insufficient gas generation and cell collapse at low temperatures when using a single high-boiling-point foaming agent. Under the combined action of the first and second foaming agents, a foamed material with uniform pore size and high closed-cell ratio is obtained. Furthermore, the first foaming agent, which includes a silane-based foaming agent in the first component, has a polarity similar to or the same as that of other materials. The second foaming agent, which includes a hydrofluoroene-based foaming agent in the second component, and the isocyanate are both highly polar materials. Therefore, after the first and second components are mixed, the first and second foaming agents will undergo phase separation, which avoids the random distribution of foaming agents with different boiling points caused by homogeneous dissolution, and better obtains foamed materials with uniform pore size.

[0034] In some embodiments, the boiling point difference between the first foaming agent and the second foaming agent is not less than 30°C; optionally, the boiling point difference between the first foaming agent and the second foaming agent is not greater than 60°C; and / or, The first blowing agent is selected from one or more of tetramethylsilane (CAS: 55-66-3), hexamethyldisiloxane (CAS: 107-46-0), methyltriethoxysilane (CAS: 2031-67-6), and dimethyldimethoxysilane (CAS: 1112-39-6); the second blowing agent is selected from one or more of trans-1,1,1,4,4,4-hexafluoro-2-butene (CAS: 690-39-1), 1-chloro-3,3,3-trifluoropropene (CAS: 102687-65-0), and trifluoropropene (HFO-1123, CAS: 599-11-5).

[0035] Understandably, controlling the boiling point difference between the first and second foaming agents within the above range results in better uniformity of the foamed material's pore size.

[0036] In some examples, the difference in boiling points between the first foaming agent and the second foaming agent may also be selected from any of the following values ​​or a range between any two of the following values: 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C.

[0037] In some examples, the first temperature is 28~35℃ and the second temperature is 10~15℃.

[0038] It is understandable that when the first and second foaming agents are selected from the above-mentioned materials, the temperature can be controlled within the above-mentioned range so that the foaming agent remains in a liquid state and avoids condensation or vaporization.

[0039] In some embodiments, the second component comprises 130-160 parts of isocyanate and 5-8 parts of a second blowing agent; and / or, In the step of obtaining the foamed material, 100 parts of the first component are mixed with 130 to 160 parts of the second component.

[0040] Understandably, by selecting the proportions within the aforementioned range, better foaming with the first foaming agent can be achieved, resulting in a foamed material with uniform cell structure. Isocyanates can better facilitate gelation and foaming reactions.

[0041] In some examples, the number of parts of isocyanate may also be selected from any of the following values ​​or a range between any two of the following values: 130 parts, 135 parts, 140 parts, 145 parts, 150 parts, 155 parts, 160 parts. The number of parts of the second blowing agent may also be selected from any of the following values ​​or a range between any two of the following values: 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts.

[0042] In some embodiments, the step of obtaining the foamed material specifically includes: 100 parts of the first component and 130-160 parts of the second component are injected into a mold, the mold temperature is controlled at 38-42°C, the overfilling coefficient is 110-130%, and the foamed material is obtained by demolding. Understandably, under the above reaction conditions, sufficient foaming will result in foamed materials with better performance.

[0043] In some embodiments, the additives include a catalyst, a foam stabilizer, and 0.8 to 1.5 parts of water.

[0044] Understandably, the catalyst catalyzes the reaction. The foam stabilizer stabilizes the cell structure and prevents cell collapse. Water participates in the foaming reaction. The catalyst and foam stabilizer can be adjusted according to the actual material used. In some examples, the amount of water can also be selected from any of the following values ​​or a range between any two of the following values: 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts.

[0045] In some embodiments, the catalyst comprises a foaming catalyst and a gel catalyst in a mass ratio of 1:2; optionally, the foaming catalyst is selected from one or more of pentamethyldiethylenetriamine (PMDETA, CAS: 3030-47-5), triethylenediamine (DABCO, CAS: 280-57-9), N,N,N',N'-tetramethylethylenediamine (TMEDA, CAS: 110-18-9), and N,N,N',N'',N''-pentamethyldipropylenetriamine (PMDETA, CAS: 38667-60-4); optionally, the gel catalyst is selected from one or more of N,N-dimethylcyclohexylamine (CAS: 91-65-6), N,N-dimethylbenzylamine (BDMA, CAS: 103-83-3), and 1,4-diazabicyclo[2.2.2]octane (DABCO33-LV, CAS: 280-57-9); and / or, The foam stabilizer is selected from Evonik B8462; and / or, The polyether polyol is selected from one or more of the following: Red Power H4110, Red Power H3600, Red Power H4200, and sorbitol-type polyether polyols; and / or, The isocyanate is selected from one or more of PM200 (CAS:9016-77-9), MDI (CAS:101-68-8), and TDI (CAS:584-84-9).

[0046] It should be noted that sorbitol-type polyether polyols refer to multifunctional polyether polyols prepared by ring-opening polymerization of propylene oxide (PO) and ethylene oxide (EO) using D-sorbitol as the initiator.

[0047] It is understandable that foaming catalysts and gel catalysts promote gelation and foaming reactions.

[0048] Secondly, embodiments of this application provide a foaming material, which is prepared using the foaming material preparation method described above.

[0049] Understandably, the foamed material prepared by the above method has a lower low-temperature deformation rate and thermal conductivity, and its bonding strength is significantly improved.

[0050] Thirdly, embodiments of this application provide a refrigeration device, including a foamed material prepared by the foamed material preparation method described above, or including a foamed material as described above.

[0051] In some embodiments, the refrigeration equipment includes a housing, the housing comprising a shell and a liner, the liner being disposed inside the shell, and an insulation layer being provided between the shell and the liner; and / or, The refrigeration equipment includes a door body, which includes a door panel and a door liner spaced apart, and the insulation layer is provided between the door panel and the door liner.

[0052] It is understandable that the inner liner of the refrigeration equipment is difficult to separate from the aforementioned foaming material, thus exhibiting good thermal insulation performance and a long service life.

[0053] Preparation Example 1 This application provides a modified polyether polyol and its preparation method, the preparation method including the following steps: S1. Using sucrose and glycerol in a molar ratio of 1:0.8 as initiators, react with propylene oxide at 0.3~0.5MPa and 0.2 parts KOH catalysis until the hydroxyl value reaches 400~450mgKOH / g, and a polyol is obtained. Then, GPTMS is added and reacted at 90℃ for 4h to obtain modified polyether polyol.

[0054] The mass of GPTMS is 10% of the mass of the polyol.

[0055] Example 1 This application provides a foaming material and a method for preparing the same. The preparation method includes the following steps: S1. Mix 40 parts of modified polyether polyol, 30 parts of H4110, 8 parts of tetramethylsilane, 0.5 parts of 3-aminopropyltriethoxysilane, composite catalyst, 2.5 parts of B8462 and 0.8 parts of water, and control the material temperature at 28℃ to obtain the first component.

[0056] The composite catalyst includes 0.5 parts of pentamethyldiethylenetriamine and 1 part of N,N-dimethylcyclohexylamine.

[0057] S2. Mix 130 parts of PM200 and 5 parts of trans-1,3,3,3-tetrafluoropropylene, and control the material temperature at 10℃ to obtain the second component.

[0058] S3. Mix the first and second components in a high-pressure machine gun head at a mass ratio of 100:130 (pressure 15MPa), inject into a 1100×300×50mm mold, mold temperature 40℃, overfill coefficient 120%, and demold to obtain foamed material.

[0059] Example 2 This application provides a foaming material and its preparation method, which differs from Example 1 in that: Replace step S1 with: mixing 50 parts of modified polyether polyol, 40 parts of H4110, 10 parts of tetramethylsilane, 1 part of 3-aminopropyltriethoxysilane, composite catalyst, 2.5 parts of B8462 and 1.2 parts of water, and controlling the material temperature at 32℃ to obtain the first component.

[0060] Replace step S2 with: mixing 145 parts of PM200 and 6 parts of trans-1,3,3,3-tetrafluoropropylene, controlling the material temperature at 12°C, to obtain the second component.

[0061] Example 3 This application provides a foaming material and its preparation method, which differs from Example 1 in that: Replace step S1 with: mixing 60 parts of modified polyether polyol, 50 parts of H4110, 12 parts of tetramethylsilane, 1.5 parts of 3-aminopropyltriethoxysilane, composite catalyst, 2.5 parts of B8462 and 1.5 parts of water, and controlling the material temperature at 35℃ to obtain the first component.

[0062] Replace step S2 with: mixing 160 parts of PM200 and 8 parts of trans-1,3,3,3-tetrafluoropropylene, controlling the material temperature at 15°C, to obtain the second component.

[0063] Example 4 This application provides a foaming material and its preparation method, which differs from Example 2 in that: In step S1, 10 parts of tetramethylsilane are replaced with 9 parts of tetramethylsilane, and the material temperature is controlled at 30°C.

[0064] Example 5 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace the 6 parts of trans-1,3,3,3-tetrafluoropropylene in step S2 with 5 parts of trans-1,3,3,3-tetrafluoropropylene.

[0065] Example 6 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace the 6 parts of trans-1,3,3,3-tetrafluoropropylene in step S2 with 7 parts of trans-1,3,3,3-tetrafluoropropylene.

[0066] Example 7 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace 1.5 parts of 3-aminopropyltriethoxysilane in step S1 with 0.8 parts of 3-aminopropyltriethoxysilane.

[0067] Example 8 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace 1.5 parts of 3-aminopropyltriethoxysilane in step S1 with 1.2 parts of 3-aminopropyltriethoxysilane.

[0068] Example 9 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace step S1 with: mixing 50 parts of modified polyether polyol, 40 parts of H4110, 16 parts of tetramethylsilane, 1 part of 3-aminopropyltriethoxysilane, composite catalyst, 2.5 parts of B8462 and 1.2 parts of water, and controlling the material temperature at 32℃ to obtain the first component.

[0069] The five parts of trans-1,3,3,3-tetrafluoropropylene in step S2 are omitted.

[0070] Example 10 This application provides a foaming material and its preparation method, which differs from Example 2 in that: Replace step S1 with: mix 50 parts of modified polyether polyol, 40 parts of H4110, 10 parts of tetramethylsilane, composite catalyst, 2.5 parts of B8462 and 1.2 parts of water, and control the material temperature at 32℃ to obtain the first component.

[0071] Example 11 This application provides a foaming material and its preparation method, which differs from Example 2 in that: In step S2, the material temperature is controlled at 32℃.

[0072] Comparative Example 1 This application provides a foaming material and its preparation method as a comparative example, which differs from Example 2 in that: The 40 parts of modified polyether polyol in step S1 are omitted.

[0073]

[0074] Performance testing The foamed materials prepared in Examples 1 to 11 and Comparative Example 1 were tested using the following methods: Low-temperature dimensional deformation rate: The foamed material was cut and polished to 100mm×100mm×50mm and placed at -30℃ and 45~55%RH for 24h, and tested in accordance with GB / T26689-2011.

[0075] Thermal conductivity: The thermal conductivity of the sample at 10℃ was tested in accordance with GB / T10294-2008.

[0076] Bond strength: Refer to GB / T14518-2021, and conduct a peel test on the foam-styrene liner at a peel speed of 50 mm / min.

[0077] Foaming agent utilization rate: Gas chromatography was used. Instrument: Agilent 7890A. Column: HP-5 (30m×0.32mm). Carrier gas: N2 (flow rate 1mL / min). Column temperature: 50℃ (hold for 5min) → 200℃ (heating rate 10℃ / min). The percentage of residual foaming agent after the reaction was determined.

[0078] Cell density range: The cell density range test refers to GB / T6343-2009 "Determination of apparent density of foamed plastics and rubber", and the difference is calculated by taking 5 core measuring points.

[0079] The test results are shown in Table 1.

[0080] Table 1:

[0081] As shown in Table 1: Compared to Comparative Example 1, the foamed materials prepared in Examples 1 to 10 exhibit lower low-temperature deformation rates and lower foaming agent utilization rates. This is because the use of modified polyols improves low-temperature foam retention and material compatibility.

[0082] Compared to Example 9, the foamed material obtained in Example 2 has a lower thermal conductivity and a lower low-temperature deformation rate. This is because the hydrofluoroene foaming agent can synergistically foam with tetramethylsilane.

[0083] Compared with Example 10, the foamed material obtained in Example 2 has a significantly improved bonding strength. This is because 3-aminopropyltriethoxysilane can improve the bonding defects of urea groups.

[0084] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A process for the preparation of a foamed material, characterized in that, The method comprises the following steps: providing a first component comprising a modified polyether polyol, a polyether polyol, a first blowing agent and an auxiliary agent; providing a second component comprising an isocyanate and a second blowing agent; mixing the first component with the second component, foaming to obtain a foamed material; wherein the preparation method of the modified polyether polyol comprises the following steps: mixing a starter, an epoxy compound and a catalyst to obtain an intermediate; mixing the intermediate with a first silane coupling agent to obtain the modified polyether polyol.

2. The process for the preparation of a foamed material according to claim 1, characterized in that, The first component comprises 40-60 parts by weight of the modified polyether polyol, 30-50 parts by weight of the polyether polyol, the auxiliary agent and 8-12 parts by weight of the first blowing agent; and / or, The mass ratio of the first silane coupling agent to the intermediate is (0.05-0.15):1; and / or, The starter is selected from one or more of sucrose, glycerol, pentaerythritol, sorbitol, xylitol, mannitol; and / or, The first silane coupling agent is selected from one or more of γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, 3-glycidoxypropyltriethoxysilane.

3. The process for the preparation of a foamed material according to claim 2, characterized in that, The auxiliary agent comprises a second silane coupling agent, and the second silane coupling agent has an amino group and an alkoxy group.

4. The process for the preparation of a foamed material according to claim 3, characterized in that, The auxiliary agent comprises 0.5-2.0 parts of the second silane coupling agent; and / or, The second silane coupling agent is selected from one or more of 3-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane.

5. The method for preparing the foamed material according to claim 2, characterized in that, After the step of providing the first component and before the step of mixing the first component with the second component, the method further comprises the step of maintaining the temperature of the first component at a first temperature; After the step of providing the second component and before the step of mixing the first component with the second component, the method further comprises the step of maintaining the temperature of the second component at a second temperature; wherein the first temperature is different from the second temperature, the first blowing agent is in a liquid state at the first temperature, the second blowing agent is in a liquid state at the second temperature, the first blowing agent comprises a silane blowing agent, and the second blowing agent comprises a hydrofluoroolefin blowing agent.

6. The process for the preparation of a foamed material according to claim 5, characterized in that, The difference between the boiling points of the first blowing agent and the second blowing agent is not less than 30°C; optionally, the difference between the boiling points of the first blowing agent and the second blowing agent is not more than 60°C; and / or, The first blowing agent is selected from one or more of tetramethylsilane, hexamethyldisiloxane, methyltriethoxysilane, dimethyldimethoxysilane; and the second blowing agent is selected from one or more of trans-1,1,1,4,4,4-hexafluoro-2-butene, 1-chloro-3,3,3-trifluoropropene, trifluoropropene.

7. The method for preparing the foamed material according to any one of claims 1, 5, and 6, characterized in that, The second component comprises 130-160 parts of the isocyanate and 5-8 parts of the second blowing agent; and / or, ​ In the step of obtaining the foamed material, 100 parts of the first component are mixed with 130-160 parts of the second component.

8. The process for the production of a foamed material according to any one of claims 1 to 4, characterized in that, The auxiliary agent includes a catalyst, a foam stabilizer, and 0.8-1.5 parts of water.

9. The method for preparing the foamed material according to claim 8, characterized in that, The catalyst includes a foaming catalyst and a gel catalyst in a mass ratio of 1:2; optionally, the foaming catalyst is selected from one or more of pentamethyl diethylene triamine, triethylene diamine, N,N,N',N'-tetramethyl ethylene diamine, N,N,N',N'',N''-pentamethyl diisopropyl triamine; optionally, the gel catalyst is selected from one or more of N,N-dimethyl cyclohexylamine, N,N-dimethyl benzylamine, 1,4-diazabicyclo[2.2.2]octane; and / or, The foam stabilizer is selected from Wanheng B8462; and / or, The polyether polyol is selected from one or more of H4110, H3600, H4200, sorbitol type polyether polyol; and / or, The isocyanate is selected from one or more of PM200, MDI, TDI.

10. A foamed material, characterized by The foamed material is prepared by the method of any one of claims 1-9.

11. A refrigeration appliance characterized in that, The foamed material prepared by the method of any one of claims 1-10, or the foamed material of claim 10.

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