Temperature-resistant variable memory sponge and preparation method thereof

Abstract

The application relates to the technical field of sponge materials, and particularly discloses a temperature-variable-resistant memory sponge and a preparation method thereof. The temperature-variable-resistant memory sponge is prepared from raw materials containing the following components in parts by weight: high-EO polyether polyol A 75-85 parts, polyether polyol B 4-6 parts, polyether polyol C 4-6 parts, polymer polyol D 8-12 parts, a catalyst 0.5-0.7 parts, silicon oil 2.5-3.5 parts, a foaming agent 4.5-5.5 parts, isocyanate 55-65 parts and modified composite material 5-10 parts. The preparation method comprises the following steps: pre-mixing the polyether polyol B and the polyether polyol C, then adding the pre-mixed polyether polyol B and the polyether polyol C into the high-EO polyether polyol A and the polymer polyol D to mix, then adding the catalyst, the silicon oil, the foaming agent, the isocyanate and the modified composite material to stir and mix, so as to obtain a mixture; locking and pressing the mixture into a mold, taking the mold after curing and forming, and performing exhaust treatment and edge trimming to obtain the temperature-variable-resistant memory sponge. The temperature-variable-resistant memory sponge has excellent stability under temperature-variable environments, and the overall service life is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of sponge materials, and more specifically, to a temperature-resistant memory sponge and a preparation method thereof. Background Art

[0002] Sponges are porous materials with excellent water absorption and cleaning properties. Sponges are primarily made from wood cellulose fibers or foamed plastic polymers. Natural sponges made from sponges are also available, primarily for body cleansing or painting. There are also synthetic sponges, such as those made from low-density polyether, polyvinyl alcohol, and polyester. Industrial sponges come in many different types, including foam sponges, shaping sponges, rubber sponges, and memory foam.

[0003] Memory foam is a type of polyurethane foam with slow rebound properties, capable of maintaining its shape and performance even in vacuum-compressed packaging. In practice, when subjected to pressure, memory foam slowly returns to its original shape, excelling at absorbing impact and reducing vibration. It also adapts to the surface of external pressure, providing even pressure distribution and reducing localized pressure, thereby conforming to the body's curves and providing uniform support. Consequently, memory foam is widely used in furniture, particularly in pillows, mattresses, sofas, and chairs.

[0004] The main raw materials of memory foam include polyether polyols, blowing agents, catalysts, isocyanates, etc. The specific formula can be adjusted according to demand; the selected raw materials are mixed in a certain proportion and foamed through processes such as prepolymer foaming method, semi-prepolymer foaming method or one-step foaming method; the foamed material needs to be matured at a specific temperature to ensure the foam solidification; after maturation, it can be cut and formed as needed to make the required memory foam product.

[0005] Regarding the above-mentioned related technologies, the inventor believes that for memory foam made of polyurethane, the material tends to harden in low-temperature environments and over-soften in high-temperature environments. This alternating change will produce a certain destructive ability, thereby affecting the application stability of the memory foam; and when there is a large temperature difference in the outside world, the memory foam itself has poor ability to conduct internal and external heat. The impact of the alternating changes is even stronger, which will cause the damage caused by the temperature change to be particularly serious, greatly reducing the application stability of the memory foam and affecting its service life.

[0006] Therefore, it is urgent to propose a solution to solve the above technical problems. Summary of the Invention

[0007] In order to improve the memory foam's ability to conduct internal and external heat and improve its application stability in a temperature-changing environment, the present application provides a temperature-resistant memory foam and a preparation method thereof.

[0008] In the first aspect, the present application provides a temperature-resistant memory foam, which adopts the following technical solution:

[0009] A temperature-resistant memory foam is made from the following raw materials in parts by weight:

[0010] High EO polyether polyol A 75-85 parts;

[0011] 4-6 parts of polyether polyol B;

[0012] Polyether polyol C 4-6 parts;

[0013] 8-12 parts of polymer polyol D;

[0014] 0.5-0.7 parts of catalyst;

[0015] 2.5-3.5 parts silicone oil;

[0016] 4.5-5.5 parts of foaming agent;

[0017] 55-65 parts of isocyanate;

[0018] 5-10 parts of modified composite material;

[0019] The modified composite material is prepared by the following method:

[0020] S1. Dispersing carbon nanotube raw materials in a mixture of deionized water and methanol, adding a nano-treatment agent, and continuously stirring. After heating at 110-130° C. for 20-24 hours, washing with deionized water and drying to obtain an intermediate powder;

[0021] S2, taking porous boron nitride and dispersing it in a mixture of deionized water and anhydrous ethanol, stirring, and centrifuging to obtain pretreated porous boron nitride; then mixing the pretreated porous boron nitride and a silane coupling agent in deionized water, stirring, filtering, and drying to obtain modified porous boron nitride;

[0022] S3, taking the intermediate powder in step S1 and the modified porous boron nitride in step S2, mixing them in deionized water, stirring them, letting them stand and air-dry, and then calcining them at 400-500° C. to obtain a modified composite material;

[0023] The weight ratio of nano titanium dioxide to nano zinc oxide in the nano treatment agent is 1:(2-3).

[0024] By adopting the above technical solution, in the preparation of the modified composite material, the carbon nanotube raw material is first treated to load the surface with nano-titanium dioxide and nano-zinc oxide nanoparticles. The resulting intermediate powder is not only less prone to agglomeration, but also forms a relatively three-dimensional convex structure on the surface. The porous boron nitride is then pretreated with anhydrous ethanol and surface-modified with a silane coupling agent. The resulting modified porous boron nitride not only has excellent dispersibility but also improves its own surface properties, especially the adhesion and compatibility of its porous structure. Next, when the intermediate powder and the modified porous boron nitride are mixed, the intermediate powder is stably loaded into the porous structure of the modified porous boron nitride. After calcination, a modified composite material with a dot-net divergent structure is formed. When the modified composite material is used in the preparation of temperature-variable memory foam, it can form a continuous heat conduction network to improve thermal dissipation. By reducing the persistence of thermal differences, it reduces the damage caused by internal thermal alternation and multi-gradient changes, thereby greatly extending the service life of the temperature-variable memory foam in temperature-variable environments. At the same time, in the modified composite material, carbon nanotubes and porous boron nitride are used as the main structural framework, supplemented by nano-treatment agents composed of nano-titanium dioxide and nano-zinc oxide. Through a specific method, they are combined to form a specific structure, and by utilizing their compounding with each other, they can improve the temperature-resistant memory foam's own ability to conduct internal and external heat, thereby improving its application stability in temperature-changing environments, and have an overall significant improvement effect.

[0025] Preferably, the weight ratio of nano titanium dioxide to nano zinc oxide in the nano treatment agent is 1:2.5.

[0026] By adopting the above technical solution, the high specific surface area of ​​nano-titanium dioxide enables it to provide more heat conduction paths; nano-zinc oxide can stabilize the molecular structure of polyurethane and bring about a significant improvement in heat resistance and thermal conductivity; and when nano-titanium dioxide and nano-zinc oxide are compounded in the above weight ratio, a better morphological bonding structure can be formed on the surface of the nanotube raw material and exert a better corresponding effect. The final temperature-resistant memory foam has better application stability performance in temperature-changing environments.

[0027] Preferably, in the preparation of the modified composite material, the weight ratio of the carbon nanotube raw material to the nano-treatment agent is 1:(0.3-0.5).

[0028] By adopting the above technical solution and matching the above proportions, the nano-treatment agent can be loaded on the surface of the carbon nanotubes more completely and evenly, and the corresponding structural characteristics formed by the nano-treatment agent are also more prominent, thereby being able to exert better corresponding effects, and ultimately obtaining a temperature-resistant memory foam with better application stability in a temperature-changing environment.

[0029] Preferably, in the preparation of the modified composite material, deionized water and anhydrous ethanol are prepared into a mixed solution in a volume ratio of (0.8-1.2):1.

[0030] By adopting the above technical solution, after the above mixed liquid is used to treat the porous boron nitride, it can play an excellent role in cleaning and removing impurities, ensuring the purity and dispersibility of the porous boron nitride, so that the pretreated porous boron nitride can be fully utilized in subsequent operations, and at the same time, it also improves the quality stability of the modified composite material preparation process to a certain extent.

[0031] Preferably, in the preparation of the modified composite material, porous boron nitride is dispersed in a mixture of deionized water and anhydrous ethanol at a ratio of 1 g: (8-10) mL.

[0032] By adopting the above technical solution, the porous boron nitride in the above proportion can be fully dispersed in the mixed liquid to form a uniform suspension, and then can fully interact with each other, and finally obtain pretreated porous boron nitride with better quality.

[0033] Preferably, in the preparation of the modified composite material, the weight ratio of porous boron nitride to silane coupling agent is (8-12):1.

[0034] By adopting the above technical solution, when the ratio of porous boron nitride to silane coupling agent is lower than the above range, the silane coupling agent content is too high, which can easily lead to aggregation of coupling agent molecules and affect dispersibility; when the ratio of porous boron nitride to silane coupling agent is lower than the above range, the silane coupling agent content is too low, which can easily lead to incomplete modification. Both of these situations make it difficult for the modified porous boron nitride to form an excellent and stable combination with the intermediate powder after application. It can be seen that the above weight ratio of porous boron nitride to silane coupling agent can produce a modified porous boron nitride of higher quality, and can form a modified composite material with excellent application effects after combining with the intermediate powder.

[0035] Preferably, in the preparation of the modified composite material, the weight ratio of the intermediate powder to the modified porous boron nitride is (1.2-1.6):1.

[0036] By adopting the above technical solution, when the intermediate powder and modified porous boron nitride in the above weight ratio are used, they can be fully combined during the preparation and form a relatively uniform and tight bonding structure, so that the obtained modified composite material can exert excellent and stable corresponding effects in the preparation and application of temperature-resistant memory foam, and ultimately bring about excellent performance in improving temperature-resistant performance.

[0037] Preferably, in the preparation of the modified composite material, the carbon nanotube raw material has a diameter of 20-50 nm and a length of 600-800 μm; the nano-treatment agent has an average particle size of 40-60 nm; and the porous boron nitride has an average pore size of 30-40 μm and a particle size of 100-150 μm.

[0038] By using the above technical solutions, the carbon nanotube raw material, the nano-treatment agent and the porous boron nitride of the above specifications can fully combine with each other and exert excellent compounding effect in the preparation of the modified composite material, thereby ensuring that the finally obtained modified composite material has excellent and stable application quality, and being conducive to improving the application stability of the temperature change resistant memory sponge in a temperature change environment.

[0039] Preferably, the high EO polyether polyol A is a polyether polyol with a hydroxyl value of 32 mgKOH / g; the polyether polyol B is a polyether polyol with a di-functionality and a hydroxyl value of 56 mgKOH / g, and the polyether polyol B is grafted with EO / PO blocks; the polyether polyol C is a polyether polyol with a tri-functionality and a hydroxyl value of 56 mgKOH / g, and the polyether polyol C is grafted with EO / PO blocks; and the polymer polyol D is a polymer polyol with a tri-functionality and a hydroxyl value of 28 mgKOH / g.

[0040] By using the above technical solutions, the high EO polyether polyol A, the polyether polyol B, the polyether polyol C and the polymer polyol D of the above types are used in combination, which can form a relatively stable cross-linking structure and enable the sponge to meet the quality requirement of being vacuum compressed at a low density; at the same time, the raw materials of the above specifications can fully act and combine with other raw materials, thereby ensuring that the finally obtained vacuum compression memory sponge has excellent and stable quality.

[0041] In a second aspect, the application provides a preparation method of a temperature change resistant memory sponge, which uses the following technical solutions:

[0042] A preparation method of a temperature change resistant memory sponge, comprising the following steps:

[0043] (1) preparing raw materials including a high EO polyether polyol A, a polyether polyol B, a polyether polyol C, a polymer polyol D, a catalyst, a silicone oil, a foaming agent, an isocyanate and a modified composite material according to a proportioning;

[0044] (2) pre-mixing the polyether polyol B and the polyether polyol C in step (1), and then adding them into the high EO polyether polyol A and the polymer polyol D for mixing, and then adding the catalyst, the silicone oil, the foaming agent, the isocyanate and the modified composite material for stirring and mixing to obtain a mixture;

[0045] (3) The mixture obtained in step (2) is quickly poured into the mold, and the mold is closed and locked. After curing and forming, the mold is removed, and exhaust treatment and trimming processes are performed to finally obtain a temperature-resistant memory foam.

[0046] By adopting the above technical solution, the above preparation method is simple to operate. The raw materials are added and mixed in sequence, which not only facilitates quality control during the process, but also ensures that the raw materials are fully dispersed and combined, and exert their excellent corresponding effects, thereby ultimately producing high-quality and stable temperature-resistant memory foam. At the same time, the above preparation method is also suitable for large-scale industrial production and has excellent overall applicability.

[0047] In summary, this application has the following beneficial effects:

[0048] This application uses a modified composite material with carbon nanotubes and porous boron nitride as the main structural framework, supplemented by nano-treatment agents composed of nano-titanium dioxide and nano-zinc oxide, and combined through a specific method to form a specific structure. It can improve the temperature-resistant memory foam's own ability to conduct internal and external heat, thereby improving its application stability in a temperature-changing environment, effectively increasing its service life, and having a significant progressive effect. DETAILED DESCRIPTION

[0049] The present application is further described in detail below with reference to preparation examples, embodiments and comparative examples.

[0050] Unless otherwise specified, the raw materials used in the preparation examples, embodiments and comparative examples of the present application are all commercially available.

[0051] High EO polyether polyol A is a polyether polyol having a hydroxyl value of 32 mgKOH / g and an average molecular weight of 7000;

[0052] Polyether polyol B is a difunctional polyether polyol with a hydroxyl value of 56 mgKOH / g, and the polyether polyol B is grafted with EO / PO blocks and has an average molecular weight of 3000;

[0053] Polyether polyol C is a trifunctional polyether polyol with a hydroxyl value of 56 mgKOH / g, and the polyether polyol C is grafted with EO / PO blocks and has an average molecular weight of 3000;

[0054] Polymer polyol D is a trifunctional polymer polyol with a hydroxyl value of 28 mgKOH / g and an average molecular weight of 6000;

[0055] The catalyst is a tin catalyst, which is dibutyltin oxide;

[0056] The silicone oil is a special composite silicone oil purchased from Shin-Etsu KS-66 silicone oil;

[0057] The foaming agent was purchased from Dongguan Shengli New Materials Co., Ltd. as 701DU expanded microsphere physical foaming agent;

[0058] Isocyanate is special modified MDI purchased from Wanhua 8019.

[0059] Preparation examples of raw materials and / or intermediates

[0060] Preparation Example 1

[0061] A modified composite material is prepared by the following method:

[0062] S1. Disperse the carbon nanotube raw material in a mixture of deionized water and methanol, add a nano-treatment agent, and stir continuously at 150 rpm for 2 hours. Heat at 110-130°C for 20-24 hours (preferably 120°C for 24 hours in this preparation example), wash with deionized water, and dry to obtain an intermediate powder.

[0063] S2. Dispersing porous boron nitride in a mixture of deionized water and anhydrous ethanol, stirring at 300 rpm for 30 minutes, and centrifuging to obtain pretreated porous boron nitride; then mixing the pretreated porous boron nitride and a silane coupling agent in deionized water, stirring at 300 rpm for 2 hours, and filtering and drying to obtain modified porous boron nitride;

[0064] S3. The intermediate powder in step S1 and the modified porous boron nitride in step S2 are mixed in deionized water, stirred at 300 rpm for 30 min, allowed to stand and air-dry, and then calcined at 400-500° C. (preferably 450° C. for 5 h in this preparation example) to obtain a modified composite material.

[0065] Note: In the above operation, the nano-treatment agent is composed of nano-titanium dioxide and nano-zinc oxide in a weight ratio of 1:2.5. The weight ratio of the carbon nanotube raw material and the nano-treatment agent is 1:0.4. Deionized water and anhydrous ethanol are prepared into a mixture in a volume ratio of 1:1. Porous boron nitride is dispersed in the mixture of deionized water and anhydrous ethanol at a ratio of 1g:9mL. The weight ratio of porous boron nitride to silane coupling agent is 10:1. The weight ratio of intermediate powder to modified porous boron nitride is 1.4:1. The diameter of the carbon nanotube raw material is 35nm and the length is 700μm; the average particle size of the nano-treatment agent is 50nm; the average pore size of the porous boron nitride is 35μm and the particle size is 125μm.

[0066] Preparation Example 2

[0067] A modified composite material is different from Preparation Example 1 in that the nano-treatment agent comprises nano-titanium dioxide and nano-zinc oxide in a weight ratio of 1:2.

[0068] Preparation Example 3

[0069] A modified composite material is different from Preparation Example 1 in that the nano-treatment agent comprises nano-titanium dioxide and nano-zinc oxide in a weight ratio of 1:3.

[0070] Preparation Example 4

[0071] A modified composite material is different from Preparation Example 1 in that the weight ratio of the carbon nanotube raw material to the nano-treatment agent is 1:0.3.

[0072] Preparation Example 5

[0073] A modified composite material is different from Preparation Example 1 in that the weight ratio of the carbon nanotube raw material to the nano-treatment agent is 1:0.5.

[0074] Preparation Example 6

[0075] A modified composite material is different from Preparation Example 1 in that deionized water and anhydrous ethanol are prepared into a mixed liquid at a volume ratio of 0.8:1.

[0076] Preparation Example 7

[0077] A modified composite material is different from Preparation Example 1 in that deionized water and anhydrous ethanol are prepared into a mixed liquid at a volume ratio of 1.2:1.

[0078] Preparation Example 8

[0079] A modified composite material is different from Preparation Example 1 in that porous boron nitride is dispersed in a mixture of deionized water and anhydrous ethanol at a ratio of 1 g:8 mL.

[0080] Preparation Example 9

[0081] A modified composite material is different from Preparation Example 1 in that porous boron nitride is dispersed in a mixture of deionized water and anhydrous ethanol at a ratio of 1 g:10 mL.

[0082] Preparation Example 10

[0083] A modified composite material is different from Preparation Example 1 in that the weight ratio of porous boron nitride to the silane coupling agent is 8:1.

[0084] Preparation Example 11

[0085] A modified composite material is different from Preparation Example 1 in that the weight ratio of porous boron nitride to the silane coupling agent is 12:1.

[0086] Preparation Example 12

[0087] A modified composite material is different from Preparation Example 1 in that the weight ratio of the intermediate powder to the modified porous boron nitride is 1.2:1.

[0088] Preparation Example 13

[0089] A modified composite material is different from Preparation Example 1 in that the weight ratio of the intermediate powder to the modified porous boron nitride is 1.6:1.

[0090] Preparation Example 14

[0091] A modified composite material is different from Preparation Example 1 in that the diameter of the carbon nanotube raw material is 20 nm and the length is 600 μm; the average particle size of the nano-treatment agent is 40 nm; the average pore size of the porous boron nitride is 30 μm and the particle size is 100 μm.

[0092] Preparation Example 15

[0093] A modified composite material is different from Preparation Example 1 in that the diameter of the carbon nanotube raw material is 50 nm and the length is 800 μm; the average particle size of the nano-treatment agent is 60 nm; the average pore size of the porous boron nitride is 40 μm and the particle size is 150 μm.

[0094] Preparation Example 16

[0095] A modified composite material is different from Preparation Example 1 in that nano zinc oxide is not used in the nano treatment agent.

[0096] Preparation Example 17

[0097] A modified composite material is different from Preparation Example 1 in that nano-titanium dioxide is not used in the nano-treatment agent.

[0098] Preparation Example 18

[0099] A modified composite material, which is different from Preparation Example 1 in that it is prepared by the following method:

[0100] S1. Dispersing porous boron nitride in a mixture of deionized water and anhydrous ethanol, stirring at 300 rpm for 30 minutes, and centrifuging to obtain pretreated porous boron nitride; then mixing the pretreated porous boron nitride and a silane coupling agent in deionized water, stirring at 300 rpm for 2 hours, and filtering and drying to obtain modified porous boron nitride;

[0101] S2. Take the carbon nanotube raw material and the modified porous boron nitride prepared in step S2, mix them in deionized water, stir at 300 rpm for 30 minutes, let it stand and air-dry, and then calcine at 400-500°C (preferably 450°C for 5 hours in this preparation example) to obtain a modified composite material. Example

[0102] Example 1

[0103] A temperature-resistant memory sponge is prepared by using raw materials and their corresponding weight parts as shown in Table 1, and by the following steps:

[0104] (1) Prepare raw materials containing high-EO polyether polyol A, polyether polyol B, polyether polyol C, polymer polyol D, catalyst, silicone oil, foaming agent, isocyanate, and modified composite according to the ratio;

[0105] (2) Pre-mix the polyether polyol B and polyether polyol C in step (1), then add to the high-EO polyether polyol A and polymer polyol D for mixing, and then add the catalyst, silicone oil, foaming agent, isocyanate, and modified composite for stirring and mixing to obtain a mixture;

[0106] (3) Pour the mixture obtained in step (2) into a mold quickly, close the mold for pressure locking, and after curing and forming, take out the mold, and perform exhaust treatment and edge trimming process to finally obtain the temperature-resistant memory sponge.

[0107] Note: The modified composite in the above steps is obtained from Preparation Example 1. The density of the prepared temperature-resistant memory sponge is 40 kg / m.

[0108] Example 2-3

[0109] A temperature-resistant memory sponge, which differs from Example 1 in that the raw materials used for preparation and their corresponding weight parts are shown in Table 1.

[0110] Table 1 Raw materials used for preparation and their corresponding weight parts (parts / kg) of Examples 1-3

[0111]

[0112] Example 4

[0113] A temperature-resistant memory sponge, which differs from Example 1 in that the modified composite is obtained from Preparation Example 2.

[0114] Example 5

[0115] A temperature-resistant memory sponge, which differs from Example 1 in that the modified composite is obtained from Preparation Example 3.

[0116] Example 6

[0117] A temperature-resistant memory sponge, which differs from Example 1 in that the modified composite is obtained from Preparation Example 4.

[0118] Example 7

[0119] A temperature-resistant memory sponge, which differs from Example 1 in that the modified composite is obtained from Preparation Example 5.

[0120] Example 8

[0121] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 6.

[0122] Example 9

[0123] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 7.

[0124] Example 10

[0125] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 8.

[0126] Example 11

[0127] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 9.

[0128] Example 12

[0129] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 10.

[0130] Example 13

[0131] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 11.

[0132] Example 14

[0133] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 12.

[0134] Example 15

[0135] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 13.

[0136] Example 16

[0137] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 14.

[0138] Example 17

[0139] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 15.

[0140] Comparative Example

[0141] Comparative Example 1

[0142] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 16.

[0143] Comparative Example 2

[0144] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 17.

[0145] Comparative Example 3

[0146] A temperature-resistant memory foam, which is different from Example 1 in that the modified composite material is obtained from Preparation Example 18.

[0147] Comparative Example 4

[0148] A temperature-resistant memory sponge is different from Example 1 in that the modified composite material is replaced with carbon nanotube raw material.

[0149] Comparative Example 5

[0150] A temperature-resistant memory foam, which differs from Example 1 in that the modified composite material is replaced with porous boron nitride.

[0151] Comparative Example 6

[0152] A temperature-resistant memory sponge is different from Example 1 in that the modified composite material is replaced by a nano-treatment agent composed of nano-titanium dioxide and nano-zinc oxide.

[0153] Comparative Example 7

[0154] A temperature-resistant memory sponge is different from Example 1 in that the mass of the modified composite material is replaced by a mixture of carbon nanotube raw material, porous boron nitride and nano-treatment agent in corresponding weight ratios.

[0155] Comparative Example 8

[0156] A temperature-resistant memory foam is different from Example 1 in that no modified composite material is used.

[0157] Performance testing

[0158] Test samples: The temperature-resistant memory sponge obtained in Examples 1-17 was selected as test sample 1-17, and the temperature-resistant memory sponge obtained in Comparative Examples 1-8 was selected as control sample 1-8.

[0159] Test method: Tear strength is one of the important indicators for evaluating the structural strength of temperature-resistant memory foam. The tensile tearing method is usually used to test the tearing strength of temperature-resistant memory foam. The tensile tearing method is to apply a gradually increasing tensile force to the temperature-resistant memory foam sample through a tensile testing machine until the sample tears, thereby measuring its tearing strength.

[0160] Take a sample of temperature-resistant memory foam and perform the above test. The obtained tear strength is recorded as A1.

[0161] Place the temperature-resistant memory foam sample in a high and low temperature alternating test chamber with an initial temperature of 25°C. First, heat it to 80°C at a rate of 2°C / min, then cool it to -25°C at a rate of 1.5°C / min, and then heat it to 25°C at a rate of 1°C / min. This is recorded as one cycle. After 50 cycles, the treated temperature-resistant memory foam sample is obtained and tested in the same manner. The obtained tear strength is recorded as A2.

[0162] Then calculate the tear strength loss rate of the temperature-resistant memory foam, the tear strength loss rate of the temperature-resistant memory foam = (A1-A2) / A1; the higher the loss rate, the worse the application stability of the temperature-resistant memory foam in a temperature-changing environment.

[0163] After the above tests were performed on the test samples 1-17 and the control samples 1-8, the test results were recorded in Table 2.

[0164] Table 2 Test results of test samples 1-17 and control samples 1-8

[0165]

[0166]

[0167] Combining Example 1 and Comparative Examples 4-8 with Table 2, it can be seen that the present application uses a modified composite material with carbon nanotubes and porous boron nitride as the main structural framework, supplemented by nano-titanium dioxide and nano-zinc oxide, and combined by a specific method to form a specific structure, which can significantly improve the application stability of temperature-resistant memory foam in a temperature-changing environment, and the tear strength loss rate obtained by the above test is significantly lower. If carbon nanotubes, porous boron nitride or nano-treatment agents are used alone, although they can bring about corresponding effects, the improvement is extremely limited; at the same time, if carbon nanotubes, porous boron nitride and nano-treatment agents are simply mixed and used, it only brings about a simple superposition of effects; it can be seen that only when carbon nanotubes, porous boron nitride and nano-treatment agents are prepared by a specific method to obtain a modified composite material, can a significant improvement effect of 1+1>2 be achieved.

[0168] Combined with Example 1 and Comparative Examples 1-3 and Table 2, it can be seen that if the use of the nano-treatment agent is lacking in the preparation of the modified composite material, it is found that the application stability of the temperature-resistant memory sponge in a temperature-changing environment will be significantly reduced; at the same time, if only one of nano-titanium dioxide and nano-zinc oxide is used as a nano-treatment agent, the corresponding effect is limited, and the sum of the effects of the two being used alone is far less than the excellent improvement effect brought by the combined use of the two; it can be seen that the combined use of nano-titanium dioxide and nano-zinc oxide can significantly improve the application stability of the temperature-resistant memory sponge in a temperature-changing environment.

[0169] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A temperature-resistant memory foam, characterized in that: Made from the following raw materials in parts by weight: High EO polyether polyol A 75-85 parts; 4-6 parts of polyether polyol B; Polyether polyol C 4-6 parts; 8-12 parts of polymer polyol D; 0.5-0.7 parts of catalyst; 2.5-3.5 parts silicone oil; 4.5-5.5 parts of foaming agent; 55-65 parts of isocyanate; 5-10 parts of modified composite material; The modified composite material is prepared by the following method: S1. Dispersing carbon nanotube raw materials in a mixture of deionized water and methanol, adding a nano-treatment agent, and continuously stirring. After heating at 110-130° C. for 20-24 hours, washing with deionized water and drying to obtain an intermediate powder; S2, taking porous boron nitride and dispersing it in a mixture of deionized water and anhydrous ethanol, stirring, and centrifuging to obtain pretreated porous boron nitride; then mixing the pretreated porous boron nitride and a silane coupling agent in deionized water, stirring, filtering, and drying to obtain modified porous boron nitride; S3, taking the intermediate powder in step S1 and the modified porous boron nitride in step S2, mixing them in deionized water, stirring them, letting them stand and air-dry, and then calcining them at 400-500° C. to obtain a modified composite material; The weight ratio of nano titanium dioxide and nano zinc oxide in the nano treatment agent is 1: (2-3); In the preparation of the modified composite material, the weight ratio of the carbon nanotube raw material and the nano-treatment agent is 1: (0.3-0.5); deionized water and anhydrous ethanol are configured into a mixed solution at a volume ratio of (0.8-1.2) : 1; porous boron nitride is dispersed in the mixed solution of deionized water and anhydrous ethanol at a ratio of 1 g: (8-10) mL; the weight ratio of the porous boron nitride and the silane coupling agent is (8-12) : 1; the weight ratio of the intermediate powder and the modified porous boron nitride is (1.2-1.6) : 1; the diameter of the carbon nanotube raw material is 20-50 nm, the length is 600-800 μm; the average particle size of the nano-treatment agent is 100 μm. The diameter is 40-60 nm; the average pore diameter of the porous boron nitride is 30-40 μm, and the particle size is 100-150 μm; the high EO polyether polyol A is a polyether polyol with a hydroxyl value of 32 mgKOH / g; the polyether polyol B is a difunctional polyether polyol with a hydroxyl value of 56 mgKOH / g, and the polyether polyol B is grafted with EO / PO blocks; the polyether polyol C is a trifunctional polyether polyol with a hydroxyl value of 56 mgKOH / g, and the polyether polyol C is grafted with EO / PO blocks; and the polymer polyol D is a trifunctional polymer polyol with a hydroxyl value of 28 mgKOH / g.

2. The temperature-resistant memory foam according to claim 1, characterized in that: The weight ratio of nano titanium dioxide to nano zinc oxide in the nano treatment agent is 1:2.

5.

3. The method for preparing the temperature-resistant memory foam according to claim 1, wherein: The following steps are involved: (1) Prepare raw materials including high EO polyether polyol A, polyether polyol B, polyether polyol C, polymer polyol D, catalyst, silicone oil, foaming agent, isocyanate and modified composite material according to the ratio; (2) pre-mixing the polyether polyol B and the polyether polyol C in step (1), adding the mixture to the high EO polyether polyol A and the polymer polyol D, and then adding a catalyst, silicone oil, a foaming agent, an isocyanate and a modified composite material, stirring and mixing to obtain a mixture; (3) The mixture obtained in step (2) is quickly poured into the mold, and the mold is closed and locked. After curing and forming, the mold is removed, and exhaust treatment and trimming processes are performed to finally obtain a temperature-resistant memory foam.

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