Graphene heating product integrated by foaming technology and preparation method thereof

Abstract

The invention discloses a graphene heating product integrated by adopting a foaming technology, which comprises a framework layer, a foaming layer and a graphene heating cushion layer which are arranged in sequence, and the framework layer, the foaming layer and the graphene heating cushion layer are integrated through foaming. The invention also discloses a preparation method of the integrated graphene heating product by adopting the foaming technology, which comprises the following steps: step 1, pasting the graphene heating pad in an upper mold of a foaming mold in a matching manner, putting the skeleton in a lower mold of the foaming mold, and then closing the foaming mold; 2, a foaming material is injected into a cavity of the foaming mold; wherein the foaming material is a mixture of isocyanate and polyhydric alcohol, and the volume ratio of the isocyanate to the polyhydric alcohol is (10-50): 100; and step 3, carrying out foaming molding after material injection is completed, and opening the foaming mold to obtain a graphene heating product. The method has the characteristics of saving working procedures, improving the processing efficiency and resisting high temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive interiors and seat peripherals. More specifically, the present invention relates to a graphene heating product integrated by foaming technology and a preparation method thereof. Background Art

[0002] With the continuous growth of people's personalized needs for automotive products, the design and production of automobiles and their internal components also exhibit diverse functional characteristics. As an automotive product component that directly contacts the human body, automotive seats need to have good safety, comfort, and environmental friendliness.

[0003] Graphene material is a honeycomb structure composed of six-ring materials and is a lightweight material with good functional characteristics emerging in recent years. Graphene material has better heat-up performance than resistance wires. Graphene plays a role in quickly and evenly transferring heat in the graphene heating pad, making the graphene heating pad have better thermal uniformity, and the graphene heating pad can meet the optimized design requirements of automotive seats.

[0004] The process of existing graphene heating products is as follows: spraying glue - drying - pre-positioning - edge wrapping - trimming - laminating on the graphene heating pad and the skeleton substrate to complete the integration of the graphene heating pad and the skeleton substrate.

[0005] Since the integration process of graphene products and the skeleton includes processes such as spraying glue, drying, pre-positioning, and laminating, it is equivalent to adding processes and operations related to the integration of graphene heating products and the skeleton to the original processes and equipment investment, thereby increasing a very high manufacturing cost and investment. Moreover, the graphene heating products made by the existing preparation process have poor visual effects and strong product odors. Summary of the Invention

[0006] The purpose of the present invention is to design and develop a graphene heating product integrated by foaming technology, integrating the graphene heating pad and the plastic part in a foaming form to improve product performance in various aspects.

[0007] The present invention also designs and develops a preparation method of a graphene heating product integrated by foaming technology, integrating the graphene heating pad and the skeleton in a foaming form and adjusting the ratio of the foaming material to reduce processing procedures and improve the performance of the product in terms of adhesion and high temperature resistance.

[0008] The technical solution provided by the present invention is as follows:

[0009] A graphene heating product integrated by foaming technology, comprising a skeleton layer, a foaming layer, and a graphene heating pad layer arranged in sequence, and the skeleton layer, the foaming layer, and the graphene heating pad layer are integrated by foaming.

[0010] Preferably, the skeleton layer is a structural part of an automobile.

[0011] Preferably, the graphene heating layer includes a seven-layer structure, which are encapsulation cloth - PI film - graphene layer - conductive cloth layer - graphene layer - PI film - encapsulation cloth respectively.

[0012] Preferably, the solid content of graphene in the graphene layer is 1%.

[0013] Preferably, the foaming layer is a mixture of isocyanate and polyol, and the volume ratio of isocyanate to polyol is 10 - 50:100.

[0014] A preparation method of a graphene heating product integrated by foaming technology includes the following steps:

[0015] Step 1: Match and paste the graphene heating pad inside the upper mold of the foaming mold. After placing the skeleton inside the lower mold of the foaming mold, then close the foaming mold.

[0016] Step 2: Inject foaming material into the cavity of the foaming mold.

[0017] Wherein, the foaming material is a mixture of isocyanate and polyol, and the volume ratio of isocyanate to polyol is 10 - 50:100.

[0018] Step 3: After the injection is completed, conduct foaming and molding. Open the foaming mold to obtain the graphene heating product.

[0019] Preferably, in Step 1, it further includes cutting the graphene heating pad into a shape matching the foaming mold.

[0020] Preferably, in Step 2, the foaming material is injected into the foaming mold through a handheld foaming gun head, and the pressure of the foaming gun head during injection is 6 - 10 bar.

[0021] Preferably, the foaming and molding specifically includes:

[0022] Place the foaming mold at a temperature of 40 - 60 °C for reaction, and the reaction time is 80 - 120 s.

[0023] Preferably, the foaming and molding is carried out through a mold temperature controller for reaction.

[0024] The beneficial effects of the present invention are as follows:

[0025] (1). A graphene heating product integrated by foaming technology designed and developed by the present invention has product performance that can reach that of existing products, and even is superior to existing products in terms of smell, adhesion, and high temperature resistance, improving product performance such as environmental protection, safety, service life, and aesthetics of the product.

[0026] (2) The preparation method of the graphene heating product integrated by the foaming technology developed by the present invention can save several preparation processes through the foaming method and optimize the component adjustment of the foaming material. This means that a large amount of labor, material and time costs can be saved, the production efficiency can be greatly improved, and the product performance of the prepared product can be improved in many aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the graphene heating product integrated by the foaming technology described in the present invention.

[0028] Figure 2 It is a diagram of the graphene heating product prepared in Example 1 of the present invention.

[0029] Figure 3 It is a diagram of the graphene heating product prepared by the prior art described in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following further detailed description of the present invention is made to enable those skilled in the art to implement it with reference to the text of the specification.

[0031] As Figure 1 shown, a graphene heating product integrated by the foaming technology provided by the present invention includes:

[0032] A skeleton layer 100, a foaming layer 200, and a graphene heating cushion layer 300;

[0033] Among them, the skeleton layer 100 is different structural parts of an automobile, including but not limited to an automobile armrest, an inner trim panel of an automobile door, and a backrest of an automobile seat; the graphene heating cushion layer 300 is integrated on the upper part of the skeleton layer 100 through the foaming layer 200.

[0034] In this embodiment, the material of the skeleton layer 100 is a polymer material. As a preferred option, the skeleton layer 100 is made of PC + ABS plastic.

[0035] In this embodiment, the graphene heating pad 300 has a seven-layer structure, including: two encapsulation cloth layers, two PI film layers, two graphene layers, and one conductive cloth layer. The specific composition is: encapsulation cloth - PI film - graphene layer - conductive cloth layer - graphene layer - PI film - encapsulation cloth.

[0036] Among them, the solid content of graphene in the graphene layer is 1%.

[0037] The graphene heating product integrated by the foaming technology provided by the present invention can achieve the performance of existing products, and even be superior to existing products in terms of odor, adhesion, and high temperature resistance, improving product performance such as environmental protection, safety, service life, and aesthetics.

[0038] The present invention also provides a preparation method for a graphene heating product integrated by the foaming technology, which specifically includes the following steps:

[0039] Step 1: Match and paste the graphene heating pad inside the upper mold of the foaming mold. After placing the skeleton inside the lower mold of the foaming mold, then close the foaming mold.

[0040] Among them, the graphene heating pad needs to be cut before pasting. Specifically, the graphene heating pad is cut into a shape matching the foaming mold.

[0041] Step 2: Inject the foaming material into the cavity of the foaming mold.

[0042] The foaming material is a mixture of isocyanate and polyol, and the volume ratio of the isocyanate to the polyol is 10 - 50:100.

[0043] Among them, in this embodiment, the foaming material is injected into the foaming mold by holding the foaming gun head. When injecting the material, the pressure of the foaming gun head is 6 - 10 bar.

[0044] Step 3: After the injection is completed, place the foaming mold at a temperature of 40 - 60 °C for reaction. The reaction time is 80 - 120 s. After foaming and forming, open the foaming mold to obtain the graphene heating product.

[0045] In this embodiment, the foaming and forming is carried out through a mold temperature controller reaction.

[0046] Example 1

[0047] Integrate the graphene heating pad with the car armrest, and obtain the heated armrest through the foaming process, specifically including:

[0048] Cut the graphene heating pad into a shape matching the foaming mold, and paste the cut graphene heating pad into the upper mold of the foaming mold. Among them, to match the corresponding foaming mold, the structure of the graphene heating pad is rectangular, with dimensions of 350 mm × 250 mm. Place the skeleton into the lower mold of the equipment, and then close the foaming mold. Hold the foaming gun head and inject the foaming material into the injection mold. When injecting the material, the pressure of the foaming gun head is 8 bar. The foaming material is a mixture of A and B of isocyanate and polyol, and the volume ratio of A:B is 40:100. Start the foaming equipment, and the foaming material reacts at a mold temperature of 50 °C. The entire mold closing time is expected to be 90 s. After foaming and forming, open the foaming mold to obtain the graphene heating product.

[0049] Example 2

[0050] Integrate the graphene heating pad with the middle trim panel of the car door panel, and obtain the heated door panel middle trim panel through the foaming process, specifically including:

[0051] Cut the graphene heating pad into a shape matching the foaming mold, and paste the cut graphene heating pad onto the upper mold of the foaming mold. Among them, to match the corresponding foaming mold, the structure of the graphene heating pad is rectangular, with dimensions of 400 mm × 200 mm. Place the skeleton into the lower mold of the equipment, and then close the foaming mold. Hold the foaming gun head and inject the foaming material into the injection mold. When injecting the material, the pressure of the foaming gun head is 6 bar. The foaming material is a mixture of A and B of isocyanate and polyol, and the volume ratio of A:B is 10:100. Start the foaming equipment, and the foaming material reacts at a mold temperature of 40 °C. The entire mold closing time is expected to be 80 s. After foaming and forming, open the foaming mold to obtain the graphene heating product.

[0052] Example 3

[0053] Integrate the graphene heating pad with the backrest of the car seat, and obtain the heated seat backrest through the injection process, specifically including:

[0054] Cut the graphene heating pad into a shape matching the foaming mold, and paste the cut graphene heating pad onto the upper mold of the foaming mold. Among them, to match the corresponding foaming mold, the structure of the graphene heating pad is rectangular, with dimensions of 300 mm × 250 mm. Place the skeleton into the lower mold of the equipment, and then close the foaming mold. Hold the foaming gun head and inject the foaming material into the injection mold. When injecting the material, the pressure of the foaming gun head is 10 bar. The foaming material is a mixture of A and B of isocyanate and polyol, and the volume ratio of A:B is 50:100. Start the foaming equipment, and the foaming material reacts at a mold temperature of 60 °C. The entire mold closing time is expected to be 100 s. After foaming and forming, open the foaming mold to obtain the graphene heating product.

[0055] Comparative Example

[0056] The graphene heating pad and the framework are successively subjected to the following operations: spraying glue on the graphene heating pad and the framework, drying the graphene heating pad and the framework, pre-positioning and covering the graphene heating pad and the framework, edging the graphene heating pad and the framework, and hot pressing and compounding the graphene heating pad and the framework, thereby completing the integration of the graphene heating material and the framework substrate (i.e., the graphene heating product).

[0057] The graphene heating products prepared in Examples 1 to 3 and the comparative example are tested. The test contents include:

[0058] High-temperature resistance test: 90 ± 2°C, stored for 24 h;

[0059] Cold resistance test: -40 ± 2°C, stored for 24 h;

[0060] High and low temperature and humidity alternating test:

[0061] a. 40 ± 1°C, 95 ± 5% RH, 14 h;

[0062] b. -40 ± 2°C, 4 h;

[0063] c. 85 ± 2°C, 6 h;

[0064] One cycle consists of a - c, and there are 20 cycles in total;

[0065] Hot air aging test: 80 ± 2°C, stored for 700 ± 2 h;

[0066] Peeling force test: after high and low temperature and humidity alternating;

[0067] Odor test: test temperature 80 ± 2°C, time: 2 h 10 min;

[0068] Epidermal yellowing experiment: powered on for 10 h, powered off for 14 h, cyclic test for 30 d;

[0069] Plastic part deformation test: powered on for 10 h, powered off for 14 h, cyclic test for 30 d;

[0070] Performance attenuation test: powered on for 10 h, powered off for 14 h, cyclic test for 30 d.

[0071] The specific test results are shown in Table 1:

[0072] Table 1 Test results of the graphene heating products prepared in Examples 1 to 3 and the comparative example

[0073]

[0074] Regarding the high-temperature resistance test in Table 1 (normal test storage time: 48 h), it also includes:

[0075] After storing for 85 h, slight delamination occurred on the surface of the product prepared in the comparative example. After storing for 155 h, slight delamination occurred on the surface of the product prepared in Example 1. After storing for 146 h, slight delamination occurred on the surface of the product prepared in Example 2. After storing for 148 h, slight delamination occurred on the surface of the product prepared in Example 3. Therefore, by comparing the products obtained through Examples 1-3 and the comparative example, it can be seen that the graphene heating products prepared by the preparation method of the present invention are more resistant to high temperatures, thereby improving the safety and service life of the products.

[0076] Regarding the odor test, it specifically includes:

[0077] Take 20 g of sample strips from the obtained products and place them in an odor bottle. Place the odor bottle at an experimental temperature of 80 ± 2 °C and store for 2 h, then cool it to 60 ± 5 °C for odor level evaluation, which specifically includes:

[0078] Open one side of the odor bottle cap by 3-4 cm and use a PID electronic nose to evaluate the odor of the sample strips; the passing standard is ≤ 3 levels, where level 1 means no odor and is not easily felt; level 2 means there is an odor that can be felt, with a slight intensity; level 3 means there is an obvious odor that can be clearly felt, with a medium intensity; level 4 means there is an obvious odor with a large intensity; level 5 means there is an obvious odor with a very large intensity; level 6 means an intolerable odor.

[0079] From the comparative example, Examples 1-3 and the above test results, it can be seen that the products prepared by the preparation method of the graphene heating products provided by the present invention can save several preparation processes in the preparation process, which means that a large amount of manpower, material resources and time costs will be saved, and the production efficiency can be greatly improved. And it can be seen from Table 1 that the performance of the products prepared by this method can reach the performance of existing products, and even in terms of odor, it is better than the products prepared in the comparative example, and in terms of adhesion, it is better than the products prepared in the comparative example, improving the environmental protection and product performance of the products, and also being better than the products prepared in the comparative example in terms of high temperature resistance, improving the safety and service life of the products.

[0080] At the same time, due to the injection molding method of the graphene heating pad, the armrest products prepared in Example 1 have no marks on the whole, improving the visual effect during use, such as Figure 2 , while for the existing armrests integrated with the skin + heating pad + skeleton coating, there will be problems of product surface imprints in the shape of electrodes on the product surface after processing, such as Figure 3 shown.

[0081] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described herein.

Claims

1. A graphene heating product integrated with foaming technology, characterized in that: It comprises a skeleton layer, a foaming layer and a graphene heating pad layer which are arranged in sequence, and the skeleton layer, the foaming layer and the graphene heating pad layer are integrated by foaming.

2. The graphene heating product integrated with foaming technology as claimed in claim 1, characterized in that: The skeleton layer is a structural part of the automobile.

3. The graphene heating product integrated with foaming technology as claimed in claim 2, characterized in that: The graphene heating layer comprises a seven-layer structure, and the seven-layer structure is respectively packaging cloth-PI film-graphene layer-conductive cloth layer-graphene layer-PI film-packaging cloth.

4. The graphene heating product integrated with foaming technology as claimed in claim 3, characterized in that: The solid content of graphene in the graphene layer is 1%.

5. The graphene heating product integrated with foaming technology as claimed in claim 4, characterized in that: The foaming layer is a mixture of isocyanate and polyol, and the volume ratio of the isocyanate to the polyol is 10-50:

100.

6. A method for preparing a graphene heating product integrated with foaming technology, characterized in that: The steps include: Step 1: Paste the graphene heating pad in the upper mold of the foaming mold, put the frame into the lower mold of the foaming mold, and then close the foaming mold; Step 2, injecting foaming material into the cavity of the foaming mold; Wherein, the foaming material is a mixture of isocyanate and polyol, and the volume ratio of the isocyanate to the polyol is 10-50:100; Step 3: After the injection is completed, foaming molding is performed, and the foaming mold is opened to obtain a graphene heating product.

7. The method for preparing a graphene heating product integrated with foaming technology according to claim 6, characterized in that: The step one also includes cutting the graphene heating pad into a shape matching the foaming mold.

8. The method for preparing a graphene heating product integrated with foaming technology according to claim 7, characterized in that: In the step 2, the foaming material is injected into the foaming mold by a handheld foaming gun head, and the pressure of the foaming gun head during injection is 6-10 bar.

9. The method for preparing a graphene heating product integrated with foaming technology according to claim 8, characterized in that: The foaming molding specifically comprises: The foaming mold is placed at a temperature of 40-60° C. for reaction, and the reaction time is 80-120 seconds.

10. The method for preparing a graphene heating product integrated with foaming technology according to claim 9, characterized in that: The foaming molding is carried out by a mold temperature controller.

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