Polyurethane conductive heating composite film and preparation method thereof
Through the combination of the extrusion molding process of polyurethane conductive heating composite film and the highly dispersible carbon nanotube, the efficiency and safety performance problems of the existing heating film are solved, and an efficient and easy-to-process automotive seat heating solution is achieved, which is suitable for large-scale Large-scale production.
Patent Information
- Application Number
- CN202411339896.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2024-12-31
AI Technical Summary
The existing heating film heating materials have problems such as low heating efficiency, poor safety performance, poor mechanical performance and difficulty in mass production on a large scale, especially the low cost performance of graphene thermal conductive films, complex production process of carbon fiber heating fabrics, and prone to short circuit risk.
Polyurethane conductive heating composite film is used, composed of polyurethane conductive heating masterbatch, hydrolyzing agent, anti-UV additive, etc., and a conductive heating film is prepared through an extrusion molding process, and conductive silver paste layer and copper wire are connected to both ends of the film. The electrode forms a polyurethane conductive heat-generating composite film, and combines highly dispersible carbon nanotubes to improve mechanical properties.
It realizes efficient conductive heating, has good mechanical properties and is easy to process, is suitable for car seat heating, supports large-scale mass production, and reduces production costs and time.
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile seat ventilation and heating components, and more specifically to a polyurethane conductive heating composite film and a preparation method thereof. Background Art
[0002] At present, the heating materials of the existing heating films are mainly traditional copper wires, new carbon-based materials, etc. The heating films with copper wire as the heating material form a conductive heating network by radiating heat through the copper wire to wrapping materials such as cotton cloth / non-woven fabrics, thereby realizing the entire electrothermal function. However, they have disadvantages such as low heating efficiency and poor safety performance. The heating films with new carbon-based materials as the heating materials include graphene heating films, carbon fiber heating fabrics, etc., but graphene thermal conductive films have low cost performance, poor mechanical properties, and are prone to flaking and delamination. Carbon fiber heating fabrics need to be covered with a carbon fiber heating network on the fabric to maintain heating. They have strict requirements on the manufacturing process, are difficult to mass-produce, and have the risk of carbon fiber falling off and causing a short circuit in the conductive network. Summary of the invention
[0003] In view of this, the present invention provides a polyurethane conductive heating composite film and a preparation method thereof, aiming to solve the above technical problems.
[0004] In order to achieve the above object, the present invention adopts the following technical solution: A polyurethane conductive heating composite film is composed of the following raw materials in parts by mass: 20-40 parts of polyurethane conductive heating masterbatch, 1-3 parts of hydrolysis resistance agent, 0.1-3 parts of anti-UV additive.
[0005] Preferably, the polyurethane conductive heating masterbatch is composed of the following raw materials in parts by mass: 50-80 parts of isocyanate, 40-60 parts of polyol, 8-10 parts of chain extender, 4-6 parts of catalyst, 1-3 parts of antioxidant, 5-15 parts of flame retardant, 15-30 parts of highly dispersed carbon nanotubes, and 1-3 parts of water repellent.
[0006] The present invention provides a method for preparing a polyurethane conductive heating composite film, comprising the following steps: S1. preparing polyurethane conductive heating masterbatch; S2. Mix the polyurethane conductive heating masterbatch, hydrolysis resistant agent and UV resistant additive according to the weight ratio, put them into the extruder baking chamber, and preheat at 100-130°C; S3, extruding, cooling, and stretching the material baked in step S2 to obtain a film; S4. Cut the film obtained in step S3 into films of corresponding specifications and sizes, apply a conductive silver paste layer on both ends of the film by coating or 3D printing, and connect copper wire electrodes by spot welding or adhesive to obtain a polyurethane conductive heating composite film.
[0007] Preferably, in step S1, the preparation method of the polyurethane conductive heating masterbatch is: isocyanate, polyol, chain extender, catalyst, antioxidant, flame retardant, highly dispersible carbon nanotubes, and waterproofing agent are mixed in proportions by weight, reacted at a temperature of 70-90°C for 6-8h to generate a polyurethane precursor, and the polyurethane precursor is granulated by a granulator to obtain the polyurethane conductive heating masterbatch.
[0008] Preferably, in step S3, the thickness of the film obtained is 0.08 mm-4 mm.
[0009] Preferably, in step S3, an extruder is used to extrude the material baked in step S2, wherein the screw temperature is 170-220°C and the die head temperature is 170-220°C.
[0010] The present invention provides a seat heating film, which is made of a plurality of polyurethane conductive heating composite films connected in series and equipped with a protective cover, a temperature control device, a temperature sensor, a power supply and other devices, so as to obtain a polyurethane conductive heating film workpiece, which is applied to car seats and can realize seat heating and rapid temperature rise at a low voltage of 12V-36V.
[0011] It can be seen from the above technical solution that, compared with the prior art, the polyurethane conductive heating composite film and the preparation method thereof provided by the present invention have the following beneficial effects: The present invention combines the characteristics of polyurethane such as temperature resistance, tear resistance, stretch resistance, softness, wear resistance, moisture-proof and breathable, and corrosion resistance, and introduces highly dispersed carbon nanotube particles to prepare a conductive heating polyurethane masterbatch. Through a cast extrusion molding process, an ultra-high polyurethane low-voltage conductive heating composite film coil with a uniform thickness and a resistance measurement value of 10-100Ω is prepared. The coil has good mechanical properties and can be easily processed into various specifications and sizes of seat heating films, and can be mass-produced.
[0012] The polyurethane conductive heating composite film produced by the invention is a new type of heating material, which is convenient to process and simple to operate, can be mass-produced, greatly saves time and reduces costs. DETAILED DESCRIPTION
[0013] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0014] Embodiment 1: The embodiment of the present invention discloses a polyurethane conductive heating composite film, which is composed of the following raw materials in parts by mass: 20 parts of polyurethane conductive heating masterbatch, 1 part of hydrolysis resistance agent, and 0.1 part of anti-UV additive.
[0015] Among them, the polyurethane conductive heating masterbatch is composed of the following raw materials in parts by mass: 50 parts of isocyanate, 40 parts of polyol, 8 parts of chain extender, 4 parts of catalyst, 1 part of antioxidant, 5 parts of flame retardant, 15 parts of highly dispersed carbon nanotubes, and 1 part of waterproofing agent.
[0016] The present invention provides a method for preparing a polyurethane conductive heat-generating composite film, comprising the following steps: S1. preparing polyurethane conductive heating masterbatch; S2, pre-melt extrusion baking step: polyurethane conductive heating masterbatch, hydrolysis resistance agent, anti-UV additive are mixed according to weight proportion, put into the extruder baking cavity, the temperature is 100-130°C, and preheated; S3, melt extrusion molding step: screw temperature: 170-220°C, die head temperature: 170-220°C, at an appropriate screw speed (preferably 20r / min), the material baked in step S2 is extruded, cooled, and stretched to obtain a film; the thickness of the obtained film is 0.08mm-4mm; S4. Cut the film obtained in step S3 into films of corresponding specifications and sizes according to the design drawings, coat or 3D print a conductive silver paste layer on both ends of the film, and connect copper wire electrodes by spot welding or adhesive to obtain a polyurethane conductive heating composite film.
[0017] Among them, in step S1, the preparation method of polyurethane conductive heating masterbatch is to mix isocyanate, polyol, chain extender, catalyst, antioxidant, flame retardant, highly dispersed carbon nanotubes, and waterproofing agent according to weight proportions, react at a temperature of 70-90°C for 6-8h to generate a polyurethane precursor, and granulate the polyurethane precursor using a granulator to obtain polyurethane conductive heating masterbatch.
[0018] The extruder and granulator are both conventional structures used in the prior art and will not be described in detail here.
[0019] Wherein, in step S3, the material baked in step S2 is extruded by an extruder, wherein the screw temperature is 170-220°C and the die head temperature is 170-220°C.
[0020] Example 2 The embodiment of the present invention discloses a polyurethane conductive heating composite film, which is composed of the following raw materials in parts by mass: 40 parts of polyurethane conductive heating masterbatch, 3 parts of hydrolysis resistance agent, and 3 parts of anti-UV additive.
[0021] Among them, the polyurethane conductive heating masterbatch is composed of the following raw materials in parts by mass: 80 parts of isocyanate, 60 parts of polyol, 10 parts of chain extender, 6 parts of catalyst, 3 parts of antioxidant, 15 parts of flame retardant, 30 parts of highly dispersed carbon nanotubes, and 3 parts of waterproofing agent.
[0022] The preparation method of the polyurethane conductive heating composite film is the same as that of Example 1.
[0023] Example 3 An embodiment of the present invention provides a seat heating film, which is made of multiple polyurethane conductive heating composite films connected in series and is equipped with a protective cover, a temperature control device, a temperature sensor, a power supply and other devices to obtain a polyurethane conductive heating film workpiece, which is applied to car seats and can achieve seat heating and rapid temperature increase at a low voltage of 12V-36V.
[0024] Verification Example The polyurethane conductive heating composite film prepared by the present invention was subjected to experimental verification tests, and the verification data obtained are shown in the following table: Table 1 Test report of polyurethane conductive heating composite film
[0025] As shown in the above table, the polyurethane conductive heating composite film prepared by the present invention is a new type of heating material, has good mechanical properties, is very easy to be processed into various specifications and sizes of seat heating films, and can be mass-produced.
[0026] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0027] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A polyurethane conductive heating composite film, characterized in that: It is composed of the following raw materials in parts by weight: 20-40 parts of polyurethane conductive heating masterbatch, 1-3 parts of hydrolysis resistance agent, 0.1-3 parts of anti-UV additive.
2. A polyurethane conductive heating composite film according to claim 1, characterized in that: The polyurethane conductive heating masterbatch is composed of the following raw materials in parts by mass: 50-80 parts of isocyanate, 40-60 parts of polyol, 8-10 parts of chain extender, 4-6 parts of catalyst, 1-3 parts of antioxidant, 5-15 parts of flame retardant, 15-30 parts of highly dispersed carbon nanotubes, and 1-3 parts of water repellent.
3. A method for preparing a polyurethane conductive heating composite film, characterized in that: The steps include: S1. preparing polyurethane conductive heating masterbatch; S2. Mix the polyurethane conductive heating masterbatch, hydrolysis resistant agent and UV resistant additive according to the weight ratio, put them into the extruder baking chamber, and preheat at 100-130°C; S3, extruding, cooling, and stretching the material baked in step S2 to obtain a film; S4. Cut the film obtained in step S3 into films of corresponding specifications and sizes, apply a conductive silver paste layer on both ends of the film by coating or 3D printing, and connect copper wire electrodes by spot welding or adhesive to obtain a polyurethane conductive heating composite film.
4. The method for preparing a polyurethane conductive heating composite film according to claim 3, characterized in that: In the step S1, the preparation method of the polyurethane conductive heating masterbatch is to mix isocyanate, polyol, chain extender, catalyst, antioxidant, flame retardant, highly dispersed carbon nanotubes, and waterproofing agent according to weight proportions, react at a temperature of 70-90°C for 6-8h to generate a polyurethane precursor, and granulate the polyurethane precursor using a granulator to obtain the polyurethane conductive heating masterbatch.
5. The method for preparing a polyurethane conductive heating composite film according to claim 3, characterized in that: In step S3, the thickness of the film obtained is 0.08 mm-4 mm.
6. The method for preparing a polyurethane conductive heating composite film according to claim 3, characterized in that: In the step S3, the material baked in the step S2 is extruded by an extruder, wherein the screw temperature is 170-220°C and the die temperature is 170-220°C.