阅读说明：本技术 具有ptc效应的加热膜材料及其制备方法 (Heating film material with PTC effect and preparation method thereof ) 是由 陈新江 其他发明人请求不公开姓名 于 2018-06-14 设计创作，主要内容包括：本发明公开了一种具有PTC效应的加热膜材料及其制备方法。所述制备方法包括如下步骤：将导电材料、PTC添加剂分别与溶剂混合形成导电材料分散液、PTC添加剂分散液；将所述导电材料分散液与PTC添加剂分散液均匀混合,形成混合溶液；去除所述混合溶液中的溶剂,获得PTC包覆导电材料颗粒；将所述PTC包覆导电材料颗粒在惰性气氛中于300-500℃煅烧1-3h,获得PTC包覆导电材料；将所述PTC包覆导电材料与高分子树脂、溶剂、分散剂与偶联剂调配形成均匀浆料；将所述浆料制成膜材料,并与基膜复合。本发明的方法简单易行,可控性好,制备得到的PTC效应的加热膜材料温度系数可调,增加了加热膜材料应用的可控性、安全性,适用于大规模生产应用。(The invention discloses a heating film material with PTC effect and a preparation method thereof. The preparation method comprises the following steps: respectively mixing a conductive material and a PTC additive with a solvent to form a conductive material dispersion liquid and a PTC additive dispersion liquid; uniformly mixing the conductive material dispersion liquid and the PTC additive dispersion liquid to form a mixed solution; removing the solvent in the mixed solution to obtain PTC coated conductive material particles; calcining the PTC-coated conductive material particles for 1-3h at the temperature of 500 ℃ in an inert atmosphere to obtain a PTC-coated conductive material; mixing the PTC coated conductive material with high molecular resin, a solvent, a dispersant and a coupling agent to form uniform slurry; and preparing the slurry into a membrane material, and compounding the membrane material with a base membrane. The method is simple and easy to implement, has good controllability, and the prepared heating film material with the PTC effect has adjustable temperature coefficient, increases the controllability and the safety of the application of the heating film material, and is suitable for large-scale production and application.)

1. A preparation method of a heating film material with PTC effect is characterized by comprising the following steps:

respectively mixing a conductive material and a PTC additive with a solvent to form a conductive material dispersion liquid and a PTC additive dispersion liquid;

uniformly mixing the conductive material dispersion liquid and the PTC additive dispersion liquid to form a mixed solution;

removing the solvent in the mixed solution to obtain PTC coated conductive material particles;

calcining the PTC-coated conductive material particles for 1-3h at the temperature of 500 ℃ in an inert atmosphere to obtain a PTC-coated conductive material;

mixing the PTC coated conductive material with high molecular resin, a solvent, a dispersant and a coupling agent to form uniform slurry;

and preparing the slurry into a membrane material, and compounding the membrane material with a base membrane.

2. The method of claim 1, wherein: the PTC coated conductive material comprises 60 wt% -90 wt% of conductive material and 5 wt% -40 wt% of PTC additive.

3. The production method according to claim 1 or 2, characterized in that: the PTC additive comprises nano SiO₂Nano Al₂O₃、TiO₂、BaTiO₃、ZrO₂Any one or a combination of two or more of them.

4. The production method according to claim 1 or 2, characterized in that: the conductive material comprises any one or the combination of more than two of carbon nano tubes, fullerene, graphene, carbon fiber powder and carbon black.

5. The method of claim 1, wherein: the solvent is selected from volatile solvents, and the volatile solvents comprise any one or combination of more than two of methanol, ethanol, isopropanol, n-butanol, acetone, methyl butanone and methyl isobutyl ketone.

6. The method of claim 1, wherein: the mixed solution further comprises a surfactant, the surfactant comprising LAS.

7. The preparation method according to claim 1, wherein the preparation method specifically comprises: and removing the solvent in the mixed solution in a heating and volatilizing mode to obtain the PTC-coated conductive material particles.

8. The method of claim 1, wherein: the polymer resin is selected from any one or a combination of more than two of phenolic resin, epoxy resin and polyester resin.

9. The method of claim 1, wherein: the dispersant comprises any one or the combination of more than two of CTAB, DDAC, BYK, TECH and KV 01.

10. The method of claim 1, wherein: the coupling agent comprises a silane coupling agent KH 560.

11. The preparation method according to claim 1, wherein the preparation method specifically comprises: and coating the slurry on the surface of the patterned aluminum foil Mylar, drying, curing and molding to obtain the film material.

12. The method of claim 11, wherein: the drying temperature for drying, curing and forming is 100-200 ℃, and the drying time is 10-30 min.

13. The method of claim 1, further comprising: and winding the membrane material by using a winding machine, gluing the membrane material and/or the base membrane by using a hot melt adhesive gluing machine, and compounding the membrane material and the base membrane to form the heating membrane material.

14. The method of claim 1, wherein: the base film is a PET film.

15. A heating film material having a PTC effect prepared by the method of any one of claims 1 to 14.

16. A heating film material having a PTC effect according to claim 15, wherein: the heating film material comprises 0.1-30 wt% of PTC coated conductive material and 30-90 wt% of high molecular resin.

17. A heating film material having a PTC effect according to claim 15, wherein: the PTC effect of the heating film material with the PTC effect is 10-100%.

Technical Field

The invention particularly relates to a heating film material with PTC effect and a preparation method thereof, belonging to the technical field of heating film materials.

Background

With the gradual emergence of the energy crisis of the new century, the low-carbon and environment-friendly living idea gradually deepens into the aspect of life, and compared with the traditional heating mode, the electric floor heating does not need facilities such as a boiler room, coal storage, ash stacking and a pipe network, and does not produce pollutants such as waste gas, waste water and waste. In addition, the electric floor heating system is not provided with a heat transfer pipe network, so that energy loss in the heat transfer process is avoided. Therefore, electric floor heating is a great trend to replace other heating modes.

In recent years, carbon fiber electric floor heating and carbon crystal heating film electric floor heating which are gradually developed have the heating principle that after electrification, carbon atoms are mutually rubbed and collided to generate a large amount of heat and are released in a far infrared radiation energy mode with the wavelength of 8-15 mu m, so that the electric floor heating is safe and healthy and has a physical therapy effect. However, the floor heating temperature can only be controlled by an external circuit system at present, but the surface temperature of the heating material cannot be monitored, and when the heat of the heating material is dissipated badly to generate heat accumulation, the local temperature rises, so that fire hazard is easily generated.

At present, the PTC high polymer material is mainly composed of high-density polyethylene, low-density polyethylene and other additives, the polyethylene is solid, the processing process needs to be carried out in a melting state, and the component materials are purely physically mixed, so that the interface binding property is poor, the mixing is uneven and the performance is unstable.

Disclosure of Invention

The invention mainly aims to provide a heating film material with PTC effect and a preparation method thereof, so as to overcome the defects of the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention comprises the following steps:

the embodiment of the invention provides a preparation method of a heating film material with PTC effect, which comprises the following steps:

respectively mixing a conductive material and a PTC additive with a solvent to form a conductive material dispersion liquid and a PTC additive dispersion liquid;

uniformly mixing the conductive material dispersion liquid and the PTC additive dispersion liquid to form a mixed solution;

removing the solvent in the mixed solution to obtain PTC coated conductive material particles;

calcining the PTC-coated conductive material particles for 1-3h at the temperature of 500 ℃ in an inert atmosphere to obtain a PTC-coated conductive material;

mixing the PTC coated conductive material with high molecular resin, a solvent, a dispersant and a coupling agent to form uniform slurry;

and preparing the slurry into a membrane material, and compounding the membrane material with a base membrane.

The embodiment of the invention provides a heating film material with PTC effect, which is prepared by the method.

Compared with the prior art, the method for preparing the heating film material with the PTC effect is simple and easy to implement, good in controllability, and suitable for large-scale production and application, and the temperature coefficient of the prepared heating film material is adjustable, so that the controllability and the safety of the application of the heating film material are improved.

Drawings

FIG. 1 is a schematic diagram of a coating process according to an exemplary embodiment of the present invention;

FIG. 2 is a schematic diagram of coating and bonding according to an exemplary embodiment of the present invention;

fig. 3 is a graph showing the relationship between the power and the temperature of the heat generating film with PTC effect according to an exemplary embodiment of the present invention.

Detailed Description

In view of the deficiencies in the prior art, the inventors of the present invention have made extensive studies and extensive practices to provide technical solutions of the present invention. The technical solution, its implementation and principles, etc. will be further explained as follows.

One aspect of the embodiments of the present invention provides a method for preparing a heating film material having a PTC effect, including the steps of:

respectively mixing a conductive material and a PTC additive with a solvent to form a conductive material dispersion liquid and a PTC additive dispersion liquid;

uniformly mixing the conductive material dispersion liquid and the PTC additive dispersion liquid to form a mixed solution;

removing the solvent in the mixed solution to obtain PTC coated conductive material particles;

calcining the PTC-coated conductive material particles for 1-3h at the temperature of 500 ℃ in an inert atmosphere to obtain a PTC-coated conductive material;

mixing the PTC coated conductive material with high molecular resin, a solvent, a dispersant and a coupling agent to form uniform slurry;

and preparing the slurry into a membrane material, and compounding the membrane material with a base membrane.

Further, the PTC cladding conductive material comprises 60 wt% -90 wt% of conductive material and 5 wt% -40 wt% of PTC additive.

In some more specific embodiments, the PTC additive is nano SiO₂Nano Al₂O₃、TiO₂、BaTiO₃、ZrO₂One or a combination of two or more of them, but not limited thereto.

In some more specific embodiments, the conductive material is one or a combination of two or more of carbon nanotube, fullerene, graphene, carbon fiber powder, and carbon black, but is not limited thereto.

In some more specific embodiments, the solvent is selected from volatile solvents including, but not limited to, any one or a combination of two or more of methanol, ethanol, isopropanol, n-butanol, acetone, methyl butanone, and methyl isobutyl ketone.

In some more specific embodiments, the mixed solution further comprises a surfactant including LAS to improve the interfacial properties of the conductive material and the PTC additive.

In some more specific embodiments, the inert gas is one of nitrogen, helium, and argon, but is not limited thereto.

In some more specific embodiments, the polymer resin is one or a combination of two or more of a phenolic resin, an epoxy resin, and a polyester resin, but is not limited thereto.

In some more specific embodiments, to achieve uniform dispersion of the nanoparticles, the dispersant is selected from one or a combination of two of CTAB, DDAC, BYK, TECH, KV01, but is not limited thereto.

In some more specific embodiments, in order to enhance the interfacial bonding force between the solid particles and the resin, the coupling agent is selected from a silane coupling agent KH 560.

In some more specific embodiments, the preparation method specifically comprises: and removing the solvent in the mixed solution in a heating and volatilizing mode to obtain the PTC-coated conductive material particles.

In some more specific embodiments, the preparation method specifically comprises: and coating the slurry on the surface of the patterned aluminum foil Mylar, drying, curing and molding to obtain the film material.

Preferably, the drying temperature for drying, curing and forming is 100-200 ℃, and the drying time is 10-30 min.

In some more specific embodiments, the preparation method further comprises: and winding the membrane material by using a winding machine, gluing the membrane material and/or the base membrane by using a hot melt adhesive gluing machine, and compounding the membrane material and the base membrane to form the heating membrane material.

In some more specific embodiments, the base film is a PET film.

The embodiment of the invention also provides the heating film material with the PTC effect prepared by the method.

Further, the heating film material comprises 0.1 wt% -30 wt% of PTC coated conductive material and 30 wt% -90 wt% of high polymer resin.

Further, the PTC effect of the heating film material having PTC effect is 10% to 100%.

In some more specific embodiments, a method for preparing a heating film material having a PTC effect comprises the steps of:

(1) preparing a dispersion liquid by respectively mixing a conductive material, a PTC additive and a volatile solvent;

(2) mixing the two dispersions according to a proportion, and adding a small amount of surfactant for improving the interface of the conductive material and the PTC additive;

(3) uniformly mixing the mixed solution, and heating to volatilize the solvent to form PTC-coated conductive material particles;

(4) after grinding the mixed particles, calcining the mixed particles for 1h in an inert gas atmosphere at the temperature of 300-500 ℃ to ensure that the conductive material is firmly combined with the PTC;

(5) blending the PTC coated conductive material prepared in the step (4), the polymer resin, the solvent, the dispersant and the coupling agent according to a certain proportion, and uniformly stirring the slurry;

(6) coating the prepared slurry on the surface of the patterned aluminum foil Mylar by using a coating machine, and drying, curing and forming;

(7) winding the film material cured in the step (6) by using a winding machine;

(8) and (5) gluing the film material rolled in the step (7) by using a hot melt adhesive gluing machine, compounding the film material with the PET film, and rolling.

Preferably, in the step (6), the drying temperature for drying, curing and forming is less than or equal to 200 ℃, and the drying time is less than or equal to 30 min.

In a preferred embodiment of the present invention, the conductive material and the PTC additive may be prepared into dispersions with a volatile solvent, and then the two dispersions are mixed in proportion, and a small amount of surfactant for improving the interface between the conductive material and the PTC additive is added, and the solvent is heated to volatilize the solvent, so as to form PTC coated conductive material particles; and then grinding the mixed particles, calcining for 1h in an inert gas atmosphere at the temperature of 300-500 ℃ to ensure that the conductive material is firmly combined with the PTC, then blending the coated particle material, the polymer resin, the solvent, the dispersing agent and the coupling agent according to a certain proportion, and uniformly stirring the slurry to obtain the slurry. The added dispersing agent and coupling agent can enhance the uniformity and the interfacial property of the conductive material, the PTC additive and the polymer resin in the slurry.

The invention provides a preparation method of a heating film material with a PTC effect, which comprises the steps of firstly preparing a PTC coating conductive material, dispersing the coating material, a coupling agent and a dispersing agent in a volatile solvent, then uniformly mixing the volatile solvent with a high molecular resin to obtain a slurry, coating the slurry on the surface of an aluminum foil Mylar, drying and curing to obtain a resistance film material, then coating a hot melt adhesive by adopting a hot melt adhesive coating device, pressing, rolling and curing to obtain the heating film material with the PTC effect. The heating film material formed by the method has obvious PTC effect, and the performance of the PTC coated conductive material can be adjusted by adjusting the type and the proportion of the PTC additive, so that the temperature coefficient of the PTC effect is changed.

The method is simple and easy to implement, has good controllability, and the prepared heating film material with the PTC effect has adjustable temperature coefficient, increases the controllability and the safety of the application of the heating film material, and is suitable for large-scale production and application.

The technical solution, the implementation process and the principle thereof will be further explained with reference to the drawings and the specific embodiments.