PTC inorganic composite material and preparation method and application thereof

An inorganic composite material and carbon material coating technology, which is applied to heating element materials, non-adjustable metal resistors, electrical components, etc., can solve the problems of affecting the service life of materials, uneven conductivity, and increasing costs, and achieve extended use The effect of life, overheating and power runaway increase, and stable performance

Active Publication Date: 2017-03-01
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(2) Install a thermostat and use the thermostat to monitor each board. On the one hand, the cost is greatly increased. On the other hand, in the case of a thermostat failure, it will cause local high heat, and a fire may occur in severe cases.
Such materials are not stable. In the process of repeated heating, polymer materials or silver will locally decompose, release gas, age, oxidize (silver) and a series of problems, resulting in uneven conductivity, flatulence, and gradual decrease in resistance. The function of PTC material is lost, which seriously affects the service life of the material itself

Method used

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  • PTC inorganic composite material and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) In nano-ceramic materials composed of metal oxides, non-metal oxides, and metal borides, the molar ratio of each element is 5-15% for Ti, 20-50% for Si, 1-5% for Fe, and B 5-10% for O, 50-70% for O;

[0035] 2) 75kg of the above-mentioned nano-ceramic material, 20kg of nano-scale graphite with a thickness below 100nm, and then add 0.5kg of polyvinyl alcohol and an appropriate amount of ethanol to a solution state, use a cell pulverizer to mix and pulverize for 30min, and control the speed at 800rpm;

[0036] 3) After evaporating ethanol to dryness, heat-treat the obtained product to remove polyvinyl alcohol. 2 Protect;

[0037] 4) After the heat treatment product is ground and sieved, it is evenly compounded with the carbon paste, and the addition ratio is 2wt%, that is, the carbon paste with PTC properties and enhanced far-infrared performance is obtained.

Embodiment 2

[0039] 1) In nano-ceramic materials composed of metal oxides and non-metal oxides, the molar ratio of each element is 10-20% for Ba, 5-30% for Ti, 5-10% for Si, and 5-10% for Ag. %, O is 50-75%;

[0040] 2) 95 kg of the above-mentioned nano-ceramic material, 10 kg of graphene oxide with a thickness below 50 nm, then add 5 kg of polyethylene glycol and an appropriate amount of ethanol to a solution state, and use a vacuum ball mill to perform ball milling for 2 hours at a speed of 500 rpm;

[0041] 3) After evaporating ethanol to dryness, heat treatment was carried out on the obtained product to remove polyethylene glycol. The heat treatment temperature was 150° C. 2 Protect;

[0042] 4) After the heat treatment product is ground and sieved, it is uniformly compounded with the carbon paste, and the addition ratio is 5 wt%, that is, the carbon paste with PTC properties and enhanced far-infrared performance is obtained.

Embodiment 3

[0044] 1) In nano-ceramic materials composed of metal oxides, non-metal oxides, and metal borides, the molar ratio of each element is 10-30% for Ti, 5-10% for Fe, 10-20% for Si, and 10-20% for Cu. 5-10% for Sn, 1-5% for Sn, 50-70% for O;

[0045] 2) 80kg of the above-mentioned nano-ceramic material, 1kg of graphene with a thickness below 30nm, and then add 1kg of polyethylene glycol and an appropriate amount of ethanol to a solution state, and 700W ultrasonic for 60min;

[0046] 3) After evaporating ethanol to dryness, heat treatment was carried out on the obtained product to remove polyethylene glycol. The heat treatment temperature was 150° C. 2 Protect;

[0047] 4) After the heat treatment product is powdered and sieved, it is uniformly compounded with the carbon paste, and the addition ratio is 4wt%, that is, the carbon paste with PTC properties and enhanced far-infrared performance is obtained.

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Abstract

The invention provides a PTC inorganic composite material, which is mainly prepared from the following raw materials (by weight): 75-95% of a nano-ceramic material, 1-20% of a graphite carbon material coating agent and 0.5-5% of a dispersant. A preparation method of the composite material comprises the following steps: mixing the nano-ceramic material and the graphite carbon material coating agent, adding the dispersant and a proper amount of ethanol and uniformly mixing to obtain a uniform solution, and carrying out heat treatment under the protection of inert gas at the temperature of no more than 200 DEG C. According to the PTC inorganic composite material of the embodiment, an inorganic material, namely the nano-ceramic material, is compounded with the graphite carbon material coating agent, and the carbon material is used for coating particles of the inorganic material so as to realize conductivity and internal insulation effects of the carbon material. The material can be applied to electrical heating materials, such as carbon crystal heating panels. Properties are more stable, and problems such as aging, bloating, etc. will be avoided. Properties of the carbon crystal panels are subversively enhanced, service life is greatly prolonged, and considerable economic benefit is also generated.

Description

technical field [0001] The invention relates to the field of preparation of composite materials with PTC properties, in particular to a PTC inorganic composite material and its preparation method and application. Background technique [0002] Carbon crystal heating plate is a new heating product. After nearly ten years of development, the technology is becoming more and more mature. Its characteristics are: 1. Subvert the heating tradition, save energy, protect the environment and reduce emissions, and adapt to the new requirements of the country and society; 2. There is no trouble of water seepage and leakage, and no trouble of uniform heating fee collection. It is easy to install and use, and it can be heated immediately when it is turned on; 3. It has the function of health care and physiotherapy; the wavelength is 8-18 microns, and people will stay in this environment for a long time, which is beneficial to the health of the body. 4. Relying on far-infrared heating and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85H05B3/14
CPCC04B41/5001C04B41/85H01C7/021C04B41/4539C04B41/0072H05B3/14
Inventor 张金柱袁征刘顶
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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