Self-regulating heating element and manufacturing method thereof

Abstract

The invention discloses a self-regulating heating element. The self-regulating heating element comprises, by mass, 50-70 parts of low-density polyethylene, 15-30 parts of carbon black, 5-8 parts of flexibilizer, 3-5 parts of dispersing agents, 1-3 parts of diffusion oil, 0.5-0.8 part of antioxidant, 3-5 parts of compatilizer and 3-5 parts of plasticizer. The invention further discloses a manufacturing method of the self-regulating heating element. The method includes the following steps that obtained dried products are extruded out at the temperature of 170 DEG C to 210 DEG C under the pressure of 10 MPa to 15 MPa in a plastified mode; then abrasive tool moulding is conducted on a tinned wire, then tabletting is conducted, tabletting products with the thickness ranging from 0.9 millimeter to 1.3 millimeters are obtained and perforated, and finished products made of polymer thermistor materials are obtained. The self-regulating heating element is stable in resistance, high in resistance heat cycle repetition memory and more environmentally friendly, and more energy is saved.

Description

technical field

[0001] The invention relates to a thermistor material and a preparation method thereof, in particular to a self-limiting temperature electric heater and a preparation method thereof. Background technique

[0002] Frydman first discovered in 1945 that the composite material formed by using polymer as the matrix material and adding conductive carbon black exhibits a positive temperature coefficient (PTC) characteristic. At that time, it was not noticed because its characteristics were not very obvious. It was not until 1966 that Kohler rediscovered this phenomenon. And obtained a very obvious PTC effect, which has attracted great attention from the industry. The resistance of the material increases with the increase of temperature, and it rises sharply near the melting point of the polymer matrix, and the transition reaches several or even dozens of orders of magnitude, so it has switching characteristics. Organic polymers are compounded into conductive po...

Examples

Embodiment 1

[0030] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0031] 70 parts of low-density polyethylene,

[0032] 30 parts of carbon black,

[0033] 8 parts of toughening agent,

[0034] 4 parts of dispersant,

[0035] 2 parts diffusing oil,

[0036] 0.6 part of antioxidant,

[0037] 3 parts of compatibilizer,

[0038] 3 parts plasticizer.

[0039] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0040] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0041] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not co...

Embodiment 2

[0051] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0052] 60 parts of low-density polyethylene,

[0053] 20 parts of carbon black,

[0054] 7 parts of toughening agent,

[0055] 5 parts of dispersant,

[0056] 3 parts of diffusing oil,

[0057] 0.8 part of antioxidant,

[0058] 3 parts of compatibilizer,

[0059] 3 parts plasticizer.

[0060] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0061] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0062] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not c...

Embodiment 3

[0072] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0073] 50 parts of low-density polyethylene,

[0074] 15 parts of carbon black,

[0075] 5 parts of toughening agent,

[0076] 4 parts of dispersant,

[0077] 2 parts diffusing oil,

[0078] 0.6 part of antioxidant,

[0079] 5 parts of compatibilizer,

[0080] 5 parts of plasticizer.

[0081] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0082] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0083] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not...

technical field

[0001] The invention relates to a thermistor material and a preparation method thereof, in particular to a self-limiting temperature electric heater and a preparation method thereof. Background technique

[0002] Frydman first discovered in 1945 that the composite material formed by using polymer as the matrix material and adding conductive carbon black exhibits a positive temperature coefficient (PTC) characteristic. At that time, it was not noticed because its characteristics were not very obvious. It was not until 1966 that Kohler rediscovered this phenomenon. And obtained a very obvious PTC effect, which has attracted great attention from the industry. The resistance of the material increases with the increase of temperature, and it rises sharply near the melting point of the polymer matrix, and the transition reaches several or even dozens of orders of magnitude, so it has switching characteristics. Organic polymers are compounded into conductive po...

Examples

Embodiment 1

[0030] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0031] 70 parts of low-density polyethylene,

[0032] 30 parts of carbon black,

[0033] 8 parts of toughening agent,

[0034] 4 parts of dispersant,

[0035] 2 parts diffusing oil,

[0036] 0.6 part of antioxidant,

[0037] 3 parts of compatibilizer,

[0038] 3 parts plasticizer.

[0039] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0040] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0041] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not co...

Embodiment 2

[0051] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0052] 60 parts of low-density polyethylene,

[0053] 20 parts of carbon black,

[0054] 7 parts of toughening agent,

[0055] 5 parts of dispersant,

[0056] 3 parts of diffusing oil,

[0057] 0.8 part of antioxidant,

[0058] 3 parts of compatibilizer,

[0059] 3 parts plasticizer.

[0060] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0061] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0062] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not c...

Embodiment 3

[0072] A self-limiting temperature electric heater, including a base material and a tinned copper wire electrically connected thereto, in parts by mass, the base material includes the following components:

[0073] 50 parts of low-density polyethylene,

[0074] 15 parts of carbon black,

[0075] 5 parts of toughening agent,

[0076] 4 parts of dispersant,

[0077] 2 parts diffusing oil,

[0078] 0.6 part of antioxidant,

[0079] 5 parts of compatibilizer,

[0080] 5 parts of plasticizer.

[0081] The low-density polyethylene is granular, with a particle diameter of 2-4 mm and a density of 0.915-0.940 g / cm2.

[0082] The carbon black is in powder form, and its particle size is 30-40 nanometers.

[0083] The toughening agent is one of granular polyvinyl alcohol, carboxylated nitrile rubber and polyvinyl butyral, with a particle size of 2-4 mm. The toughening agent contains active groups, which can chemically react with the polymer in the material. After curing, it is not...