CN2110908U

CN2110908U - Thermal resistor made of flexible conduction high molecular composite material

Info

Publication number: CN2110908U
Application number: CN 91228158
Authority: CN
Inventors: 曾宪富; 霍玉云
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-11-06
Filing date: 1991-11-06
Publication date: 1992-07-22

Abstract

The utility model discloses a thermal resistor made of flexible conducting macromolecular composite materials. The utility model uses flexible conducting macromolecular composite materials as a main body of the thermal resistor, and the basal body of the flexible conducting macromolecular composite materials adopts chloroprene rubber class (CR) or (and) silicon rubber class (SIR). The main body which forms a plate shape, or a bead shape, or a cylinder shape is provided with at least two silver paste sintering diffusion type or metal burial type ohmic contact electrodes and corresponding soft multi-strand metal thread electrode leads. The utility model has the characteristic of flexibility so that the thermal resistor can be designed into various shapes and areas, particularly a plate-shaped sensitive type positive temperature coefficient thermal resistor with a large contact area in the normal temperature zone. The utility model also has the advantages of stable performance, low price, and thereby, the utility model is suitable for large scale industrial production.

Description

Thermal resistor made of flexible conduction high molecular composite material

The utility model relates to the thermistor of the positive temperature coefficient that is made of the compliant conductive polymer composite.

PTC thermistor device is widely used in electronic circuits such as current limliting, temperature adjustment temperature control, present this quasi-resistance device or constitute or make with barium titanate based semiconductor ceramic material with single-crystal semiconductor material, its manufacturing process is all complicated, cost an arm and a leg, the thermistor finished product rate of normal temperature (40-100 ℃) is low, and silicon materials can only make film-type, do not make the large tracts of land thermistor of body material.

The purpose of this utility model is to propose a kind of responsive to temperature district to can be normal temperature type, and manufacturing process is simple, and price is lower, makes the flexible body material-type positive temperature coefficient thermistor of different shape easily, particularly large-area body material-type thermistor.

Above-mentioned purpose is achieved through the following technical solutions:

A, directly adopt with chlorine dibutyl glue kinds (CR) or (with) silicone rubber kinds (SIR) is the material of main part of the compliant conductive polymer composite of matrix as thermistor, the body shape structure of thermistor make plate-like or pearl cylindric;

B, on the main body of thermistor, make the Ohm contact electrode that the silver slurry sintering diffused be no less than two or metal are buried type;

C, the Ohm contact electrode on the thermistor main body draw and connect the strands of metal wire line as contact conductor.

Above-mentioned said compliant conductive polymer composite as the thermistor material of main part be with chlorine dibutyl glue kinds (CR) or (with) silicon rubber (SIR) is matrix, include conductive filler, its composition composition be conductive filler account for chlorine dibutyl glue kinds (CR) or (with) the 15%-60%(percentage by weight of silicon rubber (SIR) basis material).With above-mentioned basis material and conductive filler be equipped with suitable adjuvants or (with) coupling agent promptly forms said flexible temperature-sensitive resistance body through mixing, die mould, moulding, sulfuration (or curing).

Ohm contact electrode on the thermistor main body can be made like this, the one, the electrode area on main body (as two ends) is coated the low-temperature silver slurry, be bonded together together with soft strands of metal wire line electrode lead-in wire, sintering is about one hour in 120 ℃ of baking ovens, make silver ion slowly be diffused into the conductive polymer composite material surface, form diffusion layer, be silver slurry sintering diffused Ohm contact electrode; The one, when the machine-shaping of thermistor main body, earlier imbed the woven wire strip electrode in electrode area, to solidify with the resistance body of buried electrodes again, and be metal and bury the type Ohm contact electrode, at this moment can be on metal electrode wire electrode wire bonds as many.

Usually the Ohm contact electrode on the thermistor has two or four (two are heating electrode in the middle of during four electrodes).Draw two electrical leads or four electrical leads thus.

On the main body outer surface of thermistor, be coated with one deck insulating heat-conductive protective layer usually.This insulating heat-conductive protective layer can spray or the dip-coating resistance body by spraying of thermistor main body or dip-coating insulation heat conduction are coated with lacquer as adopting organic-silicon-modified cold coating or other analog, and drying forms again.

Resistance value of the present utility model is not only with resistance body shape (comprising sectional area, length), resistivity (can be 10 ²Ω cm-10 ⁸Between the Ω cm) relevant, and it is relevant with the manufacture craft of electrode, when resistance body length more in short-term, the silver ion diffusion layer degree of depth of silver slurry sintering diffused Ohm contact electrode is bigger to the resistance value influences of thermistor, but under the definite situation of electrode manufacture craft condition (temperature, time), the resistance and the Changing Pattern of the thermistor of definite shape have consistency.

This thermistor bear resistance body material and the electrode area that power depends mainly on employing, to CR type (chlorine dibutyl glue kinds matrix) generally by every cm ²Electrode area, 1W design; Generally press every cm for SIR type (silicone rubber kinds matrix) ²Electrode area 2W design.

The utility model by material of main part prescription design be easy to make thermistor normal temperature district (40 ℃-100 ℃) scope in the electricalresistivity with the temperature rising increase that suddenlys change, its positive temperature coefficient α can reach 0.3-0.4/ ℃, material is insensitive to impurity, requiring general neoprene and silicon rubber is that basic material gets final product, and shapes easily, can be processed into Any shape and area, stable performance, the rate of finished products height, cheap, be fit to large-scale production.The utility model is also owing to have a flexibility, thereby is more suitable for being fitted in than general thermistor on the surface of heat transfer object of complicated shape.

Below be the drawing explanation of utility model:

Fig. 1 is the shape and structure schematic diagram of plate-like flexible thermal sensitive resistor;

Fig. 2 is cross section (its Ohm contact electrode the is silver slurry sintering diffused) structural representation of Fig. 1;

Fig. 3 is the shape and structure schematic diagram of the plate-like flexible thermal sensitive resistor of four electrodes;

Fig. 4 is cross section (its Ohm contact electrode is that metal the is buried type) structural representation of Fig. 3;

Fig. 5 is the flexible thermistor shape and structure of a pearl schematic diagram;

Fig. 6 is cylindric flexible thermistor shape and structure schematic diagram.

Embodiment one

Present embodiment as shown in Figure 1 and Figure 2, the material of the main body of flexible thermal sensitive resistor (1) is to be matrix with neoprene (CR), is the compliant conductive polymer composite of conductive filler with the carbon black, its resistivity is 10 ³Ω cm; the shape and structure of resistor main body (1) is 2mm * 2.5mm * 2.5mm cuboid; the resistor two ends have silver slurry sintering diffused Ohm contact electrode (2); electrode area is 2.5mm * 2.5mm; be bonded with stranded copper wire line electrode lead-in wire (3) on the electrode (2); be coated with insulating heat-conductive protective layer (5) on the resistor outer surface, the organic-silicon-modified cold coating spraying of the W37-51 type of a certain amount of 325 order mica powders of the protective layer used adding of this insulating heat-conductive back oven dry forms.

The resistance of this flexible thermistor is 0.4 Ω, and power is 1/4th W(watts).

Embodiment two

Present embodiment as shown in Figure 3, Figure 4, for having the flexible thermal sensitive resistor of 4 electrodes, resistor main body (1) is plate-like, its material is to be matrix with silicon rubber (SIR), with the carbon black is the compliant conductive polymer composite of conductive filler, resistor main body two ends and middle part are provided with four metals and bury type Ohm contact electrode (4) resistor main body, the electrode at two ends is a measurement electrode, two electrodes at resistor main body middle part are heating electrode, can carry out the active thermal control that adds to the resistance of thermistor thus.Weld out stranded copper wire line electrode lead-in wire (3) in the end of electrode, the outer surface of resistor is coated with insulating heat-conductive protective layer (5).

Embodiment three

Pearl flexible thermal sensitive resistor has bead resistance device main body (6) as shown in Figure 5, and material is the compliant conductive polymer composite of CR mold base, and Ohm contact electrode (2) is a silver slurry sintering diffused, and (3) are stranded copper wire line electrode lead-in wire.

Embodiment four

Cylindrical as shown in Figure 6 flexible thermal sensitive resistor, cylindric resistor main body (7) material is the compliant conductive polymer composite of CR mold base, and Ohm contact electrode (2) is a silver slurry sintering diffused, and (3) are stranded copper wire line electrode lead-in wire.

Claims

1, a kind of positive temperature coefficient thermistor comprises the resistor main body, and Ohm contact electrode and contact conductor is characterized in that:

The main material of a, resistor be with chlorine dibutyl glue kinds (CR) or (with) silicone rubber kinds (SIR) is the compliant conductive polymer composite of matrix, its shape and structure can be plate-like or pearl or cylindric;

Have the silver slurry sintering diffused or the metal that are no less than two on b, the resistor main body and bury the type Ohm contact electrode;

C, contact conductor are soft strands of metal wire line.

2, by the described positive temperature coefficient thermistor of claim 1, it is characterized in that being coated with one deck insulating heat-conductive protective layer on the said resistor main body outer surface.

3,, it is characterized in that said contact conductor directly bonds or is welded on the Ohm contact electrode by the described positive temperature coefficient thermistor of claim 1.