JPH01280549A - Conductive rubber laminated material - Google Patents

Abstract

PURPOSE:To furnish a conductive rubber laminated material which can become sufficiently fitted to unevenness of a surface of a use object and exhibits efficient heating function and thermal insulating function, by a method wherein a layer composed of a rubber material to which a foaming agent is added, and a layer composed of a rubber base material to which conductive particles are added, are laminated. CONSTITUTION:A mixture by kneading a rubber base material as a matrix and a foaming agent, and a mixture by kneading the rubber base material and conductive particles are, in a sheet state, laminated and are vulcanized. For the laminated material, a layer by laminating only general rubber base material layers is also used. Otherwise a mixture by kneading the rubber base material and conductive particles, is covered by an insulating layer. Said layer and another layer are laminated to be also used. Conductive carbon black is especially preferable as the conductive particle. A compounded amount of the conductive particle is 5-100pts.wt. to 100pts.wt. rubber. As the foaming agent, an inorganic foaming agent, a nitroso compound, an azo compound, sulfonyl hydrazide, etc. are exemplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a conductive rubber laminate used as a heating material, a heat insulating material, etc.

(Prior art) Conventionally, rubber materials used as heating materials, heat insulating materials, etc. are divided into those that are energized and those that are not energized. It is laminated with an insulating layer and a protective layer to prevent deformation and damage due to contact with other objects, and even those that do not conduct electricity are used in conjunction with a protective layer to prevent deformation and damage due to contact with other objects. has been done.

Items that come into contact with the human body are laminated with woven fabric, non-woven fabric, etc. to alleviate the discomfort caused by the hardness of the rubber material.

(Problems to be Solved by the Invention) The conventional heating rubber materials and heat-retaining rubber materials described above have poor elasticity and deformability, so they cannot be used in contact with objects or places with small irregularities or the human body. In case.

They may adapt to the unevenness of their surfaces, making it impossible to contact them evenly, creating a space between them and the surface to be contacted, resulting in a decrease in functionality.

Furthermore, when used in a slippery place or wrapped around the human body, woven fabrics or the like have weak gripping power and may not function satisfactorily.

An object of the present invention is to provide a conductive rubber laminate that can sufficiently conform to the unevenness of the surface of the object to be used and exhibits excellent heating and heat retention functions.

(Means for Solving the Problems) The present invention adopts the following configuration in consideration of the problems in the conventional conductive rubber laminate described above.

■゛Lamination of conductive rubber layer and sponge rubber layer.

■ Lamination of conductive rubber layer, sponge rubber layer and other general purpose rubber layers.

■ Lamination of a conductive rubber layer and a sponge rubber layer covered with an insulating layer.

■ Lamination of a conductive rubber layer, a sponge rubber layer, and a general-purpose rubber layer covered with an insulating layer.

The conductive particles used in this blasting include carbon black represented by Ketschen black and BCF carbon black, graphite, carbon fiber, metal-plated synthetic fiber, nickel powder, copper powder, gold powder,
Examples include metal powder such as aluminum powder, and metal fibers such as aluminum fiber, brass fiber, and nickel fiber, but conductive carbon black is particularly desirable.

The amount of conductive particles blended varies depending on the type of conductive particles and the required conductivity, but when conductive carbon black is used, it is 5 to 100 parts by weight per 100 parts by weight of rubber; If you use rubber 1
The amount is 5 to 35 parts by weight per 00 parts by weight.

Regarding sponge rubber, a foaming agent or a foaming agent and a foaming aid are blended and heated, so that the foaming agent decomposes and forms a cell structure in the polymer.

Blowing agents include inorganic blowing agents, nitroso compounds, azo compounds, sulfonyl hydrazides, etc. Some nitroso compounds require blowing aids.1 Blowing aids include salicylic acid and its compounds. is used.

The amount of the foaming agent and foaming aid added is as follows with respect to 100 parts by weight of rubber.

Foaming agent: 1 to 30 parts by weight, preferably 5 to 15 parts by weight Foaming aid; 1 to 30 parts by weight, preferably 5 to 15 parts by weight In the present invention, a rubber base material to be a matrix and a foaming agent are kneaded. Then, conductive particles are kneaded into a rubber base material, which is then laminated into a sheet and vulcanized.

A laminate obtained by laminating a layer made only of a general-purpose rubber base material on the above-mentioned laminate may also be used.

Alternatively, a rubber base material kneaded with conductive particles may be coated with an insulating layer and laminated with other layers.

These laminates can be used for various purposes by laminating two, three or four or more layers to produce various composites.

For lamination, vulcanization or adhesive is used.

(Function) In the present invention, since a layer in which conductive particles are added to a rubber base material serving as a matrix and a layer in which a foaming agent and a foaming aid are added are laminated as separate bodies, the sponge rubber layer deforms. Even if the conductive rubber layer is heated, the conductive rubber layer is not deformed, the conductive particles in the rubber matrix are not cyclized, and the conductivity is not adversely affected, so that good conductivity is maintained.

Furthermore, in such a laminate, one in which the conductive layer is covered with an insulating layer can be used with peace of mind since there is no risk of electrical leakage or electric shock.

In addition, when high foamability or conductivity is not required,
Although it is possible to adjust the amount of sponge rubber and conductive particles, it is also possible to
In addition to being able to control the degree of foamability and conductivity, it also increases volume and provides a reinforcing effect.

(Example) (1) Sponge rubber ABC Nitrile rubber 100 ← ← (JSR
N 220S) Zn0 5 ← ← Stearic acid 1 ← ← Nuipake
5 ← ←5 illitin Z 86
40 4- 4-White SB
30 (-←Nip seal VN3 10
← ←DOP 15 ← ←
Resino Blue 1500 5 ← ← Sulfur
2 ← ← Prompt DM
O, 6← ←Prompt CZ O, 9←
←DDT (Cell Microphone) 9 7.5 4.5
Selton NP 7 10 10 (2) Conductive rubber b Nitrile rubber 100 ← (JSRN 2
37) ZnO5 ← Stearic acid 1.5 ← Ketchen Black EC1015 Sulfur 2 ← T S 1.5 ← T T
O,5← The above mixture was kneaded with an open roll at 60 to 70°C, and the sponge rubber was open-vulcanized and formed into a 2 mm thick sheet, and the conductive rubber was vulcanized under pressure to a 0. 3
A sheet with a thickness of mm was obtained.

The sponge rubber expanded in volume as shown below, and the electrical resistance of the conductive rubber was a b volume resistivity (Ω·Cm) 8 2 .

As a comparative example, 2m1 of this was prepared by mixing only conductive rubber.
When compared with a sheet prepared with a thickness of 11, it was confirmed that a) it felt better when wrapped around the arm. (For antistatic material) b Electrodes are attached to the laminate to create unevenness (mountain height 0.5Il1)
11) When placed on a certain plastic and heated by applying a voltage, it was confirmed that the time required for uniform heat generation was shorter than that of the comparative example. (Heating element) It was also confirmed that when using the heating element by passing current through it, if the heating element is covered with an insulating layer, no leakage will occur and it is safe.

In addition, the insulating layer is a vinyl chloride sheet (thickness 100 μm)
Or rubber latex coating film (thickness 100μl11)
was used.

(Effects of the Invention) The conductive rubber laminate according to the present invention has a layer made of a rubber base material to which a blowing agent has been added and a layer made of a rubber base material to which conductive particles are added, as described above. Because of this, when used on an object with an uneven surface, it fits onto the surface of the object and does not form a space, so it exhibits good heating and heat retention functions.

Claims (1)

[Scope of Claims] 1. A conductive rubber laminate comprising a layer made of a rubber base material added with a foaming agent and a layer made of a rubber base material added with conductive particles. 2. A patent claim in which three or more layers are laminated, including a layer made of a rubber base material to which a foaming agent has been added, a layer made of a rubber base material to which conductive particles have been added, and a non-conductive rubber layer. The conductive rubber laminate according to scope 1. 3. The conductive rubber laminate according to claim 1 or 2, wherein the rubber base material to which conductive particles are added is coated with an insulating layer.