SU717204A1 - Electrically conductive paper - Google Patents

Description

The invention relates to the pulp and paper industry and relates to the field of production of electrically conductive paper. This paper can be used in electrical industry for the manufacture of flat-conducting materials operating at low voltages. Known conductive buoyaga containing cellulose and graphite powder l j. A disadvantage of the known paper is its high electrical resistance. The closest to the technical essence is semiconducting cable paper containing carbon-containing fiber, cellulose, penetrating reagent and precipitant r2j. The disadvantage of this paper is that it has high electrical resistance: 4.9 210 cm / cm. The purpose of the invention is to reduce the electrical resistance of the paper. This goal is achieved by the fact that, as a carbon-containing aeol window, paper contains graphitized cellulose hydrate with a specific electrical resistance of not more than 0.13 ohm. see and fiber length, 5-10 mm in the following ratio of components (; wt.%): ... Cellulose Graphitized Fiber5-83 Sizing Agent2 3 Precipitant3-5 Paper is made as follows Graphitized fiber (fiber and graelen) is dispersed in a roll while the drum is raised until the fibers are completely released at a concentration of 1-5%, the pulp is ground to 40-5O ShR . Then the dispersions are mixed and the composition is made, carefully mixed.

they are sewn and glued with rosin glue and alum.

The finished pulp is served in. machine pool and further to the paper machine,

Example 1 In laboratory conditions, samples of electrically conductive paper with a content of graphitized fiber from 5 to 90% were made.

Paper composition, weight.

Table 1 shows the electrical resistance of these samples and, for comparison, the electrical resistance of laboratory paper samples of the same composition with carbon-containing fiber (carbon fiber) is given. Samples of paper are made under the same conditions, the weight of 1 m of paper is 140 g.

T a

faces

Electrical resistance

paper, Ohm / cm

 It follows from the table that when introducing electrically conductive graphitized fiber instead of carbon fiber (carbon fiber) into paper pulp, the electrical resistance of the paper decreases almost 1O times, this makes it possible to produce paper with a rather low electrical resistance, while maintaining sufficient mechanical strength of the paper.

Example 2. Under production conditions, paper was manufactured with a content of graphitized fiber in a paper composition of 12 to 24%.

Paper Composition: (wt.%): Graphitized Fiber12

Unbelina sulphate pulp 80

Rosin3

Alum5

Preparation of paper pulp produced in a roll with a basalt headset. The pulp was milled at a concentration of 3.8% to a grinding degree of 42 WR of a fiber length of 8.8 dg for 2. h. 5 minutes. The graphitized fiber was dispersed in a roll with a raised drum to obtain a uniform suspension of the fiber in water for 15 minutes.

The ground pulp was mixed with stirred graphitized fiber and glued with rosin glue, which was deposited on the fibers with alum.

Paper was poured on a paper machine at a bummass concentration of 0.85%, a pressure on the suction roll of 0.5 kgf / cm, the first press 2.0 kgf / cm, the second press 4, O kgf / cm. The temperature of the drying cylinders: a gradual increase from 40 to 135 C. Paper quality indicators are shown in Table 2.

Explosive effort, kg:

in the machine direction 11.0

 in the transverse direction NII6, O

Electrical resistance

in the machine direction, Ohm / cm, 60-7O. EXAMPLE 3. Paper Composition (Bes.%): Graphitized Fiber20 Sulfate unbleached cellulose Rosy Kvastsio, and Preparation of paper pulp were made in a roll with a basalt headset. The pulp was ground at a concentration of 2.2% to a grinding degree of 44 WF of a fiber length of 90 dg for 2 h 10 min. The graphitized fiber was dispersed in a roll with a raised drum

Mass, g / m

Thickness, mm Volume weight, g / cm

Breaking strength, kg;

in machine direction

in the transverse direction

Electrical resistance

in the machine direction

Ohm / cm table 2

4.9-1C 2-10

40-80

I

Claims (2)

4.9. until a uniform suspension of the fiber in water is obtained in a section 15 minutes. The milled tse Lyyulose was mixed with stirred graphitized fiber and glued with rosin glue; precipitator - alum. Paper was poured on a paper machine at a concentration of 0.64%, a pressure on the suction roll of 0.5 kgf / cm with the 1st press - 2.0 kgf / cm, the 2nd press4, 0 kgf / cm. The temperature of the drying cylinders: a gradual increase from 40 to 150 ° C. Paper quality indicators are given in Table 3, T a b l and c 3 77 Paper will be introduced into industrial sector in 1979-1980. When introducing this paper in the production of heating elements with their subsequent introduction on reproduction farms, only in the system of the Ministry of Agriculture of the RSFSR will an economic effect of 5.6 million rubles. per year with the annual release of 1OOOOO m heaters. Claims of the invention Electrically conductive paper containing carbon-containing fiber, cellulose, a sizing agent, a precipitator, such as to reduce electrical resistance. 4, as carbon-containing fiber, it contains graphitized hydrated cellulose fiber with a resistivity of about 0.13 ohms. cm and a fiber length of 5-10 mm in the following ratio of components (wt.%): Cellulose 9-90 Graphitized fiber 5-83 Sizing agent 2-3 Precipitate3-5 Sources of information taken into account during the examination 1. USSR author's certificate No. 161225 , cl. 1321 ID 3/00, 1964. 2. USSR author's certificate №423909, cl. 021 1343/00, 1972 (prototype).