SU943366A1 - Method of producing fibrous material web - Google Patents

Description

(5) PLAYER FOR MANUFACTURING A FIBER BELT

one

The invention relates to methods for producing a web of fibrous material and can be used in pulp and paper production in the manufacture of sheet and coil non-combustible thermal insulation material or filter materials for filtering liquids and gases.

A known method of manufacturing a sheet of fibrous material, including the grinding of cellulose fibers, the dissolution of mineral fibers, blended. the dispersion of ground cellulose and mineral fibers, the introduction of a polymer, such as protein, and its subsequent precipitation by adding alum aluminum salts to a pH of 5 "0-5.5, followed by molding and drying.ij

The disadvantage of this method of making a sheet of fibrous material is TOi that the material obtained has sufficient MATERIAL

WITH STRENGTH only at significant (organic binder consumption, which, in turn, complicates the process and leads to a decrease in heat resistance and filtering properties of finished materials.

The closest in technical essence and the achieved effect to the proposed is a method of manufacturing a sheet of fibrous

14) material, including grinding of cellulose fiber, dissolving mineral fiber, forming a suspension of cellulose and mineral fibers, introducing an aluminum salt and

IS casting paper on paper or board machine. According to this method, the ground cellulose mill is mixed first with a suspension of mineral fiber, and

20 aluminum salt is introduced into the resulting mixture of fibers. As the aluminum salt using aluminum alum 2.

The disadvantage of this method of obtaining material is that the material obtained has an insufficient strength and uniformity of the web. To increase the strength of the material, a large amount of binder, such as 10 cellulose and 2 latex by weight of fiber, must be introduced into the resulting fiber mass.

 The purpose of the invention is to increase the strength and uniformity of the material.

The goal is achieved by the fact that in the method of producing sheet fiber material, including radmol cellulose fiber, dissolving mineral fiber, forming a suspension of cellulose and mineral fibers, introducing an aluminum salt and pouring a sheet on a paper or cardboard machine, dissolving mineral fiber is carried out in the presence of a mineral polybasic acid or its salt having a monovalent metal cation, and the introduction of an aluminum salt is carried out into a mass of ground cellulose fiber, wherein as the aluminum salt, aluminum chloride is used.

When using cellulosic fiber, mainly from hardwood, pa3MOfi is carried out up to 60-98 ° SH.

Dissolution of mineral fibers is carried out at pH 3.0-8.0.

Glass fibers of alkali or alkali silicate glass or basalt fibers are used as mineral fibers.

The degree of grinding of cellulose fiber 60-98 ° SR is due to the fact that when the degree of grinding is less than 60 SR, the strength of the fiber material decreases, which can be compensated only by increasing the consumption of cellulose fiber.

Dissolving mineral fiber at pH 0 in the presence of a polybasic acid or its salt allows the maximum negative potential of the fiber to be reached, thereby spreading the fiber bundles, since each fiber is associated with a negative charge that promotes mutual repulsion. However, at pH 3, a significant decrease in the negative potential of the fiber is observed, and there is little effect on the change in the G potential of the fiber.

The milled cellulose fiber is treated with aluminum chloride until a positive G-potential of the fiber is achieved.

It has been found that mixing such cellulosic fibers, having a positive surface charge, with mineral fibers, which have a negative surface charge, contributes to a better distribution of cellulosic fibers among the mineral fibers and to an increase in the strength of the sheet material as a whole.

Example 1. Silicate glass fiber of the brand M-20 is dissolved in a roll while the drum is lifted in water with pH adjusted to 3.0 with sulfuric acid. The pulp is ground to 98 CR in a conical mill at the end of the grinding, aluminum chloride is added to the mass in an amount necessary to change the surface charge of the cellulosic fibers to a positive Q-potential. After that, a suspension of cellulose and mineral fibers is formed by mixing them in a ratio, wt.%: Cellulose 10

Fiberglass90

From the resulting mixture of fibers, castings are prepared on a RapidKetten apparatus.

Prototype. Silicate glass fiber M-20 is dispersed in a roll while the drum is raised and the pulp milled to 98 CR is added in a ratio in May. %:

Cellulose 10 Fiberglass90

The mixture is treated with aluminum alum to a pH of 4.3 and then an emulsion is injected into the suspension (latex DMMA-65 HP in the amount of 2% to the weight of fibers. The resulting suspension is prepared by casting on the Rapid-Ketten apparatus.

Comparative results of testing the material obtained according to the invention. And the control is given in the table.

100

1.83

Uniform

100

100

100

100 .

1.6

1.2 0.76

0.9 0.6

Less Equal-Nerav-Equal-Unequal-Numeral Number-Dimensional Number on

EXAMPLE 2. Silica fiberglass is dispersed in a roll while the drum is raised in the presence of a phosphoric acid sodium salt at a pH of 6.0 and then adjusted to pH 8.0 by addition of alkali. The pulp is ground to grind and then treated with a solution of aluminum chloride to obtain a positive O potential. After displacing the fiberglass and cellulose fiber, as in Example 1 and in the same ratios, castings are prepared on a Rapid-Ketten apparatus,

For comparison, a control sample of the material was made, differing from the proposed material in the order of introducing an aluminum salt.

Silica fiberglass is dispersed in a roll while the drum is raised. The pulp is crushed to 90 SR and mixed with the dispersion of fiberglass in the ratio, mass. %:

Cellulose10

Fiberglass90

After the fibers are mixed, aluminum chloride is added to pH k, Q and castings are prepared as in Example 1.

The uniformity of the OTIWBOK is determined visually.

Comparative results of testing samples of paper from fiberglass, obtained by the invention and in the control are given in the table.

Froze The basalt fiber is spread in a roller with a raised drum at water pH k, Q, the pulp is milled in a roll to the degree of grinding and treated with aluminum chloride to achieve a positive Q potential.

Then the basalt fiber is mixed with the cellulose fiber in a ratio as indicated in Example 1 and castings are prepared. The test results are presented in the table.

As can be seen from the table, the treatment of plant fiber with aluminum chloride and the dissolution of glass fiber in the presence of a mineral polybasic acid or its salt, having a monovalent metal cation, contribute to a more durable (by 1550% and uniform web compared to the known method.

The proposed method can be used for the manufacture of filter and heat insulation materials from mineral fibers of different composition.

Claims (3)

1. A method of manufacturing a fibrous material web, including grinding cellulose fiber, pocnycd mineral fiber, formation: reducing cellulose and mineral fibers, introducing an aluminum salt and etching the web onto a paper or card a dividing machine, characterized in that, in order to increase the strength and uniformity of the material, the dissolution of mineral fiber is carried out; in the presence of a mineral polybasic acid or its salt having a monovalent metal cation, and the introduction of an aluminum salt is carried out into a mass of ground pulp fibers, while aluminum chloride is used as an aluminum salt. 2. The method according to p. 1, is no more so that when using cellulose fiber, mainly from hardwood, grind up to 60-98 SR. 3. The method according to claim 1, about tl and h. And so that the dissolution of the mineral fiber is carried out at pH, 0. C, The method according to paragraphs. 1-3, of which it is Mineral fibers use silicate glass fiber or basalt fiber glass. Sources of information taken into account in the examination 1. US Patent No., cl. 1b2-1 5, I960. 2. USSR author's certificate No. 587200, cl. O 21 H 5 / 00.0 21N5 / 1B 1976 (prototype).