SU732429A1 - Method for manufacturing paper-like material - Google Patents

Description

The invention is relative; to the pulp and paper industry. A known method of making paper-like materials, including dissolving pulp in water, introducing a sizing agent and casting the web j. and others. At the same time, the smallest particles of the masses of the mass under the action of electro-kinetic forces are distributed over the surface of the fibers forming the mass, covering part of the surface of the fibers kna. The disadvantage of this method is a reduction in the quality of paper-like materials, for example, based on asbestos or mineral wool, since only a non-critical part of the fiber surface is coated with a sizing filler, and in water, asbestos fibers lose strength. which can improve the quality of the final product, polymers. The aim of the invention is to improve the quality of paper-like materials. This goal is achieved by introducing the sizing agent into the dry mass before dissolving water in a solution in an organic solvent, holding 5-1 O min., And then removing H1 episodes of the solution. The sizing agent is introduced in an amount of 5-35% by weight of absolutely dry fiber. According to the invention, a dry mass of fibers, for example, from asbestos, is mixed with a sizing agent in an amount of 5-35% by weight of absolutely dry mass. For example, a polymer solution (polystyrene, perchlorovinyl, epoxy resin) or; substance in a special solution

732429

Tepe {acetone, Kersuin, dichloroethane). The resulting mass is kept for 5-10 minutes (the extract is necessary for complete impregnation of the fibers with the solution), after which the excess solution is removed, for example, by spinning. The resulting mass is dissolved in water or a solution of water with a surfactant (or other substances determined by the nature of the sizing agent). This prepares the sizing process and proceeds with further manufacturing of the product according to a known manufacturing cycle on standard paper dividing equipment.

For example, the Material is made of dsbestine fibers with perchlorovinyl-based sizing in an amount of 20% by weight of absolutely dry mass B according to the proposed method

four

Insertion and sizing agent in the presence of solvent into permeable anhydrous mass of fibers, perchlorovinyl is kept for 8 minutes until a film of a sizing material is formed on the whole fiber surface, and then excess solution is removed and dispersed in water.

The material made by the proposed method has a high mechanical and electrical strength; cocTaensseT tensile strength 270 kgf / cm and an npoofcBHoe voltage of 15 kV / mm „

The resulting material can be used as an insulator without additional impregnation.

The table gives examples of various materials obtained by the described method,

Kremneorganv- Toluene

Asbestos rubber VN-30 CellulosePolishing Xyu1Ol + 25% acetone sulphite

Nitronpoly-perchlorvinyl xylene tilacrin

Fiberglass, Perchlorvinyl Xylene Parameters no composition changed. AK-15

2O2O18OO

252700

ten

202700

2О-25 2ООО

Claims (1)

10 10201900 573 The proposed sizing procedure to obtain the fibers, completely covered with a sizing film, substances on the entire surface. This film retains the ability to stick together with itself similar to another fiber during sheet formation due to the presence of a solvent, or due to thermal scars (in the case of using thermoplastic fillers), which increases me; The strength of the material, and hence its quality. Fiber-coated fibers do not allow the suspension of a mass of fibers in water (like paper pulp) or in a solution of water with a surface-active substance or special additives (for example, acids), while forming a shhenka prevents the fibers from moisture, which also improves the quality of the final product. 9 6 The claims of the invention 1. A method of manufacturing a paper-like material mainly from properties including the dissolution of fibrous material. the masses in water, the introduction of a sizing agent, and a fabric cast, characterized in that, in order to improve the quality of the material, the sizing agent is introduced into the dry mass before dissolution in the form of a solution e of an organic solvent, then held for 5-10 minutes, and then removed 2, Method according to claim 1, characterized in that the sizing agent is introduced in an amount of 5-35% by weight of absolutely dry fiber. Sources of information taken into account during the examination 1. G. Lehman. Fundamentals of paper processing technology for cardboard, M, 1968, p. 95s 106, 107, 129 (prototype).