RU1781263C - Composition for finishing work - Google Patents

Abstract

Usage: for sealing cracks, cracks, recesses on wooden, concrete and plastered surfaces, for gluing ceramic tiles for molding and molding products. Summary of the invention: composition for finishing works contains polyacrylamide 2 - 4%, chalk 20 - 30%, wood or cotton pulp 8 - 13, zinc oxide 2-3, water the rest. The viability of the composition is 24 hours, adhesion is 0.53 - 0.63 MPa, impact strength is 5.0-6, OMP. 2 tab.

Description

The invention relates to building materials, namely, finishing materials for sealing cracks, cracks, indentations on wooden, concrete and plastered surfaces, for gluing ceramic tiles to these surfaces, for repairing wooden products, products from particle board and fiberboard, for molding and molding of various products, crafts, three-dimensional images when decorating exhibition stands, decorating and decorating interiors in rooms, when repairing wooden furniture, etc.

Known filling material of the following composition, wt.%:

Polyacrylamide 0.3-1.5

Ground Chalk 55.0 - 74.0

Carboxymethyl cellulose 0 4 - 1,0

Industrial oil0.7 - 1.0 WaterOther The known material is a paste-like mass of white color. Used as a putty for wood and plaster surfaces, it has increased fragility, low

physical and mechanical properties and low water resistance. In addition to these shortcomings, it is low-tech, because sticks to the surface of the equipment, it is not behind the spatula when applied to the surface.

The closest in technical essence to the proposed material is the composition of the porous filler for wood (2), containing, wt.%:

Polyacrylamide 1.2-2.5

Chalk 20.0 - 50.0

Water Else

The known composition lacks ductility and shape-forming properties, it sticks to the hands and has low strength. It cannot be used for stucco work.

The purpose of the invention is to increase the ductility and shaping ability, to remove adhesion to the hands and to increase the shelf life.

This goal is achieved due to the fact that the composition for finishing work, including polyacrylamide, chalk and water additionally contains wood or cotton cellulose and zinc oxide in the following ratio, wt.%

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2-4 20-30 8- 13 2-3 Else

In this case, wood or cotton cellulose, as well as mixtures thereof, can be used as cellulose. Wood pulp can be a product manufactured according to GOST 5143-65 (in the form of flagella), according to GOST 13891-68 (in the form of a web). Cotton cellulose may be a product manufactured according to GOST 595-79. Any other type of wood and cotton pulp is suitable for use while ensuring uniformity of the resulting composition.

Wastes from various industries associated with the use of cellulose can also be used in the proposed material, for example, at the stage of its loosening (in balers), cutting, followed by transport by pneumatic transport and collection in special chambers or bag filters.

The fiber sizes of the cellulose used can vary within wide limits: the fiber length can be from 0.05 mm to 15 mm, the fiber diameter is from 10 to 35 microns. The sizes of the original cellulose fibers are not significant, because during the preparation of the material, they are ground to the required dimensions, ensuring uniformity of the composition as a whole.

The optimal sizes of cellulose in the finished material are: fiber length 0.05 - 5.0 mm, thickness 10-35 microns.

As a binder, it contains polyacrylamide (PAA), which is an odorless white powder, readily soluble in water and insoluble in alcohol, ethers and other organic solvents, PAA is non-toxic and is used in industry for the treatment of industrial and drinking water. for sizing yarn before weaving and is commercially available in the form of a 6-8% aqueous solution (gel) according to TU 6-01-1049-81.

As a filler, the material contains chalk produced, for example, according to GOST 12085-75.

Zinc oxide (or zinc white) is introduced to eliminate the separation of the composition and the release on its surface of various substances that are soluble in PAA and enter it during production and transportation, with the formation of multi-colored spots that give the composition a non-marketable appearance. As a result of the addition of zinc oxide

the product retains white color for a long shelf life (more than 24 months). Without the addition of zinc oxide, they appear on the surface of the material.

multi-colored spots after 15-20 days of storage. Zinc oxide is a compound of zinc with oxygen in the form of white hexagonal crystals. Available in accordance with GOST 10262-73. Zinc oxide can be replaced with zinc whitewash, which is a white powder product produced according to GOST 202-84.

It should be noted that the occurrence

new useful properties - plasticity, ability to form and lack of adhesion to hands, are accompanied by an improvement in other characteristics, such as strength, shrinkage, etc.

The proposed material, like good clay, has good ductility and shape-forming ability, non-stick to the hands, high strength and lightness at the level of wood, with

Moreover, it still does not have good elasticity, long viability, low shrinkage, good adhesive properties and sufficient water resistance.

The material is technological in the manufacture and use. It does not delaminate and retains its presentation for a long time.

The proposed material is manufactured

by simple technology. The whole process is carried out in a mixer equipped with α-shaped mixers (type СМ-400, СМ-800). Before feeding the pulp, it is preliminarily prepared as follows.

way. Cellulose coming in the form of flagella in bales is loosened in bale feeders, and cellulose coming in the form of a web roll is cut on machines, for example, in an SRCC (cellulose cutting machine) into 3x4 mm diamonds. Cellulose with a fiber length of 0.05-1.0 mm goes into production without prior loosening and grinding. Water is poured into the mixer and during continuous operation of the mixers all the pulp is gradually (in portions) loaded, after which it is wet-milled in the mixer | during continuous operation of the mixers for 30 - 90 min (depending on length

original cellulose fibers). In the process of wet milling, grinding occurs, as well as the breaking of cellulose into fibers, followed by the destruction and grinding of its long fibers into shorter ones (2-4 times). The mixer was then filled with re-shaped polyacrylamide, followed by stirring for 30 minutes. Chalk and zinc oxide are charged into the resulting mixture and mixed until a uniform white plastic mass is obtained.

The material is non-toxic, as consists of non-toxic components. Examples of carrying out the invention at various ratios of components and their physico-chemical characteristics are given in Tables 1 and 2.

The proposed material can be used in the manufacture of toys and bas-reliefs in the following ways: by the method of forming (stuffing) concave shapes; a method of molding on convex blanks; by way of manual molding without molds.

The proposed material was used in the restoration of museum wooden exhibits. During the restoration of museum exhibits, their repair was carried out without loss of the original (clipping) in the places where mechanical damage was repaired. Exhibit repair consists of the following operations: filling hollows, chips, gaps in the product and adding the missing parts, followed by drying at room temperature, grinding, polishing, cutting the required patterns. After that, the surface is impregnated with drying oil or other reinforcing composition, tinted and painted with appropriate paints.

Due to its properties, the proposed material can find the widest application in a variety of construction works, for example, in the restoration of damaged surfaces, in the correction of defects in products made of wood-particle and fiberboard; during decoration and repair of various construction objects and premises; in the decoration and repair of furniture, restoration of museum exhibits; at registration of interiors; when sealing cavities, cracks, cracks on concrete, plaster and wood surfaces: for gluing ceramic tiles to said surfaces; in the manufacture of all kinds of stucco products, crafts and toys; for children's creativity.

Claims (1)

SUMMARY OF THE INVENTION Finishing composition comprising polyacrylamide. chalk and water, characterized in that, in order to increase plasticity and shape-forming ability, eliminate stickiness to the hands and increase the shelf life, it additionally contains wood or cotton cellulose and zinc oxide in the following ratio of components, wt.%: Polyacrylamide 2-4 Mel20 - 30 Wood or cotton pulp 8-13 Zinc oxide 2-3 Water Rest The content of components, wt.% In the composition 1 2 | 3 | 5 | 6 7 8 S 10 | 11 12 13 (I t5 12 12 12 thirteen T a b l q q 1 10 10 5.5 5.5 eleven 10 10 o no good chew Fragile 5.0 6.0 5.0 4.0 4.0 5.5 (.O 5.0 6.0 5.0 - 2.6 3.5 4.5 3.5 3.5 3.0 4.0 3.0 3.2 4.0 2.5, 3 1.5 t, 5 1.8 1.5 1.5 1.7 1.3 1.6 1.2 24 h 24 24 24 24 24 24 24 24 24 24 0.35 0.53 0.53 0.62 0.60 0.43 0.59 0.63 0.50 0.55 0.53 Sticks tightly Cream Do not stick White Do not stick White Table 2 5.0 5.0 5.0 5.0 5.0 4.2 1.2 24 0.60 4.44.3 1.31.2 2424 0,530,54 4.0 1.5 24 0.60 Do not stick White White