SU730642A1 - Raw mixture for producing building material - Google Patents

Description

one

The invention relates to building materials intended for the manufacture of tunnels for partitions.

Known composition 1, containing semi-aquatic gypsum, carbamide resin, technical lignin and water at a ratio of components, wt.%:

Semi-aquatic gypsum33-37

Urea resin 18.5-31.5

Technical lignin 15 - 18,5

WaterEverything

The disadvantage of this composition is the low water resistance of the products.

The closest to the technical essence and the achieved effect is the raw material mixture 12) to obtain a building material, including components, wt.%: Pop gypsum pop, for example phosphogyte 77-94

Mineralized sawdust5-20

Urea resin1-3

The disadvantage of this composition is the low strength and water resistance of the products.

The purpose of the invention is to increase the strength and water resistance of products.

The goal is achieved by the fact that the raw material mixture for the production of building material, including gypsum, vegetable waste, carniferous resin and water containing campfire as vegetable waste and additionally polyvinyl acetate or acrylic emulsion, phosphate bond and sulfite alcohol bard the ratio of the components, wt.%:

Gypsum 49 - 53

Kastra3-20

Urea resin 03 - 7.7

15

Watering Inilace Tatna

or acrylic emulsion 0.08 -2.72 Phosphate bond 0.1 - 0.7

Sulfite-alcohol bard0,1 - 03

20

WaterEverything

Claims (3)

An increase in the strength and water resistance of products is achieved by introducing into the composition of the mass of polyvinyl acetate irides of acrylic 7 an emulsion, a phosphate bond, a sulfite from a pirate bard, and also fires playing the role of a reinforcing material. When mixing gypsum shut with water with a polyvinyl acetate or acrylic emulsion, the latter are highly stretchable, help reduce brittleness, reduce the dry ratio and increase the density of the solutions, resulting in improved strength and water resistance. The introduction of an emulsion below 0.08% is insufficient for obtaining appropriate properties, and an increase in the emulsion content above 2.72% leads to an increase in the cost of mass. The introduction of sulfite-alcohol stillage contributes to an increase in density and an improvement in the structure of the mass due to the plasticizing effect and a decrease in the water-gypsum ratio. In addition, sulphite-alcohol bard is adsorbed by particles of semi-aquatic two-water gypsum and reduces the rate of crystallization of embryos, which slows down the time it takes for the gypsum to set. The urea resin, which possesses terrific properties, fills the micropores of the gypsum products and goes into an insoluble and infusible state during heat treatment, thereby providing a more dense structure of polymer-gypsum products, as a result of which the strength and water resistance of products are significantly increased. With the introduction of urea resin less than 03% decreases the strength and water resistance of the products. An increase in the content of carbamide resin above 7.7% is not economically feasible. The introduction of a phosphate binder promotes the creation of an acidic environment and the curing of the resin and emulsions. An increase in the phosphate bond content in excess of 0.7% leads to an increase in the hygroscopicity of the products. The introduction of a phosphate bond of less than 0.1% is not sufficient to cure the resin. The introduction of fires below 3% is inexpedient, since in this case the reinforcing role of this material is significantly reduced. An increase in the consumption of fires above 20% by weight reduces the density and water resistance of the products, as this significantly reduces their density. Example 1. To 53% gypsum, 16% bonfires are added and mixed well, then in a separate Tqje, 03% carbamide resin, 0.08% polyvinyl acetate emulsion is mixed. 0.1% sulfite-alcohol stillage, 30.42% of water is poured into a mixture of gypsum and fires. In the last turn, 0.1% phosphate binder is added. After thoroughly moving, the entire mixture is poured into a mold and vibrated for 4–1 minutes. Then the product is dried in the form at 50 ° C for 15 minutes. After that, the product is unpacked and dried at 70 ° C for 24 hours. Example 2. K51% gypsum is added 11% sharp and thoroughly mixed, then 4.4% urea moles, 1.5% acrylic emulsion, 0.2% sulfite-alcohol stillage, 31.5% water are mixed in the container and the mixture is poured gypsum and fires. At least 0.4% phosphate binder is added. After thorough mixing, the entire mixture is poured into a mold and vibrated for 1 minute. The product is dried in the form at 50 ° C for 15 minutes. After which the production and removal of the product at 24 hours is carried out. Example 3. To 49% gypsum, 7% fires are added and mixed thoroughly, then 7.7% carbamide resin, 2.7% acrylic emulsion, 03% sulfite-alcohol stillage, 32.58% water are mixed in a separate container and poured into the mixture gypsum and fires. At least 0.7% phosphate binder is added. After thorough mixing, the whole mixture is poured into a mold and vibrated for 1 minute. The product is dried in the form at 50 ° C for 15 minutes. After that, the product is dismantled at 70 ° C for 1 minute. The physicomechanical properties of products made from mixtures of known and proposed compositions are presented in the table. Volume weight. 1300 1300 1300 Limit 1PHEADNESS, kg / cm when compressed 36 31 Formula of the invention as a waste of vegetable origin, a bonfire and, additionally, a polyvinyl acetate or acrylic emulsion, a phosphate bond, and a sulfite-alcohol 5 bard in the following ratio of composites. wt.%: Gypsum Co3 Carbamide resin 03 Polyvinyl acetate or acrylic emulsion 0.08 Phosphate bond 0.17306426 en-Sulphite-alcohol bard 0, 1 - OL3 Water Else USSR Author's Certificate No. 543636, cl. From 04 To 11/14, 1975. 2.72 | 2- USSR Author's Certificate No. 489731, 0.7kl. C 04 V 11/04, 1975 (prototype).