SU1252316A1 - Mixture for producing insulating material - Google Patents

Description

The invention relates to construction materials, namely to the production of thermal insulation materials based on mineral wool and mineral binder.

The purpose of the invention is to reduce the average density and thermal conductivity, hygroscopicity and water absorption.

The mixture is prepared as follows. Gypsum, granulated mineral wool and zinc are mixed in a screw mixer for 1 - 1.5 minutes. At the same time, a 50% aqueous solution of latex and a mixture of a 5% aqueous solution of sodium biphosphate and a 25% solution of acetic acid are separately prepared in a container, which is necessary to create B / T-1,1. After that, both solutions are stirred for 0.5-1 min in a paddle mixer. Then, the total solution is added to a screw stirrer with a dry mixture and stirred for 0.5-1 minutes.

The interaction of zinc and acetic acid produces hydrogen, which foams the resulting mass. At the same time, zinc and acetic acid serve as latex stabilizers and prevent gypsum from coagulating when interacting with latex. During the formation of gas bubbles in the liquid phase, the latex serves as a stabilizer of the resulting porous structure by increasing

mix components

gypsum35

mineral fiber 37

Surfactant

VAG-3

THEP

zinc0,5

38

51.8

viscosity and reduce the destruction of the foam while it is mixed with the fibers. The acid residue after its reaction with zinc reduces the time it takes for the gypsum to set, and increases its strength, which leads to the porous mixture setting by the end of the pore formation. The introduction of sodium biphosphate regulates the timing

setting of gypsum and keeps the RP 6 of the medium constant, which is necessary for a given mass.

The use of latex in combination with zinc and biphosphate improves the hydrophobic properties of the proposed composition due to the calcification of capillary pores and cracks in the material, which leads to a decrease in hygroscopicity and water absorption.

sealing the pore walls and increasing the adhesion of gypsum to the fiber, as well as creating a uniform closed porosity, increases the resistance of the material. Samples are made and tested.

proposed and known compositions. The test results are given in the table.

As can be seen from the table, the thermal conductivity of the proposed composition is lower than that of the known 20-25Z, water absorption is lower by 30Z (1.6 - 1.9 times), hygroscopicity is 2 - 3 times lower, water resistance is 10 - 30Z .

2

5.5

35

61.8 3

0.1 0.02 0.08

A7

50.965 1.8 0.15 0.015 0.07

60

39.23 0.5 0.02 0.01 0.06

1.5

Lokaeate m

Proposed

IL ZZn IZlIlirij-I-T

latex

acetic acid3

sodium bisphosphate 0.5

authorities

average density, kg / m 260

coefficient

thermal conductivity, W / h-grad 0.031

flexural strength.

3.5

0.7

220

4 1

230

0.03 0.03

Compiled by N. Kosheleva Editor I. Derbak Tehred M. Margeital Proofreader T. Kolb

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INSIGHTS of the USSR State Committee

. for inventions and discoveries 113035, Moscow, Zh-35, Rauysk nab. 4/5

Production and Printing Enterprise, Uzhgorod, Projecto st., 4

Table continuation

Composition

Famous

350

350

350

0.043

0.043 0.043

Claims (1)

MIXTURE FOR PRODUCTION OF IZO- LATERAL MATERIAL, including mineral wool, as a gypsum and additive binder, characterized in that, in order to reduce heat conductivity, average density, hygroscopicity and water absorption, it additionally contains latex as a binder, and 25% zinc as an additive acetic acid and sodium bisphosphate in the following ratio in May.%: Gypsum Latex Zinc 25% acetic acid Sodium bisphosphate mineral wool components, 35-42 4-6 0.5-1.5 3-4 0.5-1 Rest