SU1475899A1 - Initial composition for manufacturing heat-insulating material - Google Patents

Abstract

The invention relates to the manufacture of a thermal insulation material based on mineral fiber and an organic binder. In order to improve accuracy and water resistance, the raw mix for the production of thermal insulation material contains: wt.%: Basalt fiber 20.0-28.7

polyvinyl acetate dispersion 10.8-12.0

aqueous solution of H ₂ SO ₄ concentration 1.0-2.0% 11.8-16.0

cement dust 3.3-7.0

calcium stearate 0.1-0.3

water 36.0-54.0. Thermal insulation material from this composition is prepared by mixing the starting components, including preparing a solution of polyvinyl acetate dispersion diluted with water and introducing into it cement dust treated with calcium stearate, and adding the resulting solution to basalt fiber previously moistened with an aqueous solution of H ₂ SO ₄ followed by molding and two-stage heat treatment: drying to remove water at 120-150 ° C for 3.5-4 hours in the first stage and holding at 170-190 ° C for 3-4 hours in the second stage. With a bulk density of 120–130 kg / m ^{3, the} products have a flexural strength of 4.1–4.2 MPa, a thermal conductivity coefficient of 0.06–0.065 W / μ, water resistance 1. Table 2.

Description

The pressing of products is carried out by filtering the hydromass while blowing compressed air through the upper punch at a specific pressure of 5-10 kgf / cm2. Thereafter, the hydromass is dried at 120-150 ° C for 3-4 hours until water is removed, then the heat treatment is carried out at 170-190 ° C for 3-4 hours.

Examples of specific compositions of the raw mix and method of manufacturing products from it are given in Table. 1. The properties of the material obtained are presented in table. 2

Characteristics of the starting components: basalt fiber is a fibrous material obtained from natural stone materials TU 611215-76; polyvinyl acetate - on the PCT dispersion; Arm.SSR 880-77 GOST 667-53; calcium stearate GOST 6484-64; cement dust.

In the process of burning cement clinker in rotary kilns, a significant part of the kiln material in the form of cement dust is carried out of the kilns along with flue gases. As a rule, the carbonate component is to a greater extent carried away, and the clayey and ferruginous components to a lesser extent. A distinctive feature of cement dust is an increased alkali content in comparison with the raw material mixture.

The captured cement dust has a chemical composition given in Table. 3

Cement dust is a cheap and affordable component — production waste.

Cement dust is pre-mixed with calcium stearate, which temporarily, prior to heat treatment, reduces the activity of the alkaline components of cement dust and ensures the combination of components and the homogeneity of the composition, and this improves the physical and mechanical properties of the products.

Formulas

the invention

5 Q

0

Raw mix for the manufacture of insulating material, comprising 20-28.7 wt.% Basalt fiber, 10.8-12 wt.% Polyvinyl acetate dispersion, 11.8-16 wt.% Aqueous solution concentration of 1-2%, 36 -54% by weight of water and a silica-containing filler, characterized in that, in order to increase strength and water resistance, it contains cement dust treated with calcium stearate as a silica-containing component, and the content of cement dust and calcium stearate is 3.3 respectively -7 and 0.1-0.3 wt.%.

Table 1

Opponents, wt.%

Basalt

fiber 20,0

Polyvinyl acetate

dispersion 10.8

Aqueous solution H 7.804

at a concentration of 1.02, 0%

Cement dust sample 1 sample 2

Calcium Stearate

Water technology parameters

Concentration

wt.% 1,0

Drying temperature, 120 ° C

Drying time, h 4

28.7 24.0 23.0 12.0 12.0 11.5

2.0 1.5 1.5 150 130 130 3.5 3.5 3.5

Temperature of additional heat treatment, ° С

Time additional heat treatment, h

Continuation of table 1

190170180-180

3,543,5 3,5

table 2

Claims (1)

Claim The raw material mixture for the manufacture of heat-insulating material, including 20-28.7 wt.% Basalt fiber, 10.8-12 wt.% Polyvinyl acetate dispersion, 11.8-16 wt.% Aqueous solution H ^ S0 4 concentration of 12%, 36- 54 wt.% Water and a silica-containing filler, and the fact that, in order to increase strength and water resistance, it contains cement dust treated with calcium stearate as a silica-containing component, and the content of cement dust and stearate calcium is respectively 3.3-7 and 0.1-0.3 may. 7 ". Table 1 Raw Material Components Formulation Examples G Ί physical parameters 1 I ^{2 3} I . 4 Components, wt.% Basalt FIBER 20,0 28.7 24.0 23.0 Polyvinyl acetate dispersion 10.8 12.0 12.0 11.5 H2SO4 aqueous solution at a concentration of 1.0- 2.0% 1 1, 8 16.0 12.5 15,5 Cement dust sample 1 3.3 - s, s - sample 2 - 7.0 - 3.8 Calcium stearate 0.1 0.3 0.2 0.2 Water 54.0 36.0 48.0 46.0 Technological parameters Concentration H ^ SO. ,, May. % 1,0 2.0 '1,5 1,5 Temperature drying, ° C 120 150 130 ' 130 Drying time h 4 . 3,5 3,5 3,5 Examples of compositions ________, _______________________ TSRODLOG-TabLd ^ Raw Mix Components and Process Parameters Additional heat treatment temperature, ° C 190 170 180 - 180 Additional heat treatment time, h 3.5 4 3.5 3.5 1 T a b l g [p a 2 Compositions Volumetric Limit Coefficient Time Waterproof weight, other ent tep drying bone: kg / m ³ nosti pipeline - and ter strength at nosti moob- after you bending MPa W / mK work hours holding boiling. water 6 hours MPa Famous ny 110-120 2.8-3.0 0.06-0.65 7-7.5 2.4-3.0 Proposed 1 120 4.1 0,060 '7.5 4.1 2 130. 4.4 0,065 7.5 4.3 3 125 4.2 0,060 7.0 4.2 4 125 4.2 - 0,060 7.0 4.2 Table 3 Samples Content, wt.% Ignition Volatile Products SiO ₂ Al Fe ^ oj Cao MgO Na ₂ 0 K ₇ 0 TiO-i 1 14.2 4.1 s, s 43.6 1,5 2.1 2.0 0, .6 28.7 2 15.11 4.00 3.21 42.8 1.55 2.0 1.99 0.55 27.9