SU966077A1 - Raw mix for producing hydrophobization coating - Google Patents

Description

The invention relates to the field of building materials, and to compositions for the hydrophobization of porous foam glass fillers.

Known hydrophobization perlite sand methyltrichlorosilane

However, the disadvantages of the known composition include the phenomenon of a decrease in the water repellency effect of organosilicon ones. resins over time due to the occurrence of destructive processes. This is especially the case with frequent alternate moistening and drying of the material.

Closest to the proposed technical essence and the achieved effect is a raw material for the manufacture of a hydroforbing coating, preferably for foam glass filler, including G polystyrene or copolymer styrene 2.

A disadvantage of the known is the low hydrophobic properties of the processing of aggregates.

The aim of the invention is to increase the hydrophobic properties of the aggregate.

The goal is achieved by the fact that the raw mix for obtaining a hydrophobic coating, mainly for a glass substitute, including a styrene-containing component, additionally contains benzoyl peroxide, expanding cement and xylene, and as a styrene-containing component - polystyrene and styrene in the following ratio of components .%:

ten

Polystyrene 8.0-12.0 Styrene16.0-24.0

Benzoyl peroxide 0.018-0.022 Expandable

cement15.0-25.0

15

Xylene

The use of polystyrene, styrene, and benzoyl peroxide as a polymeric binder of a water-repellent composition is dictated by their high resistance to water, as well as by the possibility of dosing the viscosity of the composition.

SPOLYstyrene, dissolved1} in xylene, is a viscosity regulator

25 systems. With an increase in its content, the viscosity of the system increases, and with a decrease it decreases sharply. This circumstance makes it possible to control the degree of penetration of the composition into the open pores of the filler. Styrene and Senzoyl peroxide after polymerization, turning into polystyrene, contribute to even greater polymerization. Asshir knh iyce cement reduces the polymerization of the composition and contributes to an increase in hydrophobic properties, so that water, penetrating into the pores of the aggregate, interacts with the expanding cement with an increase in its volume, it leads to the closure of pores. Xylene serves as a solvent of polystyrene and contributes to the uniform distribution of the components of the raw material mixture of S volume during the preparation stage. Pretreatment of the specified raw material mixture of aggregates, mainly foam glass, allows closing open pores without a significant decrease in total porosity. This eliminates one of the main causes of high water absorption and low frost resistance of thermal and hydraulic insulation. Example. Shredded polystyrene and xylene are loaded into a Z-forked mixer and mixed until dissolved. Then styrene and benzoyl peroxide are added and stirring is continued for 5 minutes. After this, parts with the mixer in operation Load the expanding cement and mix until a homogeneous mass is obtained. "Thus prepared, the raw mixture is suitable for hydrophobizing a porous foam glass filler having the following characteristics: Bulk density, kg / m Granule size, mm Heat conductivity coefficient, 0, Porous aggregate from foam glass is treated with the specified composition in a ratio of 10: 2 (porous aggregate - raw mix for a waterproofing coating) in a mixer c. for 15 minutes Compositions for the preparation of a hydrophobic coating for foam glass aggregates are given in Table. 1. T and l and c and 1

Physicomechanical properties, filler. Processed 60-80

260-270

my and known compositions are given; tab. 2

table 2

70-80

80-90

80-90

270-280

290-300 260-270

Less than 1

Less than 1 Same

3-4

: Frost resistance, cycles

Heat conductivity coefficient, W / m

. As follows from the data in the table, the proposed raw material mixture for obtaining a hydrophobic acid coating has better water absorption and frost resistance than is known, and can be used in the preparation of three-dimensional thermal-hydro-insulation coatings for hydrotechnical and irrigation structures, as well as underground utilities, equally in the zone of alternating temperatures and alternate moistening and drying ..

Claims (2)

Invention Formula The raw material mixture for obtaining a hydrophobicidal coating, mainly for the foam glass filler, includes the styrene-containing component. Continuation of the table. 2 More than 200 -175 175 , 08  I nent different from that, for the purpose of aovysheny hydrophobic. properties of the aggregate, it additionally contains benzoyl peroxide, expanding cement and xylene, and as a styrene-containing component, polystyrene and styrene in the following ratio, wt.%: ; Polystyrene 8.0-12.0 5 Styrene 16.0-24.0 Peroxide benzoyl 0.018-0.022 Expanding 15.0-25.0 cement Xylene Else 0 Sources of information taken into account in the examination: 1 “USSR author's certificate 418459, cl. From 04 To 43/00, 1972. 2. Patent of France 1 2050999, 5 cl. from 04 B-31/00, 1971.