SU948980A1 - Method for making polymer concrete products - Google Patents

Description

one

The invention relates to methods for the manufacture of concrete-polymer products and can be used in the manufacture of cladding products for decorative finishing and chemical protection of buildings for various purposes,

A known method for the manufacture of concrete-polymer products, including drying, evacuating and impregnating concrete and reinforced concrete products with a manomer, followed by thermocatalytic polymerization in the thickness of concrete Cl.

This method has disadvantages due to the volatility of the monomer and the associated need to take special measures to prevent the loss of monomer to evaporation, to ensure fire and explosion safety, as well as to anti-toxic protection of production.

There is also known a method for the manufacture of concrete-polymer products by impregnating gas-silicate concrete with a-one or a mixture of oligoester 5 acrylates — trioxyethylene-o1, 1 and dimethacrylate of type TGM-3, o1, 1Abmethacryl (bistriethylene glycol) phthalate and a-and-a, and I-a. 1,3) (bis-glycerol) -2-ft. lat type MGF-9, followed by polymerization in the presence of a peroxide initiator {.21.

However, as experience shows, during heat treatment from dense concrete in size in terms of mm, fed with TGM-3, due to partial evaporation of the oligoester acrylate during polymerization, areas are formed on the surface where the polymer component is absent. It reduces the strength

20 and durability and degrades the appearance of the product. If concrete is more dense than gas syrup, viscous oligoether acrylate type MGF-9 or a mixture of TGM-3 and MGF-9 | then the impregnation process is slowed down so that it is practically unsuitable for production. Thus, it has been established experimentally that even after daily keeping in the impregnating medium the thickness of the impregnated layer does not exceed 1 mm, which is completely inadequate for anticorrosion protection or decorative finishing. The closest to the present invention is a method for manufacturing concrete-polymer products by successive impregnation with low-viscosity and high-viscosity impregnating compositions followed by polymerization at elevated temperature or gamma irradiation with Cs;}. The known method is busy, while the impregnation with a low viscosity impregnating composition-monomer of the vinyl series, the concrete product is subjected to multiple vacuuming at a vacuum of 10. mm Hg. and impregnation at a pressure of 2-3 MPa for an hour with subsequent air blowing with temperature. During the impregnation of the high impregnation composition with petrolatum heated to 85-95 ° C, the product is kept for 2-3 hours. At a higher temperature, monomer polymerization occurs simultaneously with petrolatum penetration into the surface layer of the product. The known method is difficult to implement, has increased energy consumption. The purpose of the invention is to intensify and simplify the impregnation process. This goal is achieved by the fact that according to the method of manufacturing concrete-polymer products by successively impregnating them with low-viscous highly viscous impregnating compositions followed by polymerization at elevated temperature or gamma irradiation, the impregnation is carried out with trioxyethylene-1, 1-dimethacrylate and c (., And-methacryl (bis-triethylene glycol) phthalate, the ratio of the time of impregnation with a low-viscosity composition to the time of impregnation with a high-viscosity composition is in the range (2: 1) - (20: 1). According to the method of manufacturing the running of thin-polymer and The products are polymerization-capable, followed by polymerization, impregnation — Polymerization-capable intervening with 4,040 immiscible oligoether acrylates is carried out in order to increase their viscosity, i.e., they are impregnated with low-density oligoether acrylate — trioxyethylene-dihydrate, or at the age of 22 9.5 cP, followed by high viscosity oligoether acrylate, c., And -methacryl (bis-triethylene glycol) phthalate of the type MGF-9 with a viscosity of 178-180 cP. The proposed method is carried out as follows. After having formed the formwork strength and dried, the molded articles are first impregnated with low viscosity oligoether acrylate, for example, TGI-3. for -10 h, and then more viscous, such as MGF-9. within 0 hours. After this, a polymerization treatment was carried out using a radiation or thermal method, in the latter case, polymerization initiators, such as methyl ethyl ketone peroxide, are introduced into the oligoester acrylates. When impregnated, a low viscosity oligoether acrylate not only penetrates intensively into the concrete mass, but also contributes to the subsequent penetration of viscous oligoetheacrylate, and the impregnation process is most intensified. The viscous oligoester acrylate, in turn, not only does not evaporate itself, but also prevents evaporation of the less viscous oligoester acrylate, which is associated with it due to its mutual dissolution. This ensures increased strength and durability of the concrete polymer and improves the appearance of the products. An example. Molded concrete slabs of mm size. The bottom layer with a thickness of 20 mm is formed from cement-sandstone concrete M200. An upper textured layer 15 mm thick is prepared from a mixture of the following composition, white cement 500, marble crumb 1250, chromium oxide 50. The products are subjected to heat treatment, dried, and then placed for 6 hours in a container with TGM-3 (relative viscosity 9 cP ), and then kept in the c-MGF-9 tank (relative viscosity 178 cP) for 2 hours. After impregnation, the plates are treated with y-rays with an integral dose of 3 megaarad .. After the finishing-treatment, the plates are ground and polished. Plate strength

for bending after such treatment is 28. MPa, the color of the front surface is dark green, texture-polished, gloss by FB-2 gloss meter 30-33 units, frost resistance - more than 500 cycles. For plates not treated with polymer, the strength is 6.5 MPa, the surface is not polishable.

The kinetics of cement-sand concrete impregnation with TGM-3 MGF-9 oligo ether acrylates, 1: 1 mixture of TGM-3 and MGF-9, as well as the kinetics of concrete impregnation with MGF-9 composition after preliminary impregnation of TGM-3 are presented in Table. one..

Table 1

The results of testing samples made by the proposed and known 31 methods are presented in Table. 2 ..

table 2

Strength on,

compression, MPa 100.0-120.080.0-100

Durability at "lp

bending, MPa 28,0-30,010,0-12,0

Water absorption,% Less than 0,050,1-0,2

Claims (2)

Claim 1. A method of manufacturing concrete polymer products by sequentially impregnating them with low-viscosity and high-viscosity impregnating compositions, followed by polymerization at elevated temperature or gamma radiation, characterized in that, in order to intensify and simplify the impregnation process, the latter is carried out with triethylene-cl, <p-dimethacryl + ohm and ci d? -methacryl (bistriethylene glycol) phthalate. 2. The method of pop. 1, characterized in that the ratio of the time of impregnation with a low viscosity composition to the time of impregnation with a high viscosity composition is (2: 1) - (20: 1).