RU2032640C1 - Polymeric mineral composition - Google Patents

Abstract

FIELD: production of building materials. SUBSTANCE: the composition comprises (wt % ): 15-3- resol type phenol formaldehyde resin; 0.2- 1.0 aqueous ammonia solution; 10-30 Portland cement 40-60 filler, and water, the balance. The resulting polymeric concrete has a compression strength of 70.2 MPa and a bending strength of 12.1 MPa. EFFECT: improved properties of the building materials. 2 tbl

Description

 The invention relates to the building materials industry and can be used in the manufacture of building structures that work on bending and compression, for example, flooring and floor slabs, beams and crossbars, enclosing structures.

 Known composition for the manufacture of building products, including, by weight.h.

Phenol formaldehyde resin 100 Porophor 1.5 Urotropin 10 Expanded perlite 45 (1)
The closest in technical essence is a polymer concrete mixture, including, by weight.

Ketone Formal
ACF-3 type dehydrous resin 0.3-10.0
Mineral binder 15-50 Hardener (NaOH) 0.1-1.0 Aggregate Other
Water is introduced to the desired consistency (2).

 A disadvantage of the known material is relatively low strength.

 The aim of the invention is to increase the compressive strength and bending.

 This is achieved by the fact that the polymer-mineral composition, including a formaldehyde-containing resin, an alkaline hardener, Portland cement, aggregate and water, contains a phenol-formaldehyde resin of the rezol type, 25% aqueous ammonia solution in the following ratio of components, wt.

Phenol formal
resole type 15-30 dehydrate resin
25% aqueous ammonia solution 0.2-1.0
Mineral astringent 10-30 Aggregate 40-60 Water Else
To prepare the polymer-mineral composition, phenol-formaldehyde resins are used.

A method of preparing a polymer-mineral composition and products from it is as follows. Pre-mixed mineral binder (Portland cement) with aggregate, after which mixing water mixed with phenol-formaldehyde resin and amine hardener 25% aqueous ammonia is added to the resulting mixture. The resulting mixture was stirred for 3.5 min, filled into forms and cured at a gradually increasing temperature:. 80 ° ^C 6.8 h, 100 ^{° C} 1,5.2,0 h 140 h ^C. 1,5.2,0 This duration depends on the curing cross-sectional dimensions of the product.

 The curing process of the composition occurs as a result of the polycondensation reaction of the resin and hydration of the mineral binder. Along with the hydration reaction during mixing of the mineral binder with water, its reaction also occurs with the free hydroxyl groups of the resin, which promotes the formation of bonds between the mineral binder and phenol-formaldehyde resin. In addition, the hydroxyl groups of the resin form coordination bonds with metal oxides (calcium, aluminum, etc.) included in mineral aggregates.

 Physico-mechanical characteristics largely depend on the efficiency of water binding in the system with mineral binders and minimizing unbound water.

 Hydration-coordination processes and polycondensation of the resin along the methanol groups proceed with the formation of a spatial structure and the release of free water, the excess of which is displaced during curing, while the composition self-densifies, which also affects the increase in the strength characteristics of products and eliminates the need for vibration.

Exposure of the composition at 80 ° ^C removes the displaced water, mostly located on the surface (in this case there is no swelling of the composition), and then at ¹⁰⁰ ° C removes moisture located in capillaries.

 The achievement of a positive effect when using a polymer-mineral composition is illustrated by examples and confirmed experimentally.

 Examples are presented in table 1.

 For each of the examples presented in the table, batches are prepared and filled with them the shapes of prism samples 40x40x160 mm in size (for bending strength tests) and cubes of 100x100x100 mm in size (for compressive strength tests).

To determine the properties of the composition, mixtures of 1: 3 composition (cement: aggregate) were prepared on cement grade M 400. Portland cement, aggregates, an aqueous solution of phenol-formaldehyde resin SFZh-305, with a 25% ammonia solution previously introduced into it, were mixed in a mixer for 3.5 minutes The mixed mass fits well into any configuration. After 30.60 min exposure in vivo forms were placed into the oven and kept at gradually increasing temperature: 80 ° ^C 6.8 hours 100 ^{° C} 1,5.2,0 h, 140 ^{° C} 1,5.2,0 hours.

 Studies have been conducted to study the strength characteristics of the cured composition, depending on the quantitative composition of its constituent components.

 Physico-mechanical properties of the samples are given in table.2.

Claims (1)

 POLYMERMINERAL COMPOSITION, including formaldehyde-containing resin, alkaline hardener, Portland cement, aggregate and water, characterized in that, in order to increase compressive and bending strength, it contains phenol-formaldehyde resin of the rezol type as an alkaline hardener 85% as an alkaline hardener ammonia solution in the following ratio of components, wt. Resol-type phenol-formaldehyde resin 15 30
25% Aqueous ammonia 0.2 0.2
Portland cement 10 30
Placeholder 40 60
Water Else

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