Binder

 

The invention relates to binders based navrachna phenol-formaldehyde oligomer (NFFO) to obtain a press-powders designed for operation in conditions of high loads. Binder contains, %: NFO 60,5-76,5, hexamethylenetetramine 4,5-8,5, complex vanadium 15,0-35,0. The complex vanadium is a product of the interaction of metavanadate sodium and biomineralization oligomer obtained by extracting vanadium from waste process solutions of slag processing of ferrous metallurgy. The invention improves the original mechanical crushing strength and the strength after thermal loading 300oC for 30 minutes table 2.

The invention relates to the production of phenol-formaldehyde Novolac binder type, which can be used for a wide range of products, in particular those operating under high loads.

Known binder for the manufacture of abrasive tools containing Novolac phenol-formaldehyde oligomer and curing agent is hexamethylenetetramine, on 100 wt.h. oligomer add 6-10 wt.h. hexamethylenetetramine (USSR author's certificate 531829, CL is the crushing and insufficient heat resistance, leading to a decrease in strength due to thermal loading at 300oC.

The closest in technical essence and the achieved effect is a binder (patent RF 2010818, CL 08 L 61/10. Bull. 7 from 15.04.94) containing powdered phenol-formaldehyde Novolac oligomer (NFFO), the curing agent is hexamethylenetetramine (it has been) and modifier, which is used as a waste recovery silicon dioxide, in the following ratio of components (wt.h) wt.%: Novolac phenol-formaldehyde oligomer - (100) 79,9-87,7 Hexamethylenetetramine - (6-12) Of 5.2-9.8 Waste recovery silicon dioxide - (5-15) 4,4-12,1 Lack middleware prototype is relatively low mechanical strength, which limits the possibility of creating press materials, operating under high loads.

The technical result of the invention is to increase the strength of the binder, which is achieved by the fact that the binder containing Novolac phenol-formaldehyde oligomer, hexamethylenetetramine and modifier, as the latter contains a complex of vanadium, represents a product of the interaction of metavanadate sodium and biomineralization oligomer, polycandelabrum ratio of the binder components, wt.%: Novolac phenol-formaldehyde oligomer is 60.5-76,5 Hexamethylenetetramine - 4,5-8,5 Complex of vanadium - 15,0-35,0 Complex of vanadium(V FFO) the General formula VO(C36H49O5N2) is a product of the interaction of metavanadate sodium and biomineralization oligomer. V-FFO is formed by extracting vanadium from waste process solutions processing blast furnace slag ferrous metallurgy and is a powder in which the vanadium is in a stable ligand shell nano state (Bukin C. I., Smirnov A., Resnick A. M. Extraction of vanadium (V) a nitrogen-containing oligomers, Izv. Higher education institutions. Non-ferrous metallurgy. 2000. 3, S. 16-22).

The use of V-FFA promotes the formation of evenly stitched spatial grid binder having high tensile strength before and after heating.

A binder was prepared as follows. The powders of the starting components are loaded into a paddle mixer in accordance with the formulation (table 1) and the mixture is stirred for 10 minutes

Example 1. 81 g of powdered phenol-formaldehyde oligomer, 6 g of hexamethylenetetramine and 13 g of the complex of vanadium was stirred 10 min at lopusna the mixer, then the resulting connection is aivali through a sieve with an aperture of 0.5 mm The samples were pressed at 160oC, a pressure of 10 MPa for 10 minutes

Tests for crushing the original samples and subjected to heat loading at 300oAnd the shutter speed of 30 min was carried out on a tensile testing machine um-5. The results of the tests are presented in table 1.

Examples 2-8 were performed as described above at a ratio of binder components, are shown in table 1.

Table 2 shows the compositions and properties of the compositions to obtain a press-powders designed for operation in conditions of high loads. Press powders are manufactured by us using a binder according to the invention (example 5, table 1) and the prototype (example 3). As the filler used powder utverzhdenii phenol-formaldehyde resin, Press-powders and standard samples of them were prepared by known techniques adopted in the production of phenolic plastic.

Use as a modifier of nanoscale complex of vanadium can improve the initial crushing strength of binding at the optimum content of components in 1.8-2 times. And after thermal loading 300oWith and exposure for 30 min 1.4 times.

When the content of the complex of vanadium is less than 15 wt.% nablyudaemost higher. This indicates the possibility of using such a binder to create products that work under normal conditions. When the content of the modifier above to 35.0 wt.% there is a very high activity of the complex interaction of vanadium with a phenol-formaldehyde oligomer, which impairs technological properties and reduces the mechanical strength of the binder.

The proposed binder can be used to create a phenolic press powders designed for operation in conditions of high stress, as evidenced by the data in table 2.

Claims

Binder for receiving the press-powders designed for operation in conditions of high loads containing powdered phenol-formaldehyde oligomer, hexamethylenetetramine and modifier, characterized in that as a modifier it contains a complex of vanadium, which is a product of the interaction of metavanadate sodium and biomineralization oligomer obtained by extracting vanadium from waste process solutions of slag processing of ferrous metallurgy, in the following ratio of the binder components, wt. %:
Novolac finalform the

 

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