SU1204594A1 - Raw mixture for porous aggregate - Google Patents

Description

The invention relates to compositions intended for the manufacture of a coarse aggregate, and can be used in the construction materials for lightweight thermal insulation structures and products.

The purpose of the invention is to increase the mechanical strength, reduce the cost of lowering the heat treatment temperature.

To compile raw materials for mixtures about the proposed solution, the main components are:

- liquid sodium glass with a density of 1.25-1.35

- waste from the production of primary acetate of the Kaunas artificial fiber plant, which is formed during the filtration process, as a result of clogging of filters. The waste is a liquid sour cream-like mass, which, after curing in the form of lumps, will be dumped. At this plant it forms about

120 t / g According to the invention, it is used in a natural liquid state scientific research institute, it does not wait for spontaneous curing. The average chemical composition of the waste is as follows, wt.%:

triacetylcellulose 20; methylene chloride 71; ethyl alcohol 8.4; other impurities of 0.6. It has valuable properties - it does not grind, does not transmit electricity, is water resistant, is corrosion-resistant, biologically inert;

- grinding waste of glass production of the Panevezhysky plant Ekranas, specific surface area on average 100, chemical composition, wt.%; SiOj 96.0; A1.0.0 2.28; ppt 0.79; other compounds (Na, Ca, Mg, Cr) 0.93.

The role of each component in the mixture is as follows. Liquid glass in this case is not so much a binder, as a pore-forming agent. Waste from the production of primary acetate is the main staple component, giving the product high strength and high water resistance, as well as other valuable properties. The silica component - grinding waste, which is a crystalline quartz and reinforcing the framework of hardening material, contribute to the growth of additional strength. The use of grinding waste in raw materials,

five

0

mixtures significantly reduce the cost of aggregate.

Hardening of the mixture occurs mainly due to spontaneously proceeding (without introducing initiators and catalysts) polycondensation reactions of triacetylcellulose, which is contained in the waste production of primary acetate, formed in the process of homogeneous cellulose acetylation.

The mixture preparation technology is as follows.

Make weight dosage of the components. Then grinding glass production wastes are introduced into the water glass and mixed for 5 min. The liquid waste from the production of primary acetate is added and mixed again to a homogeneous state. From the obtained mass, cylindrical pellets with a height and diameter of 20-10 mm are made by rolling, which are immediately (for no more than 30 minutes after preparation, in order to avoid premature curing) are subjected to thermal forming in an electric dryer with a duration of about 30 minutes. Then the samples are cooled.

Due to the uniform porisation of the granules, with the formation of closed porosity and a dense polymer shell, the water absorption of the granules is small, hence the water resistance and durability of such a filler are increased.

Examples of specific compositions of the raw material mixture and the physico-mechanical properties of the aggregate are listed in Table. 1 and 2.

Table 1

0

five

0

35

35

thirty

table 2

The obtained granules can be used as a filler in the manufacture of lightweight heat insulating concrete, in the production of plate heat insulating products and structures that are of high strength. Composed by M. Khitrova

Order 8487/23 Circulation 604 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

nosti, water resistance, fire resistance, durability. Conventional cementing agents can be used to bind such granules: lime, gypsum, romance cement, portland cement.

Example. Prepared granules are used as filler in the amount of 70 wt.%, And in

the quality of the visitor is Portland cement 400 of the 400 grade cement plant in Almaty. At the same time, first portland cement is water shut (, 5), then aggregate granules are introduced

and stirred for 15-20 minutes until homogeneous mass. The resulting mass is laid by plastic casting in a metal form with a short (1 min) vibrating. Hardening is subjected to steaming in the chamber at the mode of 3 + 8 + 2 hours.

Technical properties of heat insulating plates:

Volumetric mass, kg / m 780-850 Compressive strength, MPa29-36

Water absorption,% 4.5-7.8 Heat transfer coefficient in a dry state at 25 ° C, kcal / mS-0.10-0.15

Claims (1)

RAW MATERIAL MIXTURE FOR POROUS FILLER, comprising liquid glass and a siliceous component, characterized in that, in order to increase mechanical strength, reduce the cost of lowering the heat treatment temperature, it contains glassy grinding waste and an additional primary acetate production waste as a siliceous component in the following ratio of components , wt.%: 25-35 Liquid glass Grinding waste glass production of leadership 30-40 β <0 Production waste primary acetate 30-40 ω