SU1234589A1 - Plugging composition - Google Patents

Description

The invention relates to the mining industry and can be used in the hardening of the new rock mass and soil to increase their stability.

The purpose of the invention is to reduce the amount of harmful gaseous excretions of phenol and formaldehyde during curing.

Example 1. A container with a volume of 150 l equipped with a mega puller is loaded with 52 kg of novolac phenol formaldehyde resin, resulting in 34.9 kg of phenol and 17.0 kg of 37% formalin as a result of the reaction (the mass ratio of phenol and formaldehyde is 100: 18 ) in the presence of 0.09 kg of hydrochloric acid in the form of a 7% aqueous solution. Then, with the stirrer in operation, 40 kg of benzene sulfonic acid and 10 kg of water are charged.

100 kg phenol of formaldehyde resin modified with diethylene glycol is loaded into a container with a volume of ZOO L equipped with a mixer. Then, while the mixer is running, load the mixture of components, prepared in the first container.

The resulting cement slurry. pumped through the well into the strengthened coal massif.

Example 2. In a tank with a volume of 150 l, equipped with a stirrer, 50 kg of novolac phenol-formaldehyde resin, obtained by the reaction of reaction 30, is loaded. 7 kg of phenol and 19 ,, 1 kg of 37% formalin (the mass ratio of phenol and formaldehyde is 100 : 23) in the presence of 0.08 kg of hydrochloric acid in the form of a 7% aqueous solution. 3ateM, while the mixer is running, load 42 kg of benzol sulfonic acid and 10 kg of water. The resulting mixture is used as a component of the cement composition for strengthening coal seams. Phenol-formaldehyde is used as the second component of cement composition: diethylene glycol modified resin

102 kg of the prepared mixture and 100 kg of phenol-formaldehyde resin, modified with dystiglycol, are fed from the tanks through separate pipelines. The components are mixed in a mixer installed in front of the well, and then the composition is injected through a well into a strengthened coal seam.

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Example 3. In a container with a volume of 1.50 l, equipped with a stirrer, load 45 kg. Novolac resin obtained by the reaction of 26.7 kg

5 phenol. And 18.1 kg of 37% formalin (mass ratio of phenol and formaldehy, ca 100: 25) in the presence of 0.08 kg of hydrochloric acid in the form of a 7% aqueous solution. Then when

10 working mixers load 45 kg of benzenesulfonic acid and 12 kg of water.

The resulting mixture is used as a component of cement composition. The second component of the cement composition is phenol-formaldehyde resin, which has been identified with disulfide glycol. 97 kg of prepared mixture and 100 kg of phenol-formaldehyde resin:

20 „modified diethylene glycol, served from tanks through separate pipelines. The components are mixed in a mixer installed before

well, and then the composition of the injection

through a well into a coal bed.

As a Novolac resin, a condensation product of phenol and formaldehyde is used, which is obtained according to the technology of production. Phenolfor-Maldehyde resin brand SF-010 (GOST 18S94--80) to the vacuum stage. The drying step is excluded in order to obtain a low viscosity mixture of novolac resin and benzenesulfonic acid.

The effect of the ratio of phenol and formaldehyde in the preparation of the Novolac resin on the amount of phenol and formaldehyde released during curing of the cement composition of Example 1 is shown in Table. one.

Table 1

y 55

The use of phenol-formaldehyde resin modified with diethylene glycol, novolac resin, benzenesulfonic acid and water in the indicated ratios allows the hardening of the cement slurry with the minimum amount of absorbed phenol and formaldehyde. The increase in the number of Novolac resin more than 52 mach. leads to an increase in the number of exogenous phenol, reduces the strength of the cured samples. Content Novolac resin less than 45 May, h increases quantity

Prototype 100,

sixteen

 Examples 4-5 are comparative beyond the stated ratios; The maximum permissible concentration in the air of the working area of phenol is 0.3 kg / m, formaldehyde is 0.05 kg / m.

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formaldehyde released during curing. The introduction of benzenesulfonic acid in an amount of less than 40 May, h, slows down the curing process, and 5 more than 45 May, h. reduces the strength of the cured samples; the presence of water in an amount of less than 10 wt.h. , increases ekoreet curing, and more than 12 May, h. reduces strength

10 cured samples.

In tab. Figures 2 and 3 show the tours and properties of the developed and known cement slurry.

table 2

6.71

2.62 4.81

2.12 1.42 0.265

Density, g / cm2 1.23 1.22 1.23 1.21

Viscosity, mPa-s (at 15 ° C)

Gel time, min (at 15 ° С)

Gluing strength for tearing (by coal after 1 day), MPa

Compressive strength (after 1 day), MPa

Linear shrinkage

(after 30 days),%

 The flowability index was estimated by the viscosity of the composition at the time of preparation.

 The setting time was assessed by the gel time of the composition.

It can be seen from the table that during the curing of the proposed tampon solution, 4 to 20 times less phenol and 4 to 7 times less formaldehyde are released, while other properties do not deteriorate.

The decrease in the amount of free phenol and formaldehyde released during curing is apparently due to the fact that when phenol-formaldehyde is mixed, it is modified. Table 3

202

218,257

87

100 118

0.97 1.12 1.02

34.2 32.4 36.6

3.5 3.2 2.8

Noah (resol) and novolac resins decrease the concentration of reactive methylol groups, which leads to the predominance of the reaction of interaction with free phenol over the reaction of

them with each other. In this case, predominantly stable methyl bonds are formed instead of methylene ether (as in the well-known material), which are able to pass into methylene with formaldehyde release.

Claims (1)

TUMPING SOLUTION, including phenol-formaldehyde resin, modified with diethylene glycol, benzenesulfonic acid and water, characterized in that, in order to reduce the amount of harmful gaseous emissions of phenol and formaldehyde during curing, the solution additionally contains novolac phenol-formaldehyde resin in the following ratio of components: Fe formalformaldehyde resin modified with diethylene glycol 100 Novolac Resin 45-52 Benzenesulfonic acid 40-45 Water 10-12 1234589 2