CN1265061C - Soil coagulating agent and its preparation method and application in fixing sand - Google Patents
Soil coagulating agent and its preparation method and application in fixing sand Download PDFInfo
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- CN1265061C CN1265061C CN 03134609 CN03134609A CN1265061C CN 1265061 C CN1265061 C CN 1265061C CN 03134609 CN03134609 CN 03134609 CN 03134609 A CN03134609 A CN 03134609A CN 1265061 C CN1265061 C CN 1265061C
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- sand
- soil
- pva
- water
- glycerine
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Abstract
The present invention provides a soil coagulating agent which is composed of PVA, (NH2) 2CO, (NH4) 2SO4, glycerine and water. The soil coagulating agent has the making method that the water in a kettle is heated to 50 DEG C; the PVA is slowly added and stirred to make water temperature achieve 80 DEG C until the PVA dissolves completely; then, the (NH2) 2CO is added and stirred homogeneously; the (NH4) 2SO4 and an initiator are added, stirred, and cooled to a normal temperature state; after the glycerine is added and stirred homogeneously, the glycerine is placed stably for making the soil coagulating agent. Verified by a large amount of experiments, the soil coagulating agent is sprayed on a sand surface to form surface combined skin, has the advantages of preventing and fixing sand, stabilizing shifting sand, and adding ground roughness degree, and creates a favourable environment for germination and growth of psammophyte. Particularly, the shifting sand is ridged into a square sand barrier, and the present invention has a notable sand fixing effect.
Description
Technical field
The present invention relates to a kind of soil coagulant, its preparation method and it application in fixing the sand.
Technical background
The method of tackling quicksand has three kinds, and promptly vegetative sand control, mechanical sand barrier fix the sand and chemical sand-fixing.At present, at the railway of China's desert area, highway reaches in the sand damage control of farmland and is widely used preceding two kinds of methods of fixing the sand along the line.But also there is intrinsic limitation in these two kinds of methods.So-called chemical sand-fixing method is exactly in the method for drift sand surface sprinkling binding material with tackling quicksand, cuts off getting in touch of the grains of sand and wind, in a period of time, makes drift sand be fixed on the original place and plants various psammophytess, also is one of the valid approach of defending and controlling sand.
Summary of the invention
The object of the present invention is to provide a kind of soil coagulant.Its Main Ingredients and Appearance contains urea and PVA chemical materials and water and forms and a kind of colloid of formation.
Another object of the present invention is to provide the preparation method of soil coagulant
Further purpose of the present invention is the application of soil coagulant in fixing the sand, promptly utilize the own resource in desert, drift sand is piled into the trellis sand-protecting barrier, spray soil coagulant then,, make the smooth and stable fixed concave surface of the glued formation of sand of individual particle on the surface of sand-protecting barrier, this sand-protecting barrier not only can play buffer action, but also can increase the roughness on the face of land, and stablize underlying surface, be that the advantageous environment condition is created in sprouting, the growth of psammophytes.
Technical scheme of the present invention can be finished by following measure
A kind of soil coagulant is by 6%PVA, 0.6% (NH
2)
2CO, 0.12% (NH
4)
2SO
4, 0.08% glycerine, surplus be that water is formed.This soil coagulant can be prepared by following method: with the reactor heating, when water temperature in the still reaches 50 ℃, slowly add PVA continuously, start mixer simultaneously, when the interior water temperature of still reaches 80 ℃, all dissolve up to PVA; Slowly adding (NH then
2)
2CO stirs; Add (NH again
4)
2SO
4, stir a period of time after, be cooled to the normal temperature state, add and leave standstill after glycerine stirs, get final product water white soil coagulant.
A. soil coagulant physicochemical property
The physical state colloid
Appearance colorless is transparent
Solubility is water-soluble
PH value 6.02
B. its physicochemical characteristic is as follows:
(1) virgin rubber of concentration 6% can be used as glue and uses nontoxic, no flammability;
(2) colloid is net structure, and the back of condensing is water insoluble, and meeting water has ruckbildung, dry and hard back functional rehabilitation;
(3) water of available salinity dilutes allotment arbitrarily under the normal temperature state;
(4) be sprayed onto glued stratification behind the sandy soil surface, have weather-proof, water erosion ability, its compressive strength improves with the raising of curative concentration;
(5) ageing resistance has certain fertilizer efficiency more than 3 years after the decomposition.
The present invention compared with prior art, the advantage and the beneficial effect that have are:
1, makes full use of the husky resource of desert area, farthest embody the thinking of " gathering materials on the spot, " with husky sand control.Play the trellis sand-protecting barrier on the Shamian Island ridge, soil coagulant is a kind of powerful polymer, have unique infiltration, filling effect, include the polymer chain of netted intersection, can form network between the particulate matter, increase the cohesive force between the particle, form surface skining, fix the sand, the effect that dustproof and anti-water and soil runs off thereby have.
2, soil coagulant is nontoxic, no flammable, and polluted underground water is not upset the normal growth of plant, can not influence the acid-base value of soil yet.
Raw material can obtain from the commercial channel, and preparation is simple.The present invention compares with other sand control measure, is not subjected to materials limitations, suits measures to local conditions, the ridge rises every barrier, and labor intensive is few, and spraying operation is convenient, and wide coverage is a kind of preventing and fixing sand measure of effective change lattice barrier underlying surface character.
3, soil coagulant is sprayed onto the trellis sand-protecting barrier, infiltrates the sand bed gap, solidifies the back and forms one deck containment vessel at Shamian Island, separates the direct effect of air-flow to loose Shamian Island, reaches to prevent face of land wind erosion, the purpose of avoiding drift sand to move.
4, table 1 soil coagulant trellis sand-protecting barrier fixes the sand benefit relatively with comprehensive the sprinkling
As can be seen from Table 1, the roughness that is sprayed on the heap longitudinal dune is 9.12 times that spray comprehensively, and sand-protecting barrier is set on drift sand, drift sand is cut off, thereby longitudinal dune plays the purpose of defending and controlling sand to the moving condition of change stream.
5, table 2 same specification, different engineering fix the sand that measure is anti-fixes the sand ability relatively
It can also be seen that from table 2, come comparison from the degree that the sand of eroding buries, with the earthwork lattice best results of the straw checkerboard barrier of 1 * 1m and 2 * 2m, is the geotechnological grid of soil coagulant trellis sand-protecting barrier and 1.5 * 1.5m secondly; From to the coarse influence degree analysis of the wind speed and the face of land, the most obvious with geotechnological grid sand-protecting barrier effect, secondly be straw checkerboard barrier sand-protecting barrier and soil coagulant trellis sand-protecting barrier, comprehensively the above, in various engineering sand control measures, soil coagulant trellis sand-protecting barrier is no lack of the using value that it is arranged.
Below in conjunction with embodiment the present invention is described further again
During with 50 ℃ of the water of reactor 2500ml heating, slowly add 150gPVA continuously, start mixer simultaneously, when temperature in the kettle reaches 80 ℃, all dissolve up to PVA.The urea that slowly adds 15g then evenly stirs, and with PVA the hydramine condensation reaction takes place, and adds the sulfuric acid amine of 3g again, after stirring a period of time, is cooled to the normal temperature attitude, leaves standstill after the glycerine of adding 2g stirs.Just can obtain water white soil coagulant.
Experiment of the present invention is carried out at Chinese Academy of Sciences cold area arid region environment and Engineering research institute's wind1 tunnel laboratory, and wind-tunnel soil coagulant model and field inspection geotechnique sand-protecting barrier ratio are 1: 10.
Before the experiment, with the model sand table that is of a size of 99 * 44 * 4cm, packing Tengger desert dune sand in the dish, and to make specification at sand table be 10 * 10,15 * 15, the trellis sand-protecting barrier of 20 * 20cm, sand-protecting barrier hangs down wide 4cm, high 5cm, directly will dilute back concentration and be respectively 20%, 30%, 40% soil coagulant evenly is sprayed on the model sand table of trellis sand-protecting barrier, after the bonding course drying to be formed, place the model sand table at distance wind-tunnel inlet 10.0-11.0m place along the wind-tunnel center line, be respectively 10 in air velocity, 15,20, observe under the 24m/s situation, and read data automatically with instrument; Also write down the data of checking winds and fixing drifting sand with scales/electronic balance weighing.
Table 3 is that soil coagulant fixes the sand the test situation that layer anti-blown sand corrode
| The coagulating soil agent concentration | Fixed sand bed average thickness (mm) | Air velocity (m/s) | The stream duration (min) | Amount of drift sand (g) | Erosion condition | ||
| 10×10 (cm 2) | 15×15 (cm 2) | 20×20 (cm 2) | |||||
| 20％ | 2 | 20 | 10 | 14 | 3 | 3.5 | There is the wind erosion hole part |
| 20％ | 2 | 24 | 13 | 13 | 4 | 2 | Wind erosion is serious, and area over half is destroyed |
| 30％ | 2 | 24 | 13 | 46 | 10 | 4 | The surface does not have the wind erosion vestige |
| 40％ | 2 | 24 | 13 | 23 | 7 | 5 | The surface does not have the wind erosion vestige |
As can be seen from Table 3, be under the situation of 24m/s in air velocity, concentration is the lattice barrier that 30% soil coagulant is sprayed at 10 * 10cm, fixed sand bed anti-blown sand erosion effect the best.
Embodiment 2, and the soil coagulant preparation method is with embodiment 1.Concentration is respectively 30%, 40% soil coagulant evenly is sprayed on the model sand table of trellis sand-protecting barrier of 10 * 10cm, 15 * 15cm, be placed on 30-40 degree domatic the test situation of observation amount of drift sand
The domatic amount of drift sand test situation of table 4 30-40 degree
| The coagulating soil agent concentration | Air velocity (m/s) | The stream duration (min) | Amount of drift sand (g) | |
| 10×10(cm) | 15×15(cm) | |||
| 30％ | 24 | 13 | 12 | 23 |
| 40％ | 24 | 13 | 9 | 45 |
As can be seen from Table 4, on 30-40 degree domatic, soil coagulant corrodes at fixed sand bed anti-blown sand, adopts the lattice barrier of 15 * 15cm, can play good effect.
Embodiment 3, and the present invention adopts nature to soak into or soil coagulant compressive strength and shearing force are measured in fixed compacting
The soil coagulant preparation method is with embodiment 1.
1. naturally osmotic
In the cutting ring of three diameter 6.18cm, high 2cm and diameter 3.91cm, high 8cm sample preparation device, fill with sand, the drift sand proportion position 2.69-2.70 that test is adopted, distribution of particles 0.05-0.5mm, angle of internal friction 30-40 °, cohesive force 0-9.4kpa.With watering can respectively spray concentration be that 20%, 30%, 40% soil coagulant is in Shamian Island, naturally soak into husky sample, there is soil coagulant to ooze out until the cutting ring bottom, and then fill in sand, and make sand be higher than the cutting ring face, spray a little soil coagulant again, after solidifying, even specimen surface out, in cutting ring, take out sample, put as drying in oven.
2. fixed compacting
Be respectively that 20%, 30%, 40% the soil coagulant 267g and the sand of 161.3g * 6 mix with concentration, make husky sample humidity, the sand that stirs is put into cutting ring and sample preparation device, impact, make it to reach the maximal density state with ramming device.After waiting to condense, even specimen surface out, in cutting ring, take out sample, in drying in oven.
Adopt DW-1 strain-type unconfined compression apparatus and the electronic tetrad strain of DSJ-2 type direct shear apparatus mensuration soil coagulant sand-protecting barrier compressive strength and shearing force as shown in table 5 below:
Table 5 soil coagulant naturally osmotic and fixed compacting compressive strength, shearing force are relatively
| Method for making sample | Experimental technique | Soil is doubted knot agent content (%) | Normal pressure (Mpa) | Cohesive force (kpa) | Angle of internal friction (°) | ||||
| 50 | 100 | 200 | 300 | ||||||
| Naturally soak into | Cut 0.8 mm/ min soon | 20 | Density (g/cm 3) | 1.668 | 1.701 | 1.659 | 1.707 | 185.65 | 41.07 |
| Shearing resistance (kpa) | 206.6 | 318.0 | 327.2 | 458.0 | |||||
| 30 | Density (g/cm 3) | 1.711 | 1.703 | 1.725 | 1.785 | 219.48 | 43.93 | ||
| Shearing resistance (kpa) | 268.9 | 302.1 | 436.3 | 496.6 | |||||
| 40 | Density (g/cm 3) | 1.674 | 1.626 | 1.715 | 1.621 | 281.31 | 43.44 | ||
| Shearing resistance (kpa) | 309.5 | 385.4 | 499.9 | 545.9 | |||||
| Soil coagulant and sand mix and stir fixed compacting | 20 | Density (g/cm 3) | 1.582 | 1.564 | 1.585 | 1.583 | 87.07 | 39.07 | |
| Shearing resistance (kpa) | 122.5 | 159.2 | 280.5 | 313.8 | |||||
| Density (g/cm 3) | 1.606 | 1.618 | 1.616 | 1.615 | 99.51 | 32.30 | |||
| Shearing resistance (kpa) | 115.2 | 174.7 | 241.7 | 277.3 | |||||
| 30 | Density (g/cm 3) | 1.699 | 1.635 | 1.627 | 1.643 | 204.0 | 45.71 | ||
| Shearing resistance (kpa) | 266.5 | 307.7 | 379.0 | 529.5 | |||||
| Density (g/cm 3) | 1.571 | 1.593 | 1.605 | 1.599 | 147.11 | 43.96 | |||
| Shearing resistance (kpa) | 175.4 | 277.2 | 323.5 | 440.0 | |||||
| 40 | Density (g/cm 3) | 1.633 | 1.620 | 1.630 | 1.643 | 264.33 | 43.09 | ||
| Shearing resistance (kpa) | 328.7 | 336.9 | 449.4 | 550.4 | |||||
| Density (g/cm 3) | 1.680 | 1.671 | 1.650 | 1.659 | 204.73 | 39.85 | |||
| Shearing resistance (kpa) | 221.1 | 321.9 | 367.7 | 450.8 | |||||
As can be seen from Table 5, with soaking into method naturally, concentration is that density, shearing resistance, the angle of internal friction comprehensive benefit of 30% soil coagulant is better than other, and commercial value is arranged.
The item that soil coagulant should be noted in fixing the sand:
1, spray soil coagulant and be preferably in fine day, the Shamian Island temperature reaches 50-70 °, best results, and Yin Gaowen can promote the interlinkage and the curing of polymer.
2, soil coagulant is water base curing compound, can not walk on Shamian Island after the sprinkling, can not spray water in the above, must guard against the rainy day and sprays.
3, spraying machine is same day completion or when working continuously, with the clear water flushing, in order to avoid the damage facility are condensed in the dry back of glue.
Claims (3)
1, a kind of soil coagulant is by following quality per distribution ratio:
PVA 6%, (NH
2)
2CO 0.6%, (NH
4)
2SO
40.12%, glycerine 0.08% and surplus are that water is formed.
2, a kind of by 6%PVA, 0.6% (NH
2)
2CO, 0.12% (NH
4)
2SO
4, 0.08% glycerine and surplus be the preparation method of the soil coagulant formed of water, the steps include:
(1) with the reactor heating, when water temperature in the still reaches 50 ℃, slowly add PVA continuously, start mixer simultaneously, when water temperature reaches 80 ℃ in the still, all dissolve up to PVA;
(2) slowly add (NH
2)
2CO stirs;
(3) add (NH
4)
2SO
4Initator stirs a period of time;
(4) be cooled to the normal temperature state, add and leave standstill after glycerine stirs, can make water white soil coagulant.
3, a kind of method of preventing and fixing sand adopts soil coagulant as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03134609 CN1265061C (en) | 2003-09-03 | 2003-09-03 | Soil coagulating agent and its preparation method and application in fixing sand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03134609 CN1265061C (en) | 2003-09-03 | 2003-09-03 | Soil coagulating agent and its preparation method and application in fixing sand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1590654A CN1590654A (en) | 2005-03-09 |
| CN1265061C true CN1265061C (en) | 2006-07-19 |
Family
ID=34597171
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03134609 Expired - Fee Related CN1265061C (en) | 2003-09-03 | 2003-09-03 | Soil coagulating agent and its preparation method and application in fixing sand |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1265061C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591908B (en) * | 2008-05-29 | 2011-03-02 | 北京科净源科技股份有限公司 | Application method of multifunctional compound surface environment remediation agent |
-
2003
- 2003-09-03 CN CN 03134609 patent/CN1265061C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101591908B (en) * | 2008-05-29 | 2011-03-02 | 北京科净源科技股份有限公司 | Application method of multifunctional compound surface environment remediation agent |
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| Publication number | Publication date |
|---|---|
| CN1590654A (en) | 2005-03-09 |
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