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Dust prevention and sand fixation method

A sand-fixing method and a sand-fixing agent technology are applied in the fields of botanical equipment and methods, horticulture, soil protection, etc., and can solve the problems of consolidation strength, environmental stability, moisture absorption and water retention, wind erosion resistance, low cost, and ecological environmental protection. Achieve good economic performance, strong practicability, and the effect of being conducive to vegetation growth

Inactive Publication Date: 2011-11-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also several curing agents in China, such as LD geosynthetics, polyvinyl alcohol (PVA) emulsion, and RY-1 sand-fixing agent, but most of these sand-fixing agents simply mix several polymers and fail to have good solidification at the same time. Knot strength, environmental stability, moisture absorption and water retention, wind erosion resistance, low cost and ecological environmental protection and other characteristics

Method used

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  • Dust prevention and sand fixation method
  • Dust prevention and sand fixation method
  • Dust prevention and sand fixation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 30g number-average molecular weight in reaction vessel and be the polyoxypropylene diol of 2000, 60g number-average molecular weight be the polyoxyethylene diol of 1000 and 27g number-average molecular weight be the polyε-caprolactone diol of 2000, remove water Treatment: under the condition of nitrogen protection, add 23.4 g of toluene diisocyanate into the reaction vessel, control the temperature at 85° C., and react for 2 hours.

[0020] After cooling, add 200ml of ethyl acetate to the reaction system, and stir at room temperature for 1.5h. After discharging, add sodium dodecylbenzene sulfonate accounting for 5% of the mass of the polyurethane prepolymer, and stir thoroughly to prepare a polyurethane type ecological sand-fixing agent, which is sealed and stored.

[0021] Unconfined compressive strength and shear tests were carried out on the sand-fixing agent prepared in this example.

[0022] (1) Unconfined compressive strength test

[0023] The unconfined com...

Embodiment 2

[0035] Put 340g (recorded as m0) of sand taken from the site into a tray with a size of 16cm×16cm×3cm, and compact it for sample preparation. Prepare sand-fixing agent dilutions with different concentrations and proportions according to Table 3, and spray evenly on the surface of sandy soil sample 1, and the spraying amount is 3L / m 2 , placed at room temperature for 24h.

[0036] Table 3 Proportion of dilution solution of polyurethane type ecological sand-fixing agent

[0037] Concentration (weight)%

0

0.5

1

1.5

2

3

5

Polyurethane prepolymer (g)

0

5

10

15

20

30

50

Solvent (g)

0

6.19

12.38

18.57

24.76

30.95

37.14

water (g)

1000

988.81

977.62

966.43

955.24

939.05

912.86

[0038] Such as figure 1 As shown, the sand sample 1 was placed on a slope frame with a slope of 30° to ca...

Embodiment 3

[0043] Spread fine sand evenly in a tray of 30cm×30cm×2cm, prepare sand-fixing agent dilutions with different concentrations and ratios according to Table 5, and spray evenly on the surface of the sand sample, and the spraying amount is 3L / m 2 , placed at room temperature for 24h.

[0044] Table 5 Proportion of dilution solution of polyurethane type ecological sand-fixing agent

[0045] Concentration (weight)%

0

0.5

1

1.5

2

3

Polyurethane prepolymer (g)

0

15

30

45

60

90

Solvent (g)

0

18.57

37.14

55.71

74.28

111.42

water (g)

3000

2966.43

2932.86

2899.29

2865.72

2798.58

[0046] Such as figure 2 As shown, the simulation box 11 is used to carry out the simulation test of wind erosion resistance. The tray 15 is put into the simulation box 11, the switch 13 is turned on, and the blower 12 with adjustab...

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Abstract

The invention relates to a dust prevention and sand fixation method. The method comprises the following steps: diluting a polyurethane type ecological sand-fixing agent with water, wherein the concentration by weight percent of a polyurethane prepolymer is 0.5-5%; and then spraying dilution solution of the sand-fixing agent onto sandy soil for forming a solidified layer on the surface layer of the sandy soil, wherein the active ingredient of the polyurethane type ecological sand-fixing agent is the polyurethane prepolymer, the polyurethane prepolymer is obtained by condensation polymerizationbetween a polymer polyol and a diisocyanate compound, the polymer polyol comprises polyoxypropylene diol, polyethyleneoxide diol and easily degradable polymer diol, the mass ratio of the polyoxypropylene diol to the polyethyleneoxide diol is 1:3-5:1 and the easily degradable polymer diol accounts for 13-23% of the total weight of the polymer polyol; and the mass ratio of the polymer polyol to thediisocyanate compound is 4:1-7:1, and the easily degradable polymer diol is epsilon-caprolactone, polylactic acid diol or a mixture of epsilon-caprolactone and polylactic acid diol in any proportion.

Description

technical field [0001] The invention relates to a dust-proof and sand-fixing method, which is suitable for slope ecological protection of soil slopes, prevention and control of water and soil loss, desertification control in sandstorm areas, and also suitable for dust prevention and control in cities, building construction, military camping and other places. Background technique [0002] With the development of society and economy, the impact of human engineering activities on the surface is increasing, resulting in a series of ecological environment damage, such as soil erosion, slope instability, dust and other ecological environmental problems. According to reports, the area of ​​soil erosion in my country exceeds 1.5×10 6 km 2 , more than five billion tons of soil are lost every year. As the country with the most advanced water and soil conservation technology in the world, the United States loses an average of 5,800kg of soil per mu per year, especially in sandy soil ...

Claims

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Application Information

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IPC IPC(8): E02D3/12A01G1/00
Inventor 施斌谌东中刘瑾顾凯沈征涛施泽华陈枫
Owner NANJING UNIV
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