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Polyurethane-based ecological sand-fixing agent and preparation method thereof

An ecological sand-fixing, polyurethane-based technology, applied in chemical instruments and methods, applications, organic fertilizers, etc., can solve the problems of aging, oil reduction, poor anti-aging performance, etc., and achieve good high and low temperature climate adaptability and aging resistance, The performance adjustment is convenient and flexible, and the effect of good strength bearing capacity

Active Publication Date: 2011-10-26
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the use of petroleum products: poor anti-aging performance, organic substances and resins in them are easily damaged by oxygen, light, heat, moisture and microorganisms, oil content decreases, and this change gradually intensifies and causes its performance to deteriorate. As a result, the consolidated layer gradually becomes brittle, hard, and ages, and finally cracks and is eroded by wind
However, the strength of the air-dried layer is lower

Method used

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  • Polyurethane-based ecological sand-fixing agent and preparation method thereof
  • Polyurethane-based ecological sand-fixing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Adding 50g number-average molecular weight in the reaction vessel is polyoxypropylene glycol (PPG2000 for short) of 2000, 50g number-average molecular weight is 2000 polyoxyethylene glycol (abbreviated PEG2000), 20g number-average molecular weight is 1000 poly-ε - caprolactone diol and 200ml toluene, heated and stirred at 145°C, distilled under normal pressure, when the toluene is nearly evaporated to dryness, use vacuum distillation to completely remove the residual water and toluene in the system.

[0024] Cool down to room temperature, remove the decompression device, set up the reflux condenser, and feed N 2 , Reaction system oil seal. Add 20 g of toluene diisocyanate into the reaction vessel, heat and stir, control the temperature at 90° C., and react for 2 hours.

[0025] After the system was cooled to room temperature, 200 ml of ethyl acetate was added and stirred at room temperature for 1 h. Stop stirring, discharge the material, add sodium lauryl sulfate acco...

Embodiment 2

[0027] Adding 25g number average molecular weight is the polyoxypropylene glycol (PPG1000 for short) of 1000 in reaction vessel, the PEG1000 of 75g, 15g number average molecular weight is polyε-caprolactone glycol and 200ml toluene of 3000, heating and stirring, temperature is Distill at 130°C under normal pressure. When the toluene is nearly evaporated to dryness, use vacuum distillation instead to completely remove the residual water and toluene in the system.

[0028] Cool down to room temperature, remove the decompression device, set up the reflux condenser, and inject N 2 , Reaction system oil seal. Add 28.7g of toluene diisocyanate into the reaction vessel, heat and stir, control the temperature at 100°C, and react for 2h.

[0029]After the system was cooled to room temperature, 200 ml of ethyl acetate was added and stirred at room temperature for 1 h. Stop stirring, discharge the material, add sodium dodecylbenzene sulfonate accounting for 4% of the mass of the polyur...

Embodiment 3

[0031] Add 75g of polyoxypropylene diol (PPG3000 for short) with a number average molecular weight of 3000 in the reaction vessel, 15g of PEG2000, 22.5g of polylactic acid diol with a number average molecular weight of 1000 and 150ml of toluene, heat and stir, and the temperature is 135°C. Atmospheric distillation, when the toluene is nearly evaporated to dryness, use vacuum distillation to completely remove the residual water and toluene in the system.

[0032] Cool down to room temperature, remove the decompression device, set up the reflux condenser, and feed N 2 , Reaction system oil seal. Add 16.1 g of toluene diisocyanate into the reaction vessel, heat and stir, control the temperature at 95° C., and react for 2.5 hours.

[0033] After the system was cooled to room temperature, 150 ml of ethyl acetate was added and stirred at room temperature for 2 h. Stop stirring, discharge, add sodium lauryl sulfate accounting for 6% of the mass of the polyurethane prepolymer, and f...

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Abstract

The invention relates to a polyurethane-based ecological sand-fixing agent and a preparation method thereof. The sand-fixing agent comprises the following components: 25-29 parts of polyurethane prepolymer, 0.5-2.1 parts of dispersion stabilizer and 27-36 parts of solvent, wherein the polyurethane prepolymer is obtained by polycondensation reaction of polymer polyol and diisocyanate, the polymer polyol comprises polypropylene oxide diol, polyoxyethylene diol and easily-degradable polymer diol, the mass ratio of polypropylene oxide diol to polyoxyethylene diol is (1:3)-(5:1), and the easily-degradable polymer diol accounts for 13-23wt% of the polymer polyol; and the mass ratio of the polymer polyol to diisocyanate is (4:1)-(7:1). The preparation method comprises the following steps: controlling the temperature at 85-100 DEG C under nitrogen gas protection, allowing reaction between the polymer polyol and diisocyanate to obtain a polyurethane prepolymer, and homogeneously mixing the polyurethane prepolymer, the dispersion stabilizer and the solvent to obtain the polyurethane-based ecological sand-fixing agent.

Description

technical field [0001] The invention relates to a polyurethane type ecological sand-fixing agent and a preparation method thereof. Background technique [0002] In recent years, sandstorms, soil erosion, dust and other desertification problems that have become increasingly rampant have attracted great attention at home and abroad, and have become ecological and environmental problems that endanger the national ecological security. The direct economic losses caused by desertification to the country are as high as tens of billions of yuan every year, which seriously restricts society. economic development. Therefore, it is an urgent task to find effective means of dust prevention and sand fixation. Among various sand-fixing methods, the chemical sand-fixing method is particularly suitable for use in areas lacking engineering sand-fixing materials, harsh environments, scarce rainfall, and difficult to use biological sand-fixing technology due to its advantages of mechanized co...

Claims

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Application Information

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IPC IPC(8): C09K17/30
Inventor 谌东中施斌施泽华陈枫刘瑾顾凯沈征涛
Owner NANJING UNIV
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