Starch-grafted waterborne polyurethane sand fixing agent and preparation method thereof

A water-based polyurethane and starch grafting technology, which is applied in chemical instruments and methods, organic fertilizers, fertilizer mixtures, etc., can solve the problems of environmental pollution, lack of nutrients needed for plant growth, poor safety, etc., and achieve low cost and good application value and promotion prospects, the effect of using safety

Active Publication Date: 2012-06-20
江苏瑞丰科技实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a degradable, non-toxic, non-polluting, N, P,

Method used

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  • Starch-grafted waterborne polyurethane sand fixing agent and preparation method thereof
  • Starch-grafted waterborne polyurethane sand fixing agent and preparation method thereof
  • Starch-grafted waterborne polyurethane sand fixing agent and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0031] Example 1

[0032] In a reactor equipped with a stirrer, a thermometer and a reflux condenser, 80g of polyoxypropylene glycol (number average molecular weight is 2000), 13.5g of 1,6-hexamethylene diisocyanate, and 2.9g of dimethylolpropionic acid are added , Heat up to 80℃, add 0.04g of dibutyltin dilaurate, react for 4h under stirring, obtain polyurethane prepolymer with end groups mainly isocyanate groups and carboxyl content of 0.6-1.3%; then lower the temperature to 75℃ , Add 16g of soluble corn starch to the polyurethane prepolymer, continue the reaction at 75°C for 1h to obtain a prepolymer with a viscosity of 8000mPa.s, reduce the temperature to about 45°C, add 60g acetone to the prepolymer to reduce the viscosity to 3000mPa.s, add 1.23g of 25% ammonia water to neutralize the carboxylate in the prepolymer to form a salt, then add 165g of deionized water under high-speed shear to disperse, finally heat up and steam 34g of acetone to obtain milky white starch Graft a...

Example Embodiment

[0033] Example 2

[0034] In a reactor equipped with a stirrer, a thermometer, and a reflux condenser, 70 g of polyoxypropylene glycol (number average molecular weight is 2000), 10 g of polyether glycol (number average molecular weight of 1000), and 9 g of toluene diisocyanate are added And 8.1g isophorone diisocyanate, 2.8g dimethylolpropionic acid, stir and raise the temperature to 75°C, add 0.05g dibutyltin dilaurate, continue the stirring reaction for 4h, the end groups are mainly isocyanate groups, A polyurethane prepolymer with a carboxyl content of 0.6-1.3%; then, the temperature is lowered to 70°C, 8g of sweet potato starch is added to the polyurethane prepolymer, and the reaction is continued at 70°C for 1h to obtain the prepolymer, and the temperature is lowered to 40°C. Add 53g of acetone to the body to reduce the viscosity to 3000mPa.s, add 1.18g of 25% ammonia water to neutralize the carboxylate in the prepolymer to form a salt, then add 109g of deionized water under...

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Abstract

The invention discloses a starch-grafted waterborne polyurethane sand fixing agent and a preparation method thereof. The sand fixing agent is a starch-grafted waterborne polyurethane dispersion liquid of which the viscosity is 20-500 mPa.s at the temperature of 25 DEG C, the solid content is 30-45 percent by weight, the pH value is 6-8, and the storage stability is higher than six months; and the Shore hardness of a filmed dispersion liquid is 35-45. The sand fixing agent is obtained by undergoing a polymerization reaction on polyether polyol, diisocyanate, dimethylolpropionic acid, a neutralizing agent, starch, a latent solvent and a catalyst for forming a performed polymer and adding into deionized water for emulsifying. The starch-grafted waterborne polyurethane sand fixing agent has the advantages of degradability, nontoxicity, non-flammability, use safety, environmental friendliness, high nutrition and the like, and can be widely applied in the fields of agriculture and forestry as an environmentally-friendly nutritional sand fixing agent.

Description

technical field [0001] The invention relates to an environment-friendly nutritional sand-fixing agent, in particular to a starch-grafted water-based polyurethane sand-fixing agent and a preparation method thereof. Background technique [0002] The desert area has little precipitation and large evaporation. It is dry and rainless all year round, low humidity, high temperature, and large water evaporation. Plants cannot survive; in addition, the desert area is strong in wind, loose sand and easy to flow, and the newly planted seedlings cannot effectively grow. Roots are fixed, and the survival rate of plants is extremely low, resulting in high costs and long cycles for desert control. Therefore, first of all, sand must be fixed to minimize the flow of the desert, naturally maintain the original water content of the desert, and reduce the alkalinity of the desert itself. The use of polymer chemical materials for sand control is more effective and stable than clay and common ch...

Claims

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Application Information

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IPC IPC(8): C09K17/32C09K17/52C09K101/00C09K103/00
Inventor 杜峰项尚林方显力潘志刚鲁钢
Owner 江苏瑞丰科技实业有限公司
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