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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, K nutritional components, etc. Advantages of Starch Grafted Waterborne Polyurethane Sand Fixing Agent

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

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Embodiment 1

[0032] In the reactor that stirrer, thermometer, reflux condenser are equipped with, add polyoxypropylene glycol (the number average molecular weight is 2000) 80g, 1,6-hexamethylene diisocyanate 13.5g, dimethylol propionic acid 2.9g , heated up to 80°C, added 0.04g of dibutyltin dilaurate, and reacted for 4 hours under stirring to obtain a polyurethane prepolymer whose terminal group is mainly isocyanate group and carboxyl group content is 0.6-1.3%; then cooled to 75°C , add 16g of soluble cornstarch to the polyurethane prepolymer, continue to react at 75°C for 1h to obtain a prepolymer with a viscosity of 8000mPa.s, cool down to about 45°C, add 60g of acetone to the prepolymer to reduce the viscosity to 3000mPa.s, add 1.23g of ammonia water with a concentration of 25% to neutralize the carboxylate in the prepolymer to form a salt, then add 165g of deionized water to disperse under high-speed shear, and finally heat up and steam 34g of acetone to obtain milky white starch Graf...

Embodiment 2

[0034] In the reactor equipped with stirrer, thermometer, reflux condenser, add polyoxypropylene glycol (number average molecular weight is 2000) 70g, polyether glycol (number average molecular weight is 1000) 10g, toluene diisocyanate 9g and 8.1 g of isophorone diisocyanate, 2.8 g of dimethylol propionic acid, stirred and heated to 75 ° C, added 0.05 g of dibutyltin dilaurate, and continued to stir for 4 hours to obtain terminal groups mainly composed of isocyanate groups. A polyurethane prepolymer with a carboxyl content of 0.6-1.3%; then cool down to 70°C, add 8g of sweet potato starch to the polyurethane prepolymer, continue to react at 70°C for 1 hour to obtain a prepolymer, cool down to 40°C, and add Add 53g of acetone in the body to reduce the viscosity to 3000mPa.s, add 1.18g of ammonia water with a concentration of 25% to neutralize the carboxylate in the prepolymer to form a salt, then add 109g of deionized water under high-speed shear to disperse, and heat up Steam ...

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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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