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Method for preparing composite water-retaining agent by adopting plant straws

A technology of plant straw and water-retaining agent, which is applied in the preparation of superabsorbent resin materials and the field of compound water-retaining agent prepared by plant straw, which can solve the problems of environmental pollution and waste of resources, and achieve simple preparation method, convenient operation and good comprehensive performance Effect

Active Publication Date: 2010-12-15
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main treatment method of plant straw in rural areas is burning, which not only pollutes the environment, but also is a great waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Dissolve 3g of corn stalks in 50mL of distilled water, heat and stir at 95°C for 30min;

[0030] (2) Adjust the temperature to 65°C, add 0.01g of potassium persulfate as an initiator, and stir for 30 minutes;

[0031] (3) Add 4g of acrylamide, 1g of palygorskite clay and 0.1g of formaldehyde, and stir for 2h;

[0032] (4) Add 30mL of 1mol / L hydrochloric acid solution, heat up to 95°C, and saponify for 2h; the product is washed with aqueous methanol until pH=7;

[0033] (5) Put the product into an oven, dry at 70°C until constant weight, grind and pulverize, pass through a 40-mesh sieve, and store in a sealed and dry place.

[0034] Performance of water-retaining agent: placed in tap water for 24 hours, its water absorption rate is about 900 times its own weight; placed in 0.9% saline solution, its water absorption rate can reach 500 times its own weight; the water-retaining agent saturated after water absorption is placed in the air, At room temperature (25°C) for...

Embodiment 2

[0036] (1) Dissolve 4g of soybean stalks in 60mL of distilled water, heat and stir at 60°C for 15min;

[0037] (2) Adjust the temperature to 40°C, add 0.012g of potassium persulfate-ferrous sulfate as an initiator, and stir for 20 minutes;

[0038] (3) Add 12g of acrylamide, 2.6g of hydrotalcite and 0.08g of formaldehyde, and stir for 1h;

[0039] (4) Add 30mL of 1mol / L hydrochloric acid solution, heat up to 60°C, and saponify for 30min; the product is washed with aqueous methanol to pH=6;

[0040] (5) The product is put into an oven, dried at 40°C until constant weight, ground and pulverized, passed through a 40-mesh sieve, sealed and dried for storage.

[0041] Performance of water-retaining agent: placed in tap water for 24 hours, its water absorption rate is about 800 times its own weight, placed in 0.9% saline solution, its water absorption rate can reach 450 times its own weight; place the saturated resin in the air, at room temperature At 25°C for 60 days, its water r...

Embodiment 3

[0043] (1) Dissolve 1g of peanut shell straw in 8mL of distilled water, heat and stir at 50°C for 20min;

[0044] (2) Adjust the temperature to 40°C, add 0.016g of ammonium persulfate-sodium bisulfite as an initiator, and stir for 30 minutes;

[0045] (3) Add 10g of acrylamide, 0.6g of montmorillonite and 0.006g of N,N-methylenebisacrylamide, and stir for 2h;

[0046] (4) Add 30mL of 1mol / L hydrochloric acid solution, heat up to 65°C, and saponify for 1h; the product is washed with aqueous methanol until pH=5;

[0047] (5) The product is put into an oven, dried at 40°C until constant weight, ground and pulverized, passed through a 40-mesh sieve, sealed and dried for storage.

[0048] Performance of water-retaining agent: placed in tap water for 24 hours, its water absorption rate is about 850 times of its own weight; placed in 0.9% saline solution, its water absorption rate can reach 480 times of its own weight; the saturated resin is placed in the air, at room temperature A...

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Abstract

The invention provides a method for preparing a composite water-retaining agent by adopting plant straws, belonging to the technical field of high-polymer materials. In the invention, the biodegradable plant straws with wide sources and low prices are used as raw materials, and graft copolymerization is carried out on the plant straws and acrylamide, clay, and the like to obtain the composite water-retaining agent with good comprehensive performance, therefore, the cost of the water-retaining agent is effectively reduced, and a new path for the application of the plant straws is sought. Meanwhile, since the composite water-retaining agent also has higher gel strength and saline alkali tolerance, the service performance of the water-retaining agent is further improved, and the service life thereof is prolonged.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to the preparation of a superabsorbent resin material, in particular to a method for preparing a composite water-retaining agent by using plant straws. Background technique [0002] Water-retaining agent, also known as superabsorbent polymer (SAP for short), is a strong hydrophilic polymer containing hydrophilic groups and a three-dimensional space network structure. It is neither soluble in water nor in organic solvents. It has no stimulating effect on biological tissues and has excellent properties such as reusability. It is a new type of functional polymer material. Compared with traditional water-absorbent materials, superabsorbent resins have strong water absorption and can absorb water tens to thousands of times their own weight. Even under pressurized conditions, they are not easy to lose water or lose little water , can slowly release water for plant absorption and ...

Claims

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Application Information

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IPC IPC(8): C08L51/00C08L51/10C08F292/00C08F289/00
Inventor 雷自强王忠超张哲许剑武战翠常迎王荣方
Owner NORTHWEST NORMAL UNIVERSITY
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