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Method for preparing water-retaining agent by utilizing straws

A technology of water-retaining agent and straw, applied in the field of water-retaining agent, can solve the problems of immature industrial production, unindustrial production, short effective sustainability, etc., and achieve the effects of improving grafting reaction efficiency, reducing dosage, and strong effective sustainability.

Active Publication Date: 2012-10-10
甘肃圣大方舟马铃薯变性淀粉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above water-retaining agents all have good water absorption ratios, but there are still the following deficiencies in the promotion of the process to industrial production: ①. The ratio of acrylic acid to straw mass used in the preparation method is 8:1 or at least 6:1, due to the price of acrylic acid In recent years, with the rising oil price, excessive consumption of acrylic acid will increase the production cost; ②, the straw is chemically treated before preparing the water-retaining agent, which not only increases the production cost, causes environmental pollution, but also complicates the process; The water-retaining agent prepared by grafting is in the form of gel during the grafting reaction process, the viscosity is so high that it cannot be stirred, it cannot be carried out in the reaction tank, and cannot be applied to industrial production
[0006] At present, the industrial production of water-retaining agents is mainly based on synthetic series, high cost, short effective duration, low gel strength and non-degradability are the main factors that directly affect the wide application of water-retaining agents. Many, but industrial production is not yet mature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method steps of preparing water-retaining agent are as follows:

[0026] 1. After dedusting the straw, use the hay cutter to cut it into 2-5 cm pieces, and use the CNC vertical continuous

[0027] The steam explosion of the continuous steam explosion machine is under the condition that the material density is 150 Kg / m 3 , 1.8 atmospheres, pressure holding time 120 seconds steam explosion, after the steam explosion, the straw powder is added to the water and fully stirred and then press-filtered, and the filter residue is the straw powder after the steam explosion treatment;

[0028] 2. Slowly add 18Kg of acrylic acid to 21.67L of 30% sodium hydroxide solution in an ice-water bath, stir well and then cool to room temperature to obtain a sodium acrylate solution with a neutralization degree of 65%.

[0029] 3. Add 12Kg of steam-exploded straw powder to 80Kg of water to make slurry, mix evenly, raise the temperature to 90°C, gelatinize for 30 minutes, lower the temp...

Embodiment 2

[0032] The method steps of preparing water-retaining agent are as follows:

[0033] 1. After dedusting the straw, use a hay cutter to cut it into 2-5 cm pieces, and use a numerical control vertical continuous steam explosion machine for steam explosion. The condition is that the material density is 150 Kg / m 3 , 2.2 atmospheres, pressure holding time 90 seconds steam explosion, after the steam explosion, the straw powder is added to the water and fully stirred and then press-filtered, and the filter residue is the straw powder after the steam explosion treatment;

[0034] 2. Slowly add 36Kg of acrylic acid to 46.6L of 30% sodium hydroxide solution in an ice-water bath, stir well and then cool to room temperature to obtain a sodium acrylate solution with a neutralization degree of 70%;

[0035] 3. Add 12Kg of steam-exploded straw powder to 120Kg of water to make slurry, mix evenly, raise the temperature to 90°C, gelatinize for 30 minutes, lower the temperature to 70°C, slowly ...

Embodiment 3

[0038] The method steps of preparing water-retaining agent are as follows:

[0039] 1. After dedusting the straw, use a hay cutter to cut it into 2-5 cm pieces, and use a numerically controlled vertical continuous steam explosion machine for steam explosion. The condition is that the material density is 150 Kg / m 3 , 2.8 atmospheres, pressure holding time 60 seconds steam explosion, after the steam explosion, the straw powder is added to the water and fully stirred and then press-filtered, and the filter residue is the straw powder after the steam explosion treatment;

[0040] 2. Slowly add 24Kg of acrylic acid to 33.3L of 30% sodium hydroxide solution in an ice-water bath, stir well and then cool to room temperature to obtain a sodium acrylate solution with a neutralization degree of 75%;

[0041] 3. Add 12Kg of steam-exploded straw powder to 100Kg of water to make slurry, mix evenly, raise the temperature to 90°C, gelatinize for 30 minutes, lower the temperature to 80°C, slowly...

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Abstract

The invention discloses a method for preparing water-retaining agent by utilizing straws of farm crops. The method includes the steps as follows: after steam explosion on the straws of farm crops, adding water in straws and conducting stirring and filter pressing, wherein filter residue is straw powder material after steam explosion; adding water in the straw powder material after steam explosionfor sizing and pasting; after cooling temperature to reaction temperature, slowly adding sodium acrylate solution with 65-75% of neutralization degree, and mixing the mixture to uniform; adding initiator and cross-linking agent in sequence; and after graft copolymerization and crosslinking, obtaining graft cellulose, thus obtaining low-cost degradable water-retaining agent. On the basis that the activable hydroxy of straw cellulose after steam explosion is increased, the technology condition is optimized and the usage amount of acrylic acid is lowered; the preparation method is simple, the production cost of the water-retaining agent is greatly reduced, and industralized production can be realized; in addition, the prepared water-retaining agent is good in water-retaining effect, low in cost and degradable, thus being an environment-friendly material and having excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of water-retaining agents, and in particular relates to a method for preparing low-cost and degradable water-retaining agents by grafting crop straws with acrylic acid after steam explosion. Background technique [0002] Water-retaining agent is a new type of polymer with strong water absorption. It has the characteristics of water absorption, water retention, and effective persistence (water absorption—water release—drying—reabsorption). Therefore, it has been widely used in agriculture and gardens. , Construction, coatings, petrochemicals and sanitary materials, etc., especially in agriculture, it has become the fourth largest agrochemical after chemical fertilizers, pesticides and films. [0003] In recent years, the use of water-retaining agents to improve soil structure and increase crop water and fertilizer use efficiency is an important way of chemical water-saving technology. At present, there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02
Inventor 郝军元田映良袁明山吉启荣
Owner 甘肃圣大方舟马铃薯变性淀粉有限公司
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