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Irradition initiating process for preparing cationic starch

A cationic starch and radiation-induced technology, applied in the fields of papermaking and textile pulp, can solve the problems of high equipment process requirements, high production costs, and low reaction conversion rates, and achieve the effects of no pollution to the environment, low cost, and simple production processes

Inactive Publication Date: 2007-01-03
WUHAN TEXTILE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of a large amount of organic solvents, the organic solvent method has disadvantages such as high production costs, poor safety, and the need for large reactors.
The advantage of the dry process is that the cationic agent does not need to be refined, no anti-gelling agent is added, no post-treatment is required, and there is basically no three wastes. However, the reaction conversion rate of this method is low, because it is a solid-phase reaction, and the requirements for equipment and technology are relatively high.
The semi-dry method appeared after the wet method and dry method. This method still needs lye as a catalyst, and has defects in environmental pollution and product quality.

Method used

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  • Irradition initiating process for preparing cationic starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, in a 1000 milliliter beaker, add 285 grams of corn raw starch, the raw starch moisture content is 14%, take by weighing 15 grams of cationic etherification agent (2,3-epoxypropyltrimethylammonium bromide ) liquid is poured into the original starch, and the blend is fully stirred with a glass rod for 30 minutes, so that the mixture is fully and uniformly mixed to prepare a mixture of 5% etherifying agent by mass percentage; then the mixture is packed into a polyethylene self-sealing plastic bag , seal; place the plastic bag containing the mixture in 60 Co irradiation field ( 60 CO-γ-ray irradiation field) to irradiate, under aerobic conditions, control the irradiation dose to 5KGy; pour the irradiated blend into a sealed container, place it in a constant temperature oven at 140°C, and dry Dry for 2 hours, then cool at normal temperature, pulverize and sieve, pass through a 100-mesh sieve, and pack to obtain a heated gelatinized cationic starc...

Embodiment 2

[0020] In a 1000 ml beaker, add 285 grams of raw corn starch, the water content of the raw starch is 14%, take 15 grams of cationic etherification agent (2,3-epoxypropyltrimethylammonium chloride) liquid and pour into the original starch, and fully stir the blend with a glass rod for 30 minutes, so that the mixture is fully and uniformly mixed to prepare a mixture with a mass percentage of 5% etherifying agent content; then put the mixture into a polyethylene self-sealing plastic bag and seal it; Place the plastic bag containing the blend in 60 Irradiate in a Co irradiation field, and control the irradiation dose to 5KGy under aerobic conditions; pour the irradiated blend into a sealed container, place it in a constant temperature oven at 190°C, and dry it for 2 hours. Then it is cooled at normal temperature, crushed, sieved and packaged to obtain a cold water soluble cationic starch product. Degree of substitution DS = 0.025.

Embodiment 3

[0022] Take 291 grams of potato native starch with a water content of 13%, add 9 grams of 2,3-epoxypropyltrimethylammonium chloride cationic etherification agent, and stir well to obtain a mixture; place the mixture in 60 Irradiate in the Co irradiation field, initiate the reaction under aerobic conditions, and control the irradiation dose by controlling the irradiation time, so that the irradiation dose is 15KGy to obtain a blend; place the blend at 150 ° C Dry in an oven and stir to decompose the peroxide and fully react the free radicals. Finally, pulverize and pass through a 100-mesh sieve to obtain cationic starch with a degree of substitution of 0.014.

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Abstract

The irradiation initiation process of preparing cationic starch includes the following steps: 1. adding cationic etherifying agent into starch material via stirring to obtain mixture with the cationic etherifying agent adding amount being 1-100 wt% of starch; 2. irradiating the mixture in Co-60 irradiation field of irradiation dose 3-15 KGy to initiate reaction in the presence of oxygen to prepare blend; and 3. post-treatment of the blend through stoving at 130-150 deg.c or 180-200 deg.c inside stove, stirring, crushing and 100 mesh sieving to obtain the cationic starch product. The process is environment friendly, simple and low in cost.

Description

technical field [0001] The invention belongs to the preparation technology of modified starch used in the fields of papermaking, textile pulp and the like, and in particular relates to a method for preparing cationic starch induced by radiation. Background technique [0002] Cationic starch is a variety of organic amine compounds containing halogenated or epoxy groups, which are produced by etherification reaction with hydroxyl groups in starch molecules, which contain amino groups and have positive charges on nitrogen atoms. Starch ethers derivative. Because of its positive charge, cationic starch is easy to be closely combined with negatively charged fine fibers and fillers; cationic starch has low gelatinization temperature, high slurry stability, good film-forming property, and good affinity with fibers, so it is widely used It is widely used as a retention and drainage aid and strengthening agent in the wet end of papermaking, as well as a sizing agent for textile warp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/08D21H17/29D06M15/00
Inventor 王晓广汪三刚夏和舟张金木
Owner WUHAN TEXTILE UNIV
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